1706 lines
51 KiB
C
1706 lines
51 KiB
C
/*
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* tkCanvArc.c --
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*
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* This file implements arc items for canvas widgets.
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*
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* Copyright (c) 1992-1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef lint
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static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkCanvArc.c,v 1.16 93/09/15 08:19:59 ouster Exp $ SPRITE (Berkeley)";
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#endif
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#include <stdio.h>
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#include "tkConfig.h"
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#include "tkInt.h"
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#include "tkCanvas.h"
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/*
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* The structure below defines the record for each arc item.
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*/
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typedef struct ArcItem {
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Tk_Item header; /* Generic stuff that's the same for all
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* types. MUST BE FIRST IN STRUCTURE. */
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double bbox[4]; /* Coordinates (x1, y1, x2, y2) of bounding
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* box for oval of which arc is a piece. */
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double start; /* Angle at which arc begins, in degrees
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* between 0 and 360. */
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double extent; /* Extent of arc (angular distance from
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* start to end of arc) in degrees between
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* -360 and 360. */
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double *outlinePtr; /* Points to (x,y) coordinates for points
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* that define one or two closed polygons
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* representing the portion of the outline
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* that isn't part of the arc (the V-shape
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* for a pie slice or a line-like segment
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* for a chord). Malloc'ed. */
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int numOutlinePoints; /* Number of points at outlinePtr. Zero
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* means no space allocated. */
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int width; /* Width of outline (in pixels). */
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XColor *outlineColor; /* Color for outline. NULL means don't
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* draw outline. */
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XColor *fillColor; /* Color for filling arc (used for drawing
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* outline too when style is "arc"). NULL
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* means don't fill arc. */
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Pixmap fillStipple; /* Stipple bitmap for filling item. */
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Tk_Uid style; /* How to draw arc: arc, chord, or pieslice. */
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GC outlineGC; /* Graphics context for outline. */
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GC fillGC; /* Graphics context for filling item. */
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GC *stippleGCPtr; /* If not NULL, points to a GC (either
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* outlineGC or fillGC) containing a stipple
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* offset that must be adjusted on each
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* redisplay. */
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double center1[2]; /* Coordinates of center of arc outline at
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* start (see ComputeArcOutline). */
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double center2[2]; /* Coordinates of center of arc outline at
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* start+extent (see ComputeArcOutline). */
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} ArcItem;
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/*
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* The definitions below define the sizes of the polygons used to
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* display outline information for various styles of arcs:
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*/
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#define CHORD_OUTLINE_PTS 7
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#define PIE_OUTLINE1_PTS 6
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#define PIE_OUTLINE2_PTS 7
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/*
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* Information used for parsing configuration specs:
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*/
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static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_DOUBLE, "-extent", (char *) NULL, (char *) NULL,
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"90", Tk_Offset(ArcItem, extent), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(ArcItem, fillColor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
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"black", Tk_Offset(ArcItem, outlineColor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_DOUBLE, "-start", (char *) NULL, (char *) NULL,
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"0", Tk_Offset(ArcItem, start), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(ArcItem, fillStipple), TK_CONFIG_NULL_OK},
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{TK_CONFIG_UID, "-style", (char *) NULL, (char *) NULL,
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"pieslice", Tk_Offset(ArcItem, style), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
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(char *) NULL, 0, TK_CONFIG_NULL_OK, &tkCanvasTagsOption},
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{TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
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"1", Tk_Offset(ArcItem, width), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) NULL, 0, 0}
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};
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/*
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* Prototypes for procedures defined in this file:
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*/
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static int ArcCoords _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int argc, char **argv));
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static int AngleInRange _ANSI_ARGS_((double x, double y,
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double start, double extent));
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static int ArcToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *rectPtr));
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static double ArcToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *coordPtr));
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static int ArcToPostscript _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Tk_PostscriptInfo *psInfoPtr));
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static void ComputeArcBbox _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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ArcItem *arcPtr));
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static void ComputeArcOutline _ANSI_ARGS_((ArcItem *arcPtr));
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static int ConfigureArc _ANSI_ARGS_((
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Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int argc,
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char **argv, int flags));
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static int CreateArc _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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struct Tk_Item *itemPtr, int argc, char **argv));
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static void DeleteArc _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr));
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static void DisplayArc _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Drawable dst));
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static int HorizLineToArc _ANSI_ARGS_((double x1, double x2,
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double y, double rx, double ry,
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double start, double extent));
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static void ScaleArc _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double originX, double originY,
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double scaleX, double scaleY));
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static void TranslateArc _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double deltaX, double deltaY));
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static int VertLineToArc _ANSI_ARGS_((double x, double y1,
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double y2, double rx, double ry,
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double start, double extent));
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/*
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* The structures below defines the arc item types by means of procedures
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* that can be invoked by generic item code.
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*/
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Tk_ItemType TkArcType = {
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"arc", /* name */
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sizeof(ArcItem), /* itemSize */
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CreateArc, /* createProc */
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configSpecs, /* configSpecs */
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ConfigureArc, /* configureProc */
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ArcCoords, /* coordProc */
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DeleteArc, /* deleteProc */
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DisplayArc, /* displayProc */
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0, /* alwaysRedraw */
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ArcToPoint, /* pointProc */
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ArcToArea, /* areaProc */
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ArcToPostscript, /* postscriptProc */
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ScaleArc, /* scaleProc */
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TranslateArc, /* translateProc */
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(Tk_ItemIndexProc *) NULL, /* indexProc */
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(Tk_ItemCursorProc *) NULL, /* icursorProc */
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(Tk_ItemSelectionProc *) NULL, /* selectionProc */
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(Tk_ItemInsertProc *) NULL, /* insertProc */
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(Tk_ItemDCharsProc *) NULL, /* dTextProc */
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(Tk_ItemType *) NULL /* nextPtr */
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};
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#ifndef PI
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# define PI 3.14159265358979323846
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#endif
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/*
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* The uid's below comprise the legal values for the "-style"
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* option for arcs.
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*/
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static Tk_Uid arcUid = NULL;
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static Tk_Uid chordUid = NULL;
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static Tk_Uid pieSliceUid = NULL;
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/*
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*--------------------------------------------------------------
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*
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* CreateArc --
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*
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* This procedure is invoked to create a new arc item in
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* a canvas.
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*
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* Results:
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* A standard Tcl return value. If an error occurred in
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* creating the item, then an error message is left in
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* canvasPtr->interp->result; in this case itemPtr is
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* left uninitialized, so it can be safely freed by the
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* caller.
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*
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* Side effects:
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* A new arc item is created.
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*
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*--------------------------------------------------------------
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*/
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static int
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CreateArc(canvasPtr, itemPtr, argc, argv)
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register Tk_Canvas *canvasPtr; /* Canvas to hold new item. */
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Tk_Item *itemPtr; /* Record to hold new item; header
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* has been initialized by caller. */
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int argc; /* Number of arguments in argv. */
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char **argv; /* Arguments describing arc. */
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{
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register ArcItem *arcPtr = (ArcItem *) itemPtr;
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if (argc < 4) {
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Tcl_AppendResult(canvasPtr->interp, "wrong # args: should be \"",
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Tk_PathName(canvasPtr->tkwin), "\" create ",
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itemPtr->typePtr->name, " x1 y1 x2 y2 ?options?",
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(char *) NULL);
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return TCL_ERROR;
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}
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/*
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* Carry out once-only initialization.
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*/
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if (arcUid == NULL) {
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arcUid = Tk_GetUid("arc");
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chordUid = Tk_GetUid("chord");
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pieSliceUid = Tk_GetUid("pieslice");
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}
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/*
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* Carry out initialization that is needed in order to clean
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* up after errors during the the remainder of this procedure.
