tkCanvPoly.c
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- /*
- * tkCanvPoly.c --
- *
- * This file implements polygon items for canvas widgets.
- *
- * Copyright (c) 1991-1994 The Regents of the University of California.
- * Copyright (c) 1994-1997 Sun Microsystems, Inc.
- * Copyright (c) 1998-2000 Ajuba Solutions.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tkCanvPoly.c,v 1.10.2.3 2006/10/16 15:35:50 das Exp $
- */
- #include <stdio.h>
- #include "tkInt.h"
- #include "tkPort.h"
- #include "tkCanvas.h"
- /*
- * The structure below defines the record for each polygon item.
- */
- typedef struct PolygonItem {
- Tk_Item header; /* Generic stuff that's the same for all
- * types. MUST BE FIRST IN STRUCTURE. */
- Tk_Outline outline; /* Outline structure */
- int numPoints; /* Number of points in polygon.
- * Polygon is always closed. */
- int pointsAllocated; /* Number of points for which space is
- * allocated at *coordPtr. */
- double *coordPtr; /* Pointer to malloc-ed array containing
- * x- and y-coords of all points in polygon.
- * X-coords are even-valued indices, y-coords
- * are corresponding odd-valued indices. */
- int joinStyle; /* Join style for outline */
- Tk_TSOffset tsoffset;
- XColor *fillColor; /* Foreground color for polygon. */
- XColor *activeFillColor; /* Foreground color for polygon if state is active. */
- XColor *disabledFillColor; /* Foreground color for polygon if state is disabled. */
- Pixmap fillStipple; /* Stipple bitmap for filling polygon. */
- Pixmap activeFillStipple; /* Stipple bitmap for filling polygon if state is active. */
- Pixmap disabledFillStipple; /* Stipple bitmap for filling polygon if state is disabled. */
- GC fillGC; /* Graphics context for filling polygon. */
- Tk_SmoothMethod *smooth; /* Non-zero means draw shape smoothed (i.e.
- * with Bezier splines). */
- int splineSteps; /* Number of steps in each spline segment. */
- int autoClosed; /* Zero means the given polygon was closed,
- one means that we auto closed it. */
- } PolygonItem;
- /*
- * Information used for parsing configuration specs:
- */
- static Tk_CustomOption smoothOption = {
- (Tk_OptionParseProc *) TkSmoothParseProc,
- TkSmoothPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption stateOption = {
- (Tk_OptionParseProc *) TkStateParseProc,
- TkStatePrintProc, (ClientData) 2
- };
- static Tk_CustomOption tagsOption = {
- (Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
- Tk_CanvasTagsPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption dashOption = {
- (Tk_OptionParseProc *) TkCanvasDashParseProc,
- TkCanvasDashPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption offsetOption = {
- (Tk_OptionParseProc *) TkOffsetParseProc,
- TkOffsetPrintProc,
- (ClientData) (TK_OFFSET_RELATIVE|TK_OFFSET_INDEX)
- };
- static Tk_CustomOption pixelOption = {
- (Tk_OptionParseProc *) TkPixelParseProc,
- TkPixelPrintProc, (ClientData) NULL
- };
- static Tk_ConfigSpec configSpecs[] = {
- {TK_CONFIG_CUSTOM, "-activedash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.activeDash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, activeFillColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_COLOR, "-activeoutline", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.activeColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-activeoutlinestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.activeStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, activeFillStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-activewidth", (char *) NULL, (char *) NULL,
- "0.0", Tk_Offset(PolygonItem, outline.activeWidth),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_CUSTOM, "-dash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.dash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_PIXELS, "-dashoffset", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(PolygonItem, outline.offset),
- TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-disableddash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.disabledDash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, disabledFillColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_COLOR, "-disabledoutline", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.disabledColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-disabledoutlinestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.disabledStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, disabledFillStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-disabledwidth", (char *) NULL, (char *) NULL,
- "0.0", Tk_Offset(PolygonItem, outline.disabledWidth),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
- "black", Tk_Offset(PolygonItem, fillColor), TK_CONFIG_NULL_OK},
- {TK_CONFIG_JOIN_STYLE, "-joinstyle", (char *) NULL, (char *) NULL,
- "round", Tk_Offset(PolygonItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
- "0,0", Tk_Offset(PolygonItem, tsoffset),
- TK_CONFIG_NULL_OK, &offsetOption},
- {TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.color),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-outlineoffset", (char *) NULL, (char *) NULL,
- "0,0", Tk_Offset(PolygonItem, outline.tsoffset),
- TK_CONFIG_NULL_OK, &offsetOption},
- {TK_CONFIG_BITMAP, "-outlinestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, outline.stipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-smooth", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(PolygonItem, smooth),
- TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
- {TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL,
- "12", Tk_Offset(PolygonItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
- &stateOption},
- {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(PolygonItem, fillStipple), TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
- (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
- {TK_CONFIG_CUSTOM, "-width", (char *) NULL, (char *) NULL,
- "1.0", Tk_Offset(PolygonItem, outline.width),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
- (char *) NULL, 0, 0}
- };
- /*
- * Prototypes for procedures defined in this file:
- */
- static void ComputePolygonBbox _ANSI_ARGS_((Tk_Canvas canvas,
- PolygonItem *polyPtr));
- static int ConfigurePolygon _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
- Tcl_Obj *CONST objv[], int flags));
- static int CreatePolygon _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, struct Tk_Item *itemPtr,
- int objc, Tcl_Obj *CONST objv[]));
- static void DeletePolygon _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, Display *display));
- static void DisplayPolygon _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, Display *display, Drawable dst,
- int x, int y, int width, int height));
- static int GetPolygonIndex _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr,
- Tcl_Obj *obj, int *indexPtr));
- static int PolygonCoords _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr,
- int objc, Tcl_Obj *CONST objv[]));
- static void PolygonDeleteCoords _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, int first, int last));
- static void PolygonInsert _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj));
- static int PolygonToArea _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double *rectPtr));
- static double PolygonToPoint _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double *pointPtr));
- static int PolygonToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
- static void ScalePolygon _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double originX, double originY,
- double scaleX, double scaleY));
- static void TranslatePolygon _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double deltaX, double deltaY));
- /*
- * The structures below defines the polygon item type by means
- * of procedures that can be invoked by generic item code.
