869 lines
25 KiB
C
869 lines
25 KiB
C
/*
|
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* tkCanvPoly.c --
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*
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* This file implements polygon items for canvas 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/tkCanvPoly.c,v 1.17 93/09/15 08:19:50 ouster Exp $ SPRITE (Berkeley)";
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#endif
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#include <stdio.h>
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#include "tkInt.h"
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#include "tkCanvas.h"
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#include "tkConfig.h"
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/*
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* The structure below defines the record for each polygon item.
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*/
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typedef struct PolygonItem {
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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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int numPoints; /* Number of points in polygon (always >= 3).
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* Polygon is always closed. */
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int pointsAllocated; /* Number of points for which space is
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* allocated at *coordPtr. */
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double *coordPtr; /* Pointer to malloc-ed array containing
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* x- and y-coords of all points in polygon.
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* X-coords are even-valued indices, y-coords
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* are corresponding odd-valued indices. */
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XColor *fg; /* Foreground color for polygon. */
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Pixmap fillStipple; /* Stipple bitmap for filling polygon. */
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GC gc; /* Graphics context for filling polygon. */
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int smooth; /* Non-zero means draw shape smoothed (i.e.
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* with Bezier splines). */
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int splineSteps; /* Number of steps in each spline segment. */
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} PolygonItem;
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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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"black", Tk_Offset(PolygonItem, fg), TK_CONFIG_NULL_OK},
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{TK_CONFIG_BOOLEAN, "-smooth", (char *) NULL, (char *) NULL,
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"0", Tk_Offset(PolygonItem, smooth), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL,
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"12", Tk_Offset(PolygonItem, splineSteps), 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(PolygonItem, 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_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 ComputePolygonBbox _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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PolygonItem *polyPtr));
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static int ConfigurePolygon _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 CreatePolygon _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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struct Tk_Item *itemPtr, int argc, char **argv));
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static void DeletePolygon _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr));
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static void DisplayPolygon _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Drawable dst));
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static int PolygonCoords _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int argc, char **argv));
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static int PolygonToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *rectPtr));
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static double PolygonToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *pointPtr));
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static int PolygonToPostscript _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Tk_PostscriptInfo *psInfoPtr));
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static void ScalePolygon _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 TranslatePolygon _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 polygon item type by means
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* of procedures that can be invoked by generic item code.
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*/
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Tk_ItemType TkPolygonType = {
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"polygon", /* name */
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sizeof(PolygonItem), /* itemSize */
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CreatePolygon, /* createProc */
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configSpecs, /* configSpecs */
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ConfigurePolygon, /* configureProc */
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PolygonCoords, /* coordProc */
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DeletePolygon, /* deleteProc */
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DisplayPolygon, /* displayProc */
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0, /* alwaysRedraw */
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PolygonToPoint, /* pointProc */
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PolygonToArea, /* areaProc */
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PolygonToPostscript, /* postscriptProc */
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ScalePolygon, /* scaleProc */
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TranslatePolygon, /* 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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/*
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* The definition below determines how large are static arrays
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* used to hold spline points (splines larger than this have to
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* have their arrays malloc-ed).
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*/
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#define MAX_STATIC_POINTS 200
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/*
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*--------------------------------------------------------------
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*
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* CreatePolygon --
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*
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* This procedure is invoked to create a new polygon 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 polygon 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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CreatePolygon(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 polygon. */
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{
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register PolygonItem *polyPtr = (PolygonItem *) itemPtr;
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int i;
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if (argc < 6) {
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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,
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" x1 y1 x2 y2 x3 y3 ?x4 y4 ...? ?options?", (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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polyPtr->numPoints = 0;
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polyPtr->pointsAllocated = 0;
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polyPtr->coordPtr = NULL;
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polyPtr->fg = None;
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polyPtr->fillStipple = None;
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polyPtr->gc = None;
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polyPtr->smooth = 0;
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polyPtr->splineSteps = 12;
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/*
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* Count the number of points and then parse them into a point
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* array. Leading arguments are assumed to be points if they
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* start with a digit or a minus sign followed by a digit.
