990 lines
28 KiB
C
990 lines
28 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) 1991-1994 The Regents of the University of California.
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* Copyright (c) 1994 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkCanvPoly.c 1.34 96/02/15 18:52:32
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*/
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#include <stdio.h>
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#include "tkInt.h"
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#include "tkPort.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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int width; /* Width of outline. */
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XColor *outlineColor; /* Color for outline. */
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GC outlineGC; /* Graphics context for drawing outline. */
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XColor *fillColor; /* Foreground color for polygon. */
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Pixmap fillStipple; /* Stipple bitmap for filling polygon. */
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GC fillGC; /* 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_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
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Tk_CanvasTagsPrintProc, (ClientData) NULL
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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, fillColor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(PolygonItem, outlineColor), 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, &tagsOption},
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{TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
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"1", Tk_Offset(PolygonItem, 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 ComputePolygonBbox _ANSI_ARGS_((Tk_Canvas canvas,
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PolygonItem *polyPtr));
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static int ConfigurePolygon _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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char **argv, int flags));
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static int CreatePolygon _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, struct Tk_Item *itemPtr,
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int argc, char **argv));
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static void DeletePolygon _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display));
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static void DisplayPolygon _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display, Drawable dst,
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int x, int y, int width, int height));
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static int PolygonCoords _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr,
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int argc, char **argv));
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static int PolygonToArea _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double *rectPtr));
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static double PolygonToPoint _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double *pointPtr));
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static int PolygonToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
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static void ScalePolygon _ANSI_ARGS_((Tk_Canvas canvas,
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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 canvas,
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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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* 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(interp, canvas, itemPtr, argc, argv)
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Tcl_Interp *interp; /* Interpreter for error reporting. */
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Tk_Canvas canvas; /* 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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PolygonItem *polyPtr = (PolygonItem *) itemPtr;
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int i;
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if (argc < 6) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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Tk_PathName(Tk_CanvasTkwin(canvas)), " 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->width = 1;
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polyPtr->outlineColor = NULL;
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polyPtr->outlineGC = None;
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polyPtr->fillColor = NULL;
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polyPtr->fillStipple = None;
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polyPtr->fillGC = 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(interp, canvas, itemPtr, i, argv) != TCL_OK) {
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goto error;
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}
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if (ConfigurePolygon(interp, canvas, itemPtr, argc-i, argv+i, 0)
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== TCL_OK) {
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return TCL_OK;
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}
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error:
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DeletePolygon(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
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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 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(interp, canvas, itemPtr, argc, argv)
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Tcl_Interp *interp; /* Used for error reporting. */
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Tk_Canvas canvas; /* 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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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(interp, polyPtr->coordPtr[i], buffer);
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Tcl_AppendElement(interp, buffer);
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}
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} else if (argc < 6) {
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Tcl_AppendResult(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(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 = numPoints+1;
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}
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for (i = argc-1; i >= 0; i--) {
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if (Tk_CanvasGetCoord(interp, canvas, argv[i],
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&polyPtr->coordPtr[i]) != TCL_OK) {
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return TCL_ERROR;
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}
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}
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polyPtr->numPoints = numPoints;
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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(canvas, 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 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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ConfigurePolygon(interp, canvas, itemPtr, argc, argv, flags)
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Tcl_Interp *interp; /* Interpreter for error reporting. */
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Tk_Canvas canvas; /* Canvas containing itemPtr. */
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Tk_Item *itemPtr; /* Polygon 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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PolygonItem *polyPtr = (PolygonItem *) itemPtr;
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XGCValues gcValues;
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GC newGC;
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unsigned long mask;
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Tk_Window tkwin;
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tkwin = Tk_CanvasTkwin(canvas);
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if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv,
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(char *) polyPtr, 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 (polyPtr->width < 1) {
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polyPtr->width = 1;
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}
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if (polyPtr->outlineColor == NULL) {
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newGC = None;
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} else {
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gcValues.foreground = polyPtr->outlineColor->pixel;
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gcValues.line_width = polyPtr->width;
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gcValues.cap_style = CapRound;
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gcValues.join_style = JoinRound;
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mask = GCForeground|GCLineWidth|GCCapStyle|GCJoinStyle;
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newGC = Tk_GetGC(tkwin, mask, &gcValues);
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}
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if (polyPtr->outlineGC != None) {
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Tk_FreeGC(Tk_Display(tkwin), polyPtr->outlineGC);
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}
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polyPtr->outlineGC = newGC;
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if (polyPtr->fillColor == NULL) {
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newGC = None;
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} else {
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gcValues.foreground = polyPtr->fillColor->pixel;
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mask = GCForeground;
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if (polyPtr->fillStipple != None) {
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gcValues.stipple = polyPtr->fillStipple;
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gcValues.fill_style = FillStippled;
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mask |= GCStipple|GCFillStyle;
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}
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newGC = Tk_GetGC(tkwin, mask, &gcValues);
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}
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if (polyPtr->fillGC != None) {
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Tk_FreeGC(Tk_Display(tkwin), polyPtr->fillGC);
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}
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polyPtr->fillGC = newGC;
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/*
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* Keep spline parameters within reasonable limits.