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*/
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arcPtr->start = 0;
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arcPtr->extent = 90;
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arcPtr->outlinePtr = NULL;
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arcPtr->numOutlinePoints = 0;
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arcPtr->width = 1;
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arcPtr->outlineColor = NULL;
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arcPtr->fillColor = NULL;
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arcPtr->fillStipple = None;
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arcPtr->style = pieSliceUid;
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arcPtr->outlineGC = None;
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arcPtr->fillGC = None;
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arcPtr->stippleGCPtr = NULL;
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/*
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* Process the arguments to fill in the item record.
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*/
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if ((TkGetCanvasCoord(canvasPtr, argv[0], &arcPtr->bbox[0]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[1],
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&arcPtr->bbox[1]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[2],
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&arcPtr->bbox[2]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[3],
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&arcPtr->bbox[3]) != TCL_OK)) {
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return TCL_ERROR;
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}
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if (ConfigureArc(canvasPtr, itemPtr, argc-4, argv+4, 0) != TCL_OK) {
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DeleteArc(canvasPtr, itemPtr);
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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*--------------------------------------------------------------
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*
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* ArcCoords --
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*
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* This procedure is invoked to process the "coords" widget
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* command on arcs. See the user documentation for details
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* on what it does.
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*
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* Results:
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* Returns TCL_OK or TCL_ERROR, and sets canvasPtr->interp->result.
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*
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* Side effects:
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* The coordinates for the given item may be changed.
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*
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*--------------------------------------------------------------
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*/
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static int
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ArcCoords(canvasPtr, itemPtr, argc, argv)
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register Tk_Canvas *canvasPtr; /* Canvas containing item. */
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Tk_Item *itemPtr; /* Item whose coordinates are to be
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* read or modified. */
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int argc; /* Number of coordinates supplied in
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* argv. */
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char **argv; /* Array of coordinates: x1, y1,
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* x2, y2, ... */
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{
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register ArcItem *arcPtr = (ArcItem *) itemPtr;
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char c0[TCL_DOUBLE_SPACE], c1[TCL_DOUBLE_SPACE];
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char c2[TCL_DOUBLE_SPACE], c3[TCL_DOUBLE_SPACE];
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if (argc == 0) {
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Tcl_PrintDouble(canvasPtr->interp, arcPtr->bbox[0], c0);
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Tcl_PrintDouble(canvasPtr->interp, arcPtr->bbox[1], c1);
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Tcl_PrintDouble(canvasPtr->interp, arcPtr->bbox[2], c2);
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Tcl_PrintDouble(canvasPtr->interp, arcPtr->bbox[3], c3);
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Tcl_AppendResult(canvasPtr->interp, c0, " ", c1, " ",
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c2, " ", c3, (char *) NULL);
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} else if (argc == 4) {
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if ((TkGetCanvasCoord(canvasPtr, argv[0],
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&arcPtr->bbox[0]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[1],
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&arcPtr->bbox[1]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[2],
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&arcPtr->bbox[2]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[3],
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&arcPtr->bbox[3]) != TCL_OK)) {
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return TCL_ERROR;
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}
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ComputeArcBbox(canvasPtr, arcPtr);
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} else {
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sprintf(canvasPtr->interp->result,
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"wrong # coordinates: expected 0 or 4, got %d",
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argc);
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return TCL_ERROR;
|
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}
|
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return TCL_OK;
|
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}
|
||
|
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/*
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*--------------------------------------------------------------
|
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*
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* ConfigureArc --
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*
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* This procedure is invoked to configure various aspects
|
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* of a arc item, such as its outline and fill colors.
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*
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* Results:
|
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* A standard Tcl result code. If an error occurs, then
|
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* an error message is left in canvasPtr->interp->result.
|
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*
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* Side effects:
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* Configuration information, such as colors and stipple
|
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* patterns, may be set for itemPtr.
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*
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*--------------------------------------------------------------
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*/
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static int
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ConfigureArc(canvasPtr, itemPtr, argc, argv, flags)
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Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */
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Tk_Item *itemPtr; /* Arc item to reconfigure. */
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int argc; /* Number of elements in argv. */
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char **argv; /* Arguments describing things to configure. */
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int flags; /* Flags to pass to Tk_ConfigureWidget. */
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{
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register ArcItem *arcPtr = (ArcItem *) itemPtr;
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XGCValues gcValues;
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GC newGC;
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unsigned long mask;
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int i;
