Initial revision

1 files changed, 1030 insertions, 0 deletions

diff --git a/generic/tkRectOval.c b/generic/tkRectOval.c
new file mode 100644
index 0000000..d1ba71c
--- /dev/null
+++ b/generic/tkRectOval.c
@@ -0,0 +1,1030 @@
+/* 
+ * tkRectOval.c --
+ *
+ *	This file implements rectangle and oval items for canvas
+ *	widgets.
+ *
+ * Copyright (c) 1991-1994 The Regents of the University of California.
+ * Copyright (c) 1994-1996 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tkRectOval.c 1.40 96/05/03 10:52:21
+ */
+
+#include <stdio.h>
+#include "tk.h"
+#include "tkInt.h"
+#include "tkPort.h"
+
+/*
+ * The structure below defines the record for each rectangle/oval item.
+ */
+
+typedef struct RectOvalItem  {
+    Tk_Item header;		/* Generic stuff that's the same for all
+				 * types.  MUST BE FIRST IN STRUCTURE. */
+    double bbox[4];		/* Coordinates of bounding box for rectangle
+				 * or oval (x1, y1, x2, y2).  Item includes
+				 * x1 and x2 but not y1 and y2. */
+    int width;			/* Width of outline. */
+    XColor *outlineColor;	/* Color for outline. */
+    XColor *fillColor;		/* Color for filling rectangle/oval. */
+    Pixmap fillStipple;		/* Stipple bitmap for filling item. */
+    GC outlineGC;		/* Graphics context for outline. */
+    GC fillGC;			/* Graphics context for filling item. */
+} RectOvalItem;
+
+/*
+ * Information used for parsing configuration specs:
+ */
+
+static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
+    Tk_CanvasTagsPrintProc, (ClientData) NULL
+};
+
+static Tk_ConfigSpec configSpecs[] = {
+    {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
+	(char *) NULL, Tk_Offset(RectOvalItem, fillColor), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
+	"black", Tk_Offset(RectOvalItem, outlineColor), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
+	(char *) NULL, Tk_Offset(RectOvalItem, fillStipple), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
+	(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
+    {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
+	"1", Tk_Offset(RectOvalItem, width), TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
+	(char *) NULL, 0, 0}
+};
+
+/*
+ * Prototypes for procedures defined in this file:
+ */
+
+static void		ComputeRectOvalBbox _ANSI_ARGS_((Tk_Canvas canvas,
+			    RectOvalItem *rectOvalPtr));
+static int		ConfigureRectOval _ANSI_ARGS_((Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
+			    char **argv, int flags));
+static int		CreateRectOval _ANSI_ARGS_((Tcl_Interp *interp,
+			    Tk_Canvas canvas, struct Tk_Item *itemPtr,
+			    int argc, char **argv));
+static void		DeleteRectOval _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, Display *display));
+static void		DisplayRectOval _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, Display *display, Drawable dst,
+			    int x, int y, int width, int height));
+static int		OvalToArea _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double *areaPtr));
+static double		OvalToPoint _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double *pointPtr));
+static int		RectOvalCoords _ANSI_ARGS_((Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
+			    char **argv));
+static int		RectOvalToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
+static int		RectToArea _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double *areaPtr));
+static double		RectToPoint _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double *pointPtr));
+static void		ScaleRectOval _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double originX, double originY,
+			    double scaleX, double scaleY));
+static void		TranslateRectOval _ANSI_ARGS_((Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double deltaX, double deltaY));
+
+/*
+ * The structures below defines the rectangle and oval item types
+ * by means of procedures that can be invoked by generic item code.