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*/
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for (i = 4; i < (argc-1); i+=2) {
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if ((!isdigit(UCHAR(argv[i][0]))) &&
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((argv[i][0] != '-') || (!isdigit(UCHAR(argv[i][1]))))) {
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break;
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}
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}
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if (PolygonCoords(canvasPtr, itemPtr, i, argv) != TCL_OK) {
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goto error;
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}
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if (ConfigurePolygon(canvasPtr, itemPtr, argc-i, argv+i, 0) == TCL_OK) {
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return TCL_OK;
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}
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error:
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DeletePolygon(canvasPtr, itemPtr);
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return TCL_ERROR;
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}
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/*
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*--------------------------------------------------------------
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*
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* PolygonCoords --
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*
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* This procedure is invoked to process the "coords" widget
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* command on polygons. 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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PolygonCoords(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 PolygonItem *polyPtr = (PolygonItem *) itemPtr;
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char buffer[TCL_DOUBLE_SPACE];
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int i, numPoints;
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if (argc == 0) {
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for (i = 0; i < 2*polyPtr->numPoints; i++) {
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Tcl_PrintDouble(canvasPtr->interp, polyPtr->coordPtr[i], buffer);
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Tcl_AppendElement(canvasPtr->interp, buffer);
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}
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} else if (argc < 6) {
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Tcl_AppendResult(canvasPtr->interp,
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"too few coordinates for polygon: must have at least 6",
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(char *) NULL);
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return TCL_ERROR;
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} else if (argc & 1) {
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Tcl_AppendResult(canvasPtr->interp,
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"odd number of coordinates specified for polygon",
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(char *) NULL);
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return TCL_ERROR;
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} else {
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numPoints = argc/2;
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if (polyPtr->pointsAllocated <= numPoints) {
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if (polyPtr->coordPtr != NULL) {
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ckfree((char *) polyPtr->coordPtr);
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}
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/*
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* One extra point gets allocated here, just in case we have
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* to add another point to close the polygon.
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*/
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polyPtr->coordPtr = (double *) ckalloc((unsigned)
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(sizeof(double) * (argc+2)));
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polyPtr->pointsAllocated = polyPtr->numPoints = numPoints;
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}
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for (i = argc-1; i >= 0; i--) {
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if (TkGetCanvasCoord(canvasPtr, argv[i], &polyPtr->coordPtr[i])
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!= TCL_OK) {
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return TCL_ERROR;
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}
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}
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/*
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* Close the polygon if it isn't already closed.
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*/
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if ((polyPtr->coordPtr[argc-2] != polyPtr->coordPtr[0])
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|| (polyPtr->coordPtr[argc-1] != polyPtr->coordPtr[1])) {
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polyPtr->numPoints++;
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||
polyPtr->coordPtr[argc] = polyPtr->coordPtr[0];
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polyPtr->coordPtr[argc+1] = polyPtr->coordPtr[1];
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}
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ComputePolygonBbox(canvasPtr, polyPtr);
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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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* ConfigurePolygon --
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*
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* This procedure is invoked to configure various aspects
|
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* of a polygon item such as its background color.
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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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* 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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static int
|
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ConfigurePolygon(canvasPtr, itemPtr, argc, argv, flags)
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Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */
|
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Tk_Item *itemPtr; /* Polygon item to reconfigure. */
|
||
int argc; /* Number of elements in argv. */
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char **argv; /* Arguments describing things to configure. */
|
||
int flags; /* Flags to pass to Tk_ConfigureWidget. */
|
||
{
|
||
register PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
XGCValues gcValues;
|
||
GC newGC;
|
||
unsigned long mask;
|
||
|
||
if (Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
|
||
configSpecs, argc, argv, (char *) polyPtr, flags) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* A few of the options require additional processing, such as
|
||
* graphics contexts.
|
||
*/
|
||
|
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if (polyPtr->fg == NULL) {
|
||
newGC = None;
|
||
} else {
|
||
gcValues.foreground = polyPtr->fg->pixel;
|
||
mask = GCForeground;
|
||
if (polyPtr->fillStipple != None) {
|
||
gcValues.stipple = polyPtr->fillStipple;
|
||
gcValues.fill_style = FillStippled;
|
||
mask |= GCStipple|GCFillStyle;
|
||
}
|
||
newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
|
||
}
|
||
if (polyPtr->gc != None) {
|
||
Tk_FreeGC(canvasPtr->display, polyPtr->gc);
|
||
}
|
||
polyPtr->gc = newGC;
|
||
|
||
/*
|
||
* Keep spline parameters within reasonable limits.
