/* * 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 1.9 2002/08/05 04:30:38 dgp Exp $ */ #include #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; /* * 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) { Tcl_AppendResult(interp, "odd number of coordinates specified for polygon", (char *) NULL); 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; } 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; icoordPtr[i]; } for (i=0; icoordPtr[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=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; icoordPtr[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; size_t length; char *string = Tcl_GetStringFromObj(obj, (int *) &length); if (string[0] == 'e') { if (strncmp(string, "end", 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 (distnumPoints - 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]; 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 currentmatrix\n",string, " scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n", (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, "fill\n", (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 gsave\n", (char *) NULL); } } else { Tcl_AppendResult(interp, "eofill\n", (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 setlinecap\n", (char *) NULL); if (Tk_CanvasPsOutline(canvas, itemPtr, &(polyPtr->outline)) != TCL_OK) { return TCL_ERROR; } } return TCL_OK; }