+ */
+
+Tk_ItemType tkRectangleType = {
+    "rectangle",			/* name */
+    sizeof(RectOvalItem),		/* itemSize */
+    CreateRectOval,			/* createProc */
+    configSpecs,			/* configSpecs */
+    ConfigureRectOval,			/* configureProc */
+    RectOvalCoords,			/* coordProc */
+    DeleteRectOval,			/* deleteProc */
+    DisplayRectOval,			/* displayProc */
+    0,					/* alwaysRedraw */
+    RectToPoint,			/* pointProc */
+    RectToArea,				/* areaProc */
+    RectOvalToPostscript,		/* postscriptProc */
+    ScaleRectOval,			/* scaleProc */
+    TranslateRectOval,			/* 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 */
+};
+
+Tk_ItemType tkOvalType = {
+    "oval",				/* name */
+    sizeof(RectOvalItem),		/* itemSize */
+    CreateRectOval,			/* createProc */
+    configSpecs,			/* configSpecs */
+    ConfigureRectOval,			/* configureProc */
+    RectOvalCoords,			/* coordProc */
+    DeleteRectOval,			/* deleteProc */
+    DisplayRectOval,			/* displayProc */
+    0,					/* alwaysRedraw */
+    OvalToPoint,			/* pointProc */
+    OvalToArea,				/* areaProc */
+    RectOvalToPostscript,		/* postscriptProc */
+    ScaleRectOval,			/* scaleProc */
+    TranslateRectOval,			/* translateProc */
+    (Tk_ItemIndexProc *) NULL,		/* indexProc */
+    (Tk_ItemCursorProc *) NULL,		/* cursorProc */
+    (Tk_ItemSelectionProc *) NULL,	/* selectionProc */
+    (Tk_ItemInsertProc *) NULL,		/* insertProc */
+    (Tk_ItemDCharsProc *) NULL,		/* dTextProc */
+    (Tk_ItemType *) NULL		/* nextPtr */
+};
+
+/*
+ *--------------------------------------------------------------
+ *
+ * CreateRectOval --
+ *
+ *	This procedure is invoked to create a new rectangle
+ *	or oval 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
+ *	interp->result;  in this case itemPtr is left uninitialized,
+ *	so it can be safely freed by the caller.
+ *
+ * Side effects:
+ *	A new rectangle or oval item is created.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+CreateRectOval(interp, canvas, itemPtr, argc, argv)
+    Tcl_Interp *interp;			/* 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 argc;				/* Number of arguments in argv. */
+    char **argv;			/* Arguments describing rectangle. */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+
+    if (argc < 4) {
+	Tcl_AppendResult(interp, "wrong # args: should be \"",
+		Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
+		itemPtr->typePtr->name, " x1 y1 x2 y2 ?options?\"",
+		(char *) NULL);
+	return TCL_ERROR;
+    }
+
+    /*
+     * Carry out initialization that is needed in order to clean
+     * up after errors during the the remainder of this procedure.
+     */
+
+    rectOvalPtr->width = 1;
+    rectOvalPtr->outlineColor = NULL;
+    rectOvalPtr->fillColor = NULL;
+    rectOvalPtr->fillStipple = None;
+    rectOvalPtr->outlineGC = None;
+    rectOvalPtr->fillGC = None;
+
+    /*
+     * Process the arguments to fill in the item record.
+     */
+
+    if ((Tk_CanvasGetCoord(interp, canvas, argv[0],
+		&rectOvalPtr->bbox[0]) != TCL_OK)
+	    || (Tk_CanvasGetCoord(interp, canvas, argv[1],
+		&rectOvalPtr->bbox[1]) != TCL_OK)
+	    || (Tk_CanvasGetCoord(interp, canvas, argv[2],
+		    &rectOvalPtr->bbox[2]) != TCL_OK)
+	    || (Tk_CanvasGetCoord(interp, canvas, argv[3],
+		    &rectOvalPtr->bbox[3]) != TCL_OK)) {
+	return TCL_ERROR;
+    }
+
+    if (ConfigureRectOval(interp, canvas, itemPtr, argc-4, argv+4, 0)
+	    != TCL_OK) {
+	DeleteRectOval(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
+	return TCL_ERROR;
+    }
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * RectOvalCoords --
+ *
+ *	This procedure is invoked to process the "coords" widget
+ *	command on rectangles and ovals.  See the user documentation
+ *	for details on what it does.
+ *
+ * Results:
+ *	Returns TCL_OK or TCL_ERROR, and sets interp->result.