|
||
*/
|
||
|
||
if (polyPtr->splineSteps < 1) {
|
||
polyPtr->splineSteps = 1;
|
||
} else if (polyPtr->splineSteps > 100) {
|
||
polyPtr->splineSteps = 100;
|
||
}
|
||
|
||
ComputePolygonBbox(canvasPtr, polyPtr);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DeletePolygon --
|
||
*
|
||
* This procedure is called to clean up the data structure
|
||
* associated with a polygon item.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Resources associated with itemPtr are released.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DeletePolygon(canvasPtr, itemPtr)
|
||
Tk_Canvas *canvasPtr; /* Info about overall canvas widget. */
|
||
Tk_Item *itemPtr; /* Item that is being deleted. */
|
||
{
|
||
register PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
|
||
if (polyPtr->coordPtr != NULL) {
|
||
ckfree((char *) polyPtr->coordPtr);
|
||
}
|
||
if (polyPtr->fg != NULL) {
|
||
Tk_FreeColor(polyPtr->fg);
|
||
}
|
||
if (polyPtr->fillStipple != None) {
|
||
Tk_FreeBitmap(canvasPtr->display, polyPtr->fillStipple);
|
||
}
|
||
if (polyPtr->gc != None) {
|
||
Tk_FreeGC(canvasPtr->display, polyPtr->gc);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ComputePolygonBbox --
|
||
*
|
||
* This procedure is invoked to compute the bounding box of
|
||
* all the pixels that may be drawn as part of a polygon.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The fields x1, y1, x2, and y2 are updated in the header
|
||
* for itemPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ComputePolygonBbox(canvasPtr, polyPtr)
|
||
register Tk_Canvas *canvasPtr; /* Canvas that contains item. */
|
||
PolygonItem *polyPtr; /* Item whose bbox is to be
|
||
* recomputed. */
|
||
{
|
||
register double *coordPtr;
|
||
int i;
|
||
|
||
coordPtr = polyPtr->coordPtr;
|
||
polyPtr->header.x1 = polyPtr->header.x2 = *coordPtr;
|
||
polyPtr->header.y1 = polyPtr->header.y2 = coordPtr[1];
|
||
|
||
for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints;
|
||
i++, coordPtr += 2) {
|
||
TkIncludePoint(canvasPtr, (Tk_Item *) polyPtr, coordPtr);
|
||
}
|
||
|
||
/*
|
||
* Add one more pixel of fudge factor just to be safe (e.g.
|
||
* X may round differently than we do).
|
||
*/
|
||
|
||
polyPtr->header.x1 -= 1;
|
||
polyPtr->header.x2 += 1;
|
||
polyPtr->header.y1 -= 1;
|
||
polyPtr->header.y2 += 1;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkFillPolygon --
|
||
*
|
||
* This procedure is invoked to convert a polygon to screen
|
||
* coordinates and display it using a particular GC.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* ItemPtr is drawn in drawable using the transformation
|
||
* information in canvasPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkFillPolygon(canvasPtr, coordPtr, numPoints, drawable, gc)
|
||
register Tk_Canvas *canvasPtr; /* Canvas whose coordinate system
|
||
* is to be used for drawing. */
|
||
double *coordPtr; /* Array of coordinates for polygon:
|
||
* x1, y1, x2, y2, .... */
|
||
int numPoints; /* Twice this many coordinates are
|
||
* present at *coordPtr. */
|
||
Drawable drawable; /* Pixmap or window in which to draw
|
||
* polygon. */
|
||
GC gc; /* Graphics context for drawing. */
|
||
{
|
||
XPoint staticPoints[MAX_STATIC_POINTS];
|
||
XPoint *pointPtr;
|
||
register XPoint *pPtr;
|
||
int i;
|
||
|
||
/*
|
||
* Build up an array of points in screen coordinates. Use a
|
||
* static array unless the polygon has an enormous number of points;
|
||
* in this case, dynamically allocate an array.