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*/
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if (polyPtr->splineSteps < 1) {
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polyPtr->splineSteps = 1;
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} else if (polyPtr->splineSteps > 100) {
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polyPtr->splineSteps = 100;
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}
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ComputePolygonBbox(canvas, polyPtr);
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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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* DeletePolygon --
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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 polygon 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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DeletePolygon(canvas, itemPtr, display)
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Tk_Canvas canvas; /* Info about overall canvas widget. */
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Tk_Item *itemPtr; /* Item that is being deleted. */
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Display *display; /* Display containing window for
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* canvas. */
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{
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PolygonItem *polyPtr = (PolygonItem *) itemPtr;
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if (polyPtr->coordPtr != NULL) {
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ckfree((char *) polyPtr->coordPtr);
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}
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if (polyPtr->fillColor != NULL) {
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Tk_FreeColor(polyPtr->fillColor);
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}
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if (polyPtr->fillStipple != None) {
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Tk_FreeBitmap(display, polyPtr->fillStipple);
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}
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if (polyPtr->outlineColor != NULL) {
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Tk_FreeColor(polyPtr->outlineColor);
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}
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if (polyPtr->outlineGC != None) {
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Tk_FreeGC(display, polyPtr->outlineGC);
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}
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if (polyPtr->fillGC != None) {
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Tk_FreeGC(display, polyPtr->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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* ComputePolygonBbox --
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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 polygon.
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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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static void
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ComputePolygonBbox(canvas, polyPtr)
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Tk_Canvas canvas; /* Canvas that contains item. */
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PolygonItem *polyPtr; /* Item whose bbox is to be
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* recomputed. */
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{
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double *coordPtr;
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int i;
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coordPtr = polyPtr->coordPtr;
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polyPtr->header.x1 = polyPtr->header.x2 = *coordPtr;
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polyPtr->header.y1 = polyPtr->header.y2 = coordPtr[1];
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for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints;
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i++, coordPtr += 2) {
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TkIncludePoint((Tk_Item *) polyPtr, coordPtr);
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}
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/*
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* Expand bounding box in all directions to account for the outline,
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* which can stick out beyond the polygon. Add one extra pixel of
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* fudge, just in case X rounds differently than we do.
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*/
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i = (polyPtr->width+1)/2 + 1;
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polyPtr->header.x1 -= i;
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polyPtr->header.x2 += i;
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polyPtr->header.y1 -= i;
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polyPtr->header.y2 += i;
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}
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/*
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*--------------------------------------------------------------
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*
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* TkFillPolygon --
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*
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* This procedure is invoked to convert a polygon to screen
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* coordinates and display it using a particular GC.
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*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* ItemPtr is drawn in drawable using the transformation
|
||
* information in canvas.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkFillPolygon(canvas, coordPtr, numPoints, display, drawable, gc, outlineGC)
|
||
Tk_Canvas canvas; /* 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. */
|
||
Display *display; /* Display on which to draw polygon. */
|
||
Drawable drawable; /* Pixmap or window in which to draw
|
||
* polygon. */
|
||
GC gc; /* Graphics context for drawing. */
|
||
GC outlineGC; /* If not None, use this to draw an
|
||
* outline around the polygon after
|
||
* filling it. */
|
||
{
|
||
XPoint staticPoints[MAX_STATIC_POINTS];
|
||
XPoint *pointPtr;
|
||
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++) {
|
||
Tk_CanvasDrawableCoords(canvas, coordPtr[0], coordPtr[1], &pPtr->x,
|
||
&pPtr->y);
|
||
}
|
||
|
||
/*
|
||
* Display polygon, then free up polygon storage if it was dynamically
|
||
* allocated.
