999 lines
30 KiB
C
999 lines
30 KiB
C
/*
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* tkRectOval.c --
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*
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* This file implements rectangle and oval items for canvas
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* widgets.
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*
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* Copyright (c) 1991-1993 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/tkRectOval.c,v 1.23 93/09/15 08:19:31 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 rectangle/oval item.
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*/
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typedef struct RectOvalItem {
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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 of bounding box for rectangle
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* or oval (x1, y1, x2, y2). Item includes
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* x1 and x2 but not y1 and y2. */
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int width; /* Width of outline. */
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XColor *outlineColor; /* Color for outline. */
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XColor *fillColor; /* Color for filling rectangle/oval. */
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Pixmap fillStipple; /* Stipple bitmap for filling item. */
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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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} RectOvalItem;
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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_COLOR, "-fill", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(RectOvalItem, fillColor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
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"black", Tk_Offset(RectOvalItem, outlineColor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(RectOvalItem, fillStipple), TK_CONFIG_NULL_OK},
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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(RectOvalItem, 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 void ComputeRectOvalBbox _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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RectOvalItem *rectOvalPtr));
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static int ConfigureRectOval _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 CreateRectOval _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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struct Tk_Item *itemPtr, int argc, char **argv));
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static void DeleteRectOval _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr));
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static void DisplayRectOval _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Drawable dst));
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static int OvalToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *areaPtr));
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static double OvalToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *pointPtr));
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static int RectOvalCoords _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int argc, char **argv));
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static int RectOvalToPostscript _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Tk_PostscriptInfo *psInfoPtr));
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static int RectToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *areaPtr));
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static double RectToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *pointPtr));
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static void ScaleRectOval _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 TranslateRectOval _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double deltaX, double deltaY));
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/*
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* The structures below defines the rectangle and oval item types
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* by means of procedures that can be invoked by generic item code.
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*/
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Tk_ItemType TkRectangleType = {
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"rectangle", /* name */
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sizeof(RectOvalItem), /* itemSize */
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CreateRectOval, /* createProc */
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configSpecs, /* configSpecs */
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ConfigureRectOval, /* configureProc */
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RectOvalCoords, /* coordProc */
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DeleteRectOval, /* deleteProc */
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DisplayRectOval, /* displayProc */
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0, /* alwaysRedraw */
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RectToPoint, /* pointProc */
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RectToArea, /* areaProc */
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RectOvalToPostscript, /* postscriptProc */
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ScaleRectOval, /* scaleProc */
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TranslateRectOval, /* 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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Tk_ItemType TkOvalType = {
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"oval", /* name */
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sizeof(RectOvalItem), /* itemSize */
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CreateRectOval, /* createProc */
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configSpecs, /* configSpecs */
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ConfigureRectOval, /* configureProc */
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RectOvalCoords, /* coordProc */
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DeleteRectOval, /* deleteProc */
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DisplayRectOval, /* displayProc */
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0, /* alwaysRedraw */
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OvalToPoint, /* pointProc */
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OvalToArea, /* areaProc */
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RectOvalToPostscript, /* postscriptProc */
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ScaleRectOval, /* scaleProc */
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TranslateRectOval, /* translateProc */
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(Tk_ItemIndexProc *) NULL, /* indexProc */
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(Tk_ItemCursorProc *) NULL, /* cursorProc */
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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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/*
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*--------------------------------------------------------------
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*
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* CreateRectOval --
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*
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* This procedure is invoked to create a new rectangle
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* or oval item in 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 rectangle or oval 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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CreateRectOval(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 rectangle. */
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{
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register RectOvalItem *rectOvalPtr = (RectOvalItem *) 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 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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rectOvalPtr->width = 1;
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rectOvalPtr->outlineColor = NULL;
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rectOvalPtr->fillColor = NULL;
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rectOvalPtr->fillStipple = None;
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rectOvalPtr->outlineGC = None;
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rectOvalPtr->fillGC = None;
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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], &rectOvalPtr->bbox[0]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[1],
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&rectOvalPtr->bbox[1]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[2],
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&rectOvalPtr->bbox[2]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[3],
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&rectOvalPtr->bbox[3]) != TCL_OK)) {
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return TCL_ERROR;
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}
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if (ConfigureRectOval(canvasPtr, itemPtr, argc-4, argv+4, 0) != TCL_OK) {
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DeleteRectOval(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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* RectOvalCoords --
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*
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* This procedure is invoked to process the "coords" widget