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if (Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
|
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configSpecs, argc, argv, (char *) arcPtr, flags) != TCL_OK) {
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return TCL_ERROR;
|
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}
|
||
|
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/*
|
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* A few of the options require additional processing, such as
|
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* style and graphics contexts.
|
||
*/
|
||
|
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i = arcPtr->start/360.0;
|
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arcPtr->start -= i*360.0;
|
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if (arcPtr->start < 0) {
|
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arcPtr->start += 360.0;
|
||
}
|
||
i = arcPtr->extent/360.0;
|
||
arcPtr->extent -= i*360.0;
|
||
|
||
if ((arcPtr->style != arcUid) && (arcPtr->style != chordUid)
|
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&& (arcPtr->style != pieSliceUid)) {
|
||
Tcl_AppendResult(canvasPtr->interp, "bad -style option \"",
|
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arcPtr->style, "\": must be arc, chord, or pieslice",
|
||
(char *) NULL);
|
||
arcPtr->style = pieSliceUid;
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
if (arcPtr->width < 0) {
|
||
arcPtr->width = 1;
|
||
}
|
||
arcPtr->stippleGCPtr = NULL;
|
||
if (arcPtr->style == arcUid) {
|
||
if (arcPtr->fillColor == NULL) {
|
||
newGC = None;
|
||
} else {
|
||
gcValues.foreground = arcPtr->fillColor->pixel;
|
||
gcValues.cap_style = CapButt;
|
||
gcValues.line_width = arcPtr->width;
|
||
mask = GCForeground|GCCapStyle|GCLineWidth;
|
||
if (arcPtr->fillStipple != None) {
|
||
gcValues.stipple = arcPtr->fillStipple;
|
||
gcValues.fill_style = FillStippled;
|
||
mask |= GCStipple|GCFillStyle;
|
||
arcPtr->stippleGCPtr = &arcPtr->outlineGC;
|
||
}
|
||
newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
|
||
}
|
||
} else if (arcPtr->outlineColor == NULL) {
|
||
newGC = None;
|
||
} else {
|
||
gcValues.foreground = arcPtr->outlineColor->pixel;
|
||
gcValues.cap_style = CapButt;
|
||
gcValues.line_width = arcPtr->width;
|
||
mask = GCForeground|GCCapStyle|GCLineWidth;
|
||
newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
|
||
}
|
||
if (arcPtr->outlineGC != None) {
|
||
Tk_FreeGC(canvasPtr->display, arcPtr->outlineGC);
|
||
}
|
||
arcPtr->outlineGC = newGC;
|
||
|
||
if ((arcPtr->fillColor == NULL) || (arcPtr->style == arcUid)) {
|
||
newGC = None;
|
||
} else {
|
||
gcValues.foreground = arcPtr->fillColor->pixel;
|
||
if (arcPtr->style == chordUid) {
|
||
gcValues.arc_mode = ArcChord;
|
||
} else {
|
||
gcValues.arc_mode = ArcPieSlice;
|
||
}
|
||
mask = GCForeground|GCArcMode;
|
||
if (arcPtr->fillStipple != None) {
|
||
gcValues.stipple = arcPtr->fillStipple;
|
||
gcValues.fill_style = FillStippled;
|
||
mask |= GCStipple|GCFillStyle;
|
||
arcPtr->stippleGCPtr = &arcPtr->fillGC;
|
||
}
|
||
newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
|
||
}
|
||
if (arcPtr->fillGC != None) {
|
||
Tk_FreeGC(canvasPtr->display, arcPtr->fillGC);
|
||
}
|
||
arcPtr->fillGC = newGC;
|
||
|
||
ComputeArcBbox(canvasPtr, arcPtr);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DeleteArc --
|
||
*
|
||
* This procedure is called to clean up the data structure
|
||
* associated with a arc item.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Resources associated with itemPtr are released.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DeleteArc(canvasPtr, itemPtr)
|
||
Tk_Canvas *canvasPtr; /* Info about overall canvas. */
|
||
Tk_Item *itemPtr; /* Item that is being deleted. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
|
||
if (arcPtr->numOutlinePoints != 0) {
|
||
ckfree((char *) arcPtr->outlinePtr);
|
||
}
|
||
if (arcPtr->outlineColor != NULL) {
|
||
Tk_FreeColor(arcPtr->outlineColor);
|
||
}
|
||
if (arcPtr->fillColor != NULL) {
|
||
Tk_FreeColor(arcPtr->fillColor);
|
||
}
|
||
if (arcPtr->fillStipple != None) {
|
||
Tk_FreeBitmap(canvasPtr->display, arcPtr->fillStipple);
|
||
}
|
||
if (arcPtr->outlineGC != None) {
|
||
Tk_FreeGC(canvasPtr->display, arcPtr->outlineGC);
|
||
}
|
||
if (arcPtr->fillGC != None) {
|
||
Tk_FreeGC(canvasPtr->display, arcPtr->fillGC);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ComputeArcBbox --
|
||
*
|
||
* This procedure is invoked to compute the bounding box of
|
||
* all the pixels that may be drawn as part of an arc.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The fields x1, y1, x2, and y2 are updated in the header
|
||
* for itemPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
ComputeArcBbox(canvasPtr, arcPtr)
|
||
register Tk_Canvas *canvasPtr; /* Canvas that contains item. */
|
||
register ArcItem *arcPtr; /* Item whose bbox is to be
|
||
* recomputed. */
|
||
{
|
||
double tmp, center[2], point[2];
|
||
|
||
/*
|
||
* Make sure that the first coordinates are the lowest ones.
|
||
*/
|
||
|
||
if (arcPtr->bbox[1] > arcPtr->bbox[3]) {
|
||
double tmp;
|
||
tmp = arcPtr->bbox[3];
|
||
arcPtr->bbox[3] = arcPtr->bbox[1];
|
||
arcPtr->bbox[1] = tmp;
|
||
}
|
||
if (arcPtr->bbox[0] > arcPtr->bbox[2]) {
|
||
double tmp;
|
||
tmp = arcPtr->bbox[2];
|
||
arcPtr->bbox[2] = arcPtr->bbox[0];
|
||
arcPtr->bbox[0] = tmp;
|
||
}
|
||
|
||
ComputeArcOutline(arcPtr);
|
||
|
||
/*
|
||
* To compute the bounding box, start with the the bbox formed
|
||
* by the two endpoints of the arc. Then add in the center of
|
||
* the arc's oval (if relevant) and the 3-o'clock, 6-o'clock,
|
||
* 9-o'clock, and 12-o'clock positions, if they are relevant.
|
||
*/
|
||
|
||
arcPtr->header.x1 = arcPtr->header.x2 = arcPtr->center1[0];
|
||
arcPtr->header.y1 = arcPtr->header.y2 = arcPtr->center1[1];
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) arcPtr, arcPtr->center2);
|
||
center[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2;
|
||
center[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2;
|
||
if (arcPtr->style != arcUid) {
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) arcPtr, center);
|
||
}
|
||
|
||
tmp = -arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
point[0] = arcPtr->bbox[2];
|
||
point[1] = center[1];
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) arcPtr, point);
|
||
}
|
||
tmp = 90.0 - arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
point[0] = center[0];
|
||
point[1] = arcPtr->bbox[1];
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) arcPtr, point);
|
||
}
|
||
tmp = 180.0 - arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
point[0] = arcPtr->bbox[0];
|
||
point[1] = center[1];
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) arcPtr, point);
|
||
}
|
||
tmp = 270.0 - arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
point[0] = center[0];
|
||
point[1] = arcPtr->bbox[3];
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) arcPtr, point);
|
||
}
|
||
|
||
/*
|
||
* Lastly, expand by the width of the arc (if the arc's outline is
|
||
* being drawn) and add one extra pixel just for safety.
|
||
*/
|
||
|
||
if (arcPtr->outlineColor == NULL) {
|
||
tmp = 1;
|
||
} else {
|
||
tmp = (arcPtr->width + 1)/2 + 1;
|
||
}
|
||
arcPtr->header.x1 -= tmp;
|
||
arcPtr->header.y1 -= tmp;
|
||
arcPtr->header.x2 += tmp;
|
||
arcPtr->header.y2 += tmp;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DisplayArc --
|
||
*
|
||
* This procedure is invoked to draw an arc item in a given
|
||
* drawable.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* ItemPtr is drawn in drawable using the transformation
|
||
* information in canvasPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayArc(canvasPtr, itemPtr, drawable)
|
||
register Tk_Canvas *canvasPtr; /* Canvas that contains item. */
|
||
Tk_Item *itemPtr; /* Item to be displayed. */
|
||
Drawable drawable; /* Pixmap or window in which to draw
|
||
* item. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
Display *display = Tk_Display(canvasPtr->tkwin);
|
||
int x1, y1, x2, y2, start, extent;
|
||
|
||
/*
|
||
* Compute the screen coordinates of the bounding box for the item,
|
||
* plus integer values for the angles.
|
||
*/
|
||
|
||
x1 = SCREEN_X(canvasPtr, arcPtr->bbox[0]);
|
||
y1 = SCREEN_Y(canvasPtr, arcPtr->bbox[1]);
|
||
x2 = SCREEN_X(canvasPtr, arcPtr->bbox[2]);
|
||
y2 = SCREEN_Y(canvasPtr, arcPtr->bbox[3]);
|
||
if (x2 <= x1) {
|
||
x2 = x1+1;
|
||
}
|
||
if (y2 <= y1) {
|
||
y2 = y1+1;
|
||
}
|
||
start = (64*arcPtr->start) + 0.5;
|
||
extent = (64*arcPtr->extent) + 0.5;
|
||
|
||
/*
|
||
* If the arc is being filled with a stipple pattern, modify the
|
||
* stipple offset in the GC. Be sure to reset the offset when done,
|
||
* since the GC is supposed to be read-only.
|
||
*/
|
||
|
||
if (arcPtr->stippleGCPtr != NULL) {
|
||
XSetTSOrigin(display, *arcPtr->stippleGCPtr,
|
||
-canvasPtr->drawableXOrigin, -canvasPtr->drawableYOrigin);
|
||
}
|
||
|
||
/*
|
||
* Display filled arc first (if wanted), then outline. If the extent
|
||
* is zero then don't invoke XFillArc or XDrawArc, since this causes
|
||
* some window servers to crash and should be a no-op anyway.