+ *
+ * Side effects:
+ *	The coordinates for the given item may be changed.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+RectOvalCoords(interp, canvas, itemPtr, argc, argv)
+    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 argc;				/* Number of coordinates supplied in
+					 * argv. */
+    char **argv;			/* Array of coordinates: x1, y1,
+					 * x2, y2, ... */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+    char c0[TCL_DOUBLE_SPACE], c1[TCL_DOUBLE_SPACE];
+    char c2[TCL_DOUBLE_SPACE], c3[TCL_DOUBLE_SPACE];
+
+    if (argc == 0) {
+	Tcl_PrintDouble(interp, rectOvalPtr->bbox[0], c0);
+	Tcl_PrintDouble(interp, rectOvalPtr->bbox[1], c1);
+	Tcl_PrintDouble(interp, rectOvalPtr->bbox[2], c2);
+	Tcl_PrintDouble(interp, rectOvalPtr->bbox[3], c3);
+	Tcl_AppendResult(interp, c0, " ", c1, " ", c2, " ", c3,
+		(char *) NULL);
+    } else if (argc == 4) {
+	if ((Tk_CanvasGetCoord(interp, canvas, argv[0],
+		    &rectOvalPtr->bbox[0]) != TCL_OK)
+		|| (Tk_CanvasGetCoord(interp, canvas, argv[1],
+		    &rectOvalPtr->bbox[1]) != TCL_OK)
+		|| (Tk_CanvasGetCoord(interp, canvas, argv[2],
+			&rectOvalPtr->bbox[2]) != TCL_OK)
+		|| (Tk_CanvasGetCoord(interp, canvas, argv[3],
+			&rectOvalPtr->bbox[3]) != TCL_OK)) {
+	    return TCL_ERROR;
+	}
+	ComputeRectOvalBbox(canvas, rectOvalPtr);
+    } else {
+	sprintf(interp->result,
+		"wrong # coordinates: expected 0 or 4, got %d",
+		argc);
+	return TCL_ERROR;
+    }
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ConfigureRectOval --
+ *
+ *	This procedure is invoked to configure various aspects
+ *	of a rectangle or oval item, such as its border and
+ *	background colors.
+ *
+ * Results:
+ *	A standard Tcl result code.  If an error occurs, then
+ *	an error message is left in interp->result.
+ *
+ * Side effects:
+ *	Configuration information, such as colors and stipple
+ *	patterns, may be set for itemPtr.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+ConfigureRectOval(interp, canvas, itemPtr, argc, argv, flags)
+    Tcl_Interp *interp;		/* Used for error reporting. */
+    Tk_Canvas canvas;		/* Canvas containing itemPtr. */
+    Tk_Item *itemPtr;		/* Rectangle item to reconfigure. */
+    int argc;			/* Number of elements in argv.  */
+    char **argv;		/* Arguments describing things to configure. */
+    int flags;			/* Flags to pass to Tk_ConfigureWidget. */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+    XGCValues gcValues;
+    GC newGC;
+    unsigned long mask;
+    Tk_Window tkwin;
+
+    tkwin = Tk_CanvasTkwin(canvas);
+    if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv,
+	    (char *) rectOvalPtr, flags) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    /*
+     * A few of the options require additional processing, such as
+     * graphics contexts.
