diff options
Diffstat (limited to 'tk8.6/generic/tkCanvPoly.c')
| -rw-r--r-- | tk8.6/generic/tkCanvPoly.c | 1999 |
1 files changed, 0 insertions, 1999 deletions
diff --git a/tk8.6/generic/tkCanvPoly.c b/tk8.6/generic/tkCanvPoly.c deleted file mode 100644 index b4ef098..0000000 --- a/tk8.6/generic/tkCanvPoly.c +++ /dev/null @@ -1,1999 +0,0 @@ -/* - * 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. - */ - -#include "tkInt.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. */ - const 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 const Tk_CustomOption smoothOption = { - TkSmoothParseProc, TkSmoothPrintProc, NULL -}; -static const Tk_CustomOption stateOption = { - TkStateParseProc, TkStatePrintProc, INT2PTR(2) -}; -static const Tk_CustomOption tagsOption = { - Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, NULL -}; -static const Tk_CustomOption dashOption = { - TkCanvasDashParseProc, TkCanvasDashPrintProc, NULL -}; -static const Tk_CustomOption offsetOption = { - TkOffsetParseProc, TkOffsetPrintProc, - INT2PTR(TK_OFFSET_RELATIVE|TK_OFFSET_INDEX) -}; -static const Tk_CustomOption pixelOption = { - TkPixelParseProc, TkPixelPrintProc, NULL -}; - -static const Tk_ConfigSpec configSpecs[] = { - {TK_CONFIG_CUSTOM, "-activedash", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.activeDash), - TK_CONFIG_NULL_OK, &dashOption}, - {TK_CONFIG_COLOR, "-activefill", NULL, NULL, - NULL, Tk_Offset(PolygonItem, activeFillColor), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_COLOR, "-activeoutline", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.activeColor), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_BITMAP, "-activeoutlinestipple", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.activeStipple), - TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_BITMAP, "-activestipple", NULL, NULL, - NULL, Tk_Offset(PolygonItem, activeFillStipple), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_CUSTOM, "-activewidth", NULL, NULL, - "0.0", Tk_Offset(PolygonItem, outline.activeWidth), - TK_CONFIG_DONT_SET_DEFAULT, &pixelOption}, - {TK_CONFIG_CUSTOM, "-dash", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.dash), - TK_CONFIG_NULL_OK, &dashOption}, - {TK_CONFIG_PIXELS, "-dashoffset", NULL, NULL, - "0", Tk_Offset(PolygonItem, outline.offset), - TK_CONFIG_DONT_SET_DEFAULT, NULL}, - {TK_CONFIG_CUSTOM, "-disableddash", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.disabledDash), - TK_CONFIG_NULL_OK, &dashOption}, - {TK_CONFIG_COLOR, "-disabledfill", NULL, NULL, - NULL, Tk_Offset(PolygonItem, disabledFillColor), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_COLOR, "-disabledoutline", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.disabledColor), - TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_BITMAP, "-disabledoutlinestipple", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.disabledStipple), - TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL, - NULL, Tk_Offset(PolygonItem, disabledFillStipple), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_CUSTOM, "-disabledwidth", NULL, NULL, - "0.0", Tk_Offset(PolygonItem, outline.disabledWidth), - TK_CONFIG_DONT_SET_DEFAULT, &pixelOption}, - {TK_CONFIG_COLOR, "-fill", NULL, NULL, - "black", Tk_Offset(PolygonItem, fillColor), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_JOIN_STYLE, "-joinstyle", NULL, NULL, - "round", Tk_Offset(PolygonItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT, NULL}, - {TK_CONFIG_CUSTOM, "-offset", NULL, NULL, - "0,0", Tk_Offset(PolygonItem, tsoffset), - TK_CONFIG_NULL_OK, &offsetOption}, - {TK_CONFIG_COLOR, "-outline", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.color), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_CUSTOM, "-outlineoffset", NULL, NULL, - "0,0", Tk_Offset(PolygonItem, outline.tsoffset), - TK_CONFIG_NULL_OK, &offsetOption}, - {TK_CONFIG_BITMAP, "-outlinestipple", NULL, NULL, - NULL, Tk_Offset(PolygonItem, outline.stipple), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_CUSTOM, "-smooth", NULL, NULL, - "0", Tk_Offset(PolygonItem, smooth), - TK_CONFIG_DONT_SET_DEFAULT, &smoothOption}, - {TK_CONFIG_INT, "-splinesteps", NULL, NULL, - "12", Tk_Offset(PolygonItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT, NULL}, - {TK_CONFIG_CUSTOM, "-state", NULL, NULL, - NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption}, - {TK_CONFIG_BITMAP, "-stipple", NULL, NULL, - NULL, Tk_Offset(PolygonItem, fillStipple), TK_CONFIG_NULL_OK, NULL}, - {TK_CONFIG_CUSTOM, "-tags", NULL, NULL, - NULL, 