shared_source/c_tk_base_7_5_w_mods/tkcanvpoly.c

/* $Header$ */

/* 
 * tkCanvPoly.c --
 *
 *      This file implements polygon items for canvas widgets.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkcanvpoly.c,v 1.1.1.1 2001/06/13 04:57:07 dtashley Exp $
 */

#include <stdio.h>
#include "tkInt.h"
#include "tkPort.h"
#include "tkCanvas.h"

/*
 * The structure below defines the record for each polygon item.
 */

typedef struct PolygonItem  {
    Tk_Item header;             /* Generic stuff that's the same for all
                                 * types.  MUST BE FIRST IN STRUCTURE. */
    Tk_Outline outline;         /* Outline structure */
    int numPoints;              /* Number of points in polygon.
                                 * Polygon is always closed. */
    int pointsAllocated;        /* Number of points for which space is
                                 * allocated at *coordPtr. */
    double *coordPtr;           /* Pointer to malloc-ed array containing
                                 * x- and y-coords of all points in polygon.
                                 * X-coords are even-valued indices, y-coords
                                 * are corresponding odd-valued indices. */
    int joinStyle;              /* Join style for outline */
    Tk_TSOffset tsoffset;
    XColor *fillColor;          /* Foreground color for polygon. */
    XColor *activeFillColor;    /* Foreground color for polygon if state is active. */
    XColor *disabledFillColor;  /* Foreground color for polygon if state is disabled. */
    Pixmap fillStipple;         /* Stipple bitmap for filling polygon. */
    Pixmap activeFillStipple;   /* Stipple bitmap for filling polygon if state is active. */
    Pixmap disabledFillStipple; /* Stipple bitmap for filling polygon if state is disabled. */
    GC fillGC;                  /* Graphics context for filling polygon. */
    Tk_SmoothMethod *smooth;    /* Non-zero means draw shape smoothed (i.e.
                                 * with Bezier splines). */
    int splineSteps;            /* Number of steps in each spline segment. */
    int autoClosed;             /* Zero means the given polygon was closed,
                                   one means that we auto closed it. */
} PolygonItem;

/*
 * Information used for parsing configuration specs:
 */

static Tk_CustomOption smoothOption = {
    (Tk_OptionParseProc *) TkSmoothParseProc,
    TkSmoothPrintProc, (ClientData) NULL
};
static Tk_CustomOption stateOption = {
    (Tk_OptionParseProc *) TkStateParseProc,
    TkStatePrintProc, (ClientData) 2
};
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|TK_OFFSET_INDEX)
};
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(PolygonItem, outline.activeDash),
        TK_CONFIG_NULL_OK, &dashOption},
    {TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, activeFillColor),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-activeoutline", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.activeColor),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-activeoutlinestipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.activeStipple),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, activeFillStipple),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-activewidth", (char *) NULL, (char *) NULL,
        "0.0", Tk_Offset(PolygonItem, outline.activeWidth),
        TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
    {TK_CONFIG_CUSTOM, "-dash", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.dash),
        TK_CONFIG_NULL_OK, &dashOption},
    {TK_CONFIG_PIXELS, "-dashoffset", (char *) NULL, (char *) NULL,
        "0", Tk_Offset(PolygonItem, outline.offset),
        TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_CUSTOM, "-disableddash", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.disabledDash),
        TK_CONFIG_NULL_OK, &dashOption},
    {TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, disabledFillColor),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-disabledoutline", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.disabledColor),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-disabledoutlinestipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.disabledStipple),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, disabledFillStipple),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-disabledwidth", (char *) NULL, (char *) NULL,
        "0.0", Tk_Offset(PolygonItem, outline.disabledWidth),
        TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
    {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
        "black", Tk_Offset(PolygonItem, fillColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_JOIN_STYLE, "-joinstyle", (char *) NULL, (char *) NULL,
        "round", Tk_Offset(PolygonItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
        "0,0", Tk_Offset(PolygonItem, tsoffset),
        TK_CONFIG_NULL_OK, &offsetOption},
    {TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.color),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-outlineoffset", (char *) NULL, (char *) NULL,
        "0,0", Tk_Offset(PolygonItem, outline.tsoffset),
        TK_CONFIG_NULL_OK, &offsetOption},
    {TK_CONFIG_BITMAP, "-outlinestipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(PolygonItem, outline.stipple),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-smooth", (char *) NULL, (char *) NULL,
        "0", Tk_Offset(PolygonItem, smooth),
        TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
    {TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL,
        "12", Tk_Offset(PolygonItem, splineSteps), 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(PolygonItem, fillStipple), TK_CONFIG_NULL_OK},
    {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(PolygonItem, 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             ComputePolygonBbox _ANSI_ARGS_((Tk_Canvas canvas,
                            PolygonItem *polyPtr));
static int              ConfigurePolygon _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                            Tcl_Obj *CONST argv[], int flags));
static int              CreatePolygon _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, struct Tk_Item *itemPtr,
                            int argc, Tcl_Obj *CONST argv[]));
static void             DeletePolygon _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr,  Display *display));
static void             DisplayPolygon _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, Display *display, Drawable dst,
                            int x, int y, int width, int height));
static int              GetPolygonIndex _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr,
                            Tcl_Obj *obj, int *indexPtr));
static int              PolygonCoords _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr,
                            int argc, Tcl_Obj *CONST argv[]));
static void             PolygonDeleteCoords _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, int first, int last));
static void             PolygonInsert _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj));
static int              PolygonToArea _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double *rectPtr));
static double           PolygonToPoint _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double *pointPtr));
static int              PolygonToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
static void             ScalePolygon _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double originX, double originY,
                            double scaleX, double scaleY));
static void             TranslatePolygon _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double deltaX, double deltaY));

