tkCanvArc.c
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上传日期:2015-12-11
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- /*
- * tkCanvArc.c --
- *
- * This file implements arc items for canvas widgets.
- *
- * Copyright (c) 1992-1994 The Regents of the University of California.
- * Copyright (c) 1994-1997 Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tkCanvArc.c,v 1.11 2003/02/09 07:48:22 hobbs Exp $
- */
- #include <stdio.h>
- #include "tkPort.h"
- #include "tkInt.h"
- #include "tkCanvas.h"
- /*
- * The structure below defines the record for each arc item.
- */
- typedef enum {
- PIESLICE_STYLE, CHORD_STYLE, ARC_STYLE
- } Style;
- typedef struct ArcItem {
- Tk_Item header; /* Generic stuff that's the same for all
- * types. MUST BE FIRST IN STRUCTURE. */
- Tk_Outline outline; /* Outline structure */
- double bbox[4]; /* Coordinates (x1, y1, x2, y2) of bounding
- * box for oval of which arc is a piece. */
- double start; /* Angle at which arc begins, in degrees
- * between 0 and 360. */
- double extent; /* Extent of arc (angular distance from
- * start to end of arc) in degrees between
- * -360 and 360. */
- double *outlinePtr; /* Points to (x,y) coordinates for points
- * that define one or two closed polygons
- * representing the portion of the outline
- * that isn't part of the arc (the V-shape
- * for a pie slice or a line-like segment
- * for a chord). Malloc'ed. */
- int numOutlinePoints; /* Number of points at outlinePtr. Zero
- * means no space allocated. */
- Tk_TSOffset tsoffset;
- XColor *fillColor; /* Color for filling arc (used for drawing
- * outline too when style is "arc"). NULL
- * means don't fill arc. */
- XColor *activeFillColor; /* Color for filling arc (used for drawing
- * outline too when style is "arc" and state
- * is "active"). NULL means use fillColor. */
- XColor *disabledFillColor; /* Color for filling arc (used for drawing
- * outline too when style is "arc" and state
- * is "disabled". NULL means use fillColor */
- Pixmap fillStipple; /* Stipple bitmap for filling item. */
- Pixmap activeFillStipple; /* Stipple bitmap for filling item if state
- * is active. */
- Pixmap disabledFillStipple; /* Stipple bitmap for filling item if state
- * is disabled. */
- Style style; /* How to draw arc: arc, chord, or pieslice. */
- GC fillGC; /* Graphics context for filling item. */
- double center1[2]; /* Coordinates of center of arc outline at
- * start (see ComputeArcOutline). */
- double center2[2]; /* Coordinates of center of arc outline at
- * start+extent (see ComputeArcOutline). */
- } ArcItem;
- /*
- * The definitions below define the sizes of the polygons used to
- * display outline information for various styles of arcs:
- */
- #define CHORD_OUTLINE_PTS 7
- #define PIE_OUTLINE1_PTS 6
- #define PIE_OUTLINE2_PTS 7
- /*
- * Information used for parsing configuration specs:
- */
- static int StyleParseProc _ANSI_ARGS_((
- ClientData clientData, Tcl_Interp *interp,
- Tk_Window tkwin, CONST char *value,
- char *widgRec, int offset));
- static char * StylePrintProc _ANSI_ARGS_((
- ClientData clientData, Tk_Window tkwin,
- char *widgRec, int offset,
- Tcl_FreeProc **freeProcPtr));
- static Tk_CustomOption stateOption = {
- (Tk_OptionParseProc *) TkStateParseProc,
- TkStatePrintProc, (ClientData) 2
- };
- static Tk_CustomOption styleOption = {
- (Tk_OptionParseProc *) StyleParseProc,
- StylePrintProc, (ClientData) NULL
- };
- static Tk_CustomOption tagsOption = {
- (Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
- Tk_CanvasTagsPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption dashOption = {
- (Tk_OptionParseProc *) TkCanvasDashParseProc,
- TkCanvasDashPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption offsetOption = {
- (Tk_OptionParseProc *) TkOffsetParseProc,
- TkOffsetPrintProc, (ClientData) (TK_OFFSET_RELATIVE)
- };
- static Tk_CustomOption pixelOption = {
- (Tk_OptionParseProc *) TkPixelParseProc,
- TkPixelPrintProc, (ClientData) NULL
- };
- static Tk_ConfigSpec configSpecs[] = {
- {TK_CONFIG_CUSTOM, "-activedash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.activeDash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, activeFillColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_COLOR, "-activeoutline", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.activeColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-activeoutlinestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.activeStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, activeFillStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-activewidth", (char *) NULL, (char *) NULL,
- "0.0", Tk_Offset(ArcItem, outline.activeWidth),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_CUSTOM, "-dash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.dash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_PIXELS, "-dashoffset", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(ArcItem, outline.offset), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-disableddash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.disabledDash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, disabledFillColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_COLOR, "-disabledoutline", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.disabledColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-disabledoutlinestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.disabledStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, disabledFillStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-disabledwidth", (char *) NULL, (char *) NULL,
- "0.0", Tk_Offset(ArcItem, outline.disabledWidth),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_DOUBLE, "-extent", (char *) NULL, (char *) NULL,
- "90", Tk_Offset(ArcItem, extent), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, fillColor), TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
- "0,0", Tk_Offset(ArcItem, tsoffset),
- TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
- {TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
- "black", Tk_Offset(ArcItem, outline.color), TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-outlineoffset", (char *) NULL, (char *) NULL,
- "0,0", Tk_Offset(ArcItem, outline.tsoffset),
- TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
- {TK_CONFIG_BITMAP, "-outlinestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, outline.stipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_DOUBLE, "-start", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(ArcItem, start), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
- &stateOption},
- {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, fillStipple), TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-style", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(ArcItem, style), TK_CONFIG_DONT_SET_DEFAULT,
- &styleOption},
- {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
- (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
- {TK_CONFIG_CUSTOM, "-width", (char *) NULL, (char *) NULL,
- "1.0", Tk_Offset(ArcItem, outline.width), TK_CONFIG_DONT_SET_DEFAULT,
- &pixelOption},
- {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
- (char *) NULL, 0, 0}
- };
- /*
- * Prototypes for procedures defined in this file:
- */
- static void ComputeArcBbox _ANSI_ARGS_((Tk_Canvas canvas,
- ArcItem *arcPtr));
- static int ConfigureArc _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
- Tcl_Obj *CONST objv[], int flags));
- static int CreateArc _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, struct Tk_Item *itemPtr,
- int objc, Tcl_Obj *CONST objv[]));
- static void DeleteArc _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, Display *display));
- static void DisplayArc _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, Display *display, Drawable dst,
- int x, int y, int width, int height));
- static int ArcCoords _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
- Tcl_Obj *CONST objv[]));
- static int ArcToArea _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double *rectPtr));
- static double ArcToPoint _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double *coordPtr));
- static int ArcToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
- static void ScaleArc _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double originX, double originY,
- double scaleX, double scaleY));
- static void TranslateArc _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double deltaX, double deltaY));
- static int AngleInRange _ANSI_ARGS_((double x, double y,
- double start, double extent));
- static void ComputeArcOutline _ANSI_ARGS_((Tk_Canvas canvas,
- ArcItem *arcPtr));
- static int HorizLineToArc _ANSI_ARGS_((double x1, double x2,
- double y, double rx, double ry,
- double start, double extent));
- static int VertLineToArc _ANSI_ARGS_((double x, double y1,
- double y2, double rx, double ry,
- double start, double extent));
- /*
- * The structures below defines the arc item types by means of procedures
- * that can be invoked by generic item code.