|
||
*/
|
||
|
||
if ((arcPtr->fillGC != None) && (extent != 0)) {
|
||
XFillArc(display, drawable, arcPtr->fillGC, x1, y1, (x2-x1),
|
||
(y2-y1), start, extent);
|
||
if (arcPtr->fillStipple != None) {
|
||
XSetTSOrigin(display, arcPtr->fillGC, 0, 0);
|
||
}
|
||
}
|
||
if (arcPtr->outlineGC != None) {
|
||
if (extent != 0) {
|
||
XDrawArc(display, drawable, arcPtr->outlineGC, x1, y1, (x2-x1),
|
||
(y2-y1), start, extent);
|
||
}
|
||
|
||
/*
|
||
* If the outline width is very thin, don't use polygons to draw
|
||
* the linear parts of the outline (this often results in nothing
|
||
* being displayed); just draw lines instead.
|
||
*/
|
||
|
||
if (arcPtr->width <= 2) {
|
||
x1 = SCREEN_X(canvasPtr, arcPtr->center1[0]);
|
||
y1 = SCREEN_Y(canvasPtr, arcPtr->center1[1]);
|
||
x2 = SCREEN_X(canvasPtr, arcPtr->center2[0]);
|
||
y2 = SCREEN_Y(canvasPtr, arcPtr->center2[1]);
|
||
|
||
if (arcPtr->style == chordUid) {
|
||
XDrawLine(display, drawable, arcPtr->outlineGC,
|
||
x1, y1, x2, y2);
|
||
} else if (arcPtr->style == pieSliceUid) {
|
||
int cx, cy;
|
||
|
||
cx = SCREEN_X(canvasPtr, (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0);
|
||
cy = SCREEN_Y(canvasPtr, (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0);
|
||
XDrawLine(display, drawable, arcPtr->outlineGC,
|
||
cx, cy, x1, y1);
|
||
XDrawLine(display, drawable, arcPtr->outlineGC,
|
||
cx, cy, x2, y2);
|
||
}
|
||
} else {
|
||
if (arcPtr->style == chordUid) {
|
||
TkFillPolygon(canvasPtr, arcPtr->outlinePtr,
|
||
CHORD_OUTLINE_PTS, drawable, arcPtr->outlineGC);
|
||
} else if (arcPtr->style == pieSliceUid) {
|
||
TkFillPolygon(canvasPtr, arcPtr->outlinePtr,
|
||
PIE_OUTLINE1_PTS, drawable, arcPtr->outlineGC);
|
||
TkFillPolygon(canvasPtr,
|
||
arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
|
||
PIE_OUTLINE2_PTS, drawable, arcPtr->outlineGC);
|
||
}
|
||
}
|
||
}
|
||
if (arcPtr->stippleGCPtr != NULL) {
|
||
XSetTSOrigin(display, *arcPtr->stippleGCPtr, 0, 0);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ArcToPoint --
|
||
*
|
||
* Computes the distance from a given point to a given
|
||
* arc, in canvas units.
|
||
*
|
||
* Results:
|
||
* The return value is 0 if the point whose x and y coordinates
|
||
* are coordPtr[0] and coordPtr[1] is inside the arc. If the
|
||
* point isn't inside the arc then the return value is the
|
||
* distance from the point to the arc. If itemPtr is filled,
|
||
* then anywhere in the interior is considered "inside"; if
|
||
* itemPtr isn't filled, then "inside" means only the area
|
||
* occupied by the outline.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static double
|
||
ArcToPoint(canvasPtr, itemPtr, pointPtr)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against point. */
|
||
double *pointPtr; /* Pointer to x and y coordinates. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
double vertex[2], pointAngle, diff, dist, newDist;
|
||
double poly[8], polyDist, width, t1, t2;
|
||
int filled, angleInRange;
|
||
|
||
if ((arcPtr->fillGC != None) || (arcPtr->outlineGC == None)) {
|
||
filled = 1;
|
||
} else {
|
||
filled = 0;
|
||
}
|
||
|
||
/*
|
||
* See if the point is within the angular range of the arc.
|
||
* Remember, X angles are backwards from the way we'd normally
|
||
* think of them. Also, compensate for any eccentricity of
|
||
* the oval.
|
||
*/
|
||
|
||
vertex[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0;
|
||
vertex[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0;
|
||
t1 = (pointPtr[1] - vertex[1])/(arcPtr->bbox[3] - arcPtr->bbox[1]);
|
||
t2 = (pointPtr[0] - vertex[0])/(arcPtr->bbox[2] - arcPtr->bbox[0]);
|
||
if ((t1 == 0.0) && (t2 == 0.0)) {
|
||
pointAngle = 0;
|
||
} else {
|
||
pointAngle = -atan2(t1, t2)*180/PI;
|
||
}
|
||
diff = pointAngle - arcPtr->start;
|
||
diff -= ((int) (diff/360.0) * 360.0);
|
||
if (diff < 0) {
|
||
diff += 360.0;
|
||
}
|
||
angleInRange = (diff <= arcPtr->extent) ||
|
||
((arcPtr->extent < 0) && ((diff - 360.0) >= arcPtr->extent));
|
||
|
||
/*
|
||
* Now perform different tests depending on what kind of arc
|
||
* we're dealing with.
|
||
*/
|
||
|
||
if (arcPtr->style == arcUid) {
|
||
if (angleInRange) {
|
||
return TkOvalToPoint(arcPtr->bbox, (double) arcPtr->width,
|
||
0, pointPtr);
|
||
}
|
||
dist = hypot(pointPtr[0] - arcPtr->center1[0],
|
||
pointPtr[1] - arcPtr->center1[1]);
|
||
newDist = hypot(pointPtr[0] - arcPtr->center2[0],
|
||
pointPtr[1] - arcPtr->center2[1]);
|
||
if (newDist < dist) {
|
||
return newDist;
|
||
}
|
||
return dist;
|
||
}
|
||
|
||
if ((arcPtr->fillGC != None) || (arcPtr->outlineGC == None)) {
|
||
filled = 1;
|
||
} else {
|
||
filled = 0;
|
||
}
|
||
if (arcPtr->outlineGC == None) {
|
||
width = 0.0;
|
||
} else {
|
||
width = arcPtr->width;
|
||
}
|
||
|
||
if (arcPtr->style == pieSliceUid) {
|
||
if (width > 1.0) {
|
||
dist = TkPolygonToPoint(arcPtr->outlinePtr, PIE_OUTLINE1_PTS,
|
||
pointPtr);
|
||
newDist = TkPolygonToPoint(arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
|
||
PIE_OUTLINE2_PTS, pointPtr);
|
||
} else {
|
||
dist = TkLineToPoint(vertex, arcPtr->center1, pointPtr);
|
||
newDist = TkLineToPoint(vertex, arcPtr->center2, pointPtr);
|
||
}
|
||
if (newDist < dist) {
|
||
dist = newDist;
|
||
}
|
||
if (angleInRange) {
|
||
newDist = TkOvalToPoint(arcPtr->bbox, width, filled, pointPtr);
|
||
if (newDist < dist) {
|
||
dist = newDist;
|
||
}
|
||
}
|
||
return dist;
|
||
}
|
||
|
||
/*
|
||
* This is a chord-style arc. We have to deal specially with the
|
||
* triangular piece that represents the difference between a
|
||
* chord-style arc and a pie-slice arc (for small angles this piece
|
||
* is excluded here where it would be included for pie slices;
|
||
* for large angles the piece is included here but would be
|
||
* excluded for pie slices).