+     */
+
+    if (rectOvalPtr->width < 1) {
+	rectOvalPtr->width = 1;
+    }
+    if (rectOvalPtr->outlineColor == NULL) {
+	newGC = None;
+    } else {
+	gcValues.foreground = rectOvalPtr->outlineColor->pixel;
+	gcValues.cap_style = CapProjecting;
+	gcValues.line_width = rectOvalPtr->width;
+	mask = GCForeground|GCCapStyle|GCLineWidth;
+	newGC = Tk_GetGC(tkwin, mask, &gcValues);
+    }
+    if (rectOvalPtr->outlineGC != None) {
+	Tk_FreeGC(Tk_Display(tkwin), rectOvalPtr->outlineGC);
+    }
+    rectOvalPtr->outlineGC = newGC;
+
+    if (rectOvalPtr->fillColor == NULL) {
+	newGC = None;
+    } else {
+	gcValues.foreground = rectOvalPtr->fillColor->pixel;
+	if (rectOvalPtr->fillStipple != None) {
+	    gcValues.stipple = rectOvalPtr->fillStipple;
+	    gcValues.fill_style = FillStippled;
+	    mask = GCForeground|GCStipple|GCFillStyle;
+	} else {
+	    mask = GCForeground;
+	}
+	newGC = Tk_GetGC(tkwin, mask, &gcValues);
+    }
+    if (rectOvalPtr->fillGC != None) {
+	Tk_FreeGC(Tk_Display(tkwin), rectOvalPtr->fillGC);
+    }
+    rectOvalPtr->fillGC = newGC;
+    ComputeRectOvalBbox(canvas, rectOvalPtr);
+
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * DeleteRectOval --
+ *
+ *	This procedure is called to clean up the data structure
+ *	associated with a rectangle or oval item.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Resources associated with itemPtr are released.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+DeleteRectOval(canvas, itemPtr, display)
+    Tk_Canvas canvas;			/* Info about overall widget. */
+    Tk_Item *itemPtr;			/* Item that is being deleted. */
+    Display *display;			/* Display containing window for
+					 * canvas. */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+
+    if (rectOvalPtr->outlineColor != NULL) {
+	Tk_FreeColor(rectOvalPtr->outlineColor);
+    }
+    if (rectOvalPtr->fillColor != NULL) {
+	Tk_FreeColor(rectOvalPtr->fillColor);
+    }
+    if (rectOvalPtr->fillStipple != None) {
+	Tk_FreeBitmap(display, rectOvalPtr->fillStipple);
+    }
+    if (rectOvalPtr->outlineGC != None) {
+	Tk_FreeGC(display, rectOvalPtr->outlineGC);
+    }
+    if (rectOvalPtr->fillGC != None) {
+	Tk_FreeGC(display, rectOvalPtr->fillGC);
+    }
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ComputeRectOvalBbox --
+ *
+ *	This procedure is invoked to compute the bounding box of
+ *	all the pixels that may be drawn as part of a rectangle
+ *	or oval.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The fields x1, y1, x2, and y2 are updated in the header
+ *	for itemPtr.
+ *
+ *--------------------------------------------------------------
+ */
+
+	/* ARGSUSED */
+static void
+ComputeRectOvalBbox(canvas, rectOvalPtr)
+    Tk_Canvas canvas;			/* Canvas that contains item. */
+    RectOvalItem *rectOvalPtr;		/* Item whose bbox is to be
+					 * recomputed. */
+{
+    int bloat, tmp;
+    double dtmp;
+
+    /*
+     * Make sure that the first coordinates are the lowest ones.
+     */
+
+    if (rectOvalPtr->bbox[1] > rectOvalPtr->bbox[3]) {
+	double tmp;
+	tmp = rectOvalPtr->bbox[3];
+	rectOvalPtr->bbox[3] = rectOvalPtr->bbox[1];
+	rectOvalPtr->bbox[1] = tmp;
+    }
+    if (rectOvalPtr->bbox[0] > rectOvalPtr->bbox[2]) {
+	double tmp;
+	tmp = rectOvalPtr->bbox[2];
+	rectOvalPtr->bbox[2] = rectOvalPtr->bbox[0];
+	rectOvalPtr->bbox[0] = tmp;
+    }
+
+    if (rectOvalPtr->outlineColor == NULL) {
+	bloat = 0;
+    } else {
+	bloat = (rectOvalPtr->width+1)/2;
+    }
+
+    /*
+     * Special note:  the rectangle is always drawn at least 1x1 in
+     * size, so round up the upper coordinates to be at least 1 unit
+     * greater than the lower ones.
+     */
+
+    tmp = (int) ((rectOvalPtr->bbox[0] >= 0) ? rectOvalPtr->bbox[0] + .5
+	    : rectOvalPtr->bbox[0] - .5);
+    rectOvalPtr->header.x1 = tmp - bloat;
+    tmp = (int) ((rectOvalPtr->bbox[1] >= 0) ? rectOvalPtr->bbox[1] + .5
+	    : rectOvalPtr->bbox[1] - .5);
+    rectOvalPtr->header.y1 = tmp - bloat;
+    dtmp = rectOvalPtr->bbox[2];
+    if (dtmp < (rectOvalPtr->bbox[0] + 1)) {
+	dtmp = rectOvalPtr->bbox[0] + 1;
+    }
+    tmp = (int) ((dtmp >= 0) ? dtmp + .5 : dtmp - .5);
+    rectOvalPtr->header.x2 = tmp + bloat;
+    dtmp = rectOvalPtr->bbox[3];
+    if (dtmp < (rectOvalPtr->bbox[1] + 1)) {
+	dtmp = rectOvalPtr->bbox[1] + 1;
+    }
+    tmp = (int) ((dtmp >= 0) ? dtmp + .5 : dtmp - .5);
+    rectOvalPtr->header.y2 = tmp + bloat;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * DisplayRectOval --
+ *
+ *	This procedure is invoked to draw a rectangle or oval
+ *	item in a given drawable.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	ItemPtr is drawn in drawable using the transformation
+ *	information in canvas.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+DisplayRectOval(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). */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+    short x1, y1, x2, y2;
+
+    /*
+     * Compute the screen coordinates of the bounding box for the item.
