/
tkCanvArc.c
2089 lines (1927 loc) · 62.2 KB
/
tkCanvArc.c
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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.
*/
#include <stdio.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(ClientData clientData, Tcl_Interp *interp,
Tk_Window tkwin, CONST char *value,
char *widgRec, int offset);
static char * StylePrintProc(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", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.activeDash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_COLOR, "-activefill", NULL, NULL,
NULL, Tk_Offset(ArcItem, activeFillColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-activeoutline", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.activeColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-activeoutlinestipple", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.activeStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,
NULL, Tk_Offset(ArcItem, activeFillStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-activewidth", NULL, NULL,
"0.0", Tk_Offset(ArcItem, outline.activeWidth),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_CUSTOM, "-dash", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.dash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_PIXELS, "-dashoffset", NULL, NULL,
"0", Tk_Offset(ArcItem, outline.offset), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_CUSTOM, "-disableddash", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.disabledDash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
NULL, Tk_Offset(ArcItem, disabledFillColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-disabledoutline", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.disabledColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-disabledoutlinestipple", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.disabledStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
NULL, Tk_Offset(ArcItem, disabledFillStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-disabledwidth", NULL, NULL,
"0.0", Tk_Offset(ArcItem, outline.disabledWidth),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_DOUBLE, "-extent", NULL, NULL,
"90", Tk_Offset(ArcItem, extent), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_COLOR, "-fill", NULL, NULL,
NULL, Tk_Offset(ArcItem, fillColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-offset", NULL, NULL,
"0,0", Tk_Offset(ArcItem, tsoffset),
TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
{TK_CONFIG_COLOR, "-outline", NULL, NULL,
"black", Tk_Offset(ArcItem, outline.color), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-outlineoffset", NULL, NULL,
"0,0", Tk_Offset(ArcItem, outline.tsoffset),
TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
{TK_CONFIG_BITMAP, "-outlinestipple", NULL, NULL,
NULL, Tk_Offset(ArcItem, outline.stipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_DOUBLE, "-start", NULL, NULL,
"0", Tk_Offset(ArcItem, start), TK_CONFIG_DONT_SET_DEFAULT},
{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(ArcItem, fillStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-style", NULL, NULL,
NULL, Tk_Offset(ArcItem, style), TK_CONFIG_DONT_SET_DEFAULT,
&styleOption},
{TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
{TK_CONFIG_CUSTOM, "-width", NULL, NULL,
"1.0", Tk_Offset(ArcItem, outline.width), TK_CONFIG_DONT_SET_DEFAULT,
&pixelOption},
{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};
/*
* Prototypes for functions defined in this file:
*/
static void ComputeArcBbox(Tk_Canvas canvas, ArcItem *arcPtr);
static int ConfigureArc(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *CONST objv[], int flags);
static int CreateArc(Tcl_Interp *interp,
Tk_Canvas canvas, struct Tk_Item *itemPtr,
int objc, Tcl_Obj *CONST objv[]);
static void DeleteArc(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display);
static void DisplayArc(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display, Drawable dst,
int x, int y, int width, int height);
static int ArcCoords(Tcl_Interp *interp, Tk_Canvas canvas,
Tk_Item *itemPtr, int objc, Tcl_Obj *CONST objv[]);
static int ArcToArea(Tk_Canvas canvas,
Tk_Item *itemPtr, double *rectPtr);
static double ArcToPoint(Tk_Canvas canvas,
Tk_Item *itemPtr, double *coordPtr);
static int ArcToPostscript(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
static void ScaleArc(Tk_Canvas canvas,
Tk_Item *itemPtr, double originX, double originY,
double scaleX, double scaleY);
static void TranslateArc(Tk_Canvas canvas,
Tk_Item *itemPtr, double deltaX, double deltaY);
static int AngleInRange(double x, double y,
double start, double extent);
static void ComputeArcOutline(Tk_Canvas canvas, ArcItem *arcPtr);
static int HorizLineToArc(double x1, double x2,
double y, double rx, double ry,
double start, double extent);
static int VertLineToArc(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 functions 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 */
NULL, /* indexProc */
NULL, /* icursorProc */
NULL, /* selectionProc */
NULL, /* insertProc */
NULL, /* dTextProc */
NULL, /* nextPtr */
};
#ifndef PI
#define PI 3.14159265358979323846
#endif
/*
*--------------------------------------------------------------
*
* CreateArc --
*
* This function 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(
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) {
Tcl_Panic("canvas did not pass any coords\n");
}
/*
* Carry out initialization that is needed in order to clean up after
* errors during the the remainder of this function.
*/
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 function 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(
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 function 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(
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 function is called to clean up the data structure associated with
* an arc item.
*
* Results:
* None.
*
* Side effects:
* Resources associated with itemPtr are released.
*
*--------------------------------------------------------------
*/
static void
DeleteArc(
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 function 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(
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 = arcPtr->bbox[3];
arcPtr->bbox[3] = arcPtr->bbox[1];
arcPtr->bbox[1] = tmp;
}
if (arcPtr->bbox[0] > arcPtr->bbox[2]) {
double 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 function 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(
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, /* Describes region of canvas that must be */
int width, int height) /* 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(
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) {