|
||
*/
|
||
|
||
if (width > 1.0) {
|
||
dist = TkPolygonToPoint(arcPtr->outlinePtr, CHORD_OUTLINE_PTS,
|
||
pointPtr);
|
||
} else {
|
||
dist = TkLineToPoint(arcPtr->center1, arcPtr->center2, pointPtr);
|
||
}
|
||
poly[0] = poly[6] = vertex[0];
|
||
poly[1] = poly[7] = vertex[1];
|
||
poly[2] = arcPtr->center1[0];
|
||
poly[3] = arcPtr->center1[1];
|
||
poly[4] = arcPtr->center2[0];
|
||
poly[5] = arcPtr->center2[1];
|
||
polyDist = TkPolygonToPoint(poly, 4, pointPtr);
|
||
if (angleInRange) {
|
||
if ((arcPtr->extent < -180.0) || (arcPtr->extent > 180.0)
|
||
|| (polyDist > 0.0)) {
|
||
newDist = TkOvalToPoint(arcPtr->bbox, width, filled, pointPtr);
|
||
if (newDist < dist) {
|
||
dist = newDist;
|
||
}
|
||
}
|
||
} else {
|
||
if ((arcPtr->extent < -180.0) || (arcPtr->extent > 180.0)) {
|
||
if (filled && (polyDist < dist)) {
|
||
dist = polyDist;
|
||
}
|
||
}
|
||
}
|
||
return dist;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ArcToArea --
|
||
*
|
||
* This procedure is called to determine whether an item
|
||
* lies entirely inside, entirely outside, or overlapping
|
||
* a given area.
|
||
*
|
||
* Results:
|
||
* -1 is returned if the item is entirely outside the area
|
||
* given by rectPtr, 0 if it overlaps, and 1 if it is entirely
|
||
* inside the given area.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
ArcToArea(canvasPtr, itemPtr, rectPtr)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against arc. */
|
||
double *rectPtr; /* Pointer to array of four coordinates
|
||
* (x1, y1, x2, y2) describing rectangular
|
||
* area. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
double rx, ry; /* Radii for transformed oval: these define
|
||
* an oval centered at the origin. */
|
||
double tRect[4]; /* Transformed version of x1, y1, x2, y2,
|
||
* for coord. system where arc is centered
|
||
* on the origin. */
|
||
double center[2], width, angle, tmp;
|
||
double points[20], *pointPtr;
|
||
int numPoints, filled;
|
||
int inside; /* Non-zero means every test so far suggests
|
||
* that arc is inside rectangle. 0 means
|
||
* every test so far shows arc to be outside
|
||
* of rectangle. */
|
||
int newInside;
|
||
|
||
if ((arcPtr->fillGC != None) || (arcPtr->outlineGC == None)) {
|
||
filled = 1;
|
||
} else {
|
||
filled = 0;
|
||
}
|
||
if (arcPtr->outlineGC == None) {
|
||
width = 0.0;
|
||
} else {
|
||
width = arcPtr->width;
|
||
}
|
||
|
||
/*
|
||
* Transform both the arc and the rectangle so that the arc's oval
|
||
* is centered on the origin.
|
||
*/
|
||
|
||
center[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0;
|
||
center[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0;
|
||
tRect[0] = rectPtr[0] - center[0];
|
||
tRect[1] = rectPtr[1] - center[1];
|
||
tRect[2] = rectPtr[2] - center[0];
|
||
tRect[3] = rectPtr[3] - center[1];
|
||
rx = arcPtr->bbox[2] - center[0] + width/2.0;
|
||
ry = arcPtr->bbox[3] - center[1] + width/2.0;
|
||
|
||
/*
|
||
* Find the extreme points of the arc and see whether these are all
|
||
* inside the rectangle (in which case we're done), partly in and
|
||
* partly out (in which case we're done), or all outside (in which
|
||
* case we have more work to do). The extreme points include the
|
||
* following, which are checked in order:
|
||
*
|
||
* 1. The outside points of the arc, corresponding to start and
|
||
* extent.
|
||
* 2. The center of the arc (but only in pie-slice mode).
|
||
* 3. The 12, 3, 6, and 9-o'clock positions (but only if the arc
|
||
* includes those angles).
|
||
*/
|
||
|
||
pointPtr = points;
|
||
numPoints = 0;
|
||
angle = -arcPtr->start*(PI/180.0);
|
||
pointPtr[0] = rx*cos(angle);
|
||
pointPtr[1] = ry*sin(angle);
|
||
angle += -arcPtr->extent*(PI/180.0);
|
||
pointPtr[2] = rx*cos(angle);
|
||
pointPtr[3] = ry*sin(angle);
|
||
numPoints = 2;
|
||
pointPtr += 4;
|
||
|
||
if ((arcPtr->style == pieSliceUid) && (arcPtr->extent < 180.0)) {
|
||
pointPtr[0] = 0.0;
|
||
pointPtr[1] = 0.0;
|
||
numPoints++;
|
||
pointPtr += 2;
|
||
}
|
||
|
||
tmp = -arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
pointPtr[0] = rx;
|
||
pointPtr[1] = 0.0;
|
||
numPoints++;
|
||
pointPtr += 2;
|
||
}
|
||
tmp = 90.0 - arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
pointPtr[0] = 0.0;
|
||
pointPtr[1] = -ry;
|
||
numPoints++;
|
||
pointPtr += 2;
|
||
}
|
||
tmp = 180.0 - arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
pointPtr[0] = -rx;
|
||
pointPtr[1] = 0.0;
|
||
numPoints++;
|
||
pointPtr += 2;
|
||
}
|
||
tmp = 270.0 - arcPtr->start;
|
||
if (tmp < 0) {
|
||
tmp += 360.0;
|
||
}
|
||
if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
|
||
pointPtr[0] = 0.0;
|
||
pointPtr[1] = ry;
|
||
numPoints++;
|
||
pointPtr += 2;
|
||
}
|
||
|
||
/*
|
||
* Now that we've located the extreme points, loop through them all
|
||
* to see which are inside the rectangle.
|
||
*/
|
||
|
||
inside = (points[0] > tRect[0]) && (points[0] < tRect[2])
|
||
&& (points[1] > tRect[1]) && (points[1] < tRect[3]);
|
||
for (pointPtr = points+2; numPoints > 1; pointPtr += 2, numPoints--) {
|
||
newInside = (pointPtr[0] > tRect[0]) && (pointPtr[0] < tRect[2])
|
||
&& (pointPtr[1] > tRect[1]) && (pointPtr[1] < tRect[3]);
|
||
if (newInside != inside) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (inside) {
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
* So far, oval appears to be outside rectangle, but can't yet tell
|
||
* for sure. Next, test each of the four sides of the rectangle
|
||
* against the bounding region for the arc. If any intersections
|
||
* are found, then return "overlapping". First, test against the
|
||
* polygon(s) forming the sides of a chord or pie-slice.
|
||
*/
|
||
|
||
if (arcPtr->style == pieSliceUid) {
|
||
if (width >= 1.0) {
|
||
if (TkPolygonToArea(arcPtr->outlinePtr, PIE_OUTLINE1_PTS,
|
||
rectPtr) != -1) {
|
||
return 0;
|
||
}
|
||
if (TkPolygonToArea(arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
|
||
PIE_OUTLINE2_PTS, rectPtr) != -1) {
|
||
return 0;
|
||
}
|
||
} else {
|
||
if ((TkLineToArea(center, arcPtr->center1, rectPtr) != -1) ||
|
||
(TkLineToArea(center, arcPtr->center2, rectPtr) != -1)) {
|
||
return 0;
|
||
}
|
||
}
|
||
} else if (arcPtr->style == chordUid) {
|
||
if (width >= 1.0) {
|
||
if (TkPolygonToArea(arcPtr->outlinePtr, CHORD_OUTLINE_PTS,
|
||
rectPtr) != -1) {
|
||
return 0;
|
||
}
|
||
} else {
|
||
if (TkLineToArea(arcPtr->center1, arcPtr->center2,
|
||
rectPtr) != -1) {
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Next check for overlap between each of the four sides and the
|
||
* outer perimiter of the arc. If the arc isn't filled, then also
|
||
* check the inner perimeter of the arc.