- */
- Tk_ItemType tkPolygonType = {
- "polygon", /* name */
- sizeof(PolygonItem), /* itemSize */
- CreatePolygon, /* createProc */
- configSpecs, /* configSpecs */
- ConfigurePolygon, /* configureProc */
- PolygonCoords, /* coordProc */
- DeletePolygon, /* deleteProc */
- DisplayPolygon, /* displayProc */
- TK_CONFIG_OBJS, /* flags */
- PolygonToPoint, /* pointProc */
- PolygonToArea, /* areaProc */
- PolygonToPostscript, /* postscriptProc */
- ScalePolygon, /* scaleProc */
- TranslatePolygon, /* translateProc */
- (Tk_ItemIndexProc *) GetPolygonIndex,/* indexProc */
- (Tk_ItemCursorProc *) NULL, /* icursorProc */
- (Tk_ItemSelectionProc *) NULL, /* selectionProc */
- (Tk_ItemInsertProc *) PolygonInsert,/* insertProc */
- PolygonDeleteCoords, /* dTextProc */
- (Tk_ItemType *) NULL, /* nextPtr */
- };
- /*
- * The definition below determines how large are static arrays
- * used to hold spline points (splines larger than this have to
- * have their arrays malloc-ed).
- */
- #define MAX_STATIC_POINTS 200
- /*
- *--------------------------------------------------------------
- *
- * CreatePolygon --
- *
- * This procedure is invoked to create a new polygon item in
- * a canvas.
- *
- * Results:
- * A standard Tcl return value. If an error occurred in
- * creating the item, then an error message is left in
- * the interp's result; in this case itemPtr is
- * left uninitialized, so it can be safely freed by the
- * caller.
- *
- * Side effects:
- * A new polygon item is created.
- *
- *--------------------------------------------------------------
- */
- static int
- CreatePolygon(interp, canvas, itemPtr, objc, objv)
- Tcl_Interp *interp; /* Interpreter for error reporting. */
- Tk_Canvas canvas; /* Canvas to hold new item. */
- Tk_Item *itemPtr; /* Record to hold new item; header
- * has been initialized by caller. */
- int objc; /* Number of arguments in objv. */
- Tcl_Obj *CONST objv[]; /* Arguments describing polygon. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- int i;
- if (objc == 0) {
- panic("canvas did not pass any coordsn");
- }
- /*
- * Carry out initialization that is needed in order to clean
- * up after errors during the the remainder of this procedure.
- */
- Tk_CreateOutline(&(polyPtr->outline));
- polyPtr->numPoints = 0;
- polyPtr->pointsAllocated = 0;
- polyPtr->coordPtr = NULL;
- polyPtr->joinStyle = JoinRound;
- polyPtr->tsoffset.flags = 0;
- polyPtr->tsoffset.xoffset = 0;
- polyPtr->tsoffset.yoffset = 0;
- polyPtr->fillColor = NULL;
- polyPtr->activeFillColor = NULL;
- polyPtr->disabledFillColor = NULL;
- polyPtr->fillStipple = None;
- polyPtr->activeFillStipple = None;
- polyPtr->disabledFillStipple = None;
- polyPtr->fillGC = None;
- polyPtr->smooth = (Tk_SmoothMethod *) NULL;
- polyPtr->splineSteps = 12;
- polyPtr->autoClosed = 0;
- /*
- * Count the number of points and then parse them into a point
- * array. Leading arguments are assumed to be points if they
- * start with a digit or a minus sign followed by a digit.
- */
- for (i = 0; i < objc; i++) {
- char *arg = Tcl_GetString(objv[i]);
- if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
- break;
- }
- }
- if (i && PolygonCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
- goto error;
- }
- if (ConfigurePolygon(interp, canvas, itemPtr, objc-i, objv+i, 0)
- == TCL_OK) {
- return TCL_OK;
- }
- error:
- DeletePolygon(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
- return TCL_ERROR;
- }
- /*
- *--------------------------------------------------------------
- *
- * PolygonCoords --
- *
- * This procedure is invoked to process the "coords" widget
- * command on polygons. See the user documentation for details
- * on what it does.
- *
- * Results:
- * Returns TCL_OK or TCL_ERROR, and sets the interp's result.
- *
- * Side effects:
- * The coordinates for the given item may be changed.
- *
- *--------------------------------------------------------------
- */
- static int
- PolygonCoords(interp, canvas, itemPtr, objc, objv)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item whose coordinates are to be
- * read or modified. */
- int objc; /* Number of coordinates supplied in
- * objv. */
- Tcl_Obj *CONST objv[]; /* Array of coordinates: x1, y1,
- * x2, y2, ... */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- int i, numPoints;
- if (objc == 0) {
- /*
- * Print the coords used to create the polygon. If we auto
- * closed the polygon then we don't report the last point.
- */
- Tcl_Obj *subobj, *obj = Tcl_NewObj();
- for (i = 0; i < 2*(polyPtr->numPoints - polyPtr->autoClosed); i++) {
- subobj = Tcl_NewDoubleObj(polyPtr->coordPtr[i]);
- Tcl_ListObjAppendElement(interp, obj, subobj);
- }
- Tcl_SetObjResult(interp, obj);
- return TCL_OK;
- }
- if (objc == 1) {
- if (Tcl_ListObjGetElements(interp, objv[0], &objc,
- (Tcl_Obj ***) &objv) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- if (objc & 1) {
- char buf[64 + TCL_INTEGER_SPACE];
- sprintf(buf, "wrong # coordinates: expected an even number, got %d",
- objc);
- Tcl_SetResult(interp, buf, TCL_VOLATILE);
- return TCL_ERROR;
- } else {
- numPoints = objc/2;
- if (polyPtr->pointsAllocated <= numPoints) {
- if (polyPtr->coordPtr != NULL) {
- ckfree((char *) polyPtr->coordPtr);
- }
- /*
- * One extra point gets allocated here, because we always
- * add another point to close the polygon.
- */
- polyPtr->coordPtr = (double *) ckalloc((unsigned)
- (sizeof(double) * (objc+2)));
- polyPtr->pointsAllocated = numPoints+1;
- }
- for (i = objc-1; i >= 0; i--) {
- if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[i],
- &polyPtr->coordPtr[i]) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- polyPtr->numPoints = numPoints;
- polyPtr->autoClosed = 0;
- /*
- * Close the polygon if it isn't already closed.