- */
- Tk_ItemType tkArcType = {
- "arc", /* name */
- sizeof(ArcItem), /* itemSize */
- CreateArc, /* createProc */
- configSpecs, /* configSpecs */
- ConfigureArc, /* configureProc */
- ArcCoords, /* coordProc */
- DeleteArc, /* deleteProc */
- DisplayArc, /* displayProc */
- TK_CONFIG_OBJS, /* flags */
- ArcToPoint, /* pointProc */
- ArcToArea, /* areaProc */
- ArcToPostscript, /* postscriptProc */
- ScaleArc, /* scaleProc */
- TranslateArc, /* translateProc */
- (Tk_ItemIndexProc *) NULL, /* indexProc */
- (Tk_ItemCursorProc *) NULL, /* icursorProc */
- (Tk_ItemSelectionProc *) NULL, /* selectionProc */
- (Tk_ItemInsertProc *) NULL, /* insertProc */
- (Tk_ItemDCharsProc *) NULL, /* dTextProc */
- (Tk_ItemType *) NULL, /* nextPtr */
- };
- #ifndef PI
- # define PI 3.14159265358979323846
- #endif
- /*
- *--------------------------------------------------------------
- *
- * CreateArc --
- *
- * This procedure is invoked to create a new arc 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 arc item is created.
- *
- *--------------------------------------------------------------
- */
- static int
- CreateArc(interp, canvas, itemPtr, objc, objv)
- Tcl_Interp *interp; /* Interpreter for error reporting. */
- Tk_Canvas canvas; /* Canvas to hold new item. */
- Tk_Item *itemPtr; /* Record to hold new item; header
- * has been initialized by caller. */
- int objc; /* Number of arguments in objv. */
- Tcl_Obj *CONST objv[]; /* Arguments describing arc. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- int i;
- if (objc == 0) {
- panic("canvas did not pass any coordsn");
- }
- /*
- * Carry out initialization that is needed in order to clean
- * up after errors during the the remainder of this procedure.
- */
- Tk_CreateOutline(&(arcPtr->outline));
- arcPtr->start = 0;
- arcPtr->extent = 90;
- arcPtr->outlinePtr = NULL;
- arcPtr->numOutlinePoints = 0;
- arcPtr->tsoffset.flags = 0;
- arcPtr->tsoffset.xoffset = 0;
- arcPtr->tsoffset.yoffset = 0;
- arcPtr->fillColor = NULL;
- arcPtr->activeFillColor = NULL;
- arcPtr->disabledFillColor = NULL;
- arcPtr->fillStipple = None;
- arcPtr->activeFillStipple = None;
- arcPtr->disabledFillStipple = None;
- arcPtr->style = PIESLICE_STYLE;
- arcPtr->fillGC = None;
- /*
- * Process the arguments to fill in the item record.
- */
- for (i = 1; i < objc; i++) {
- char *arg = Tcl_GetString(objv[i]);
- if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
- break;
- }
- }
- if (ArcCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
- goto error;
- }
- if (ConfigureArc(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
- return TCL_OK;
- }
- error:
- DeleteArc(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
- return TCL_ERROR;
- }
- /*
- *--------------------------------------------------------------
- *
- * ArcCoords --
- *
- * This procedure is invoked to process the "coords" widget
- * command on arcs. 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
- ArcCoords(interp, canvas, itemPtr, objc, objv)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item whose coordinates are to be
- * read or modified. */
- int objc; /* Number of coordinates supplied in
- * objv. */
- Tcl_Obj *CONST objv[]; /* Array of coordinates: x1, y1,
- * x2, y2, ... */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- if (objc == 0) {
- Tcl_Obj *obj = Tcl_NewObj();
- Tcl_Obj *subobj = Tcl_NewDoubleObj(arcPtr->bbox[0]);
- Tcl_ListObjAppendElement(interp, obj, subobj);
- subobj = Tcl_NewDoubleObj(arcPtr->bbox[1]);
- Tcl_ListObjAppendElement(interp, obj, subobj);
- subobj = Tcl_NewDoubleObj(arcPtr->bbox[2]);
- Tcl_ListObjAppendElement(interp, obj, subobj);
- subobj = Tcl_NewDoubleObj(arcPtr->bbox[3]);
- Tcl_ListObjAppendElement(interp, obj, subobj);
- Tcl_SetObjResult(interp, obj);
- } else if ((objc == 1)||(objc == 4)) {
- if (objc==1) {
- if (Tcl_ListObjGetElements(interp, objv[0], &objc,
- (Tcl_Obj ***) &objv) != TCL_OK) {
- return TCL_ERROR;
- } else if (objc != 4) {
- char buf[64 + TCL_INTEGER_SPACE];
-
- sprintf(buf, "wrong # coordinates: expected 4, got %d", objc);
- Tcl_SetResult(interp, buf, TCL_VOLATILE);
- return TCL_ERROR;
- }
- }
- if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],
- &arcPtr->bbox[0]) != TCL_OK)
- || (Tk_CanvasGetCoordFromObj(interp, canvas, objv[1],
- &arcPtr->bbox[1]) != TCL_OK)
- || (Tk_CanvasGetCoordFromObj(interp, canvas, objv[2],
- &arcPtr->bbox[2]) != TCL_OK)
- || (Tk_CanvasGetCoordFromObj(interp, canvas, objv[3],
- &arcPtr->bbox[3]) != TCL_OK)) {
- return TCL_ERROR;
- }
- ComputeArcBbox(canvas, arcPtr);
- } else {
- char buf[64 + TCL_INTEGER_SPACE];
-
- sprintf(buf, "wrong # coordinates: expected 0 or 4, got %d", objc);
- Tcl_SetResult(interp, buf, TCL_VOLATILE);
- return TCL_ERROR;
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * ConfigureArc --
- *
- * This procedure is invoked to configure various aspects
- * of a arc item, such as its outline and fill colors.
- *
- * 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
- ConfigureArc(interp, canvas, itemPtr, objc, objv, flags)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing itemPtr. */
- Tk_Item *itemPtr; /* Arc 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. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- XGCValues gcValues;
- GC newGC;
- unsigned long mask;
- int i;
- Tk_Window tkwin;
- Tk_TSOffset *tsoffset;
- XColor *color;
- Pixmap stipple;
- Tk_State state;
- tkwin = Tk_CanvasTkwin(canvas);
- if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
- (CONST char **) objv, (char *) arcPtr, flags|TK_CONFIG_OBJS)) {
- return TCL_ERROR;
- }
- state = itemPtr->state;
- /*
- * A few of the options require additional processing, such as
- * style and graphics contexts.