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* command on rectangles and ovals. See the user documentation
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* for details 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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RectOvalCoords(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 RectOvalItem *rectOvalPtr = (RectOvalItem *) 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, rectOvalPtr->bbox[0], c0);
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Tcl_PrintDouble(canvasPtr->interp, rectOvalPtr->bbox[1], c1);
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Tcl_PrintDouble(canvasPtr->interp, rectOvalPtr->bbox[2], c2);
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Tcl_PrintDouble(canvasPtr->interp, rectOvalPtr->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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&rectOvalPtr->bbox[0]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[1],
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&rectOvalPtr->bbox[1]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[2],
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&rectOvalPtr->bbox[2]) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[3],
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&rectOvalPtr->bbox[3]) != TCL_OK)) {
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return TCL_ERROR;
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}
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ComputeRectOvalBbox(canvasPtr, rectOvalPtr);
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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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* ConfigureRectOval --
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*
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* This procedure is invoked to configure various aspects
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* of a rectangle or oval item, such as its border and
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* background 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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ConfigureRectOval(canvasPtr, itemPtr, argc, argv, flags)
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Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */
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Tk_Item *itemPtr; /* Rectangle 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 RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
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XGCValues gcValues;
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GC newGC;
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unsigned long mask;
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if (Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
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configSpecs, argc, argv, (char *) rectOvalPtr, 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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* graphics contexts.
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*/
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if (rectOvalPtr->outlineColor == NULL) {
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newGC = None;
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} else {
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gcValues.foreground = rectOvalPtr->outlineColor->pixel;
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gcValues.cap_style = CapProjecting;
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if (rectOvalPtr->width < 0) {
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rectOvalPtr->width = 1;
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}
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gcValues.line_width = rectOvalPtr->width;
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mask = GCForeground|GCCapStyle|GCLineWidth;
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newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
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}
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if (rectOvalPtr->outlineGC != None) {
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Tk_FreeGC(canvasPtr->display, rectOvalPtr->outlineGC);
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}
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rectOvalPtr->outlineGC = newGC;
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if (rectOvalPtr->fillColor == NULL) {
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newGC = None;
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} else {
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gcValues.foreground = rectOvalPtr->fillColor->pixel;
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if (rectOvalPtr->fillStipple != None) {
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gcValues.stipple = rectOvalPtr->fillStipple;
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gcValues.fill_style = FillStippled;
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mask = GCForeground|GCStipple|GCFillStyle;
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} else {
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mask = GCForeground;
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}
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newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
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}
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if (rectOvalPtr->fillGC != None) {
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Tk_FreeGC(canvasPtr->display, rectOvalPtr->fillGC);
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}
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rectOvalPtr->fillGC = newGC;
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ComputeRectOvalBbox(canvasPtr, rectOvalPtr);
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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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* DeleteRectOval --
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*
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* This procedure is called to clean up the data structure
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* associated with a rectangle or oval item.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Resources associated with itemPtr are released.
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*
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*--------------------------------------------------------------
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*/
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static void
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DeleteRectOval(canvasPtr, itemPtr)
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Tk_Canvas *canvasPtr; /* Info about overall widget. */
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Tk_Item *itemPtr; /* Item that is being deleted. */
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{
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register RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
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if (rectOvalPtr->outlineColor != NULL) {
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Tk_FreeColor(rectOvalPtr->outlineColor);
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}
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if (rectOvalPtr->fillColor != NULL) {
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Tk_FreeColor(rectOvalPtr->fillColor);
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}
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if (rectOvalPtr->fillStipple != None) {
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Tk_FreeBitmap(canvasPtr->display, rectOvalPtr->fillStipple);
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}
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if (rectOvalPtr->outlineGC != None) {
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Tk_FreeGC(canvasPtr->display, rectOvalPtr->outlineGC);
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}
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if (rectOvalPtr->fillGC != None) {
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Tk_FreeGC(canvasPtr->display, rectOvalPtr->fillGC);
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}
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}
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/*
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*--------------------------------------------------------------
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*
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* ComputeRectOvalBbox --
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*
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* This procedure is invoked to compute the bounding box of
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* all the pixels that may be drawn as part of a rectangle
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* or oval.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The fields x1, y1, x2, and y2 are updated in the header
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* for itemPtr.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static void
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ComputeRectOvalBbox(canvasPtr, rectOvalPtr)
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Tk_Canvas *canvasPtr; /* Canvas that contains item. */
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register RectOvalItem *rectOvalPtr; /* Item whose bbox is to be
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* recomputed. */
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{
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int bloat;
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/*
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* Make sure that the first coordinates are the lowest ones.