0, TK_CONFIG_NULL_OK, &tagsOption}, - {TK_CONFIG_CUSTOM, "-width", NULL, NULL, - "1.0", Tk_Offset(PolygonItem, outline.width), - TK_CONFIG_DONT_SET_DEFAULT, &pixelOption}, - {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL} -}; - -/* - * Prototypes for functions defined in this file: - */ - -static void ComputePolygonBbox(Tk_Canvas canvas, - PolygonItem *polyPtr); -static int ConfigurePolygon(Tcl_Interp *interp, - Tk_Canvas canvas, Tk_Item *itemPtr, int objc, - Tcl_Obj *const objv[], int flags); -static int CreatePolygon(Tcl_Interp *interp, - Tk_Canvas canvas, struct Tk_Item *itemPtr, - int objc, Tcl_Obj *const objv[]); -static void DeletePolygon(Tk_Canvas canvas, - Tk_Item *itemPtr, Display *display); -static void DisplayPolygon(Tk_Canvas canvas, - Tk_Item *itemPtr, Display *display, Drawable dst, - int x, int y, int width, int height); -static int GetPolygonIndex(Tcl_Interp *interp, - Tk_Canvas canvas, Tk_Item *itemPtr, - Tcl_Obj *obj, int *indexPtr); -static int PolygonCoords(Tcl_Interp *interp, - Tk_Canvas canvas, Tk_Item *itemPtr, - int objc, Tcl_Obj *const objv[]); -static void PolygonDeleteCoords(Tk_Canvas canvas, - Tk_Item *itemPtr, int first, int last); -static void PolygonInsert(Tk_Canvas canvas, - Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj); -static int PolygonToArea(Tk_Canvas canvas, - Tk_Item *itemPtr, double *rectPtr); -static double PolygonToPoint(Tk_Canvas canvas, - Tk_Item *itemPtr, double *pointPtr); -static int PolygonToPostscript(Tcl_Interp *interp, - Tk_Canvas canvas, Tk_Item *itemPtr, int prepass); -static void ScalePolygon(Tk_Canvas canvas, - Tk_Item *itemPtr, double originX, double originY, - double scaleX, double scaleY); -static void TranslatePolygon(Tk_Canvas canvas, - Tk_Item *itemPtr, double deltaX, double deltaY); - -/* - * The structures below defines the polygon item type by means of functions - * 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 | TK_MOVABLE_POINTS, /* flags */ - PolygonToPoint, /* pointProc */ - PolygonToArea, /* areaProc */ - PolygonToPostscript, /* postscriptProc */ - ScalePolygon, /* scaleProc */ - TranslatePolygon, /* translateProc */ - GetPolygonIndex, /* indexProc */ - NULL, /* icursorProc */ - NULL, /* selectionProc */ - PolygonInsert, /* insertProc */ - PolygonDeleteCoords, /* dTextProc */ - NULL, /* nextPtr */ - NULL, 0, NULL, NULL -}; - -/* - * 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 function 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( - 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) { - Tcl_Panic("canvas did not pass any coords"); - } - - /* - * Carry out initialization that is needed in order to clean up after - * errors during the the remainder of this function. - */ - - 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 = 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++) { - const 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 function 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( - 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_SetObjResult(interp, Tcl_ObjPrintf( - "wrong # coordinates: expected an even number, got %d", - objc)); - Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "POLYGON", NULL); - return TCL_ERROR; - } - - numPoints = objc/2; - if (polyPtr->pointsAllocated <= numPoints) { - if (polyPtr->coordPtr != NULL) { - ckfree(polyPtr->coordPtr); - } - - /* - * One extra point gets allocated here, because we always add - * another point to close the polygon. - */ - - polyPtr->coordPtr = ckalloc(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 function 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( - 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 = Canvas(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 (Canvas(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 function 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( - 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(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 function 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( - 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 = Canvas(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 (Canvas(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 function 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( - 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 = ckalloc(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(pointPtr); - } -} - -/* - *-------------------------------------------------------------- - * - * DisplayPolygon -- - * - * This function 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( - 