|
||
*/
|
||
|
||
if (HorizLineToArc(tRect[0], tRect[2], tRect[1], rx, ry, arcPtr->start,
|
||
arcPtr->extent)
|
||
|| HorizLineToArc(tRect[0], tRect[2], tRect[3], rx, ry,
|
||
arcPtr->start, arcPtr->extent)
|
||
|| VertLineToArc(tRect[0], tRect[1], tRect[3], rx, ry,
|
||
arcPtr->start, arcPtr->extent)
|
||
|| VertLineToArc(tRect[2], tRect[1], tRect[3], rx, ry,
|
||
arcPtr->start, arcPtr->extent)) {
|
||
return 0;
|
||
}
|
||
if ((width > 1.0) && !filled) {
|
||
rx -= width;
|
||
ry -= width;
|
||
if (HorizLineToArc(tRect[0], tRect[2], tRect[1], rx, ry, arcPtr->start,
|
||
arcPtr->extent)
|
||
|| HorizLineToArc(tRect[0], tRect[2], tRect[3], rx, ry,
|
||
arcPtr->start, arcPtr->extent)
|
||
|| VertLineToArc(tRect[0], tRect[1], tRect[3], rx, ry,
|
||
arcPtr->start, arcPtr->extent)
|
||
|| VertLineToArc(tRect[2], tRect[1], tRect[3], rx, ry,
|
||
arcPtr->start, arcPtr->extent)) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* The arc still appears to be totally disjoint from the rectangle,
|
||
* but it's also possible that the rectangle is totally inside the arc.
|
||
* Do one last check, which is to check one point of the rectangle
|
||
* to see if it's inside the arc. If it is, we've got overlap. If
|
||
* it isn't, the arc's really outside the rectangle.
|
||
*/
|
||
|
||
if (ArcToPoint(canvasPtr, itemPtr, rectPtr) == 0.0) {
|
||
return 0;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleArc --
|
||
*
|
||
* This procedure is invoked to rescale an arc item.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The arc referred to by itemPtr is rescaled so that the
|
||
* following transformation is applied to all point
|
||
* coordinates:
|
||
* x' = originX + scaleX*(x-originX)
|
||
* y' = originY + scaleY*(y-originY)
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ScaleArc(canvasPtr, itemPtr, originX, originY, scaleX, scaleY)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing arc. */
|
||
Tk_Item *itemPtr; /* Arc to be scaled. */
|
||
double originX, originY; /* Origin about which to scale rect. */
|
||
double scaleX; /* Amount to scale in X direction. */
|
||
double scaleY; /* Amount to scale in Y direction. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
|
||
arcPtr->bbox[0] = originX + scaleX*(arcPtr->bbox[0] - originX);
|
||
arcPtr->bbox[1] = originY + scaleY*(arcPtr->bbox[1] - originY);
|
||
arcPtr->bbox[2] = originX + scaleX*(arcPtr->bbox[2] - originX);
|
||
arcPtr->bbox[3] = originY + scaleY*(arcPtr->bbox[3] - originY);
|
||
ComputeArcBbox(canvasPtr, arcPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TranslateArc --
|
||
*
|
||
* This procedure is called to move an arc by a given amount.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The position of the arc is offset by (xDelta, yDelta), and
|
||
* the bounding box is updated in the generic part of the item
|
||
* structure.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
TranslateArc(canvasPtr, itemPtr, deltaX, deltaY)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item that is being moved. */
|
||
double deltaX, deltaY; /* Amount by which item is to be
|
||
* moved. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
|
||
arcPtr->bbox[0] += deltaX;
|
||
arcPtr->bbox[1] += deltaY;
|
||
arcPtr->bbox[2] += deltaX;
|
||
arcPtr->bbox[3] += deltaY;
|
||
ComputeArcBbox(canvasPtr, arcPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ComputeArcOutline --
|
||
*
|
||
* This procedure creates a polygon describing everything in
|
||
* the outline for an arc except what's in the curved part.
|
||
* For a "pie slice" arc this is a V-shaped chunk, and for
|
||
* a "chord" arc this is a linear chunk (with cutaway corners).
|
||
* For "arc" arcs, this stuff isn't relevant.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The information at arcPtr->outlinePtr gets modified, and
|
||
* storage for arcPtr->outlinePtr may be allocated or freed.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ComputeArcOutline(arcPtr)
|
||
register ArcItem *arcPtr;
|
||
{
|
||
double sin1, cos1, sin2, cos2, angle, halfWidth;
|
||
double boxWidth, boxHeight;
|
||
double vertex[2], corner1[2], corner2[2];
|
||
double *outlinePtr;
|
||
|
||
/*
|
||
* Make sure that the outlinePtr array is large enough to hold
|
||
* either a chord or pie-slice outline.
|
||
*/
|
||
|
||
if (arcPtr->numOutlinePoints == 0) {
|
||
arcPtr->outlinePtr = (double *) ckalloc((unsigned)
|
||
(26 * sizeof(double)));
|
||
arcPtr->numOutlinePoints = 22;
|
||
}
|
||
outlinePtr = arcPtr->outlinePtr;
|
||
|
||
/*
|
||
* First compute the two points that lie at the centers of
|
||
* the ends of the curved arc segment, which are marked with
|
||
* X's in the figure below:
|
||
*
|
||
*
|
||
* * * *
|
||
* * *
|
||
* * * * *
|
||
* * * * *
|
||
* * * * *
|
||
* X * * X
|
||
*
|
||
* The code is tricky because the arc can be ovular in shape.
|
||
* It computes the position for a unit circle, and then
|
||
* scales to fit the shape of the arc's bounding box.
|
||
*
|
||
* Also, watch out because angles go counter-clockwise like you
|
||
* might expect, but the y-coordinate system is inverted. To
|
||
* handle this, just negate the angles in all the computations.
|
||
*/
|
||
|
||
boxWidth = arcPtr->bbox[2] - arcPtr->bbox[0];
|
||
boxHeight = arcPtr->bbox[3] - arcPtr->bbox[1];
|
||
angle = -arcPtr->start*PI/180.0;
|
||
sin1 = sin(angle);
|
||
cos1 = cos(angle);
|
||
angle -= arcPtr->extent*PI/180.0;
|
||
sin2 = sin(angle);
|
||
cos2 = cos(angle);
|
||
vertex[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0;
|
||
vertex[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0;
|
||
arcPtr->center1[0] = vertex[0] + cos1*boxWidth/2.0;
|
||
arcPtr->center1[1] = vertex[1] + sin1*boxHeight/2.0;
|
||
arcPtr->center2[0] = vertex[0] + cos2*boxWidth/2.0;
|
||
arcPtr->center2[1] = vertex[1] + sin2*boxHeight/2.0;
|
||
|
||
/*
|
||
* Next compute the "outermost corners" of the arc, which are
|
||
* marked with X's in the figure below:
|
||
*
|
||
* * * *
|
||
* * *
|
||
* * * * *
|
||
* * * * *
|
||
* X * * X
|
||
* * *
|
||
*
|
||
* The code below is tricky because it has to handle eccentricity
|
||
* in the shape of the oval. The key in the code below is to
|
||
* realize that the slope of the line from arcPtr->center1 to corner1
|
||
* is (boxWidth*sin1)/(boxHeight*cos1), and similarly for arcPtr->center2
|
||
* and corner2. These formulas can be computed from the formula for
|
||
* the oval.