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*/
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if (rectOvalPtr->bbox[1] > rectOvalPtr->bbox[3]) {
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double tmp;
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tmp = rectOvalPtr->bbox[3];
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rectOvalPtr->bbox[3] = rectOvalPtr->bbox[1];
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rectOvalPtr->bbox[1] = tmp;
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}
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if (rectOvalPtr->bbox[0] > rectOvalPtr->bbox[2]) {
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double tmp;
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tmp = rectOvalPtr->bbox[2];
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rectOvalPtr->bbox[2] = rectOvalPtr->bbox[0];
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rectOvalPtr->bbox[0] = tmp;
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}
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bloat = (rectOvalPtr->width+1)/2 + 1;
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rectOvalPtr->header.x1 = rectOvalPtr->bbox[0] - bloat;
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rectOvalPtr->header.y1 = rectOvalPtr->bbox[1] - bloat;
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rectOvalPtr->header.x2 = rectOvalPtr->bbox[2] + bloat;
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rectOvalPtr->header.y2 = rectOvalPtr->bbox[3] + bloat;
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}
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/*
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*--------------------------------------------------------------
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*
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* DisplayRectOval --
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*
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* This procedure is invoked to draw a rectangle or oval
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* item in a given drawable.
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*
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* Results:
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* None.
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*
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* Side effects:
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* ItemPtr is drawn in drawable using the transformation
|
||
* information in canvasPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayRectOval(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 RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
|
||
Display *display = Tk_Display(canvasPtr->tkwin);
|
||
int x1, y1, x2, y2;
|
||
|
||
/*
|
||
* Compute the screen coordinates of the bounding box for the item.
|
||
* Make sure that the bbox is at least one pixel large, since some
|
||
* X servers will die if it isn't.
|
||
*/
|
||
|
||
x1 = SCREEN_X(canvasPtr, rectOvalPtr->bbox[0]);
|
||
y1 = SCREEN_Y(canvasPtr, rectOvalPtr->bbox[1]);
|
||
x2 = SCREEN_X(canvasPtr, rectOvalPtr->bbox[2]);
|
||
y2 = SCREEN_Y(canvasPtr, rectOvalPtr->bbox[3]);
|
||
if (x2 <= x1) {
|
||
x2 = x1+1;
|
||
}
|
||
if (y2 <= y1) {
|
||
y2 = y1+1;
|
||
}
|
||
|
||
/*
|
||
* Display filled part first (if wanted), then outline. If we're
|
||
* stippling, then 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 (rectOvalPtr->fillGC != None) {
|
||
if (rectOvalPtr->fillStipple != None) {
|
||
XSetTSOrigin(display, rectOvalPtr->fillGC,
|
||
-canvasPtr->drawableXOrigin, -canvasPtr->drawableYOrigin);
|
||
}
|
||
if (rectOvalPtr->header.typePtr == &TkRectangleType) {
|
||
XFillRectangle(display, drawable, rectOvalPtr->fillGC,
|
||
x1, y1, (unsigned int) (x2-x1), (unsigned int) (y2-y1));
|
||
} else {
|
||
XFillArc(display, drawable, rectOvalPtr->fillGC,
|
||
x1, y1, (x2-x1), (y2-y1), 0, 360*64);
|
||
}
|
||
if (rectOvalPtr->fillStipple != None) {
|
||
XSetTSOrigin(display, rectOvalPtr->fillGC, 0, 0);
|
||
}
|
||
}
|
||
if (rectOvalPtr->outlineGC != None) {
|
||
if (rectOvalPtr->header.typePtr == &TkRectangleType) {
|
||
XDrawRectangle(display, drawable, rectOvalPtr->outlineGC,
|
||
x1, y1, (x2-x1), (y2-y1));
|
||
} else {
|
||
XDrawArc(display, drawable, rectOvalPtr->outlineGC,
|
||
x1, y1, (x2-x1), (y2-y1), 0, 360*64);
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* RectToPoint --
|
||
*
|
||
* Computes the distance from a given point to a given
|
||
* rectangle, 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 rectangle. If the
|
||
* point isn't inside the rectangle then the return value is the
|
||
* distance from the point to the rectangle. 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
|
||
RectToPoint(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 RectOvalItem *rectPtr = (RectOvalItem *) itemPtr;
|
||
double xDiff, yDiff, x1, y1, x2, y2, inc, tmp;
|
||
|
||
/*
|
||
* Generate a new larger rectangle that includes the border
|
||
* width, if there is one.