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, int y, int width, int 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 = Canvas(canvas)->canvas_state; - } - if (Canvas(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, 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) intLineWidth+1, (unsigned) 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, NULL, - polyPtr->numPoints, polyPtr->splineSteps, NULL, NULL); - if (numPoints <= MAX_STATIC_POINTS) { - pointPtr = staticPoints; - } else { - pointPtr = ckalloc(numPoints * sizeof(XPoint)); - } - numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr, - polyPtr->numPoints, polyPtr->splineSteps, pointPtr, 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(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( - 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 *newCoordPtr; - Tk_State state = itemPtr->state; - - if (state == TK_STATE_NULL) { - state = Canvas(canvas)->canvas_state; - } - - if (!obj || (Tcl_ListObjGetElements(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; - } - newCoordPtr = ckalloc(sizeof(double) * (length + 2 + objc)); - for (i=0; i<beforeThis; i++) { - newCoordPtr[i] = polyPtr->coordPtr[i]; - } - for (i=0; i<objc; i++) { - if (Tcl_GetDoubleFromObj(NULL, objv[i], - &newCoordPtr[i+beforeThis]) != TCL_OK){ - ckfree(newCoordPtr); - return; - } - } - - for (i=beforeThis; i<length; i++) { - newCoordPtr[i+objc] = polyPtr->coordPtr[i]; - } - if (polyPtr->coordPtr) { - ckfree(polyPtr->coordPtr); - } - length += objc; - polyPtr->coordPtr = newCoordPtr; - 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 ((newCoordPtr[length-2] == newCoordPtr[0]) - && (newCoordPtr[length-1] == newCoordPtr[1])) { - polyPtr->autoClosed = 0; - polyPtr->numPoints--; - } - } else { - if ((newCoordPtr[length-2] != newCoordPtr[0]) - || (newCoordPtr[length-1] != newCoordPtr[1])) { - polyPtr->autoClosed = 1; - polyPtr->numPoints++; - } - } - - newCoordPtr[length] = newCoordPtr[0]; - newCoordPtr[length+1] = newCoordPtr[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 careful; beforeThis could now be negative - */ - - for (i=beforeThis; i<beforeThis+objc; i+=2) { - j = i; - if (j < 0) { - j += length; - } else if (j >= length) { - j -= length; - } - TkIncludePoint(itemPtr, polyPtr->coordPtr+j); - } - width = polyPtr->outline.width; - if (Canvas(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( - 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(polyPtr->coordPtr); - polyPtr->coordPtr = NULL; - } - 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( - 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 = Canvas(canvas)->canvas_state; - } - width = polyPtr->outline.width; - if (Canvas(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, NULL, - polyPtr->numPoints, polyPtr->splineSteps, NULL, NULL); - if (numPoints <= MAX_STATIC_POINTS) { - polyPoints = staticSpace; - } else { - polyPoints = ckalloc(2 * numPoints * sizeof(double)); - } - numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr, - polyPtr->numPoints, polyPtr->splineSteps, 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(polyPoints); - } - return bestDist; -} - -/* - *-------------------------------------------------------------- - * - * PolygonToArea -- - * - * This function 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( - 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 = Canvas(canvas)->canvas_state; - } - - width = polyPtr->outline.width; - if (Canvas(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, NULL, - polyPtr->numPoints, polyPtr->splineSteps, NULL, NULL); - if (numPoints <= MAX_STATIC_POINTS) { - polyPoints = staticSpace; - } else { - polyPoints = ckalloc(2 * numPoints * sizeof(double)); - } - numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr, - polyPtr->numPoints, polyPtr->splineSteps, 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(polyPoints); - } - return inside; -} - -/* - *-------------------------------------------------------------- - * - * ScalePolygon -- - * - * This function 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( - Tk_Canvas canvas, /* Canvas containing polygon. */ - Tk_Item *itemPtr, /* Polygon to be scaled. */ - double originX, double 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( - 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; - const char *string = Tcl_GetString(obj); - - if (string[0] == 'e') { - if (strncmp(string, "end", obj->length) != 0) { - goto badIndex; - } - *indexPtr = 2*(polyPtr->numPoints - polyPtr->autoClosed); - } else if (string[0] == '@') { - int i; - double