+     * Make sure that the bbox is at least one pixel large, since some
+     * X servers will die if it isn't.
+     */
+
+    Tk_CanvasDrawableCoords(canvas, rectOvalPtr->bbox[0], rectOvalPtr->bbox[1],
+	    &x1, &y1);
+    Tk_CanvasDrawableCoords(canvas, rectOvalPtr->bbox[2], rectOvalPtr->bbox[3],
+	    &x2, &y2);
+    if (x2 <= x1) {
+	x2 = x1+1;
+    }
+    if (y2 <= y1) {
+	y2 = y1+1;
+    }
+
+    /*
+     * Display filled part first (if wanted), then outline.  If we're
+     * stippling, then modify the stipple offset in the GC.  Be sure to
+     * reset the offset when done, since the GC is supposed to be
+     * read-only.
+     */
+
+    if (rectOvalPtr->fillGC != None) {
+	if (rectOvalPtr->fillStipple != None) {
+	    Tk_CanvasSetStippleOrigin(canvas, rectOvalPtr->fillGC);
+	}
+	if (rectOvalPtr->header.typePtr == &tkRectangleType) {
+	    XFillRectangle(display, drawable, rectOvalPtr->fillGC,
+		    x1, y1, (unsigned int) (x2-x1), (unsigned int) (y2-y1));
+	} else {
+	    XFillArc(display, drawable, rectOvalPtr->fillGC,
+		    x1, y1, (unsigned) (x2-x1), (unsigned) (y2-y1),
+		    0, 360*64);
+	}
+	if (rectOvalPtr->fillStipple != None) {
+	    XSetTSOrigin(display, rectOvalPtr->fillGC, 0, 0);
+	}
+    }
+    if (rectOvalPtr->outlineGC != None) {
+	if (rectOvalPtr->header.typePtr == &tkRectangleType) {
+	    XDrawRectangle(display, drawable, rectOvalPtr->outlineGC,
+		    x1, y1, (unsigned) (x2-x1), (unsigned) (y2-y1));
+	} else {
+	    XDrawArc(display, drawable, rectOvalPtr->outlineGC,
+		    x1, y1, (unsigned) (x2-x1), (unsigned) (y2-y1), 0, 360*64);
+	}
+    }
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * RectToPoint --
+ *
+ *	Computes the distance from a given point to a given
+ *	rectangle, 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 rectangle.  If the
+ *	point isn't inside the rectangle then the return value is the
+ *	distance from the point to the rectangle.  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
+RectToPoint(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. */
+{
+    RectOvalItem *rectPtr = (RectOvalItem *) itemPtr;
+    double xDiff, yDiff, x1, y1, x2, y2, inc, tmp;
+
+    /*
+     * Generate a new larger rectangle that includes the border
+     * width, if there is one.
+     */
+
+    x1 = rectPtr->bbox[0];
+    y1 = rectPtr->bbox[1];
+    x2 = rectPtr->bbox[2];
+    y2 = rectPtr->bbox[3];
+    if (rectPtr->outlineGC != None) {
+	inc = rectPtr->width/2.0;
+	x1 -= inc;
+	y1 -= inc;
+	x2 += inc;
+	y2 += inc;
+    }
+
+    /*
+     * If the point is inside the rectangle, handle specially:
+     * distance is 0 if rectangle is filled, otherwise compute
+     * distance to nearest edge of rectangle and subtract width
+     * of edge.