|
||
*/
|
||
|
||
x1 = rectPtr->bbox[0];
|
||
y1 = rectPtr->bbox[1];
|
||
x2 = rectPtr->bbox[2];
|
||
y2 = rectPtr->bbox[3];
|
||
if (rectPtr->outlineGC != None) {
|
||
inc = rectPtr->width/2.0;
|
||
x1 -= inc;
|
||
y1 -= inc;
|
||
x2 += inc;
|
||
y2 += inc;
|
||
}
|
||
|
||
/*
|
||
* If the point is inside the rectangle, handle specially:
|
||
* distance is 0 if rectangle is filled, otherwise compute
|
||
* distance to nearest edge of rectangle and subtract width
|
||
* of edge.
|
||
*/
|
||
|
||
if ((pointPtr[0] >= x1) && (pointPtr[0] < x2)
|
||
&& (pointPtr[1] >= y1) && (pointPtr[1] < y2)) {
|
||
if ((rectPtr->fillGC != None) || (rectPtr->outlineGC == None)) {
|
||
return 0.0;
|
||
}
|
||
xDiff = pointPtr[0] - x1;
|
||
tmp = x2 - pointPtr[0];
|
||
if (tmp < xDiff) {
|
||
xDiff = tmp;
|
||
}
|
||
yDiff = pointPtr[1] - y1;
|
||
tmp = y2 - pointPtr[1];
|
||
if (tmp < yDiff) {
|
||
yDiff = tmp;
|
||
}
|
||
if (yDiff < xDiff) {
|
||
xDiff = yDiff;
|
||
}
|
||
xDiff -= rectPtr->width;
|
||
if (xDiff < 0.0) {
|
||
return 0.0;
|
||
}
|
||
return xDiff;
|
||
}
|
||
|
||
/*
|
||
* Point is outside rectangle.
|
||
*/
|
||
|
||
if (pointPtr[0] < x1) {
|
||
xDiff = x1 - pointPtr[0];
|
||
} else if (pointPtr[0] > x2) {
|
||
xDiff = pointPtr[0] - x2;
|
||
} else {
|
||
xDiff = 0;
|
||
}
|
||
|
||
if (pointPtr[1] < y1) {
|
||
yDiff = y1 - pointPtr[1];
|
||
} else if (pointPtr[1] > y2) {
|
||
yDiff = pointPtr[1] - y2;
|
||
} else {
|
||
yDiff = 0;
|
||
}
|
||
|
||
return hypot(xDiff, yDiff);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* OvalToPoint --
|
||
*
|
||
* Computes the distance from a given point to a given
|
||
* oval, 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 oval. If the
|
||
* point isn't inside the oval then the return value is the
|
||
* distance from the point to the oval. 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
|
||
OvalToPoint(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 RectOvalItem *ovalPtr = (RectOvalItem *) itemPtr;
|
||
double width;
|
||
int filled;
|
||
|
||
width = ovalPtr->width;
|
||
filled = ovalPtr->fillGC != None;
|
||
if (ovalPtr->outlineGC == None) {
|
||
width = 0.0;
|
||
filled = 1;
|
||
}
|
||
return TkOvalToPoint(ovalPtr->bbox, width, filled, pointPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* RectToArea --
|
||
*
|
||
* This procedure is called to determine whether an item
|
||
* lies entirely inside, entirely outside, or overlapping
|
||
* a given rectangle.