/*
 * The structures below defines the polygon item type by means
 * of procedures that can be invoked by generic item code.
 */

Tk_ItemType tkPolygonType = {
    "polygon",                          /* name */
    sizeof(PolygonItem),                /* itemSize */
    CreatePolygon,                      /* createProc */
    configSpecs,                        /* configSpecs */
    ConfigurePolygon,                   /* configureProc */
    PolygonCoords,                      /* coordProc */
    DeletePolygon,                      /* deleteProc */
    DisplayPolygon,                     /* displayProc */
    TK_CONFIG_OBJS,                     /* flags */
    PolygonToPoint,                     /* pointProc */
    PolygonToArea,                      /* areaProc */
    PolygonToPostscript,                /* postscriptProc */
    ScalePolygon,                       /* scaleProc */
    TranslatePolygon,                   /* translateProc */
    (Tk_ItemIndexProc *) GetPolygonIndex,/* indexProc */
    (Tk_ItemCursorProc *) NULL,         /* icursorProc */
    (Tk_ItemSelectionProc *) NULL,      /* selectionProc */
    (Tk_ItemInsertProc *) PolygonInsert,/* insertProc */
    PolygonDeleteCoords,                /* dTextProc */
    (Tk_ItemType *) NULL,               /* nextPtr */
};

/*
 * The definition below determines how large are static arrays
 * used to hold spline points (splines larger than this have to
 * have their arrays malloc-ed).
 */

#define MAX_STATIC_POINTS 200

/*
 *--------------------------------------------------------------
 *
 * CreatePolygon --
 *
 *      This procedure is invoked to create a new polygon item in
 *      a canvas.
 *
 * Results:
 *      A standard Tcl return value.  If an error occurred in
 *      creating the item, then an error message is left in
 *      the interp's result;  in this case itemPtr is
 *      left uninitialized, so it can be safely freed by the
 *      caller.
 *
 * Side effects:
 *      A new polygon item is created.
 *
 *--------------------------------------------------------------
 */

static int
CreatePolygon(interp, canvas, itemPtr, argc, argv)
    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 argc;                           /* Number of arguments in argv. */
    Tcl_Obj *CONST argv[];              /* Arguments describing polygon. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int i;

    /*
     * Carry out initialization that is needed in order to clean
     * up after errors during the the remainder of this procedure.
     */

    Tk_CreateOutline(&(polyPtr->outline));
    polyPtr->numPoints = 0;
    polyPtr->pointsAllocated = 0;
    polyPtr->coordPtr = NULL;
    polyPtr->joinStyle = JoinRound;
    polyPtr->tsoffset.flags = 0;
    polyPtr->tsoffset.xoffset = 0;
    polyPtr->tsoffset.yoffset = 0;
    polyPtr->fillColor = NULL;
    polyPtr->activeFillColor = NULL;
    polyPtr->disabledFillColor = NULL;
    polyPtr->fillStipple = None;
    polyPtr->activeFillStipple = None;
    polyPtr->disabledFillStipple = None;
    polyPtr->fillGC = None;
    polyPtr->smooth = (Tk_SmoothMethod *) NULL;
    polyPtr->splineSteps = 12;
    polyPtr->autoClosed = 0;

    /*
     * Count the number of points and then parse them into a point
     * array.  Leading arguments are assumed to be points if they
     * start with a digit or a minus sign followed by a digit.
     */

    for (i = 0; i < argc; i++) {
        char *arg = Tcl_GetStringFromObj((Tcl_Obj *) argv[i], NULL);
        if ((arg[0] == '-') && (arg[1] >= 'a')
                && (arg[1] <= 'z')) {
            break;
        }
    }
    if (i && PolygonCoords(interp, canvas, itemPtr, i, argv) != TCL_OK) {
        goto error;
    }

    if (ConfigurePolygon(interp, canvas, itemPtr, argc-i, argv+i, 0)
            == TCL_OK) {
        return TCL_OK;
    }

    error:
    DeletePolygon(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
    return TCL_ERROR;
}