+     */
+
+    if ((pointPtr[0] >= x1) && (pointPtr[0] < x2)
+		&& (pointPtr[1] >= y1) && (pointPtr[1] < y2)) {
+	if ((rectPtr->fillGC != None) || (rectPtr->outlineGC == None)) {
+	    return 0.0;
+	}
+	xDiff = pointPtr[0] - x1;
+	tmp = x2 - pointPtr[0];
+	if (tmp < xDiff) {
+	    xDiff = tmp;
+	}
+	yDiff = pointPtr[1] - y1;
+	tmp = y2 - pointPtr[1];
+	if (tmp < yDiff) {
+	    yDiff = tmp;
+	}
+	if (yDiff < xDiff) {
+	    xDiff = yDiff;
+	}
+	xDiff -= rectPtr->width;
+	if (xDiff < 0.0) {
+	    return 0.0;
+	}
+	return xDiff;
+    }
+
+    /*
+     * Point is outside rectangle.
+     */
+
+    if (pointPtr[0] < x1) {
+	xDiff = x1 - pointPtr[0];
+    } else if (pointPtr[0] > x2)  {
+	xDiff = pointPtr[0] - x2;
+    } else {
+	xDiff = 0;
+    }
+
+    if (pointPtr[1] < y1) {
+	yDiff = y1 - pointPtr[1];
+    } else if (pointPtr[1] > y2)  {
+	yDiff = pointPtr[1] - y2;
+    } else {
+	yDiff = 0;
+    }
+
+    return hypot(xDiff, yDiff);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * OvalToPoint --
+ *
+ *	Computes the distance from a given point to a given
+ *	oval, 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 oval.  If the
+ *	point isn't inside the oval then the return value is the
+ *	distance from the point to the oval.  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
+OvalToPoint(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. */
+{
+    RectOvalItem *ovalPtr = (RectOvalItem *) itemPtr;
+    double width;
+    int filled;
+
+    width = ovalPtr->width;
+    filled = ovalPtr->fillGC != None;
+    if (ovalPtr->outlineGC == None) {
+	width = 0.0;
+	filled = 1;
+    }
+    return TkOvalToPoint(ovalPtr->bbox, width, filled, pointPtr);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * RectToArea --
+ *
+ *	This procedure is called to determine whether an item
+ *	lies entirely inside, entirely outside, or overlapping
+ *	a given rectangle.
+ *
+ * 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
+RectToArea(canvas, itemPtr, areaPtr)
+    Tk_Canvas canvas;		/* Canvas containing item. */
+    Tk_Item *itemPtr;		/* Item to check against rectangle. */
+    double *areaPtr;		/* Pointer to array of four coordinates
+				 * (x1, y1, x2, y2) describing rectangular
+				 * area.  */
+{
+    RectOvalItem *rectPtr = (RectOvalItem *) itemPtr;
+    double halfWidth;
+
+    halfWidth = rectPtr->width/2.0;
+    if (rectPtr->outlineGC == None) {
+	halfWidth = 0.0;
+    }
+
+    if ((areaPtr[2] <= (rectPtr->bbox[0] - halfWidth))
+	    || (areaPtr[0] >= (rectPtr->bbox[2] + halfWidth))
+	    || (areaPtr[3] <= (rectPtr->bbox[1] - halfWidth))
+	    || (areaPtr[1] >= (rectPtr->bbox[3] + halfWidth))) {
+	return -1;
+    }
+    if ((rectPtr->fillGC == None) && (rectPtr->outlineGC != None)
+	    && (areaPtr[0] >= (rectPtr->bbox[0] + halfWidth))
+	    && (areaPtr[1] >= (rectPtr->bbox[1] + halfWidth))
+	    && (areaPtr[2] <= (rectPtr->bbox[2] - halfWidth))
+	    && (areaPtr[3] <= (rectPtr->bbox[3] - halfWidth))) {
+	return -1;
+    }
+    if ((areaPtr[0] <= (rectPtr->bbox[0] - halfWidth))
+	    && (areaPtr[1] <= (rectPtr->bbox[1] - halfWidth))
+	    && (areaPtr[2] >= (rectPtr->bbox[2] + halfWidth))
+	    && (areaPtr[3] >= (rectPtr->bbox[3] + halfWidth))) {
+	return 1;
+    }
+    return 0;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * OvalToArea --
+ *
+ *	This procedure is called to determine whether an item
+ *	lies entirely inside, entirely outside, or overlapping
+ *	a given rectangular area.