- */
-
- if (objc>2 && ((polyPtr->coordPtr[objc-2] != polyPtr->coordPtr[0])
- || (polyPtr->coordPtr[objc-1] != polyPtr->coordPtr[1]))) {
- polyPtr->autoClosed = 1;
- polyPtr->numPoints++;
- polyPtr->coordPtr[objc] = polyPtr->coordPtr[0];
- polyPtr->coordPtr[objc+1] = polyPtr->coordPtr[1];
- }
- ComputePolygonBbox(canvas, polyPtr);
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * ConfigurePolygon --
- *
- * This procedure is invoked to configure various aspects
- * of a polygon item such as its background color.
- *
- * Results:
- * A standard Tcl result code. If an error occurs, then
- * an error message is left in the interp's result.
- *
- * Side effects:
- * Configuration information, such as colors and stipple
- * patterns, may be set for itemPtr.
- *
- *--------------------------------------------------------------
- */
- static int
- ConfigurePolygon(interp, canvas, itemPtr, objc, objv, flags)
- Tcl_Interp *interp; /* Interpreter for error reporting. */
- Tk_Canvas canvas; /* Canvas containing itemPtr. */
- Tk_Item *itemPtr; /* Polygon item to reconfigure. */
- int objc; /* Number of elements in objv. */
- Tcl_Obj *CONST objv[]; /* Arguments describing things to configure. */
- int flags; /* Flags to pass to Tk_ConfigureWidget. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- XGCValues gcValues;
- GC newGC;
- unsigned long mask;
- Tk_Window tkwin;
- XColor *color;
- Pixmap stipple;
- Tk_State state;
- tkwin = Tk_CanvasTkwin(canvas);
- if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
- (CONST char **) objv, (char *) polyPtr, flags|TK_CONFIG_OBJS)) {
- return TCL_ERROR;
- }
- /*
- * A few of the options require additional processing, such as
- * graphics contexts.
- */
- state = itemPtr->state;
- if (polyPtr->outline.activeWidth > polyPtr->outline.width ||
- polyPtr->outline.activeDash.number != 0 ||
- polyPtr->outline.activeColor != NULL ||
- polyPtr->outline.activeStipple != None ||
- polyPtr->activeFillColor != NULL ||
- polyPtr->activeFillStipple != None) {
- itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
- } else {
- itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
- }
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (state==TK_STATE_HIDDEN) {
- ComputePolygonBbox(canvas, polyPtr);
- return TCL_OK;
- }
- mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr, &(polyPtr->outline));
- if (mask) {
- gcValues.cap_style = CapRound;
- gcValues.join_style = polyPtr->joinStyle;
- mask |= GCCapStyle|GCJoinStyle;
- newGC = Tk_GetGC(tkwin, mask, &gcValues);
- } else {
- newGC = None;
- }
- if (polyPtr->outline.gc != None) {
- Tk_FreeGC(Tk_Display(tkwin), polyPtr->outline.gc);
- }
- polyPtr->outline.gc = newGC;
- color = polyPtr->fillColor;
- stipple = polyPtr->fillStipple;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (polyPtr->activeFillColor!=NULL) {
- color = polyPtr->activeFillColor;
- }
- if (polyPtr->activeFillStipple!=None) {
- stipple = polyPtr->activeFillStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->disabledFillColor!=NULL) {
- color = polyPtr->disabledFillColor;
- }
- if (polyPtr->disabledFillStipple!=None) {
- stipple = polyPtr->disabledFillStipple;
- }
- }
- if (color == NULL) {
- newGC = None;
- } else {
- gcValues.foreground = color->pixel;
- mask = GCForeground;
- if (stipple != None) {
- gcValues.stipple = stipple;
- gcValues.fill_style = FillStippled;
- mask |= GCStipple|GCFillStyle;
- }
- #ifdef MAC_OSX_TK
- /*
- * Mac OS X CG drawing needs access to the outline linewidth
- * even for fills (as linewidth controls antialiasing).
- */
- gcValues.line_width = polyPtr->outline.gc != None ?
- polyPtr->outline.gc->line_width : 0;
- mask |= GCLineWidth;
- #endif
- newGC = Tk_GetGC(tkwin, mask, &gcValues);
- }
- if (polyPtr->fillGC != None) {
- Tk_FreeGC(Tk_Display(tkwin), polyPtr->fillGC);
- }
- polyPtr->fillGC = newGC;
- /*
- * Keep spline parameters within reasonable limits.
- */
- if (polyPtr->splineSteps < 1) {
- polyPtr->splineSteps = 1;
- } else if (polyPtr->splineSteps > 100) {
- polyPtr->splineSteps = 100;
- }
- ComputePolygonBbox(canvas, 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(canvas, itemPtr, display)
- Tk_Canvas canvas; /* Info about overall canvas widget. */
- Tk_Item *itemPtr; /* Item that is being deleted. */
- Display *display; /* Display containing window for
- * canvas. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- Tk_DeleteOutline(display,&(polyPtr->outline));
- if (polyPtr->coordPtr != NULL) {
- ckfree((char *) polyPtr->coordPtr);
- }
- if (polyPtr->fillColor != NULL) {
- Tk_FreeColor(polyPtr->fillColor);
- }
- if (polyPtr->activeFillColor != NULL) {
- Tk_FreeColor(polyPtr->activeFillColor);
- }
- if (polyPtr->disabledFillColor != NULL) {
- Tk_FreeColor(polyPtr->disabledFillColor);
- }
- if (polyPtr->fillStipple != None) {
- Tk_FreeBitmap(display, polyPtr->fillStipple);
- }
- if (polyPtr->activeFillStipple != None) {
- Tk_FreeBitmap(display, polyPtr->activeFillStipple);
- }
- if (polyPtr->disabledFillStipple != None) {
- Tk_FreeBitmap(display, polyPtr->disabledFillStipple);
- }
- if (polyPtr->fillGC != None) {
- Tk_FreeGC(display, polyPtr->fillGC);
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * 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(canvas, polyPtr)
- Tk_Canvas canvas; /* Canvas that contains item. */
- PolygonItem *polyPtr; /* Item whose bbox is to be
- * recomputed. */
- {
- double *coordPtr;
- int i;
- double width;
- Tk_State state = polyPtr->header.state;
- Tk_TSOffset *tsoffset;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = polyPtr->outline.width;
- if (polyPtr->coordPtr == NULL || (polyPtr->numPoints < 1) || (state==TK_STATE_HIDDEN)) {
- polyPtr->header.x1 = polyPtr->header.x2 =
- polyPtr->header.y1 = polyPtr->header.y2 = -1;
- return;
- }
- if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)polyPtr) {
- if (polyPtr->outline.activeWidth>width) {
- width = polyPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->outline.disabledWidth>0.0) {
- width = polyPtr->outline.disabledWidth;
- }
- }
- coordPtr = polyPtr->coordPtr;
- polyPtr->header.x1 = polyPtr->header.x2 = (int) *coordPtr;
- polyPtr->header.y1 = polyPtr->header.y2 = (int) coordPtr[1];
- /*
- * Compute the bounding box of all the points in the polygon,
- * then expand in all directions by the outline's width to take
- * care of butting or rounded corners and projecting or
- * rounded caps. This expansion is an overestimate (worst-case
- * is square root of two over two) but it's simple. Don't do
- * anything special for curves. This causes an additional
- * overestimate in the bounding box, but is faster.