- */
- if (arcPtr->outline.activeWidth > arcPtr->outline.width ||
- arcPtr->outline.activeDash.number != 0 ||
- arcPtr->outline.activeColor != NULL ||
- arcPtr->outline.activeStipple != None ||
- arcPtr->activeFillColor != NULL ||
- arcPtr->activeFillStipple != None) {
- itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
- } else {
- itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
- }
- tsoffset = &arcPtr->outline.tsoffset;
- flags = tsoffset->flags;
- if (flags & TK_OFFSET_LEFT) {
- tsoffset->xoffset = (int) (arcPtr->bbox[0] + 0.5);
- } else if (flags & TK_OFFSET_CENTER) {
- tsoffset->xoffset = (int) ((arcPtr->bbox[0]+arcPtr->bbox[2]+1)/2);
- } else if (flags & TK_OFFSET_RIGHT) {
- tsoffset->xoffset = (int) (arcPtr->bbox[2] + 0.5);
- }
- if (flags & TK_OFFSET_TOP) {
- tsoffset->yoffset = (int) (arcPtr->bbox[1] + 0.5);
- } else if (flags & TK_OFFSET_MIDDLE) {
- tsoffset->yoffset = (int) ((arcPtr->bbox[1]+arcPtr->bbox[3]+1)/2);
- } else if (flags & TK_OFFSET_BOTTOM) {
- tsoffset->yoffset = (int) (arcPtr->bbox[2] + 0.5);
- }
- i = (int) (arcPtr->start/360.0);
- arcPtr->start -= i*360.0;
- if (arcPtr->start < 0) {
- arcPtr->start += 360.0;
- }
- i = (int) (arcPtr->extent/360.0);
- arcPtr->extent -= i*360.0;
- mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr,
- &(arcPtr->outline));
- if (mask) {
- gcValues.cap_style = CapButt;
- mask |= GCCapStyle;
- newGC = Tk_GetGC(tkwin, mask, &gcValues);
- } else {
- newGC = None;
- }
- if (arcPtr->outline.gc != None) {
- Tk_FreeGC(Tk_Display(tkwin), arcPtr->outline.gc);
- }
- arcPtr->outline.gc = newGC;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (state==TK_STATE_HIDDEN) {
- ComputeArcBbox(canvas, arcPtr);
- return TCL_OK;
- }
- color = arcPtr->fillColor;
- stipple = arcPtr->fillStipple;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (arcPtr->activeFillColor!=NULL) {
- color = arcPtr->activeFillColor;
- }
- if (arcPtr->activeFillStipple!=None) {
- stipple = arcPtr->activeFillStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (arcPtr->disabledFillColor!=NULL) {
- color = arcPtr->disabledFillColor;
- }
- if (arcPtr->disabledFillStipple!=None) {
- stipple = arcPtr->disabledFillStipple;
- }
- }
- if (arcPtr->style == ARC_STYLE) {
- newGC = None;
- } else if (color == NULL) {
- newGC = None;
- } else {
- gcValues.foreground = color->pixel;
- if (arcPtr->style == CHORD_STYLE) {
- gcValues.arc_mode = ArcChord;
- } else {
- gcValues.arc_mode = ArcPieSlice;
- }
- mask = GCForeground|GCArcMode;
- if (stipple != None) {
- gcValues.stipple = stipple;
- gcValues.fill_style = FillStippled;
- mask |= GCStipple|GCFillStyle;
- }
- newGC = Tk_GetGC(tkwin, mask, &gcValues);
- }
- if (arcPtr->fillGC != None) {
- Tk_FreeGC(Tk_Display(tkwin), arcPtr->fillGC);
- }
- arcPtr->fillGC = newGC;
- tsoffset = &arcPtr->tsoffset;
- flags = tsoffset->flags;
- if (flags & TK_OFFSET_LEFT) {
- tsoffset->xoffset = (int) (arcPtr->bbox[0] + 0.5);
- } else if (flags & TK_OFFSET_CENTER) {
- tsoffset->xoffset = (int) ((arcPtr->bbox[0]+arcPtr->bbox[2]+1)/2);
- } else if (flags & TK_OFFSET_RIGHT) {
- tsoffset->xoffset = (int) (arcPtr->bbox[2] + 0.5);
- }
- if (flags & TK_OFFSET_TOP) {
- tsoffset->yoffset = (int) (arcPtr->bbox[1] + 0.5);
- } else if (flags & TK_OFFSET_MIDDLE) {
- tsoffset->yoffset = (int) ((arcPtr->bbox[1]+arcPtr->bbox[3]+1)/2);
- } else if (flags & TK_OFFSET_BOTTOM) {
- tsoffset->yoffset = (int) (arcPtr->bbox[3] + 0.5);
- }
- ComputeArcBbox(canvas, arcPtr);
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * DeleteArc --
- *
- * This procedure is called to clean up the data structure
- * associated with a arc item.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Resources associated with itemPtr are released.
- *
- *--------------------------------------------------------------
- */
- static void
- DeleteArc(canvas, itemPtr, display)
- Tk_Canvas canvas; /* Info about overall canvas. */
- Tk_Item *itemPtr; /* Item that is being deleted. */
- Display *display; /* Display containing window for
- * canvas. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- Tk_DeleteOutline(display, &(arcPtr->outline));
- if (arcPtr->numOutlinePoints != 0) {
- ckfree((char *) arcPtr->outlinePtr);
- }
- if (arcPtr->fillColor != NULL) {
- Tk_FreeColor(arcPtr->fillColor);
- }
- if (arcPtr->activeFillColor != NULL) {
- Tk_FreeColor(arcPtr->activeFillColor);
- }
- if (arcPtr->disabledFillColor != NULL) {
- Tk_FreeColor(arcPtr->disabledFillColor);
- }
- if (arcPtr->fillStipple != None) {
- Tk_FreeBitmap(display, arcPtr->fillStipple);
- }
- if (arcPtr->activeFillStipple != None) {
- Tk_FreeBitmap(display, arcPtr->activeFillStipple);
- }
- if (arcPtr->disabledFillStipple != None) {
- Tk_FreeBitmap(display, arcPtr->disabledFillStipple);
- }
- if (arcPtr->fillGC != None) {
- Tk_FreeGC(display, arcPtr->fillGC);
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * ComputeArcBbox --
- *
- * This procedure is invoked to compute the bounding box of
- * all the pixels that may be drawn as part of an arc.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The fields x1, y1, x2, and y2 are updated in the header
- * for itemPtr.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static void
- ComputeArcBbox(canvas, arcPtr)
- Tk_Canvas canvas; /* Canvas that contains item. */
- ArcItem *arcPtr; /* Item whose bbox is to be
- * recomputed. */
- {
- double tmp, center[2], point[2];
- double width;
- Tk_State state = arcPtr->header.state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = arcPtr->outline.width;
- if (width < 1.0) {
- width = 1.0;
- }
- if (state==TK_STATE_HIDDEN) {
- arcPtr->header.x1 = arcPtr->header.x2 =
- arcPtr->header.y1 = arcPtr->header.y2 = -1;
- return;
- } else if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *) arcPtr) {
- if (arcPtr->outline.activeWidth>width) {
- width = arcPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (arcPtr->outline.disabledWidth>0) {
- width = arcPtr->outline.disabledWidth;
- }
- }
- /*
- * Make sure that the first coordinates are the lowest ones.
- */
- if (arcPtr->bbox[1] > arcPtr->bbox[3]) {
- double tmp;
- tmp = arcPtr->bbox[3];
- arcPtr->bbox[3] = arcPtr->bbox[1];
- arcPtr->bbox[1] = tmp;
- }
- if (arcPtr->bbox[0] > arcPtr->bbox[2]) {
- double tmp;
- tmp = arcPtr->bbox[2];
- arcPtr->bbox[2] = arcPtr->bbox[0];
- arcPtr->bbox[0] = tmp;
- }
- ComputeArcOutline(canvas,arcPtr);
- /*
- * To compute the bounding box, start with the the bbox formed
- * by the two endpoints of the arc. Then add in the center of
- * the arc's oval (if relevant) and the 3-o'clock, 6-o'clock,
- * 9-o'clock, and 12-o'clock positions, if they are relevant.
- */
- arcPtr->header.x1 = arcPtr->header.x2 = (int) arcPtr->center1[0];
- arcPtr->header.y1 = arcPtr->header.y2 = (int) arcPtr->center1[1];
- TkIncludePoint((Tk_Item *) arcPtr, arcPtr->center2);
- center[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2;
- center[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2;
- if (arcPtr->style == PIESLICE_STYLE) {
- TkIncludePoint((Tk_Item *) arcPtr, center);
- }
- tmp = -arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- point[0] = arcPtr->bbox[2];
- point[1] = center[1];
- TkIncludePoint((Tk_Item *) arcPtr, point);
- }
- tmp = 90.0 - arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- point[0] = center[0];
- point[1] = arcPtr->bbox[1];
- TkIncludePoint((Tk_Item *) arcPtr, point);
- }
- tmp = 180.0 - arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- point[0] = arcPtr->bbox[0];
- point[1] = center[1];
- TkIncludePoint((Tk_Item *) arcPtr, point);
- }
- tmp = 270.0 - arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- point[0] = center[0];
- point[1] = arcPtr->bbox[3];
- TkIncludePoint((Tk_Item *) arcPtr, point);
- }
- /*
- * Lastly, expand by the width of the arc (if the arc's outline is
- * being drawn) and add one extra pixel just for safety.
- */
- if (arcPtr->outline.gc == None) {
- tmp = 1;
- } else {
- tmp = (int) ((width + 1.0)/2.0 + 1);
- }
- arcPtr->header.x1 -= (int) tmp;
- arcPtr->header.y1 -= (int) tmp;
- arcPtr->header.x2 += (int) tmp;
- arcPtr->header.y2 += (int) tmp;
- }
- /*
- *--------------------------------------------------------------
- *
- * DisplayArc --
- *
- * This procedure is invoked to draw an arc item in a given
- * drawable.
- *
- * Results:
- * None.
- *
- * Side effects:
- * ItemPtr is drawn in drawable using the transformation
- * information in canvas.