|
||
*
|
||
* 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
|
||
RectToArea(canvasPtr, itemPtr, areaPtr)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against rectangle. */
|
||
double *areaPtr; /* Pointer to array of four coordinates
|
||
* (x1, y1, x2, y2) describing rectangular
|
||
* area. */
|
||
{
|
||
register RectOvalItem *rectPtr = (RectOvalItem *) itemPtr;
|
||
double halfWidth;
|
||
|
||
halfWidth = rectPtr->width/2.0;
|
||
if (rectPtr->outlineGC == None) {
|
||
halfWidth = 0.0;
|
||
}
|
||
|
||
if ((areaPtr[2] <= (rectPtr->bbox[0] - halfWidth))
|
||
|| (areaPtr[0] >= (rectPtr->bbox[2] + halfWidth))
|
||
|| (areaPtr[3] <= (rectPtr->bbox[1] - halfWidth))
|
||
|| (areaPtr[1] >= (rectPtr->bbox[3] + halfWidth))) {
|
||
return -1;
|
||
}
|
||
if ((rectPtr->fillGC == None) && (rectPtr->outlineGC != None)
|
||
&& (areaPtr[0] >= (rectPtr->bbox[0] + halfWidth))
|
||
&& (areaPtr[1] >= (rectPtr->bbox[1] + halfWidth))
|
||
&& (areaPtr[2] <= (rectPtr->bbox[2] - halfWidth))
|
||
&& (areaPtr[3] <= (rectPtr->bbox[3] - halfWidth))) {
|
||
return -1;
|
||
}
|
||
if ((areaPtr[0] <= (rectPtr->bbox[0] - halfWidth))
|
||
&& (areaPtr[1] <= (rectPtr->bbox[1] - halfWidth))
|
||
&& (areaPtr[2] >= (rectPtr->bbox[2] + halfWidth))
|
||
&& (areaPtr[3] >= (rectPtr->bbox[3] + halfWidth))) {
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* OvalToArea --
|
||
*
|
||
* This procedure is called to determine whether an item
|
||
* lies entirely inside, entirely outside, or overlapping
|
||
* a given rectangular 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
|
||
OvalToArea(canvasPtr, itemPtr, areaPtr)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against oval. */
|
||
double *areaPtr; /* Pointer to array of four coordinates
|
||
* (x1, y1, x2, y2) describing rectangular
|
||
* area. */
|
||
{
|
||
register RectOvalItem *ovalPtr = (RectOvalItem *) itemPtr;
|
||
double oval[4], halfWidth;
|
||
int result;
|
||
|
||
/*
|
||
* Expand the oval to include the width of the outline, if any.
|
||
*/
|
||
|
||
halfWidth = ovalPtr->width/2.0;
|
||
if (ovalPtr->outlineGC == None) {
|
||
halfWidth = 0.0;
|
||
}
|
||
oval[0] = ovalPtr->bbox[0] - halfWidth;
|
||
oval[1] = ovalPtr->bbox[1] - halfWidth;
|
||
oval[2] = ovalPtr->bbox[2] + halfWidth;
|
||
oval[3] = ovalPtr->bbox[3] + halfWidth;
|
||
|
||
result = TkOvalToArea(oval, areaPtr);
|
||
|
||
/*
|
||
* If the rectangle appears to overlap the oval and the oval
|
||
* isn't filled, do one more check to see if perhaps all four
|
||
* of the rectangle's corners are totally inside the oval's
|
||
* unfilled center, in which case we should return "outside".
|
||
*/
|
||
|
||
if ((result == 0) && (ovalPtr->outlineGC != None)
|
||
&& (ovalPtr->fillGC == None)) {
|
||
double centerX, centerY, width, height;
|
||
double xDelta1, yDelta1, xDelta2, yDelta2;
|
||
|
||
centerX = (ovalPtr->bbox[0] + ovalPtr->bbox[2])/2.0;
|
||
centerY = (ovalPtr->bbox[1] + ovalPtr->bbox[3])/2.0;
|
||
width = (ovalPtr->bbox[2] - ovalPtr->bbox[0])/2.0 - halfWidth;
|
||
height = (ovalPtr->bbox[3] - ovalPtr->bbox[1])/2.0 - halfWidth;
|
||
xDelta1 = (areaPtr[0] - centerX)/width;
|
||
xDelta1 *= xDelta1;
|
||
yDelta1 = (areaPtr[1] - centerY)/height;
|
||
yDelta1 *= yDelta1;
|
||
xDelta2 = (areaPtr[2] - centerX)/width;
|
||
xDelta2 *= xDelta2;
|
||
yDelta2 = (areaPtr[3] - centerY)/height;
|
||
yDelta2 *= yDelta2;
|
||
if (((xDelta1 + yDelta1) < 1.0)
|
||
&& ((xDelta1 + yDelta2) < 1.0)
|
||
&& ((xDelta2 + yDelta1) < 1.0)
|
||
&& ((xDelta2 + yDelta2) < 1.0)) {
|
||
return -1;
|
||
}
|
||
}
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleRectOval --
|
||
*
|
||
* This procedure is invoked to rescale a rectangle or oval
|
||
* item.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The rectangle or oval 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
|
||
ScaleRectOval(canvasPtr, itemPtr, originX, originY, scaleX, scaleY)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing rectangle. */