- */
- for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints-1;
- i++, coordPtr += 2) {
- TkIncludePoint((Tk_Item *) polyPtr, coordPtr);
- }
- tsoffset = &polyPtr->tsoffset;
- if (tsoffset->flags & TK_OFFSET_INDEX) {
- int index = tsoffset->flags & ~TK_OFFSET_INDEX;
- if (tsoffset->flags == INT_MAX) {
- index = (polyPtr->numPoints - polyPtr->autoClosed) * 2;
- if (index < 0) {
- index = 0;
- }
- }
- index %= (polyPtr->numPoints - polyPtr->autoClosed) * 2;
- if (index <0) {
- index += (polyPtr->numPoints - polyPtr->autoClosed) * 2;
- }
- tsoffset->xoffset = (int) (polyPtr->coordPtr[index] + 0.5);
- tsoffset->yoffset = (int) (polyPtr->coordPtr[index+1] + 0.5);
- } else {
- if (tsoffset->flags & TK_OFFSET_LEFT) {
- tsoffset->xoffset = polyPtr->header.x1;
- } else if (tsoffset->flags & TK_OFFSET_CENTER) {
- tsoffset->xoffset = (polyPtr->header.x1 + polyPtr->header.x2)/2;
- } else if (tsoffset->flags & TK_OFFSET_RIGHT) {
- tsoffset->xoffset = polyPtr->header.x2;
- }
- if (tsoffset->flags & TK_OFFSET_TOP) {
- tsoffset->yoffset = polyPtr->header.y1;
- } else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
- tsoffset->yoffset = (polyPtr->header.y1 + polyPtr->header.y2)/2;
- } else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
- tsoffset->yoffset = polyPtr->header.y2;
- }
- }
- if (polyPtr->outline.gc != None) {
- tsoffset = &polyPtr->outline.tsoffset;
- if (tsoffset) {
- if (tsoffset->flags & TK_OFFSET_INDEX) {
- int index = tsoffset->flags & ~TK_OFFSET_INDEX;
- if (tsoffset->flags == INT_MAX) {
- index = (polyPtr->numPoints - 1) * 2;
- }
- index %= (polyPtr->numPoints - 1) * 2;
- if (index <0) {
- index += (polyPtr->numPoints - 1) * 2;
- }
- tsoffset->xoffset = (int) (polyPtr->coordPtr[index] + 0.5);
- tsoffset->yoffset = (int) (polyPtr->coordPtr[index+1] + 0.5);
- } else {
- if (tsoffset->flags & TK_OFFSET_LEFT) {
- tsoffset->xoffset = polyPtr->header.x1;
- } else if (tsoffset->flags & TK_OFFSET_CENTER) {
- tsoffset->xoffset = (polyPtr->header.x1 + polyPtr->header.x2)/2;
- } else if (tsoffset->flags & TK_OFFSET_RIGHT) {
- tsoffset->xoffset = polyPtr->header.x2;
- }
- if (tsoffset->flags & TK_OFFSET_TOP) {
- tsoffset->yoffset = polyPtr->header.y1;
- } else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
- tsoffset->yoffset = (polyPtr->header.y1 + polyPtr->header.y2)/2;
- } else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
- tsoffset->yoffset = polyPtr->header.y2;
- }
- }
- }
- i = (int) ((width+1.5)/2.0);
- polyPtr->header.x1 -= i;
- polyPtr->header.x2 += i;
- polyPtr->header.y1 -= i;
- polyPtr->header.y2 += i;
- /*
- * For mitered lines, make a second pass through all the points.
- * Compute the locations of the two miter vertex points and add
- * those into the bounding box.