|
||
*/
|
||
|
||
if (numPoints <= MAX_STATIC_POINTS) {
|
||
pointPtr = staticPoints;
|
||
} else {
|
||
pointPtr = (XPoint *) ckalloc((unsigned) (numPoints * sizeof(XPoint)));
|
||
}
|
||
|
||
for (i = 0, pPtr = pointPtr; i < numPoints; i += 1, coordPtr += 2, pPtr++) {
|
||
pPtr->x = SCREEN_X(canvasPtr, coordPtr[0]);
|
||
pPtr->y = SCREEN_Y(canvasPtr, coordPtr[1]);
|
||
}
|
||
|
||
/*
|
||
* Display polygon, then free up polygon storage if it was dynamically
|
||
* allocated.
|
||
*/
|
||
|
||
XFillPolygon(Tk_Display(canvasPtr->tkwin), drawable, gc, pointPtr,
|
||
numPoints, Complex, CoordModeOrigin);
|
||
if (pointPtr != staticPoints) {
|
||
ckfree((char *) pointPtr);
|
||
}
|
||
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DisplayPolygon --
|
||
*
|
||
* This procedure is invoked to draw a polygon item in a given
|
||
* drawable.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* ItemPtr is drawn in drawable using the transformation
|
||
* information in canvasPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayPolygon(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 PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
|
||
if (polyPtr->gc == None) {
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* 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 (polyPtr->fillStipple != None) {
|
||
XSetTSOrigin(Tk_Display(canvasPtr->tkwin), polyPtr->gc,
|
||
-canvasPtr->drawableXOrigin, -canvasPtr->drawableYOrigin);
|
||
}
|
||
|
||
if (!polyPtr->smooth) {
|
||
TkFillPolygon(canvasPtr, polyPtr->coordPtr, polyPtr->numPoints,
|
||
drawable, polyPtr->gc);
|
||
} else {
|
||
int numPoints;
|
||
XPoint staticPoints[MAX_STATIC_POINTS];
|
||
XPoint *pointPtr;
|
||
|
||
/*
|
||
* This is a smoothed polygon. Display using a set of generated
|
||
* spline points rather than the original points.
|
||
*/
|
||
|
||
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
||
if (numPoints <= MAX_STATIC_POINTS) {
|
||
pointPtr = staticPoints;
|
||
} else {
|
||
pointPtr = (XPoint *) ckalloc((unsigned)
|
||
(numPoints * sizeof(XPoint)));
|
||
}
|
||
numPoints = TkMakeBezierCurve(canvasPtr, polyPtr->coordPtr,
|
||
polyPtr->numPoints, polyPtr->splineSteps, pointPtr,
|
||
(double *) NULL);
|
||
XFillPolygon(Tk_Display(canvasPtr->tkwin), drawable, polyPtr->gc,
|
||
pointPtr, numPoints, Complex, CoordModeOrigin);
|
||
if (pointPtr != staticPoints) {
|
||
ckfree((char *) pointPtr);
|
||
}
|
||
}
|
||
if (polyPtr->fillStipple != None) {
|
||
XSetTSOrigin(Tk_Display(canvasPtr->tkwin), polyPtr->gc, 0, 0);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* PolygonToPoint --
|
||
*
|
||
* Computes the distance from a given point to a given
|
||
* polygon, in canvas units.
|
||
*
|
||
* Results:
|
||
* The return value is 0 if the point whose x and y coordinates
|
||
* are pointPtr[0] and pointPtr[1] is inside the polygon. If the
|
||
* point isn't inside the polygon then the return value is the
|
||
* distance from the point to the polygon.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static double
|
||
PolygonToPoint(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. */
|
||
{
|
||
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
double *coordPtr, distance;
|
||
double staticSpace[2*MAX_STATIC_POINTS];
|
||
int numPoints;
|
||
|
||
if (!polyPtr->smooth) {
|
||
return TkPolygonToPoint(polyPtr->coordPtr, polyPtr->numPoints,
|
||
pointPtr);
|
||
}
|
||
|
||
/*
|
||
* Smoothed polygon. Generate a new set of points and use them
|
||
* for comparison.