|
||
*/
|
||
|
||
halfWidth = arcPtr->width/2.0;
|
||
angle = atan2(boxWidth*sin1, boxHeight*cos1);
|
||
corner1[0] = arcPtr->center1[0] + cos(angle)*halfWidth;
|
||
corner1[1] = arcPtr->center1[1] + sin(angle)*halfWidth;
|
||
angle = atan2(boxWidth*sin2, boxHeight*cos2);
|
||
corner2[0] = arcPtr->center2[0] + cos(angle)*halfWidth;
|
||
corner2[1] = arcPtr->center2[1] + sin(angle)*halfWidth;
|
||
|
||
/*
|
||
* For a chord outline, generate a six-sided polygon with three
|
||
* points for each end of the chord. The first and third points
|
||
* for each end are butt points generated on either side of the
|
||
* center point. The second point is the corner point.
|
||
*/
|
||
|
||
if (arcPtr->style == chordUid) {
|
||
outlinePtr[0] = outlinePtr[12] = corner1[0];
|
||
outlinePtr[1] = outlinePtr[13] = corner1[1];
|
||
TkGetButtPoints(arcPtr->center2, arcPtr->center1,
|
||
(double) arcPtr->width, 0, outlinePtr+10, outlinePtr+2);
|
||
outlinePtr[4] = arcPtr->center2[0] + outlinePtr[2]
|
||
- arcPtr->center1[0];
|
||
outlinePtr[5] = arcPtr->center2[1] + outlinePtr[3]
|
||
- arcPtr->center1[1];
|
||
outlinePtr[6] = corner2[0];
|
||
outlinePtr[7] = corner2[1];
|
||
outlinePtr[8] = arcPtr->center2[0] + outlinePtr[10]
|
||
- arcPtr->center1[0];
|
||
outlinePtr[9] = arcPtr->center2[1] + outlinePtr[11]
|
||
- arcPtr->center1[1];
|
||
} else if (arcPtr->style == pieSliceUid) {
|
||
/*
|
||
* For pie slices, generate two polygons, one for each side
|
||
* of the pie slice. The first arm has a shape like this,
|
||
* where the center of the oval is X, arcPtr->center1 is at Y, and
|
||
* corner1 is at Z:
|
||
*
|
||
* _____________________
|
||
* | \
|
||
* | \
|
||
* X Y Z
|
||
* | /
|
||
* |_____________________/
|
||
*
|
||
*/
|
||
|
||
TkGetButtPoints(arcPtr->center1, vertex, (double) arcPtr->width, 0,
|
||
outlinePtr, outlinePtr+2);
|
||
outlinePtr[4] = arcPtr->center1[0] + outlinePtr[2] - vertex[0];
|
||
outlinePtr[5] = arcPtr->center1[1] + outlinePtr[3] - vertex[1];
|
||
outlinePtr[6] = corner1[0];
|
||
outlinePtr[7] = corner1[1];
|
||
outlinePtr[8] = arcPtr->center1[0] + outlinePtr[0] - vertex[0];
|
||
outlinePtr[9] = arcPtr->center1[1] + outlinePtr[1] - vertex[1];
|
||
outlinePtr[10] = outlinePtr[0];
|
||
outlinePtr[11] = outlinePtr[1];
|
||
|
||
/*
|
||
* The second arm has a shape like this:
|
||
*
|
||
*
|
||
* ______________________
|
||
* / \
|
||
* / \
|
||
* Z Y X /
|
||
* \ /
|
||
* \______________________/
|
||
*
|
||
* Similar to above X is the center of the oval/circle, Y is
|
||
* arcPtr->center2, and Z is corner2. The extra jog out to the left
|
||
* of X is needed in or to produce a butted joint with the
|
||
* first arm; the corner to the right of X is one of the
|
||
* first two points of the first arm, depending on extent.
|
||
*/
|
||
|
||
TkGetButtPoints(arcPtr->center2, vertex, (double) arcPtr->width, 0,
|
||
outlinePtr+12, outlinePtr+16);
|
||
if ((arcPtr->extent > 180) ||
|
||
((arcPtr->extent < 0) && (arcPtr->extent > -180))) {
|
||
outlinePtr[14] = outlinePtr[0];
|
||
outlinePtr[15] = outlinePtr[1];
|
||
} else {
|
||
outlinePtr[14] = outlinePtr[2];
|
||
outlinePtr[15] = outlinePtr[3];
|
||
}
|
||
outlinePtr[18] = arcPtr->center2[0] + outlinePtr[16] - vertex[0];
|
||
outlinePtr[19] = arcPtr->center2[1] + outlinePtr[17] - vertex[1];
|
||
outlinePtr[20] = corner2[0];
|
||
outlinePtr[21] = corner2[1];
|
||
outlinePtr[22] = arcPtr->center2[0] + outlinePtr[12] - vertex[0];
|
||
outlinePtr[23] = arcPtr->center2[1] + outlinePtr[13] - vertex[1];
|
||
outlinePtr[24] = outlinePtr[12];
|
||
outlinePtr[25] = outlinePtr[13];
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* HorizLineToArc --
|
||
*
|
||
* Determines whether a horizontal line segment intersects
|
||
* a given arc.
|
||
*
|
||
* Results:
|
||
* The return value is 1 if the given line intersects the
|
||
* infinitely-thin arc section defined by rx, ry, start,
|
||
* and extent, and 0 otherwise. Only the perimeter of the
|
||
* arc is checked: interior areas (e.g. pie-slice or chord)
|
||
* are not checked.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
HorizLineToArc(x1, x2, y, rx, ry, start, extent)
|
||
double x1, x2; /* X-coords of endpoints of line segment.
|
||
* X1 must be <= x2. */
|
||
double y; /* Y-coordinate of line segment. */
|
||
double rx, ry; /* These x- and y-radii define an oval
|
||
* centered at the origin. */
|
||
double start, extent; /* Angles that define extent of arc, in
|
||
* the standard fashion for this module. */
|
||
{
|
||
double tmp;
|
||
double tx, ty; /* Coordinates of intersection point in
|
||
* transformed coordinate system. */
|
||
double x;
|
||
|
||
/*
|
||
* Compute the x-coordinate of one possible intersection point
|
||
* between the arc and the line. Use a transformed coordinate
|
||
* system where the oval is a unit circle centered at the origin.
|
||
* Then scale back to get actual x-coordinate.
|
||
*/
|
||
|
||
ty = y/ry;
|
||
tmp = 1 - ty*ty;
|
||
if (tmp < 0) {
|
||
return 0;
|
||
}
|
||
tx = sqrt(tmp);
|
||
x = tx*rx;
|
||
|
||
/*
|
||
* Test both intersection points.
|
||
*/
|
||
|
||
if ((x >= x1) && (x <= x2) && AngleInRange(tx, ty, start, extent)) {
|
||
return 1;
|
||
}
|
||
if ((-x >= x1) && (-x <= x2) && AngleInRange(-tx, ty, start, extent)) {
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* VertLineToArc --
|
||
*
|
||
* Determines whether a vertical line segment intersects
|
||
* a given arc.
|
||
*
|
||
* Results:
|
||
* The return value is 1 if the given line intersects the
|
||
* infinitely-thin arc section defined by rx, ry, start,
|
||
* and extent, and 0 otherwise. Only the perimeter of the
|
||
* arc is checked: interior areas (e.g. pie-slice or chord)
|
||
* are not checked.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
VertLineToArc(x, y1, y2, rx, ry, start, extent)
|
||
double x; /* X-coordinate of line segment. */
|
||
double y1, y2; /* Y-coords of endpoints of line segment.