- */
- if (polyPtr->joinStyle == JoinMiter) {
- double miter[4];
- int j;
- coordPtr = polyPtr->coordPtr;
- if (polyPtr->numPoints>3) {
- if (TkGetMiterPoints(coordPtr+2*(polyPtr->numPoints-2),
- coordPtr, coordPtr+2, width,
- miter, miter+2)) {
- for (j = 0; j < 4; j += 2) {
- TkIncludePoint((Tk_Item *) polyPtr, miter+j);
- }
- }
- }
- for (i = polyPtr->numPoints ; i >= 3;
- i--, coordPtr += 2) {
-
- if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
- width, miter, miter+2)) {
- for (j = 0; j < 4; j += 2) {
- TkIncludePoint((Tk_Item *) polyPtr, miter+j);
- }
- }
- }
- }
- }
- /*
- * 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 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 && numPoints>3) {
- 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;
- Tk_State state = itemPtr->state;
- Pixmap stipple = polyPtr->fillStipple;
- double linewidth = polyPtr->outline.width;
- if (((polyPtr->fillGC == None) && (polyPtr->outline.gc == None)) ||
- (polyPtr->numPoints < 1) ||
- (polyPtr->numPoints < 3 && polyPtr->outline.gc == None)) {
- return;
- }
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (polyPtr->outline.activeWidth>linewidth) {
- linewidth = polyPtr->outline.activeWidth;
- }
- if (polyPtr->activeFillStipple != None) {
- stipple = polyPtr->activeFillStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->outline.disabledWidth>0.0) {
- linewidth = polyPtr->outline.disabledWidth;
- }
- if (polyPtr->disabledFillStipple != None) {
- stipple = polyPtr->disabledFillStipple;
- }
- }
- /*
- * 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 ((stipple != None) && (polyPtr->fillGC != None)) {
- Tk_TSOffset *tsoffset = &polyPtr->tsoffset;
- int w=0; int h=0;
- int flags = tsoffset->flags;
- if (!(flags & TK_OFFSET_INDEX) && (flags & (TK_OFFSET_CENTER|TK_OFFSET_MIDDLE))) {
- Tk_SizeOfBitmap(display, stipple, &w, &h);
- if (flags & TK_OFFSET_CENTER) {
- w /= 2;
- } else {
- w = 0;
- }
- if (flags & TK_OFFSET_MIDDLE) {
- h /= 2;
- } else {
- h = 0;
- }
- }
- tsoffset->xoffset -= w;
- tsoffset->yoffset -= h;
- Tk_CanvasSetOffset(canvas, polyPtr->fillGC, tsoffset);
- tsoffset->xoffset += w;
- tsoffset->yoffset += h;
- }
- Tk_ChangeOutlineGC(canvas, itemPtr, &(polyPtr->outline));
- if(polyPtr->numPoints < 3) {
- short x,y;
- int intLineWidth = (int) (linewidth + 0.5);
- if (intLineWidth < 1) {
- intLineWidth = 1;
- }
- Tk_CanvasDrawableCoords(canvas, polyPtr->coordPtr[0],
- polyPtr->coordPtr[1], &x,&y);
- XFillArc(display, drawable, polyPtr->outline.gc,
- x - intLineWidth/2, y - intLineWidth/2,
- (unsigned int)intLineWidth+1, (unsigned int)intLineWidth+1,
- 0, 64*360);
- } else if (!polyPtr->smooth || polyPtr->numPoints < 4) {
- TkFillPolygon(canvas, polyPtr->coordPtr, polyPtr->numPoints,
- display, drawable, polyPtr->fillGC, polyPtr->outline.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 = polyPtr->smooth->coordProc(canvas, (double *) NULL,
- polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- if (numPoints <= MAX_STATIC_POINTS) {
- pointPtr = staticPoints;
- } else {
- pointPtr = (XPoint *) ckalloc((unsigned)
- (numPoints * sizeof(XPoint)));
- }
- numPoints = polyPtr->smooth->coordProc(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->outline.gc != None) {
- XDrawLines(display, drawable, polyPtr->outline.gc, pointPtr,
- numPoints, CoordModeOrigin);
- }
- if (pointPtr != staticPoints) {
- ckfree((char *) pointPtr);
- }
- }
- Tk_ResetOutlineGC(canvas, itemPtr, &(polyPtr->outline));
- if ((stipple != None) && (polyPtr->fillGC != None)) {
- XSetTSOrigin(display, polyPtr->fillGC, 0, 0);
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * PolygonInsert --
- *
- * Insert coords into a polugon item at a given index.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The coords in the given item is modified.
- *
- *--------------------------------------------------------------
- */
- static void
- PolygonInsert(canvas, itemPtr, beforeThis, obj)
- Tk_Canvas canvas; /* Canvas containing text item. */
- Tk_Item *itemPtr; /* Line item to be modified. */
- int beforeThis; /* Index before which new coordinates
- * are to be inserted. */
- Tcl_Obj *obj; /* New coordinates to be inserted. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- int length, objc, i;
- Tcl_Obj **objv;
- double *new;
- Tk_State state = itemPtr->state;
- if (state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (!obj || (Tcl_ListObjGetElements((Tcl_Interp *) NULL, obj, &objc, &objv) != TCL_OK)
- || !objc || objc&1) {
- return;
- }
- length = 2*(polyPtr->numPoints - polyPtr->autoClosed);
- while(beforeThis>length) beforeThis-=length;
- while(beforeThis<0) beforeThis+=length;
- new = (double *) ckalloc((unsigned)(sizeof(double) * (length + 2 + objc)));
- for (i=0; i<beforeThis; i++) {
- new[i] = polyPtr->coordPtr[i];
- }
- for (i=0; i<objc; i++) {
- if (Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,objv[i],
- new+(i+beforeThis))!=TCL_OK) {
- ckfree((char *) new);
- return;
- }
- }
- for(i=beforeThis; i<length; i++) {
- new[i+objc] = polyPtr->coordPtr[i];
- }
- if(polyPtr->coordPtr) ckfree((char *) polyPtr->coordPtr);
- length+=objc;
- polyPtr->coordPtr = new;
- polyPtr->numPoints = (length/2) + polyPtr->autoClosed;
- /*
- * Close the polygon if it isn't already closed, or remove autoclosing
- * if the user's coordinates are now closed.
- */
- if (polyPtr->autoClosed) {
- if ((new[length-2] == new[0]) && (new[length-1] == new[1])) {
- polyPtr->autoClosed = 0;
- polyPtr->numPoints--;
- }
- }
- else {
- if ((new[length-2] != new[0]) || (new[length-1] != new[1])) {
- polyPtr->autoClosed = 1;
- polyPtr->numPoints++;
- }
- }
- new[length] = new[0];
- new[length+1] = new[1];
- if (((length-objc)>3) && (state != TK_STATE_HIDDEN)) {
- /*
- * This is some optimizing code that will result that only the part
- * of the polygon that changed (and the objects that are overlapping
- * with that part) need to be redrawn. A special flag is set that
- * instructs the general canvas code not to redraw the whole
- * object. If this flag is not set, the canvas will do the redrawing,
- * otherwise I have to do it here.
- */
- double width;
- int j;
- itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
- /*
- * The header elements that normally are used for the
- * bounding box, are now used to calculate the bounding
- * box for only the part that has to be redrawn. That
- * doesn't matter, because afterwards the bounding
- * box has to be re-calculated anyway.