|
||
Tk_Item *itemPtr; /* Rectangle 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 RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
|
||
|
||
rectOvalPtr->bbox[0] = originX + scaleX*(rectOvalPtr->bbox[0] - originX);
|
||
rectOvalPtr->bbox[1] = originY + scaleY*(rectOvalPtr->bbox[1] - originY);
|
||
rectOvalPtr->bbox[2] = originX + scaleX*(rectOvalPtr->bbox[2] - originX);
|
||
rectOvalPtr->bbox[3] = originY + scaleY*(rectOvalPtr->bbox[3] - originY);
|
||
ComputeRectOvalBbox(canvasPtr, rectOvalPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TranslateRectOval --
|
||
*
|
||
* This procedure is called to move a rectangle or oval by a
|
||
* given amount.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The position of the rectangle or oval is offset by
|
||
* (xDelta, yDelta), and the bounding box is updated in the
|
||
* generic part of the item structure.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
TranslateRectOval(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 RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
|
||
|
||
rectOvalPtr->bbox[0] += deltaX;
|
||
rectOvalPtr->bbox[1] += deltaY;
|
||
rectOvalPtr->bbox[2] += deltaX;
|
||
rectOvalPtr->bbox[3] += deltaY;
|
||
ComputeRectOvalBbox(canvasPtr, rectOvalPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* RectOvalToPostscript --
|
||
*
|
||
* This procedure is called to generate Postscript for
|
||
* rectangle and oval 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
|
||
* rectangle is appended to the result.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
RectOvalToPostscript(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. */
|
||
{
|
||
char pathCmd[500], string[100];
|
||
register RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
|
||
double y1, y2;
|
||
|
||
y1 = TkCanvPsY(psInfoPtr, rectOvalPtr->bbox[1]);
|
||
y2 = TkCanvPsY(psInfoPtr, rectOvalPtr->bbox[3]);
|
||
|
||
/*
|
||
* Generate a string that creates a path for the rectangle or oval.
|
||
* This is the only part of the procedure's code that is type-
|
||
* specific.
|
||
*/
|
||
|
||
|
||
if (rectOvalPtr->header.typePtr == &TkRectangleType) {
|
||
sprintf(pathCmd, "%.15g %.15g moveto %.15g 0 rlineto 0 %.15g rlineto %.15g 0 rlineto closepath\n",
|
||
rectOvalPtr->bbox[0], y1,
|
||
rectOvalPtr->bbox[2]-rectOvalPtr->bbox[0], y2-y1,
|
||
rectOvalPtr->bbox[0]-rectOvalPtr->bbox[2]);
|
||
} else {
|
||
sprintf(pathCmd, "matrix currentmatrix\n%.15g %.15g translate %.15g %.15g scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n",
|
||
(rectOvalPtr->bbox[0] + rectOvalPtr->bbox[2])/2, (y1 + y2)/2,
|
||
(rectOvalPtr->bbox[2] - rectOvalPtr->bbox[0])/2, (y1 - y2)/2);
|
||
}
|
||
|
||
/*
|
||
* First draw the filled area of the rectangle.
|
||
*/
|
||
|
||
if (rectOvalPtr->fillColor != NULL) {
|
||
Tcl_AppendResult(canvasPtr->interp, pathCmd, (char *) NULL);
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, rectOvalPtr->fillColor)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (rectOvalPtr->fillStipple != None) {
|
||
if (TkCanvPsStipple(canvasPtr, psInfoPtr,
|
||
rectOvalPtr->fillStipple, 1) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
} else {
|
||
Tcl_AppendResult(canvasPtr->interp, "fill\n", (char *) NULL);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Now draw the outline, if there is one.
|
||
*/
|
||
|
||
if (rectOvalPtr->outlineColor != NULL) {
|
||
Tcl_AppendResult(canvasPtr->interp, pathCmd, (char *) NULL);
|
||
sprintf(string, "%d setlinewidth", rectOvalPtr->width);
|
||
Tcl_AppendResult(canvasPtr->interp, string,
|
||
" 0 setlinejoin 2 setlinecap\n", (char *) NULL);
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, rectOvalPtr->outlineColor)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
Tcl_AppendResult(canvasPtr->interp, "stroke\n", (char *) NULL);
|
||
}
|
||
return TCL_OK;
|
||
}
|