|
||
*/
|
||
|
||
if (gc != None) {
|
||
XFillPolygon(display, drawable, gc, pointPtr, numPoints, Complex,
|
||
CoordModeOrigin);
|
||
}
|
||
if (outlineGC != None) {
|
||
XDrawLines(display, drawable, outlineGC, pointPtr,
|
||
numPoints, 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 canvas.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayPolygon(canvas, itemPtr, display, drawable, x, y, width, height)
|
||
Tk_Canvas canvas; /* Canvas that contains item. */
|
||
Tk_Item *itemPtr; /* Item to be displayed. */
|
||
Display *display; /* Display on which to draw item. */
|
||
Drawable drawable; /* Pixmap or window in which to draw
|
||
* item. */
|
||
int x, y, width, height; /* Describes region of canvas that
|
||
* must be redisplayed (not used). */
|
||
{
|
||
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
|
||
if ((polyPtr->fillGC == None) && (polyPtr->outlineGC == 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) && (polyPtr->fillGC != None)) {
|
||
Tk_CanvasSetStippleOrigin(canvas, polyPtr->fillGC);
|
||
}
|
||
|
||
if (!polyPtr->smooth) {
|
||
TkFillPolygon(canvas, polyPtr->coordPtr, polyPtr->numPoints,
|
||
display, drawable, polyPtr->fillGC, polyPtr->outlineGC);
|
||
} 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(canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints, polyPtr->splineSteps, pointPtr,
|
||
(double *) NULL);
|
||
if (polyPtr->fillGC != None) {
|
||
XFillPolygon(display, drawable, polyPtr->fillGC, pointPtr,
|
||
numPoints, Complex, CoordModeOrigin);
|
||
}
|
||
if (polyPtr->outlineGC != None) {
|
||
XDrawLines(display, drawable, polyPtr->outlineGC, pointPtr,
|
||
numPoints, CoordModeOrigin);
|
||
}
|
||
if (pointPtr != staticPoints) {
|
||
ckfree((char *) pointPtr);
|
||
}
|
||
}
|
||
if ((polyPtr->fillStipple != None) && (polyPtr->fillGC != None)) {
|
||
XSetTSOrigin(display, polyPtr->fillGC, 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(canvas, itemPtr, pointPtr)
|
||
Tk_Canvas canvas; /* 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) {
|
||
distance = TkPolygonToPoint(polyPtr->coordPtr, polyPtr->numPoints,
|
||
pointPtr);
|
||
} else {
|
||
/*
|
||
* 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(canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
|
||
coordPtr);
|
||
distance = TkPolygonToPoint(coordPtr, numPoints, pointPtr);
|
||
if (coordPtr != staticSpace) {
|
||
ckfree((char *) coordPtr);
|
||
}
|
||
}
|
||
if (polyPtr->outlineColor != NULL) {
|
||
distance -= polyPtr->width/2.0;
|
||
if (distance < 0) {
|
||
distance = 0;
|
||
}
|
||
}
|
||
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(canvas, itemPtr, rectPtr)
|
||
Tk_Canvas canvas; /* 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, rect2[4], halfWidth;
|
||
double staticSpace[2*MAX_STATIC_POINTS];
|
||
int numPoints, result;
|
||
|
||
/*
|
||
* Handle smoothed polygons by generating an expanded set of points
|
||
* against which to do the check.
|
||
*/
|
||
|
||
if (polyPtr->smooth) {
|
||
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
||
if (numPoints <= MAX_STATIC_POINTS) {
|
||
coordPtr = staticSpace;
|
||
} else {
|
||
coordPtr = (double *) ckalloc((unsigned)
|
||
(2*numPoints*sizeof(double)));
|
||
}
|
||
numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
|
||
coordPtr);
|
||
} else {
|
||
numPoints = polyPtr->numPoints;
|
||
coordPtr = polyPtr->coordPtr;
|
||
}
|
||
|
||
if (polyPtr->width <= 1) {
|
||
/*
|
||
* The outline of the polygon doesn't stick out, so we can
|
||
* do a simple check.