- */
- itemPtr->x1 = itemPtr->x2 = (int) polyPtr->coordPtr[beforeThis];
- itemPtr->y1 = itemPtr->y2 = (int) polyPtr->coordPtr[beforeThis+1];
- beforeThis-=2; objc+=4;
- if(polyPtr->smooth) {
- beforeThis-=2; objc+=4;
- } /* be carefull; beforeThis could now be negative */
- for(i=beforeThis; i<beforeThis+objc; i+=2) {
- j=i;
- if(j<0) j+=length;
- if(j>=length) j-=length;
- TkIncludePoint(itemPtr, polyPtr->coordPtr+j);
- }
- width = polyPtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (polyPtr->outline.activeWidth>width) {
- width = polyPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->outline.disabledWidth>0.0) {
- width = polyPtr->outline.disabledWidth;
- }
- }
- itemPtr->x1 -= (int) width; itemPtr->y1 -= (int) width;
- itemPtr->x2 += (int) width; itemPtr->y2 += (int) width;
- Tk_CanvasEventuallyRedraw(canvas,
- itemPtr->x1, itemPtr->y1,
- itemPtr->x2, itemPtr->y2);
- }
- ComputePolygonBbox(canvas, polyPtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * PolygonDeleteCoords --
- *
- * Delete one or more coordinates from a polygon item.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Characters between "first" and "last", inclusive, get
- * deleted from itemPtr.
- *
- *--------------------------------------------------------------
- */
- static void
- PolygonDeleteCoords(canvas, itemPtr, first, last)
- Tk_Canvas canvas; /* Canvas containing itemPtr. */
- Tk_Item *itemPtr; /* Item in which to delete characters. */
- int first; /* Index of first character to delete. */
- int last; /* Index of last character to delete. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- int count, i;
- int length = 2*(polyPtr->numPoints - polyPtr->autoClosed);
- while(first>=length) first-=length;
- while(first<0) first+=length;
- while(last>=length) last-=length;
- while(last<0) last+=length;
- first &= -2;
- last &= -2;
- count = last + 2 - first;
- if(count<=0) count +=length;
- if(count >= length) {
- polyPtr->numPoints = 0;
- if(polyPtr->coordPtr != NULL) {
- ckfree((char *) polyPtr->coordPtr);
- }
- ComputePolygonBbox(canvas, polyPtr);
- return;
- }
- if(last>=first) {
- for(i=last+2; i<length; i++) {
- polyPtr->coordPtr[i-count] = polyPtr->coordPtr[i];
- }
- } else {
- for(i=last; i<=first; i++) {
- polyPtr->coordPtr[i-last] = polyPtr->coordPtr[i];
- }
- }
- polyPtr->coordPtr[length-count] = polyPtr->coordPtr[0];
- polyPtr->coordPtr[length-count+1] = polyPtr->coordPtr[1];
- polyPtr->numPoints -= count/2;
- ComputePolygonBbox(canvas, polyPtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * 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, *polyPoints;
- double staticSpace[2*MAX_STATIC_POINTS];
- double poly[10];
- double radius;
- double bestDist, dist;
- int numPoints, count;
- int changedMiterToBevel; /* Non-zero means that a mitered corner
- * had to be treated as beveled after all
- * because the angle was < 11 degrees. */
- double width;
- Tk_State state = itemPtr->state;
- bestDist = 1.0e36;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = polyPtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (polyPtr->outline.activeWidth>width) {
- width = polyPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->outline.disabledWidth>0.0) {
- width = polyPtr->outline.disabledWidth;
- }
- }
- radius = width/2.0;
- /*
- * Handle smoothed polygons by generating an expanded set of points
- * against which to do the check.
- */
- if ((polyPtr->smooth) && (polyPtr->numPoints>2)) {
- numPoints = polyPtr->smooth->coordProc(canvas, (double *) NULL,
- polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- if (numPoints <= MAX_STATIC_POINTS) {
- polyPoints = staticSpace;
- } else {
- polyPoints = (double *) ckalloc((unsigned)
- (2*numPoints*sizeof(double)));
- }
- numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
- polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
- polyPoints);
- } else {
- numPoints = polyPtr->numPoints;
- polyPoints = polyPtr->coordPtr;
- }
- bestDist = TkPolygonToPoint(polyPoints, numPoints, pointPtr);
- if (bestDist<=0.0) {
- goto donepoint;
- }
- if ((polyPtr->outline.gc != None) && (polyPtr->joinStyle == JoinRound)) {
- dist = bestDist - radius;
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto donepoint;
- } else {
- bestDist = dist;
- }
- }
- if ((polyPtr->outline.gc == None) || (width <= 1)) goto donepoint;
- /*
- * The overall idea is to iterate through all of the edges of
- * the line, computing a polygon for each edge and testing the
- * point against that polygon. In addition, there are additional
- * tests to deal with rounded joints and caps.
- */
- changedMiterToBevel = 0;
- for (count = numPoints, coordPtr = polyPoints; count >= 2;
- count--, coordPtr += 2) {
- /*
- * If rounding is done around the first point then compute
- * the distance between the point and the point.
- */
- if (polyPtr->joinStyle == JoinRound) {
- dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- - radius;
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto donepoint;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- /*
- * Compute the polygonal shape corresponding to this edge,
- * consisting of two points for the first point of the edge
- * and two points for the last point of the edge.
- */
- if (count == numPoints) {
- TkGetButtPoints(coordPtr+2, coordPtr, (double) width,
- 0, poly, poly+2);
- } else if ((polyPtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
- poly[0] = poly[6];
- poly[1] = poly[7];
- poly[2] = poly[4];
- poly[3] = poly[5];
- } else {
- TkGetButtPoints(coordPtr+2, coordPtr, (double) width, 0,
- poly, poly+2);
- /*
- * If this line uses beveled joints, then check the distance
- * to a polygon comprising the last two points of the previous
- * polygon and the first two from this polygon; this checks
- * the wedges that fill the mitered joint.