- *
- *--------------------------------------------------------------
- */
- static void
- DisplayArc(canvas, itemPtr, display, drawable, x, y, width, height)
- Tk_Canvas canvas; /* Canvas that contains item. */
- Tk_Item *itemPtr; /* Item to be displayed. */
- Display *display; /* Display on which to draw item. */
- Drawable drawable; /* Pixmap or window in which to draw
- * item. */
- int x, y, width, height; /* Describes region of canvas that
- * must be redisplayed (not used). */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- short x1, y1, x2, y2;
- int start, extent, dashnumber;
- double lineWidth;
- Tk_State state = itemPtr->state;
- Pixmap stipple;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- lineWidth = arcPtr->outline.width;
- if (lineWidth < 1.0) {
- lineWidth = 1.0;
- }
- dashnumber = arcPtr->outline.dash.number;
- stipple = arcPtr->fillStipple;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (arcPtr->outline.activeWidth>lineWidth) {
- lineWidth = arcPtr->outline.activeWidth;
- }
- if (arcPtr->outline.activeDash.number != 0) {
- dashnumber = arcPtr->outline.activeDash.number;
- }
- if (arcPtr->activeFillStipple != None) {
- stipple = arcPtr->activeFillStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (arcPtr->outline.disabledWidth > 0) {
- lineWidth = arcPtr->outline.disabledWidth;
- }
- if (arcPtr->outline.disabledDash.number != 0) {
- dashnumber = arcPtr->outline.disabledDash.number;
- }
- if (arcPtr->disabledFillStipple != None) {
- stipple = arcPtr->disabledFillStipple;
- }
- }
- /*
- * Compute the screen coordinates of the bounding box for the item,
- * plus integer values for the angles.
- */
- Tk_CanvasDrawableCoords(canvas, arcPtr->bbox[0], arcPtr->bbox[1],
- &x1, &y1);
- Tk_CanvasDrawableCoords(canvas, arcPtr->bbox[2], arcPtr->bbox[3],
- &x2, &y2);
- if (x2 <= x1) {
- x2 = x1+1;
- }
- if (y2 <= y1) {
- y2 = y1+1;
- }
- start = (int) ((64*arcPtr->start) + 0.5);
- extent = (int) ((64*arcPtr->extent) + 0.5);
- /*
- * Display filled arc first (if wanted), then outline. If the extent
- * is zero then don't invoke XFillArc or XDrawArc, since this causes
- * some window servers to crash and should be a no-op anyway.
- */
- if ((arcPtr->fillGC != None) && (extent != 0)) {
- if (stipple != None) {
- int w=0; int h=0;
- Tk_TSOffset *tsoffset = &arcPtr->tsoffset;
- int flags = tsoffset->flags;
- if (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, arcPtr->fillGC, tsoffset);
- if (tsoffset) {
- tsoffset->xoffset += w;
- tsoffset->yoffset += h;
- }
- }
- XFillArc(display, drawable, arcPtr->fillGC, x1, y1, (unsigned) (x2-x1),
- (unsigned) (y2-y1), start, extent);
- if (stipple != None) {
- XSetTSOrigin(display, arcPtr->fillGC, 0, 0);
- }
- }
- if (arcPtr->outline.gc != None) {
- Tk_ChangeOutlineGC(canvas, itemPtr, &(arcPtr->outline));
- if (extent != 0) {
- XDrawArc(display, drawable, arcPtr->outline.gc, x1, y1,
- (unsigned) (x2-x1), (unsigned) (y2-y1), start, extent);
- }
- /*
- * If the outline width is very thin, don't use polygons to draw
- * the linear parts of the outline (this often results in nothing
- * being displayed); just draw lines instead. The same is done if
- * the outline is dashed, because then polygons don't work.
- */
- if (lineWidth < 1.5 || dashnumber != 0) {
- Tk_CanvasDrawableCoords(canvas, arcPtr->center1[0],
- arcPtr->center1[1], &x1, &y1);
- Tk_CanvasDrawableCoords(canvas, arcPtr->center2[0],
- arcPtr->center2[1], &x2, &y2);
- if (arcPtr->style == CHORD_STYLE) {
- XDrawLine(display, drawable, arcPtr->outline.gc,
- x1, y1, x2, y2);
- } else if (arcPtr->style == PIESLICE_STYLE) {
- short cx, cy;
- Tk_CanvasDrawableCoords(canvas,
- (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0,
- (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0, &cx, &cy);
- XDrawLine(display, drawable, arcPtr->outline.gc,
- cx, cy, x1, y1);
- XDrawLine(display, drawable, arcPtr->outline.gc,
- cx, cy, x2, y2);
- }
- } else {
- if (arcPtr->style == CHORD_STYLE) {
- TkFillPolygon(canvas, arcPtr->outlinePtr, CHORD_OUTLINE_PTS,
- display, drawable, arcPtr->outline.gc, None);
- } else if (arcPtr->style == PIESLICE_STYLE) {
- TkFillPolygon(canvas, arcPtr->outlinePtr, PIE_OUTLINE1_PTS,
- display, drawable, arcPtr->outline.gc, None);
- TkFillPolygon(canvas, arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
- PIE_OUTLINE2_PTS, display, drawable, arcPtr->outline.gc,
- None);
- }
- }
- Tk_ResetOutlineGC(canvas, itemPtr, &(arcPtr->outline));
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * ArcToPoint --
- *
- * Computes the distance from a given point to a given
- * arc, in canvas units.
- *
- * Results:
- * The return value is 0 if the point whose x and y coordinates
- * are coordPtr[0] and coordPtr[1] is inside the arc. If the
- * point isn't inside the arc then the return value is the
- * distance from the point to the arc. If itemPtr is filled,
- * then anywhere in the interior is considered "inside"; if
- * itemPtr isn't filled, then "inside" means only the area
- * occupied by the outline.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static double
- ArcToPoint(canvas, itemPtr, pointPtr)
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item to check against point. */
- double *pointPtr; /* Pointer to x and y coordinates. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- double vertex[2], pointAngle, diff, dist, newDist;
- double poly[8], polyDist, width, t1, t2;
- int filled, angleInRange;
- Tk_State state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = (double) arcPtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (arcPtr->outline.activeWidth>width) {
- width = (double) arcPtr->outline.activeWidth;
- }
- } else if (state == TK_STATE_DISABLED) {
- if (arcPtr->outline.disabledWidth>0) {
- width = (double) arcPtr->outline.disabledWidth;
- }
- }
- /*
- * See if the point is within the angular range of the arc.
- * Remember, X angles are backwards from the way we'd normally
- * think of them. Also, compensate for any eccentricity of
- * the oval.
- */
- vertex[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0;
- vertex[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0;
- t1 = arcPtr->bbox[3] - arcPtr->bbox[1];
- if (t1 != 0.0) {
- t1 = (pointPtr[1] - vertex[1]) / t1;
- }
- t2 = arcPtr->bbox[2] - arcPtr->bbox[0];
- if (t2 != 0.0) {
- t2 = (pointPtr[0] - vertex[0]) / t2;
- }
- if ((t1 == 0.0) && (t2 == 0.0)) {
- pointAngle = 0;
- } else {
- pointAngle = -atan2(t1, t2)*180/PI;
- }
- diff = pointAngle - arcPtr->start;
- diff -= ((int) (diff/360.0) * 360.0);
- if (diff < 0) {
- diff += 360.0;
- }
- angleInRange = (diff <= arcPtr->extent) ||
- ((arcPtr->extent < 0) && ((diff - 360.0) >= arcPtr->extent));
- /*
- * Now perform different tests depending on what kind of arc
- * we're dealing with.