|
||
* Y1 must be <= y2. */
|
||
double rx, ry; /* These x- and y-radii define an oval
|
||
* centered at the origin. */
|
||
double start, extent; /* Angles that define extent of arc, in
|
||
* the standard fashion for this module. */
|
||
{
|
||
double tmp;
|
||
double tx, ty; /* Coordinates of intersection point in
|
||
* transformed coordinate system. */
|
||
double y;
|
||
|
||
/*
|
||
* Compute the y-coordinate of one possible intersection point
|
||
* between the arc and the line. Use a transformed coordinate
|
||
* system where the oval is a unit circle centered at the origin.
|
||
* Then scale back to get actual y-coordinate.
|
||
*/
|
||
|
||
tx = x/rx;
|
||
tmp = 1 - tx*tx;
|
||
if (tmp < 0) {
|
||
return 0;
|
||
}
|
||
ty = sqrt(tmp);
|
||
y = ty*ry;
|
||
|
||
/*
|
||
* Test both intersection points.
|
||
*/
|
||
|
||
if ((y > y1) && (y < y2) && AngleInRange(tx, ty, start, extent)) {
|
||
return 1;
|
||
}
|
||
if ((-y > y1) && (-y < y2) && AngleInRange(tx, -ty, start, extent)) {
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* AngleInRange --
|
||
*
|
||
* Determine whether the angle from the origin to a given
|
||
* point is within a given range.
|
||
*
|
||
* Results:
|
||
* The return value is 1 if the angle from (0,0) to (x,y)
|
||
* is in the range given by start and extent, where angles
|
||
* are interpreted in the standard way for ovals (meaning
|
||
* backwards from normal interpretation). Otherwise the
|
||
* return value is 0.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
AngleInRange(x, y, start, extent)
|
||
double x, y; /* Coordinate of point; angle measured
|
||
* from origin to here, relative to x-axis. */
|
||
double start; /* First angle, degrees, >=0, <=360. */
|
||
double extent; /* Size of arc in degrees >=-360, <=360. */
|
||
{
|
||
double diff;
|
||
|
||
diff = -atan2(y, x);
|
||
if ((x == 0.0) && (y == 0.0)) {
|
||
return 1;
|
||
}
|
||
diff = diff*(180.0/PI) - start;
|
||
while (diff > 360.0) {
|
||
diff -= 360.0;
|
||
}
|
||
while (diff < 0.0) {
|
||
diff += 360.0;
|
||
}
|
||
if (extent >= 0) {
|
||
return diff <= extent;
|
||
}
|
||
return (diff-360.0) >= extent;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ArcToPostscript --
|
||
*
|
||
* This procedure is called to generate Postscript for
|
||
* arc items.
|
||
*
|
||
* Results:
|
||
* The return value is a standard Tcl result. If an error
|
||
* occurs in generating Postscript then an error message is
|
||
* left in canvasPtr->interp->result, replacing whatever used
|
||
* to be there. If no error occurs, then Postscript for the
|
||
* item is appended to the result.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ArcToPostscript(canvasPtr, itemPtr, psInfoPtr)
|
||
Tk_Canvas *canvasPtr; /* Information about overall canvas. */
|
||
Tk_Item *itemPtr; /* Item for which Postscript is
|
||
* wanted. */
|
||
Tk_PostscriptInfo *psInfoPtr; /* Information about the Postscript;
|
||
* must be passed back to Postscript
|
||
* utility procedures. */
|
||
{
|
||
register ArcItem *arcPtr = (ArcItem *) itemPtr;
|
||
char buffer[400];
|
||
double y1, y2, ang1, ang2;
|
||
|
||
y1 = TkCanvPsY(psInfoPtr, arcPtr->bbox[1]);
|
||
y2 = TkCanvPsY(psInfoPtr, arcPtr->bbox[3]);
|
||
ang1 = arcPtr->start;
|
||
ang2 = ang1 + arcPtr->extent;
|
||
if (ang2 < ang1) {
|
||
ang1 = ang2;
|
||
ang2 = arcPtr->start;
|
||
}
|
||
|
||
/*
|
||
* If the arc is filled, output Postscript for the interior region
|
||
* of the arc.
|
||
*/
|
||
|
||
if (arcPtr->fillGC != None) {
|
||
sprintf(buffer, "matrix currentmatrix\n%.15g %.15g translate %.15g %.15g scale\n",
|
||
(arcPtr->bbox[0] + arcPtr->bbox[2])/2, (y1 + y2)/2,
|
||
(arcPtr->bbox[2] - arcPtr->bbox[0])/2, (y1 - y2)/2);
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
if (arcPtr->style == chordUid) {
|
||
sprintf(buffer, "0 0 1 %.15g %.15g arc closepath\nsetmatrix\n",
|
||
ang1, ang2);
|
||
} else {
|
||
sprintf(buffer,
|
||
"0 0 moveto 0 0 1 %.15g %.15g arc closepath\nsetmatrix\n",
|
||
ang1, ang2);
|
||
}
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, arcPtr->fillColor) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
};
|
||
if (arcPtr->fillStipple != None) {
|
||
if (TkCanvPsStipple(canvasPtr, psInfoPtr, arcPtr->fillStipple, 1)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
} else {
|
||
Tcl_AppendResult(canvasPtr->interp, "fill\n", (char *) NULL);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* If there's an outline for the arc, draw it.
|
||
*/
|
||
|
||
if (arcPtr->outlineGC != None) {
|
||
sprintf(buffer, "matrix currentmatrix\n%.15g %.15g translate %.15g %.15g scale\n",
|
||
(arcPtr->bbox[0] + arcPtr->bbox[2])/2, (y1 + y2)/2,
|
||
(arcPtr->bbox[2] - arcPtr->bbox[0])/2, (y1 - y2)/2);
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
sprintf(buffer, "0 0 1 %.15g %.15g arc\nsetmatrix\n", ang1, ang2);
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
sprintf(buffer, "%d setlinewidth\n0 setlinecap\n", arcPtr->width);
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
if (arcPtr->style == arcUid) {
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, arcPtr->fillColor)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
};
|
||
if (arcPtr->fillStipple != None) {
|
||
if (TkCanvPsStipple(canvasPtr, psInfoPtr,
|
||
arcPtr->fillStipple, 0) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
} else {
|
||
Tcl_AppendResult(canvasPtr->interp, "stroke\n", (char *) NULL);
|
||
}
|
||
} else {
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, arcPtr->outlineColor)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
};
|
||
Tcl_AppendResult(canvasPtr->interp, "stroke\n", (char *) NULL);
|
||
if (arcPtr->style == chordUid) {
|
||
TkCanvPsPath(canvasPtr->interp, arcPtr->outlinePtr,
|
||
CHORD_OUTLINE_PTS, psInfoPtr);
|
||
Tcl_AppendResult(canvasPtr->interp, "fill\n", (char *) NULL);
|
||
} else {
|
||
TkCanvPsPath(canvasPtr->interp, arcPtr->outlinePtr,
|
||
PIE_OUTLINE1_PTS, psInfoPtr);
|
||
Tcl_AppendResult(canvasPtr->interp, "fill\n", (char *) NULL);
|
||
TkCanvPsPath(canvasPtr->interp,
|
||
arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
|
||
PIE_OUTLINE2_PTS, psInfoPtr);
|
||
Tcl_AppendResult(canvasPtr->interp, "fill\n", (char *) NULL);
|
||
}
|
||
}
|
||
}
|
||
|
||
return TCL_OK;
|
||
}
|