- */
- if ((polyPtr->joinStyle == JoinBevel) || changedMiterToBevel) {
- poly[8] = poly[0];
- poly[9] = poly[1];
- dist = TkPolygonToPoint(poly, 5, pointPtr);
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto donepoint;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- changedMiterToBevel = 0;
- }
- }
- if (count == 2) {
- TkGetButtPoints(coordPtr, coordPtr+2, (double) width,
- 0, poly+4, poly+6);
- } else if (polyPtr->joinStyle == JoinMiter) {
- if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
- (double) width, poly+4, poly+6) == 0) {
- changedMiterToBevel = 1;
- TkGetButtPoints(coordPtr, coordPtr+2, (double) width,
- 0, poly+4, poly+6);
- }
- } else {
- TkGetButtPoints(coordPtr, coordPtr+2, (double) width, 0,
- poly+4, poly+6);
- }
- poly[8] = poly[0];
- poly[9] = poly[1];
- dist = TkPolygonToPoint(poly, 5, pointPtr);
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto donepoint;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- donepoint:
- if ((polyPoints != staticSpace) && polyPoints != polyPtr->coordPtr) {
- ckfree((char *) polyPoints);
- }
- return bestDist;
- }
- /*
- *--------------------------------------------------------------
- *
- * 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;
- double staticSpace[2*MAX_STATIC_POINTS];
- double *polyPoints, poly[10];
- double radius;
- int numPoints, count;
- int changedMiterToBevel; /* Non-zero means that a mitered corner
- * had to be treated as beveled after all
- * because the angle was < 11 degrees. */
- int inside; /* Tentative guess about what to return,
- * based on all points seen so far: one
- * means everything seen so far was
- * inside the area; -1 means everything
- * was outside the area. 0 means overlap
- * has been found. */
- double width;
- Tk_State state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = polyPtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (polyPtr->outline.activeWidth>width) {
- width = polyPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->outline.disabledWidth>0.0) {
- width = polyPtr->outline.disabledWidth;
- }
- }
- radius = width/2.0;
- inside = -1;
- if ((state==TK_STATE_HIDDEN) || polyPtr->numPoints<2) {
- return -1;
- } else if (polyPtr->numPoints <3) {
- double oval[4];
- oval[0] = polyPtr->coordPtr[0]-radius;
- oval[1] = polyPtr->coordPtr[1]-radius;
- oval[2] = polyPtr->coordPtr[0]+radius;
- oval[3] = polyPtr->coordPtr[1]+radius;
- return TkOvalToArea(oval, rectPtr);
- }
- /*
- * Handle smoothed polygons by generating an expanded set of points
- * against which to do the check.
- */
- if (polyPtr->smooth) {
- numPoints = polyPtr->smooth->coordProc(canvas, (double *) NULL,
- polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- if (numPoints <= MAX_STATIC_POINTS) {
- polyPoints = staticSpace;
- } else {
- polyPoints = (double *) ckalloc((unsigned)
- (2*numPoints*sizeof(double)));
- }
- numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
- polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
- polyPoints);
- } else {
- numPoints = polyPtr->numPoints;
- polyPoints = polyPtr->coordPtr;
- }
- /*
- * Simple test to see if we are in the polygon. Polygons are
- * different from othe canvas items in that they register points
- * being inside even if it isn't filled.
- */
- inside = TkPolygonToArea(polyPoints, numPoints, rectPtr);
- if (inside==0) goto donearea;
- if (polyPtr->outline.gc == None) goto donearea ;
- /*
- * Iterate through all of the edges of the line, computing a polygon
- * for each edge and testing the area against that polygon. In
- * addition, there are additional tests to deal with rounded joints
- * and caps.
- */
- changedMiterToBevel = 0;
- for (count = numPoints, coordPtr = polyPoints; count >= 2;
- count--, coordPtr += 2) {
-
- /*
- * If rounding is done around the first point of the edge
- * then test a circular region around the point with the
- * area.
- */
- if (polyPtr->joinStyle == JoinRound) {
- poly[0] = coordPtr[0] - radius;
- poly[1] = coordPtr[1] - radius;
- poly[2] = coordPtr[0] + radius;
- poly[3] = coordPtr[1] + radius;
- if (TkOvalToArea(poly, rectPtr) != inside) {
- inside = 0;
- goto donearea;
- }
- }
- /*
- * Compute the polygonal shape corresponding to this edge,
- * consisting of two points for the first point of the edge
- * and two points for the last point of the edge.
- */
- if (count == numPoints) {
- TkGetButtPoints(coordPtr+2, coordPtr, width,
- 0, poly, poly+2);
- } else if ((polyPtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
- poly[0] = poly[6];
- poly[1] = poly[7];
- poly[2] = poly[4];
- poly[3] = poly[5];
- } else {
- TkGetButtPoints(coordPtr+2, coordPtr, width, 0,
- poly, poly+2);
- /*
- * If the last joint was beveled, then also check a
- * polygon comprising the last two points of the previous
- * polygon and the first two from this polygon; this checks
- * the wedges that fill the beveled joint.
- */
- if ((polyPtr->joinStyle == JoinBevel) || changedMiterToBevel) {
- poly[8] = poly[0];
- poly[9] = poly[1];
- if (TkPolygonToArea(poly, 5, rectPtr) != inside) {
- inside = 0;
- goto donearea;
- }
- changedMiterToBevel = 0;
- }
- }
- if (count == 2) {
- TkGetButtPoints(coordPtr, coordPtr+2, width,
- 0, poly+4, poly+6);
- } else if (polyPtr->joinStyle == JoinMiter) {
- if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
- width, poly+4, poly+6) == 0) {
- changedMiterToBevel = 1;
- TkGetButtPoints(coordPtr, coordPtr+2, width,
- 0, poly+4, poly+6);
- }
- } else {
- TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
- poly+4, poly+6);
- }
- poly[8] = poly[0];
- poly[9] = poly[1];
- if (TkPolygonToArea(poly, 5, rectPtr) != inside) {
- inside = 0;
- goto donearea;
- }
- }
- donearea:
- if ((polyPoints != staticSpace) && (polyPoints != polyPtr->coordPtr)) {
- ckfree((char *) polyPoints);
- }
- return inside;
- }
- /*
- *--------------------------------------------------------------
- *
- * 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);
- }
- /*
- *--------------------------------------------------------------
- *
- * GetPolygonIndex --
- *
- * Parse an index into a polygon item and return either its value
- * or an error.