- */
- if (arcPtr->style == ARC_STYLE) {
- if (angleInRange) {
- return TkOvalToPoint(arcPtr->bbox, width,
- 0, pointPtr);
- }
- dist = hypot(pointPtr[0] - arcPtr->center1[0],
- pointPtr[1] - arcPtr->center1[1]);
- newDist = hypot(pointPtr[0] - arcPtr->center2[0],
- pointPtr[1] - arcPtr->center2[1]);
- if (newDist < dist) {
- return newDist;
- }
- return dist;
- }
- if ((arcPtr->fillGC != None) || (arcPtr->outline.gc == None)) {
- filled = 1;
- } else {
- filled = 0;
- }
- if (arcPtr->outline.gc == None) {
- width = 0.0;
- }
- if (arcPtr->style == PIESLICE_STYLE) {
- if (width > 1.0) {
- dist = TkPolygonToPoint(arcPtr->outlinePtr, PIE_OUTLINE1_PTS,
- pointPtr);
- newDist = TkPolygonToPoint(arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
- PIE_OUTLINE2_PTS, pointPtr);
- } else {
- dist = TkLineToPoint(vertex, arcPtr->center1, pointPtr);
- newDist = TkLineToPoint(vertex, arcPtr->center2, pointPtr);
- }
- if (newDist < dist) {
- dist = newDist;
- }
- if (angleInRange) {
- newDist = TkOvalToPoint(arcPtr->bbox, width, filled, pointPtr);
- if (newDist < dist) {
- dist = newDist;
- }
- }
- return dist;
- }
- /*
- * This is a chord-style arc. We have to deal specially with the
- * triangular piece that represents the difference between a
- * chord-style arc and a pie-slice arc (for small angles this piece
- * is excluded here where it would be included for pie slices;
- * for large angles the piece is included here but would be
- * excluded for pie slices).
- */
- if (width > 1.0) {
- dist = TkPolygonToPoint(arcPtr->outlinePtr, CHORD_OUTLINE_PTS,
- pointPtr);
- } else {
- dist = TkLineToPoint(arcPtr->center1, arcPtr->center2, pointPtr);
- }
- poly[0] = poly[6] = vertex[0];
- poly[1] = poly[7] = vertex[1];
- poly[2] = arcPtr->center1[0];
- poly[3] = arcPtr->center1[1];
- poly[4] = arcPtr->center2[0];
- poly[5] = arcPtr->center2[1];
- polyDist = TkPolygonToPoint(poly, 4, pointPtr);
- if (angleInRange) {
- if ((arcPtr->extent < -180.0) || (arcPtr->extent > 180.0)
- || (polyDist > 0.0)) {
- newDist = TkOvalToPoint(arcPtr->bbox, width, filled, pointPtr);
- if (newDist < dist) {
- dist = newDist;
- }
- }
- } else {
- if ((arcPtr->extent < -180.0) || (arcPtr->extent > 180.0)) {
- if (filled && (polyDist < dist)) {
- dist = polyDist;
- }
- }
- }
- return dist;
- }
- /*
- *--------------------------------------------------------------
- *
- * ArcToArea --
- *
- * This procedure is called to determine whether an item
- * lies entirely inside, entirely outside, or overlapping
- * a given 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
- ArcToArea(canvas, itemPtr, rectPtr)
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item to check against arc. */
- double *rectPtr; /* Pointer to array of four coordinates
- * (x1, y1, x2, y2) describing rectangular
- * area. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- double rx, ry; /* Radii for transformed oval: these define
- * an oval centered at the origin. */
- double tRect[4]; /* Transformed version of x1, y1, x2, y2,
- * for coord. system where arc is centered
- * on the origin. */
- double center[2], width, angle, tmp;
- double points[20], *pointPtr;
- int numPoints, filled;
- int inside; /* Non-zero means every test so far suggests
- * that arc is inside rectangle. 0 means
- * every test so far shows arc to be outside
- * of rectangle. */
- int newInside;
- Tk_State state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = (double) arcPtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (arcPtr->outline.activeWidth>width) {
- width = (double) arcPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (arcPtr->outline.disabledWidth>0) {
- width = (double) arcPtr->outline.disabledWidth;
- }
- }
- if ((arcPtr->fillGC != None) || (arcPtr->outline.gc == None)) {
- filled = 1;
- } else {
- filled = 0;
- }
- if (arcPtr->outline.gc == None) {
- width = 0.0;
- }
- /*
- * Transform both the arc and the rectangle so that the arc's oval
- * is centered on the origin.
- */
- center[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0;
- center[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0;
- tRect[0] = rectPtr[0] - center[0];
- tRect[1] = rectPtr[1] - center[1];
- tRect[2] = rectPtr[2] - center[0];
- tRect[3] = rectPtr[3] - center[1];
- rx = arcPtr->bbox[2] - center[0] + width/2.0;
- ry = arcPtr->bbox[3] - center[1] + width/2.0;
- /*
- * Find the extreme points of the arc and see whether these are all
- * inside the rectangle (in which case we're done), partly in and
- * partly out (in which case we're done), or all outside (in which
- * case we have more work to do). The extreme points include the
- * following, which are checked in order:
- *
- * 1. The outside points of the arc, corresponding to start and
- * extent.
- * 2. The center of the arc (but only in pie-slice mode).
- * 3. The 12, 3, 6, and 9-o'clock positions (but only if the arc
- * includes those angles).
- */
- pointPtr = points;
- angle = -arcPtr->start*(PI/180.0);
- pointPtr[0] = rx*cos(angle);
- pointPtr[1] = ry*sin(angle);
- angle += -arcPtr->extent*(PI/180.0);
- pointPtr[2] = rx*cos(angle);
- pointPtr[3] = ry*sin(angle);
- numPoints = 2;
- pointPtr += 4;
- if ((arcPtr->style == PIESLICE_STYLE) && (arcPtr->extent < 180.0)) {
- pointPtr[0] = 0.0;
- pointPtr[1] = 0.0;
- numPoints++;
- pointPtr += 2;
- }
- tmp = -arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- pointPtr[0] = rx;
- pointPtr[1] = 0.0;
- numPoints++;
- pointPtr += 2;
- }
- tmp = 90.0 - arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- pointPtr[0] = 0.0;
- pointPtr[1] = -ry;
- numPoints++;
- pointPtr += 2;
- }
- tmp = 180.0 - arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- pointPtr[0] = -rx;
- pointPtr[1] = 0.0;
- numPoints++;
- pointPtr += 2;
- }
- tmp = 270.0 - arcPtr->start;
- if (tmp < 0) {
- tmp += 360.0;
- }
- if ((tmp < arcPtr->extent) || ((tmp-360) > arcPtr->extent)) {
- pointPtr[0] = 0.0;
- pointPtr[1] = ry;
- numPoints++;
- }
- /*
- * Now that we've located the extreme points, loop through them all
- * to see which are inside the rectangle.
- */
- inside = (points[0] > tRect[0]) && (points[0] < tRect[2])
- && (points[1] > tRect[1]) && (points[1] < tRect[3]);
- for (pointPtr = points+2; numPoints > 1; pointPtr += 2, numPoints--) {
- newInside = (pointPtr[0] > tRect[0]) && (pointPtr[0] < tRect[2])
- && (pointPtr[1] > tRect[1]) && (pointPtr[1] < tRect[3]);
- if (newInside != inside) {
- return 0;
- }
- }
- if (inside) {
- return 1;
- }
- /*
- * So far, oval appears to be outside rectangle, but can't yet tell
- * for sure. Next, test each of the four sides of the rectangle
- * against the bounding region for the arc. If any intersections
- * are found, then return "overlapping". First, test against the
- * polygon(s) forming the sides of a chord or pie-slice.
- */
- if (arcPtr->style == PIESLICE_STYLE) {
- if (width >= 1.0) {
- if (TkPolygonToArea(arcPtr->outlinePtr, PIE_OUTLINE1_PTS,
- rectPtr) != -1) {
- return 0;
- }
- if (TkPolygonToArea(arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
- PIE_OUTLINE2_PTS, rectPtr) != -1) {
- return 0;
- }
- } else {
- if ((TkLineToArea(center, arcPtr->center1, rectPtr) != -1) ||
- (TkLineToArea(center, arcPtr->center2, rectPtr) != -1)) {
- return 0;
- }
- }
- } else if (arcPtr->style == CHORD_STYLE) {
- if (width >= 1.0) {
- if (TkPolygonToArea(arcPtr->outlinePtr, CHORD_OUTLINE_PTS,
- rectPtr) != -1) {
- return 0;
- }
- } else {
- if (TkLineToArea(arcPtr->center1, arcPtr->center2,
- rectPtr) != -1) {
- return 0;
- }
- }
- }
- /*
- * Next check for overlap between each of the four sides and the
- * outer perimiter of the arc. If the arc isn't filled, then also
- * check the inner perimeter of the arc.