|
||
*/
|
||
|
||
result = TkPolygonToArea(coordPtr, numPoints, rectPtr);
|
||
} else {
|
||
/*
|
||
* The polygon has a wide outline, so the check is more complicated.
|
||
* First, check the line segments to see if they overlap the area.
|
||
*/
|
||
|
||
result = TkThickPolyLineToArea(coordPtr, numPoints,
|
||
(double) polyPtr->width, CapRound, JoinRound, rectPtr);
|
||
if (result >= 0) {
|
||
goto done;
|
||
}
|
||
|
||
/*
|
||
* There is no overlap between the polygon's outline and the
|
||
* rectangle. This means either the rectangle is entirely outside
|
||
* the polygon or entirely inside. To tell the difference,
|
||
* see whether the polygon (with 0 outline width) overlaps the
|
||
* rectangle bloated by half the outline width.
|
||
*/
|
||
|
||
halfWidth = polyPtr->width/2.0;
|
||
rect2[0] = rectPtr[0] - halfWidth;
|
||
rect2[1] = rectPtr[1] - halfWidth;
|
||
rect2[2] = rectPtr[2] + halfWidth;
|
||
rect2[3] = rectPtr[3] + halfWidth;
|
||
if (TkPolygonToArea(coordPtr, numPoints, rect2) == -1) {
|
||
result = -1;
|
||
} else {
|
||
result = 0;
|
||
}
|
||
}
|
||
|
||
done:
|
||
if ((coordPtr != staticSpace) && (coordPtr != polyPtr->coordPtr)) {
|
||
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(canvas, itemPtr, originX, originY, scaleX, scaleY)
|
||
Tk_Canvas canvas; /* 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;
|
||
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(canvas, 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(canvas, itemPtr, deltaX, deltaY)
|
||
Tk_Canvas canvas; /* 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;
|
||
double *coordPtr;
|
||
int i;
|
||
|
||
for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
|
||
i++, coordPtr += 2) {
|
||
*coordPtr += deltaX;
|
||
coordPtr[1] += deltaY;
|
||
}
|
||
ComputePolygonBbox(canvas, 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 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(interp, canvas, itemPtr, prepass)
|
||
Tcl_Interp *interp; /* Leave Postscript or error message
|
||
* here. */
|
||
Tk_Canvas canvas; /* Information about overall canvas. */
|
||
Tk_Item *itemPtr; /* Item for which Postscript is
|
||
* wanted. */
|
||
int prepass; /* 1 means this is a prepass to
|
||
* collect font information; 0 means
|
||
* final Postscript is being created. */
|
||
{
|
||
char string[100];
|
||
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
||
|
||
/*
|
||
* Fill the area of the polygon.
|
||
*/
|
||
|
||
if (polyPtr->fillColor != NULL) {
|
||
if (!polyPtr->smooth) {
|
||
Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints);
|
||
} else {
|
||
TkMakeBezierPostscript(interp, canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints);
|
||
}
|
||
if (Tk_CanvasPsColor(interp, canvas, polyPtr->fillColor) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (polyPtr->fillStipple != None) {
|
||
Tcl_AppendResult(interp, "eoclip ", (char *) NULL);
|
||
if (Tk_CanvasPsStipple(interp, canvas, polyPtr->fillStipple)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (polyPtr->outlineColor != NULL) {
|
||
Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL);
|
||
}
|
||
} else {
|
||
Tcl_AppendResult(interp, "eofill\n", (char *) NULL);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Now draw the outline, if there is one.
|
||
*/
|
||
|
||
if (polyPtr->outlineColor != NULL) {
|
||
if (!polyPtr->smooth) {
|
||
Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints);
|
||
} else {
|
||
TkMakeBezierPostscript(interp, canvas, polyPtr->coordPtr,
|
||
polyPtr->numPoints);
|
||
}
|
||
|
||
sprintf(string, "%d setlinewidth\n", polyPtr->width);
|
||
Tcl_AppendResult(interp, string,
|
||
"1 setlinecap\n1 setlinejoin\n", (char *) NULL);
|
||
if (Tk_CanvasPsColor(interp, canvas, polyPtr->outlineColor)
|
||
!= TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
Tcl_AppendResult(interp, "stroke\n", (char *) NULL);
|
||
}
|
||
return TCL_OK;
|
||
}
|