- *
- * Results:
- * A standard Tcl result. If all went well, then *indexPtr is
- * filled in with the index (into itemPtr) corresponding to
- * string. Otherwise an error message is left in
- * interp->result.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- GetPolygonIndex(interp, canvas, itemPtr, obj, indexPtr)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item for which the index is being
- * specified. */
- Tcl_Obj *obj; /* Specification of a particular coord
- * in itemPtr's line. */
- int *indexPtr; /* Where to store converted index. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- int length;
- char *string = Tcl_GetStringFromObj(obj, &length);
- if (string[0] == 'e') {
- if (strncmp(string, "end", (unsigned) length) == 0) {
- *indexPtr = 2*(polyPtr->numPoints - polyPtr->autoClosed);
- } else {
- badIndex:
- /*
- * Some of the paths here leave messages in interp->result,
- * so we have to clear it out before storing our own message.
- */
- Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
- Tcl_AppendResult(interp, "bad index "", string, """,
- (char *) NULL);
- return TCL_ERROR;
- }
- } else if (string[0] == '@') {
- int i;
- double x ,y, bestDist, dist, *coordPtr;
- char *end, *p;
- p = string+1;
- x = strtod(p, &end);
- if ((end == p) || (*end != ',')) {
- goto badIndex;
- }
- p = end+1;
- y = strtod(p, &end);
- if ((end == p) || (*end != 0)) {
- goto badIndex;
- }
- bestDist = 1.0e36;
- coordPtr = polyPtr->coordPtr;
- *indexPtr = 0;
- for(i=0; i<(polyPtr->numPoints-1); i++) {
- dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
- if (dist<bestDist) {
- bestDist = dist;
- *indexPtr = 2*i;
- }
- coordPtr += 2;
- }
- } else {
- int count = 2*(polyPtr->numPoints - polyPtr->autoClosed);
- if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
- goto badIndex;
- }
- *indexPtr &= -2; /* if odd, make it even */
- if (count) {
- if (*indexPtr > 0) {
- *indexPtr = ((*indexPtr - 2) % count) + 2;
- } else {
- *indexPtr = -((-(*indexPtr)) % count);
- }
- } else {
- *indexPtr = 0;
- }
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * 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 the interp's 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. */
- {
- PolygonItem *polyPtr = (PolygonItem *) itemPtr;
- char *style;
- XColor *color;
- XColor *fillColor;
- Pixmap stipple;
- Pixmap fillStipple;
- Tk_State state = itemPtr->state;
- double width;
- if (polyPtr->numPoints<2 || polyPtr->coordPtr==NULL) {
- return TCL_OK;
- }
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = polyPtr->outline.width;
- color = polyPtr->outline.color;
- stipple = polyPtr->fillStipple;
- fillColor = polyPtr->fillColor;
- fillStipple = polyPtr->fillStipple;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (polyPtr->outline.activeWidth>width) {
- width = polyPtr->outline.activeWidth;
- }
- if (polyPtr->outline.activeColor!=NULL) {
- color = polyPtr->outline.activeColor;
- }
- if (polyPtr->outline.activeStipple!=None) {
- stipple = polyPtr->outline.activeStipple;
- }
- if (polyPtr->activeFillColor!=NULL) {
- fillColor = polyPtr->activeFillColor;
- }
- if (polyPtr->activeFillStipple!=None) {
- fillStipple = polyPtr->activeFillStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (polyPtr->outline.disabledWidth>0.0) {
- width = polyPtr->outline.disabledWidth;
- }
- if (polyPtr->outline.disabledColor!=NULL) {
- color = polyPtr->outline.disabledColor;
- }
- if (polyPtr->outline.disabledStipple!=None) {
- stipple = polyPtr->outline.disabledStipple;
- }
- if (polyPtr->disabledFillColor!=NULL) {
- fillColor = polyPtr->disabledFillColor;
- }
- if (polyPtr->disabledFillStipple!=None) {
- fillStipple = polyPtr->disabledFillStipple;
- }
- }
- if (polyPtr->numPoints==2) {
- char string[128];
- if (color == NULL) {
- return TCL_OK;
- }
- sprintf(string, "%.15g %.15g translate %.15g %.15g",
- polyPtr->coordPtr[0], Tk_CanvasPsY(canvas, polyPtr->coordPtr[1]),
- width/2.0, width/2.0);
- Tcl_AppendResult(interp, "matrix currentmatrixn",string,
- " scale 1 0 moveto 0 0 1 0 360 arcnsetmatrixn", (char *) NULL);
- if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
- return TCL_ERROR;
- }
- if (stipple != None) {
- Tcl_AppendResult(interp, "clip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
- return TCL_ERROR;
- }
- } else {
- Tcl_AppendResult(interp, "filln", (char *) NULL);
- }
- return TCL_OK;
- }
- /*
- * Fill the area of the polygon.
- */
- if (fillColor != NULL && polyPtr->numPoints>3) {
- if (!polyPtr->smooth || !polyPtr->smooth->postscriptProc) {
- Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
- polyPtr->numPoints);
- } else {
- polyPtr->smooth->postscriptProc(interp, canvas, polyPtr->coordPtr,
- polyPtr->numPoints, polyPtr->splineSteps);
- }
- if (Tk_CanvasPsColor(interp, canvas, fillColor) != TCL_OK) {
- return TCL_ERROR;
- }
- if (fillStipple != None) {
- Tcl_AppendResult(interp, "eoclip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas, fillStipple)
- != TCL_OK) {
- return TCL_ERROR;
- }
- if (color != NULL) {
- Tcl_AppendResult(interp, "grestore gsaven", (char *) NULL);
- }
- } else {
- Tcl_AppendResult(interp, "eofilln", (char *) NULL);
- }
- }
- /*
- * Now draw the outline, if there is one.
- */
- if (color != NULL) {
- if (!polyPtr->smooth || !polyPtr->smooth->postscriptProc) {
- Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
- polyPtr->numPoints);
- } else {
- polyPtr->smooth->postscriptProc(interp, canvas, polyPtr->coordPtr,
- polyPtr->numPoints, polyPtr->splineSteps);
- }
- if (polyPtr->joinStyle == JoinRound) {
- style = "1";
- } else if (polyPtr->joinStyle == JoinBevel) {
- style = "2";
- } else {
- style = "0";
- }
- Tcl_AppendResult(interp, style," setlinejoin 1 setlinecapn",
- (char *) NULL);
- if (Tk_CanvasPsOutline(canvas, itemPtr,
- &(polyPtr->outline)) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- return TCL_OK;
- }