- */
- if (HorizLineToArc(tRect[0], tRect[2], tRect[1], rx, ry, arcPtr->start,
- arcPtr->extent)
- || HorizLineToArc(tRect[0], tRect[2], tRect[3], rx, ry,
- arcPtr->start, arcPtr->extent)
- || VertLineToArc(tRect[0], tRect[1], tRect[3], rx, ry,
- arcPtr->start, arcPtr->extent)
- || VertLineToArc(tRect[2], tRect[1], tRect[3], rx, ry,
- arcPtr->start, arcPtr->extent)) {
- return 0;
- }
- if ((width > 1.0) && !filled) {
- rx -= width;
- ry -= width;
- if (HorizLineToArc(tRect[0], tRect[2], tRect[1], rx, ry, arcPtr->start,
- arcPtr->extent)
- || HorizLineToArc(tRect[0], tRect[2], tRect[3], rx, ry,
- arcPtr->start, arcPtr->extent)
- || VertLineToArc(tRect[0], tRect[1], tRect[3], rx, ry,
- arcPtr->start, arcPtr->extent)
- || VertLineToArc(tRect[2], tRect[1], tRect[3], rx, ry,
- arcPtr->start, arcPtr->extent)) {
- return 0;
- }
- }
- /*
- * The arc still appears to be totally disjoint from the rectangle,
- * but it's also possible that the rectangle is totally inside the arc.
- * Do one last check, which is to check one point of the rectangle
- * to see if it's inside the arc. If it is, we've got overlap. If
- * it isn't, the arc's really outside the rectangle.
- */
- if (ArcToPoint(canvas, itemPtr, rectPtr) == 0.0) {
- return 0;
- }
- return -1;
- }
- /*
- *--------------------------------------------------------------
- *
- * ScaleArc --
- *
- * This procedure is invoked to rescale an arc item.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The arc 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
- ScaleArc(canvas, itemPtr, originX, originY, scaleX, scaleY)
- Tk_Canvas canvas; /* Canvas containing arc. */
- Tk_Item *itemPtr; /* Arc to be scaled. */
- double originX, originY; /* Origin about which to scale rect. */
- double scaleX; /* Amount to scale in X direction. */
- double scaleY; /* Amount to scale in Y direction. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- arcPtr->bbox[0] = originX + scaleX*(arcPtr->bbox[0] - originX);
- arcPtr->bbox[1] = originY + scaleY*(arcPtr->bbox[1] - originY);
- arcPtr->bbox[2] = originX + scaleX*(arcPtr->bbox[2] - originX);
- arcPtr->bbox[3] = originY + scaleY*(arcPtr->bbox[3] - originY);
- ComputeArcBbox(canvas, arcPtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * TranslateArc --
- *
- * This procedure is called to move an arc by a given amount.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The position of the arc is offset by (xDelta, yDelta), and
- * the bounding box is updated in the generic part of the item
- * structure.
- *
- *--------------------------------------------------------------
- */
- static void
- TranslateArc(canvas, itemPtr, deltaX, deltaY)
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item that is being moved. */
- double deltaX, deltaY; /* Amount by which item is to be
- * moved. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- arcPtr->bbox[0] += deltaX;
- arcPtr->bbox[1] += deltaY;
- arcPtr->bbox[2] += deltaX;
- arcPtr->bbox[3] += deltaY;
- ComputeArcBbox(canvas, arcPtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * ComputeArcOutline --
- *
- * This procedure creates a polygon describing everything in
- * the outline for an arc except what's in the curved part.
- * For a "pie slice" arc this is a V-shaped chunk, and for
- * a "chord" arc this is a linear chunk (with cutaway corners).
- * For "arc" arcs, this stuff isn't relevant.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The information at arcPtr->outlinePtr gets modified, and
- * storage for arcPtr->outlinePtr may be allocated or freed.
- *
- *--------------------------------------------------------------
- */
- static void
- ComputeArcOutline(canvas,arcPtr)
- Tk_Canvas canvas; /* Information about overall canvas. */
- ArcItem *arcPtr; /* Information about arc. */
- {
- double sin1, cos1, sin2, cos2, angle, width, halfWidth;
- double boxWidth, boxHeight;
- double vertex[2], corner1[2], corner2[2];
- double *outlinePtr;
- Tk_State state = arcPtr->header.state;
- /*
- * Make sure that the outlinePtr array is large enough to hold
- * either a chord or pie-slice outline.
- */
- if (arcPtr->numOutlinePoints == 0) {
- arcPtr->outlinePtr = (double *) ckalloc((unsigned)
- (26 * sizeof(double)));
- arcPtr->numOutlinePoints = 22;
- }
- outlinePtr = arcPtr->outlinePtr;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- /*
- * First compute the two points that lie at the centers of
- * the ends of the curved arc segment, which are marked with
- * X's in the figure below:
- *
- *
- * * * *
- * * *
- * * * * *
- * * * * *
- * * * * *
- * X * * X
- *
- * The code is tricky because the arc can be ovular in shape.
- * It computes the position for a unit circle, and then
- * scales to fit the shape of the arc's bounding box.
- *
- * Also, watch out because angles go counter-clockwise like you
- * might expect, but the y-coordinate system is inverted. To
- * handle this, just negate the angles in all the computations.
- */
- boxWidth = arcPtr->bbox[2] - arcPtr->bbox[0];
- boxHeight = arcPtr->bbox[3] - arcPtr->bbox[1];
- angle = -arcPtr->start*PI/180.0;
- sin1 = sin(angle);
- cos1 = cos(angle);
- angle -= arcPtr->extent*PI/180.0;
- sin2 = sin(angle);
- cos2 = cos(angle);
- vertex[0] = (arcPtr->bbox[0] + arcPtr->bbox[2])/2.0;
- vertex[1] = (arcPtr->bbox[1] + arcPtr->bbox[3])/2.0;
- arcPtr->center1[0] = vertex[0] + cos1*boxWidth/2.0;
- arcPtr->center1[1] = vertex[1] + sin1*boxHeight/2.0;
- arcPtr->center2[0] = vertex[0] + cos2*boxWidth/2.0;
- arcPtr->center2[1] = vertex[1] + sin2*boxHeight/2.0;
- /*
- * Next compute the "outermost corners" of the arc, which are
- * marked with X's in the figure below:
- *
- * * * *
- * * *
- * * * * *
- * * * * *
- * X * * X
- * * *
- *
- * The code below is tricky because it has to handle eccentricity
- * in the shape of the oval. The key in the code below is to
- * realize that the slope of the line from arcPtr->center1 to corner1
- * is (boxWidth*sin1)/(boxHeight*cos1), and similarly for arcPtr->center2
- * and corner2. These formulas can be computed from the formula for
- * the oval.
- */
- width = arcPtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *) arcPtr) {
- if (arcPtr->outline.activeWidth>arcPtr->outline.width) {
- width = arcPtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (arcPtr->outline.disabledWidth>arcPtr->outline.width) {
- width = arcPtr->outline.disabledWidth;
- }
- }
- halfWidth = width/2.0;
- if (((boxWidth*sin1) == 0.0) && ((boxHeight*cos1) == 0.0)) {
- angle = 0.0;
- } else {
- angle = atan2(boxWidth*sin1, boxHeight*cos1);
- }
- corner1[0] = arcPtr->center1[0] + cos(angle)*halfWidth;
- corner1[1] = arcPtr->center1[1] + sin(angle)*halfWidth;
- if (((boxWidth*sin2) == 0.0) && ((boxHeight*cos2) == 0.0)) {
- angle = 0.0;
- } else {
- angle = atan2(boxWidth*sin2, boxHeight*cos2);
- }
- corner2[0] = arcPtr->center2[0] + cos(angle)*halfWidth;
- corner2[1] = arcPtr->center2[1] + sin(angle)*halfWidth;
- /*
- * For a chord outline, generate a six-sided polygon with three
- * points for each end of the chord. The first and third points
- * for each end are butt points generated on either side of the
- * center point. The second point is the corner point.
