diff options
Diffstat (limited to 'tk8.6/generic/tkCanvPoly.c')
| -rw-r--r-- | tk8.6/generic/tkCanvPoly.c | 1999 |
1 files changed, 1999 insertions, 0 deletions
diff --git a/tk8.6/generic/tkCanvPoly.c b/tk8.6/generic/tkCanvPoly.c new file mode 100644 index 0000000..b4ef098 --- /dev/null +++ b/tk8.6/generic/tkCanvPoly.c @@ -0,0 +1,1999 @@ +/* + * 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: + */ |