+ *
+ * Results:
+ *	-1 is returned if the item is entirely outside the area
+ *	given by rectPtr, 0 if it overlaps, and 1 if it is entirely
+ *	inside the given area.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+	/* ARGSUSED */
+static int
+OvalToArea(canvas, itemPtr, areaPtr)
+    Tk_Canvas canvas;		/* Canvas containing item. */
+    Tk_Item *itemPtr;		/* Item to check against oval. */
+    double *areaPtr;		/* Pointer to array of four coordinates
+				 * (x1, y1, x2, y2) describing rectangular
+				 * area.  */
+{
+    RectOvalItem *ovalPtr = (RectOvalItem *) itemPtr;
+    double oval[4], halfWidth;
+    int result;
+
+    /*
+     * Expand the oval to include the width of the outline, if any.
+     */
+
+    halfWidth = ovalPtr->width/2.0;
+    if (ovalPtr->outlineGC == None) {
+	halfWidth = 0.0;
+    }
+    oval[0] = ovalPtr->bbox[0] - halfWidth;
+    oval[1] = ovalPtr->bbox[1] - halfWidth;
+    oval[2] = ovalPtr->bbox[2] + halfWidth;
+    oval[3] = ovalPtr->bbox[3] + halfWidth;
+
+    result = TkOvalToArea(oval, areaPtr);
+
+    /*
+     * If the rectangle appears to overlap the oval and the oval
+     * isn't filled, do one more check to see if perhaps all four
+     * of the rectangle's corners are totally inside the oval's
+     * unfilled center, in which case we should return "outside".
+     */
+
+    if ((result == 0) && (ovalPtr->outlineGC != None)
+	    && (ovalPtr->fillGC == None)) {
+	double centerX, centerY, width, height;
+	double xDelta1, yDelta1, xDelta2, yDelta2;
+
+	centerX = (ovalPtr->bbox[0] + ovalPtr->bbox[2])/2.0;
+	centerY = (ovalPtr->bbox[1] + ovalPtr->bbox[3])/2.0;
+	width = (ovalPtr->bbox[2] - ovalPtr->bbox[0])/2.0 - halfWidth;
+	height = (ovalPtr->bbox[3] - ovalPtr->bbox[1])/2.0 - halfWidth;
+	xDelta1 = (areaPtr[0] - centerX)/width;
+	xDelta1 *= xDelta1;
+	yDelta1 = (areaPtr[1] - centerY)/height;
+	yDelta1 *= yDelta1;
+	xDelta2 = (areaPtr[2] - centerX)/width;
+	xDelta2 *= xDelta2;
+	yDelta2 = (areaPtr[3] - centerY)/height;
+	yDelta2 *= yDelta2;
+	if (((xDelta1 + yDelta1) < 1.0)
+		&& ((xDelta1 + yDelta2) < 1.0)
+		&& ((xDelta2 + yDelta1) < 1.0)
+		&& ((xDelta2 + yDelta2) < 1.0)) {
+	    return -1;
+	}
+    }
+    return result;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ScaleRectOval --
+ *
+ *	This procedure is invoked to rescale a rectangle or oval
+ *	item.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The rectangle or oval 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
+ScaleRectOval(canvas, itemPtr, originX, originY, scaleX, scaleY)
+    Tk_Canvas canvas;			/* Canvas containing rectangle. */
+    Tk_Item *itemPtr;			/* Rectangle 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. */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+
+    rectOvalPtr->bbox[0] = originX + scaleX*(rectOvalPtr->bbox[0] - originX);
+    rectOvalPtr->bbox[1] = originY + scaleY*(rectOvalPtr->bbox[1] - originY);
+    rectOvalPtr->bbox[2] = originX + scaleX*(rectOvalPtr->bbox[2] - originX);
+    rectOvalPtr->bbox[3] = originY + scaleY*(rectOvalPtr->bbox[3] - originY);
+    ComputeRectOvalBbox(canvas, rectOvalPtr);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TranslateRectOval --
+ *
+ *	This procedure is called to move a rectangle or oval by a
+ *	given amount.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The position of the rectangle or oval is offset by
+ *	(xDelta, yDelta), and the bounding box is updated in the
+ *	generic part of the item structure.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+TranslateRectOval(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. */
+{
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+
+    rectOvalPtr->bbox[0] += deltaX;
+    rectOvalPtr->bbox[1] += deltaY;
+    rectOvalPtr->bbox[2] += deltaX;
+    rectOvalPtr->bbox[3] += deltaY;
+    ComputeRectOvalBbox(canvas, rectOvalPtr);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * RectOvalToPostscript --
+ *
+ *	This procedure is called to generate Postscript for
+ *	rectangle and oval items.