- */
- if (arcPtr->style == CHORD_STYLE) {
- outlinePtr[0] = outlinePtr[12] = corner1[0];
- outlinePtr[1] = outlinePtr[13] = corner1[1];
- TkGetButtPoints(arcPtr->center2, arcPtr->center1,
- width, 0, outlinePtr+10, outlinePtr+2);
- outlinePtr[4] = arcPtr->center2[0] + outlinePtr[2]
- - arcPtr->center1[0];
- outlinePtr[5] = arcPtr->center2[1] + outlinePtr[3]
- - arcPtr->center1[1];
- outlinePtr[6] = corner2[0];
- outlinePtr[7] = corner2[1];
- outlinePtr[8] = arcPtr->center2[0] + outlinePtr[10]
- - arcPtr->center1[0];
- outlinePtr[9] = arcPtr->center2[1] + outlinePtr[11]
- - arcPtr->center1[1];
- } else if (arcPtr->style == PIESLICE_STYLE) {
- /*
- * For pie slices, generate two polygons, one for each side
- * of the pie slice. The first arm has a shape like this,
- * where the center of the oval is X, arcPtr->center1 is at Y, and
- * corner1 is at Z:
- *
- * _____________________
- * |
- * |
- * X Y Z
- * | /
- * |_____________________/
- *
- */
- TkGetButtPoints(arcPtr->center1, vertex, width, 0,
- outlinePtr, outlinePtr+2);
- outlinePtr[4] = arcPtr->center1[0] + outlinePtr[2] - vertex[0];
- outlinePtr[5] = arcPtr->center1[1] + outlinePtr[3] - vertex[1];
- outlinePtr[6] = corner1[0];
- outlinePtr[7] = corner1[1];
- outlinePtr[8] = arcPtr->center1[0] + outlinePtr[0] - vertex[0];
- outlinePtr[9] = arcPtr->center1[1] + outlinePtr[1] - vertex[1];
- outlinePtr[10] = outlinePtr[0];
- outlinePtr[11] = outlinePtr[1];
- /*
- * The second arm has a shape like this:
- *
- *
- * ______________________
- * /
- * /
- * Z Y X /
- * /
- * ______________________/
- *
- * Similar to above X is the center of the oval/circle, Y is
- * arcPtr->center2, and Z is corner2. The extra jog out to the left
- * of X is needed in or to produce a butted joint with the
- * first arm; the corner to the right of X is one of the
- * first two points of the first arm, depending on extent.
- */
- TkGetButtPoints(arcPtr->center2, vertex, width, 0,
- outlinePtr+12, outlinePtr+16);
- if ((arcPtr->extent > 180) ||
- ((arcPtr->extent < 0) && (arcPtr->extent > -180))) {
- outlinePtr[14] = outlinePtr[0];
- outlinePtr[15] = outlinePtr[1];
- } else {
- outlinePtr[14] = outlinePtr[2];
- outlinePtr[15] = outlinePtr[3];
- }
- outlinePtr[18] = arcPtr->center2[0] + outlinePtr[16] - vertex[0];
- outlinePtr[19] = arcPtr->center2[1] + outlinePtr[17] - vertex[1];
- outlinePtr[20] = corner2[0];
- outlinePtr[21] = corner2[1];
- outlinePtr[22] = arcPtr->center2[0] + outlinePtr[12] - vertex[0];
- outlinePtr[23] = arcPtr->center2[1] + outlinePtr[13] - vertex[1];
- outlinePtr[24] = outlinePtr[12];
- outlinePtr[25] = outlinePtr[13];
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * HorizLineToArc --
- *
- * Determines whether a horizontal line segment intersects
- * a given arc.
- *
- * Results:
- * The return value is 1 if the given line intersects the
- * infinitely-thin arc section defined by rx, ry, start,
- * and extent, and 0 otherwise. Only the perimeter of the
- * arc is checked: interior areas (e.g. pie-slice or chord)
- * are not checked.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- HorizLineToArc(x1, x2, y, rx, ry, start, extent)
- double x1, x2; /* X-coords of endpoints of line segment.
- * X1 must be <= x2. */
- double y; /* Y-coordinate of line segment. */
- double rx, ry; /* These x- and y-radii define an oval
- * centered at the origin. */
- double start, extent; /* Angles that define extent of arc, in
- * the standard fashion for this module. */
- {
- double tmp;
- double tx, ty; /* Coordinates of intersection point in
- * transformed coordinate system. */
- double x;
- /*
- * Compute the x-coordinate of one possible intersection point
- * between the arc and the line. Use a transformed coordinate
- * system where the oval is a unit circle centered at the origin.
- * Then scale back to get actual x-coordinate.
- */
- ty = y/ry;
- tmp = 1 - ty*ty;
- if (tmp < 0) {
- return 0;
- }
- tx = sqrt(tmp);
- x = tx*rx;
- /*
- * Test both intersection points.
- */
- if ((x >= x1) && (x <= x2) && AngleInRange(tx, ty, start, extent)) {
- return 1;
- }
- if ((-x >= x1) && (-x <= x2) && AngleInRange(-tx, ty, start, extent)) {
- return 1;
- }
- return 0;
- }
- /*
- *--------------------------------------------------------------
- *
- * VertLineToArc --
- *
- * Determines whether a vertical line segment intersects
- * a given arc.
- *
- * Results:
- * The return value is 1 if the given line intersects the
- * infinitely-thin arc section defined by rx, ry, start,
- * and extent, and 0 otherwise. Only the perimeter of the
- * arc is checked: interior areas (e.g. pie-slice or chord)
- * are not checked.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- VertLineToArc(x, y1, y2, rx, ry, start, extent)
- double x; /* X-coordinate of line segment. */
- double y1, y2; /* Y-coords of endpoints of line segment.
- * Y1 must be <= y2. */
- double rx, ry; /* These x- and y-radii define an oval
- * centered at the origin. */
- double start, extent; /* Angles that define extent of arc, in
- * the standard fashion for this module. */
- {
- double tmp;
- double tx, ty; /* Coordinates of intersection point in
- * transformed coordinate system. */
- double y;
- /*
- * Compute the y-coordinate of one possible intersection point
- * between the arc and the line. Use a transformed coordinate
- * system where the oval is a unit circle centered at the origin.
- * Then scale back to get actual y-coordinate.
- */
- tx = x/rx;
- tmp = 1 - tx*tx;
- if (tmp < 0) {
- return 0;
- }
- ty = sqrt(tmp);
- y = ty*ry;
- /*
- * Test both intersection points.
- */
- if ((y > y1) && (y < y2) && AngleInRange(tx, ty, start, extent)) {
- return 1;
- }
- if ((-y > y1) && (-y < y2) && AngleInRange(tx, -ty, start, extent)) {
- return 1;
- }
- return 0;
- }
- /*
- *--------------------------------------------------------------
- *
- * AngleInRange --
- *
- * Determine whether the angle from the origin to a given
- * point is within a given range.