x, y, bestDist, dist, *coordPtr; - char *end; - const char *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) { - *indexPtr = 0; - } else if (*indexPtr > 0) { - *indexPtr = ((*indexPtr - 2) % count) + 2; - } else { - *indexPtr = -((-(*indexPtr)) % count); - } - } - return TCL_OK; - - /* - * Some of the paths here leave messages in interp->result, so we have to - * clear it out before storing our own message. - */ - - badIndex: - Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad index \"%s\"", string)); - Tcl_SetErrorCode(interp, "TK", "CANVAS", "ITEM_INDEX", "POLY", NULL); - return TCL_ERROR; -} - -/* - *-------------------------------------------------------------- - * - * TranslatePolygon -- - * - * This function 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( - Tk_Canvas canvas, /* Canvas containing item. */ - Tk_Item *itemPtr, /* Item that is being moved. */ - double deltaX, double 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 function 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( - 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; - int style; - XColor *color; - XColor *fillColor; - Pixmap stipple; - Pixmap fillStipple; - Tk_State state = itemPtr->state; - double width; - Tcl_Obj *psObj; - Tcl_InterpState interpState; - - if (polyPtr->numPoints < 2 || polyPtr->coordPtr == NULL) { - return TCL_OK; - } - - if (state == TK_STATE_NULL) { - state = Canvas(canvas)->canvas_state; - } - width = polyPtr->outline.width; - color = polyPtr->outline.color; - stipple = polyPtr->fillStipple; - fillColor = polyPtr->fillColor; - fillStipple = polyPtr->fillStipple; - if (Canvas(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; - } - } - - /* - * Make our working space. - */ - - psObj = Tcl_NewObj(); - interpState = Tcl_SaveInterpState(interp, TCL_OK); - - if (polyPtr->numPoints == 2) { - if (color == NULL) { - goto done; - } - - /* - * Create a point by using a small circle. (Printer pixels are too - * tiny to be used directly...) - */ - - Tcl_AppendPrintfToObj(psObj, - "matrix currentmatrix\n" /* save state */ - "%.15g %.15g translate " /* go to drawing location */ - "%.15g %.15g scale " /* scale the drawing */ - "1 0 moveto " /* correct for origin */ - "0 0 1 0 360 arc\n" /* make the circle */ - "setmatrix\n", /* restore state */ - polyPtr->coordPtr[0], - Tk_CanvasPsY(canvas, polyPtr->coordPtr[1]), - width/2.0, width/2.0); - - /* - * Color it in. - */ - - Tcl_ResetResult(interp); - if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) { - goto error; - } - Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); - - if (stipple != None) { - Tcl_AppendToObj(psObj, "clip ", -1); - - Tcl_ResetResult(interp); - if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) { - goto error; - } - Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); - } else { - Tcl_AppendToObj(psObj, "fill\n", -1); - } - goto done; - } - - /* - * Fill the area of the polygon. - */ - - if (fillColor != NULL && polyPtr->numPoints > 3) { - Tcl_ResetResult(interp); - 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) { - goto error; - } - Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); - - if (fillStipple != None) { - Tcl_AppendToObj(psObj, "eoclip ", -1); - - Tcl_ResetResult(interp); - if (Tk_CanvasPsStipple(interp, canvas, fillStipple) != TCL_OK) { - goto error; - } - Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); - - if (color != NULL) { - Tcl_AppendToObj(psObj, "grestore gsave\n", -1); - } - } else { - Tcl_AppendToObj(psObj, "eofill\n", -1); - } - } - - /* - * Now draw the outline, if there is one. - */ - - if (color != NULL) { - Tcl_ResetResult(interp); - 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); - } - Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); - - if (polyPtr->joinStyle == JoinRound) { - style = 1; - } else if (polyPtr->joinStyle == JoinBevel) { - style = 2; - } else { - style = 0; - } - Tcl_AppendPrintfToObj(psObj, "%d setlinejoin 1 setlinecap\n", style); - - Tcl_ResetResult(interp); - if (Tk_CanvasPsOutline(canvas, itemPtr, &polyPtr->outline) != TCL_OK){ - goto error; - } - Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); - } - - /* - * Plug the accumulated postscript back into the result. - */ - - done: - (void) Tcl_RestoreInterpState(interp, interpState); - Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj); - Tcl_DecrRefCount(psObj); - return TCL_OK; - - error: - Tcl_DiscardInterpState(interpState); - Tcl_DecrRefCount(psObj); - return TCL_ERROR; -} - -/* - * Local Variables: - * mode: c - * c-basic-offset: 4 - * fill-column: 78 - * End: - */ |