+ *
+ * Results:
+ *	The return value is a standard Tcl result.  If an error
+ *	occurs in generating Postscript then an error message is
+ *	left in interp->result, replacing whatever used to be there.
+ *	If no error occurs, then Postscript for the rectangle is
+ *	appended to the result.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+RectOvalToPostscript(interp, canvas, itemPtr, prepass)
+    Tcl_Interp *interp;			/* Interpreter for error reporting. */
+    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. */
+{
+    char pathCmd[500], string[100];
+    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
+    double y1, y2;
+
+    y1 = Tk_CanvasPsY(canvas, rectOvalPtr->bbox[1]);
+    y2 = Tk_CanvasPsY(canvas, rectOvalPtr->bbox[3]);
+
+    /*
+     * Generate a string that creates a path for the rectangle or oval.
+     * This is the only part of the procedure's code that is type-
+     * specific.
+     */
+
+
+    if (rectOvalPtr->header.typePtr == &tkRectangleType) {
+	sprintf(pathCmd, "%.15g %.15g moveto %.15g 0 rlineto 0 %.15g rlineto %.15g 0 rlineto closepath\n",
+		rectOvalPtr->bbox[0], y1,
+		rectOvalPtr->bbox[2]-rectOvalPtr->bbox[0], y2-y1,
+		rectOvalPtr->bbox[0]-rectOvalPtr->bbox[2]);
+    } else {
+	sprintf(pathCmd, "matrix currentmatrix\n%.15g %.15g translate %.15g %.15g scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n",
+		(rectOvalPtr->bbox[0] + rectOvalPtr->bbox[2])/2, (y1 + y2)/2,
+		(rectOvalPtr->bbox[2] - rectOvalPtr->bbox[0])/2, (y1 - y2)/2);
+    }
+
+    /*
+     * First draw the filled area of the rectangle.
+     */
+
+    if (rectOvalPtr->fillColor != NULL) {
+	Tcl_AppendResult(interp, pathCmd, (char *) NULL);
+	if (Tk_CanvasPsColor(interp, canvas, rectOvalPtr->fillColor)
+		!= TCL_OK) {
+	    return TCL_ERROR;
+	}
+	if (rectOvalPtr->fillStipple != None) {
+	    Tcl_AppendResult(interp, "clip ", (char *) NULL);
+	    if (Tk_CanvasPsStipple(interp, canvas, rectOvalPtr->fillStipple)
+		    != TCL_OK) {
+		return TCL_ERROR;
+	    }
+	    if (rectOvalPtr->outlineColor != NULL) {
+		Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL);
+	    }
+	} else {
+	    Tcl_AppendResult(interp, "fill\n", (char *) NULL);
+	}
+    }
+
+    /*
+     * Now draw the outline, if there is one.
+     */
+
+    if (rectOvalPtr->outlineColor != NULL) {
+	Tcl_AppendResult(interp, pathCmd, (char *) NULL);
+	sprintf(string, "%d setlinewidth", rectOvalPtr->width);
+	Tcl_AppendResult(interp, string,
+		" 0 setlinejoin 2 setlinecap\n", (char *) NULL);
+	if (Tk_CanvasPsColor(interp, canvas, rectOvalPtr->outlineColor)
+		!= TCL_OK) {
+	    return TCL_ERROR;
+	}
+	Tcl_AppendResult(interp, "stroke\n", (char *) NULL);
+    }
+    return TCL_OK;
+}