- *
- * Results:
- * The return value is 1 if the angle from (0,0) to (x,y)
- * is in the range given by start and extent, where angles
- * are interpreted in the standard way for ovals (meaning
- * backwards from normal interpretation). Otherwise the
- * return value is 0.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- AngleInRange(x, y, start, extent)
- double x, y; /* Coordinate of point; angle measured
- * from origin to here, relative to x-axis. */
- double start; /* First angle, degrees, >=0, <=360. */
- double extent; /* Size of arc in degrees >=-360, <=360. */
- {
- double diff;
- if ((x == 0.0) && (y == 0.0)) {
- return 1;
- }
- diff = -atan2(y, x);
- diff = diff*(180.0/PI) - start;
- while (diff > 360.0) {
- diff -= 360.0;
- }
- while (diff < 0.0) {
- diff += 360.0;
- }
- if (extent >= 0) {
- return diff <= extent;
- }
- return (diff-360.0) >= extent;
- }
- /*
- *--------------------------------------------------------------
- *
- * ArcToPostscript --
- *
- * This procedure is called to generate Postscript for
- * arc 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
- ArcToPostscript(interp, canvas, itemPtr, prepass)
- Tcl_Interp *interp; /* Leave Postscript or error message
- * here. */
- Tk_Canvas canvas; /* Information about overall canvas. */
- Tk_Item *itemPtr; /* Item for which Postscript is
- * wanted. */
- int prepass; /* 1 means this is a prepass to
- * collect font information; 0 means
- * final Postscript is being created. */
- {
- ArcItem *arcPtr = (ArcItem *) itemPtr;
- char buffer[400];
- double y1, y2, ang1, ang2;
- XColor *color;
- Pixmap stipple;
- XColor *fillColor;
- Pixmap fillStipple;
- Tk_State state = itemPtr->state;
- y1 = Tk_CanvasPsY(canvas, arcPtr->bbox[1]);
- y2 = Tk_CanvasPsY(canvas, arcPtr->bbox[3]);
- ang1 = arcPtr->start;
- ang2 = ang1 + arcPtr->extent;
- if (ang2 < ang1) {
- ang1 = ang2;
- ang2 = arcPtr->start;
- }
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- color = arcPtr->outline.color;
- stipple = arcPtr->outline.stipple;
- fillColor = arcPtr->fillColor;
- fillStipple = arcPtr->fillStipple;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (arcPtr->outline.activeColor!=NULL) {
- color = arcPtr->outline.activeColor;
- }
- if (arcPtr->outline.activeStipple!=None) {
- stipple = arcPtr->outline.activeStipple;
- }
- if (arcPtr->activeFillColor!=NULL) {
- fillColor = arcPtr->activeFillColor;
- }
- if (arcPtr->activeFillStipple!=None) {
- fillStipple = arcPtr->activeFillStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (arcPtr->outline.disabledColor!=NULL) {
- color = arcPtr->outline.disabledColor;
- }
- if (arcPtr->outline.disabledStipple!=None) {
- stipple = arcPtr->outline.disabledStipple;
- }
- if (arcPtr->disabledFillColor!=NULL) {
- fillColor = arcPtr->disabledFillColor;
- }
- if (arcPtr->disabledFillStipple!=None) {
- fillStipple = arcPtr->disabledFillStipple;
- }
- }
- /*
- * If the arc is filled, output Postscript for the interior region
- * of the arc.
- */
- if (arcPtr->fillGC != None) {
- sprintf(buffer, "matrix currentmatrixn%.15g %.15g translate %.15g %.15g scalen",
- (arcPtr->bbox[0] + arcPtr->bbox[2])/2, (y1 + y2)/2,
- (arcPtr->bbox[2] - arcPtr->bbox[0])/2, (y1 - y2)/2);
- Tcl_AppendResult(interp, buffer, (char *) NULL);
- if (arcPtr->style == CHORD_STYLE) {
- sprintf(buffer, "0 0 1 %.15g %.15g arc closepathnsetmatrixn",
- ang1, ang2);
- } else {
- sprintf(buffer,
- "0 0 moveto 0 0 1 %.15g %.15g arc closepathnsetmatrixn",
- ang1, ang2);
- }
- Tcl_AppendResult(interp, buffer, (char *) NULL);
- if (Tk_CanvasPsColor(interp, canvas, fillColor) != TCL_OK) {
- return TCL_ERROR;
- };
- if (fillStipple != None) {
- Tcl_AppendResult(interp, "clip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas, fillStipple)
- != TCL_OK) {
- return TCL_ERROR;
- }
- if (arcPtr->outline.gc != None) {
- Tcl_AppendResult(interp, "grestore gsaven", (char *) NULL);
- }
- } else {
- Tcl_AppendResult(interp, "filln", (char *) NULL);
- }
- }
- /*
- * If there's an outline for the arc, draw it.
- */
- if (arcPtr->outline.gc != None) {
- sprintf(buffer, "matrix currentmatrixn%.15g %.15g translate %.15g %.15g scalen",
- (arcPtr->bbox[0] + arcPtr->bbox[2])/2, (y1 + y2)/2,
- (arcPtr->bbox[2] - arcPtr->bbox[0])/2, (y1 - y2)/2);
- Tcl_AppendResult(interp, buffer, (char *) NULL);
- sprintf(buffer, "0 0 1 %.15g %.15g", ang1, ang2);
- Tcl_AppendResult(interp, buffer,
- " arcnsetmatrixn0 setlinecapn", (char *) NULL);
- if (Tk_CanvasPsOutline(canvas, itemPtr,
- &(arcPtr->outline)) != TCL_OK) {
- return TCL_ERROR;
- }
- if (arcPtr->style != ARC_STYLE) {
- Tcl_AppendResult(interp, "grestore gsaven", (char *) NULL);
- if (arcPtr->style == CHORD_STYLE) {
- Tk_CanvasPsPath(interp, canvas, arcPtr->outlinePtr,
- CHORD_OUTLINE_PTS);
- } else {
- Tk_CanvasPsPath(interp, canvas, arcPtr->outlinePtr,
- PIE_OUTLINE1_PTS);
- if (Tk_CanvasPsColor(interp, canvas, color)
- != TCL_OK) {
- return TCL_ERROR;
- }
- if (stipple != None) {
- Tcl_AppendResult(interp, "clip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas,
- stipple) != TCL_OK) {
- return TCL_ERROR;
- }
- } else {
- Tcl_AppendResult(interp, "filln", (char *) NULL);
- }
- Tcl_AppendResult(interp, "grestore gsaven", (char *) NULL);
- Tk_CanvasPsPath(interp, canvas,
- arcPtr->outlinePtr + 2*PIE_OUTLINE1_PTS,
- PIE_OUTLINE2_PTS);
- }
- if (Tk_CanvasPsColor(interp, canvas, color)
- != TCL_OK) {
- return TCL_ERROR;
- }
- if (stipple != None) {
- Tcl_AppendResult(interp, "clip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas,
- stipple) != TCL_OK) {
- return TCL_ERROR;
- }
- } else {
- Tcl_AppendResult(interp, "filln", (char *) NULL);
- }
- }
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * StyleParseProc --
- *
- * This procedure is invoked during option processing to handle
- * the "-style" option.
- *
- * Results:
- * A standard Tcl return value.
- *
- * Side effects:
- * The state for a given item gets replaced by the state
- * indicated in the value argument.
- *
- *--------------------------------------------------------------
- */
- static int
- StyleParseProc(clientData, interp, tkwin, value, widgRec, offset)
- ClientData clientData; /* some flags.*/
- Tcl_Interp *interp; /* Used for reporting errors. */
- Tk_Window tkwin; /* Window containing canvas widget. */
- CONST char *value; /* Value of option. */
- char *widgRec; /* Pointer to record for item. */
- int offset; /* Offset into item. */
- {
- int c;
- size_t length;
- register Style *stylePtr = (Style *) (widgRec + offset);
- if(value == NULL || *value == 0) {
- *stylePtr = PIESLICE_STYLE;
- return TCL_OK;
- }
- c = value[0];
- length = strlen(value);
- if ((c == 'a') && (strncmp(value, "arc", length) == 0)) {
- *stylePtr = ARC_STYLE;
- return TCL_OK;
- }
- if ((c == 'c') && (strncmp(value, "chord", length) == 0)) {
- *stylePtr = CHORD_STYLE;
- return TCL_OK;
- }
- if ((c == 'p') && (strncmp(value, "pieslice", length) == 0)) {
- *stylePtr = PIESLICE_STYLE;
- return TCL_OK;
- }
- Tcl_AppendResult(interp, "bad -style option "",
- value, "": must be arc, chord, or pieslice",
- (char *) NULL);
- *stylePtr = PIESLICE_STYLE;
- return TCL_ERROR;
- }
- /*
- *--------------------------------------------------------------
- *
- * StylePrintProc --
- *
- * This procedure is invoked by the Tk configuration code
- * to produce a printable string for the "-style"
- * configuration option.
- *
- * Results:
- * The return value is a string describing the state for
- * the item referred to by "widgRec". In addition, *freeProcPtr
- * is filled in with the address of a procedure to call to free
- * the result string when it's no longer needed (or NULL to
- * indicate that the string doesn't need to be freed).
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static char *
- StylePrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
- ClientData clientData; /* Ignored. */
- Tk_Window tkwin; /* Ignored. */
- char *widgRec; /* Pointer to record for item. */
- int offset; /* Offset into item. */
- Tcl_FreeProc **freeProcPtr; /* Pointer to variable to fill in with
- * information about how to reclaim
- * storage for return string. */
- {
- register Style *stylePtr = (Style *) (widgRec + offset);
- if (*stylePtr==ARC_STYLE) {
- return "arc";
- } else if (*stylePtr==CHORD_STYLE) {
- return "chord";
- } else {
- return "pieslice";
- }
- }