|
||
*/
|
||
|
||
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
||
if (numPoints <= MAX_STATIC_POINTS) {
|
||
coordPtr = staticSpace;
|
||
} else {
|
||
coordPtr = (double *) ckalloc((unsigned)
|
||
(2*numPoints*sizeof(double)));
|
||
}
|
||
numPoints = TkMakeBezierCurve(canvasPtr, polyPtr->coordPtr,
|
||
polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
|
||
coordPtr);
|
||
distance = TkPolygonToPoint(coordPtr, numPoints, pointPtr);
|
||
if (coordPtr != staticSpace) {
|
||
ckfree((char *) coordPtr);
|
||
}
|
||
return distance;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* PolygonToArea --
|
||
*
|
||
* 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
|
||
PolygonToArea(canvasPtr, itemPtr, rectPtr)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against polygon. */
|
||
double *rectPtr; /* Pointer to array of four coordinates
|
||
* (x1, y1, x2, y2) describing rectangular
|
||
* area. */
|
||
{
|
||
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
double *coordPtr;
|
||
double staticSpace[2*MAX_STATIC_POINTS];
|
||
int numPoints, result;
|
||
|
||
if (!polyPtr->smooth) {
|
||
return TkPolygonToArea(polyPtr->coordPtr, polyPtr->numPoints, rectPtr);
|
||
}
|
||
|
||
/*
|
||
* Smoothed polygon. Generate a new set of points and use them
|
||
* for comparison.
|
||
*/
|
||
|
||
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
||
if (numPoints <= MAX_STATIC_POINTS) {
|
||
coordPtr = staticSpace;
|
||
} else {
|
||
coordPtr = (double *) ckalloc((unsigned)
|
||
(2*numPoints*sizeof(double)));
|
||
}
|
||
numPoints = TkMakeBezierCurve(canvasPtr, polyPtr->coordPtr,
|
||
polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
|
||
coordPtr);
|
||
result = TkPolygonToArea(coordPtr, numPoints, rectPtr);
|
||
if (coordPtr != staticSpace) {
|
||
ckfree((char *) coordPtr);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScalePolygon --
|
||
*
|
||
* This procedure is invoked to rescale a polygon item.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The polygon 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
|
||
ScalePolygon(canvasPtr, itemPtr, originX, originY, scaleX, scaleY)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing polygon. */
|
||
Tk_Item *itemPtr; /* Polygon 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. */
|
||
{
|
||
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
register double *coordPtr;
|
||
int i;
|
||
|
||
for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
|
||
i++, coordPtr += 2) {
|
||
*coordPtr = originX + scaleX*(*coordPtr - originX);
|
||
coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
|
||
}
|
||
ComputePolygonBbox(canvasPtr, polyPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TranslatePolygon --
|
||
*
|
||
* This procedure is called to move a polygon by a given
|
||
* amount.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The position of the polygon is offset by (xDelta, yDelta),
|
||
* and the bounding box is updated in the generic part of the
|
||
* item structure.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
TranslatePolygon(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. */
|
||
{
|
||
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
register double *coordPtr;
|
||
int i;
|
||
|
||
for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
|
||
i++, coordPtr += 2) {
|
||
*coordPtr += deltaX;
|
||
coordPtr[1] += deltaY;
|
||
}
|
||
ComputePolygonBbox(canvasPtr, polyPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* PolygonToPostscript --
|
||
*
|
||
* This procedure is called to generate Postscript for
|
||
* polygon 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
|
||
PolygonToPostscript(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 PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
|
||
if (polyPtr->fg == NULL) {
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* Generate a path for the polygon's outline (do this differently
|
||
* for smoothed and linear polygons).
|
||
*/
|
||
|
||
if (!polyPtr->smooth) {
|
||
TkCanvPsPath(canvasPtr->interp, polyPtr->coordPtr,
|
||
polyPtr->numPoints, psInfoPtr);
|
||
} else {
|
||
TkMakeBezierPostscript(canvasPtr->interp, polyPtr->coordPtr,
|
||
polyPtr->numPoints, psInfoPtr);
|
||
}
|
||
|
||
/*
|
||
* Fill the area of the polygon.
|
||
*/
|
||
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, polyPtr->fg) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
};
|
||
if (polyPtr->fillStipple != None) {
|
||
if (TkCanvPsStipple(canvasPtr, psInfoPtr, polyPtr->fillStipple, 1)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
} else {
|
||
Tcl_AppendResult(canvasPtr->interp, "eofill\n", (char *) NULL);
|
||
}
|
||
return TCL_OK;
|
||
}
|