/*
 *--------------------------------------------------------------
 *
 * PolygonCoords --
 *
 *      This procedure is invoked to process the "coords" widget
 *      command on polygons.  See the user documentation for details
 *      on what it does.
 *
 * Results:
 *      Returns TCL_OK or TCL_ERROR, and sets the interp's result.
 *
 * Side effects:
 *      The coordinates for the given item may be changed.
 *
 *--------------------------------------------------------------
 */

static int
PolygonCoords(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. */
    Tcl_Obj *CONST argv[];              /* Array of coordinates: x1, y1,
                                         * x2, y2, ... */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int i, numPoints;

    if (argc == 0) {
        /*
         * Print the coords used to create the polygon.  If we auto
         * closed the polygon then we don't report the last point.
         */
        Tcl_Obj *subobj, *obj = Tcl_NewObj();
        for (i = 0; i < 2*(polyPtr->numPoints - polyPtr->autoClosed); i++) {
            subobj = Tcl_NewDoubleObj(polyPtr->coordPtr[i]);
            Tcl_ListObjAppendElement(interp, obj, subobj);
        }
        Tcl_SetObjResult(interp, obj);
        return TCL_OK;
    }
    if (argc == 1) {
        if (Tcl_ListObjGetElements(interp, argv[0], &argc,
                (Tcl_Obj ***) &argv) != TCL_OK) {
            return TCL_ERROR;
        }
    }
    if (argc & 1) {
        Tcl_AppendResult(interp,
                "odd number of coordinates specified for polygon",
                (char *) NULL);
        return TCL_ERROR;
    } else {
        numPoints = argc/2;
        if (polyPtr->pointsAllocated <= numPoints) {
            if (polyPtr->coordPtr != NULL) {
                ckfree((char *) polyPtr->coordPtr);
            }

            /*
             * One extra point gets allocated here, because we always
             * add another point to close the polygon.
             */

            polyPtr->coordPtr = (double *) ckalloc((unsigned)
                    (sizeof(double) * (argc+2)));
            polyPtr->pointsAllocated = numPoints+1;
        }
        for (i = argc-1; i >= 0; i--) {
            if (Tk_CanvasGetCoordFromObj(interp, canvas, argv[i],
                    &polyPtr->coordPtr[i]) != TCL_OK) {
                return TCL_ERROR;
            }
        }
        polyPtr->numPoints = numPoints;
        polyPtr->autoClosed = 0;

        /*
         * Close the polygon if it isn't already closed.
         */
    
        if (argc>2 && ((polyPtr->coordPtr[argc-2] != polyPtr->coordPtr[0])
                || (polyPtr->coordPtr[argc-1] != polyPtr->coordPtr[1]))) {
            polyPtr->autoClosed = 1;
            polyPtr->numPoints++;
            polyPtr->coordPtr[argc] = polyPtr->coordPtr[0];
            polyPtr->coordPtr[argc+1] = polyPtr->coordPtr[1];
        }
        ComputePolygonBbox(canvas, polyPtr);
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ConfigurePolygon --
 *
 *      This procedure is invoked to configure various aspects
 *      of a polygon item such as its background color.
 *
 * Results:
 *      A standard Tcl result code.  If an error occurs, then
 *      an error message is left in the interp's result.
 *
 * Side effects:
 *      Configuration information, such as colors and stipple
 *      patterns, may be set for itemPtr.
 *
 *--------------------------------------------------------------
 */

static int
ConfigurePolygon(interp, canvas, itemPtr, argc, argv, flags)
    Tcl_Interp *interp;         /* Interpreter for error reporting. */
    Tk_Canvas canvas;           /* Canvas containing itemPtr. */
    Tk_Item *itemPtr;           /* Polygon item to reconfigure. */
    int argc;                   /* Number of elements in argv.  */
    Tcl_Obj *CONST argv[];      /* Arguments describing things to configure. */
    int flags;                  /* Flags to pass to Tk_ConfigureWidget. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    XGCValues gcValues;
    GC newGC;
    unsigned long mask;
    Tk_Window tkwin;
    XColor *color;
    Pixmap stipple;
    Tk_State state;

    tkwin = Tk_CanvasTkwin(canvas);
    if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, (char **) argv,
            (char *) polyPtr, flags|TK_CONFIG_OBJS) != TCL_OK) {
        return TCL_ERROR;
    }

    /*
     * A few of the options require additional processing, such as
     * graphics contexts.
     */

    state = itemPtr->state;

    if (polyPtr->outline.activeWidth > polyPtr->outline.width ||
            polyPtr->outline.activeDash.number != 0 ||
            polyPtr->outline.activeColor != NULL ||
            polyPtr->outline.activeStipple != None ||
            polyPtr->activeFillColor != NULL ||
            polyPtr->activeFillStipple != None) {
        itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
    } else {
        itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
    }

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    if (state==TK_STATE_HIDDEN) {
        ComputePolygonBbox(canvas, polyPtr);
        return TCL_OK;
    }

    mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr, &(polyPtr->outline));
    if (mask) {
        gcValues.cap_style = CapRound;
        gcValues.join_style = polyPtr->joinStyle;
        mask |= GCCapStyle|GCJoinStyle;
        newGC = Tk_GetGC(tkwin, mask, &gcValues);
    } else {
        newGC = None;
    }
    if (polyPtr->outline.gc != None) {
        Tk_FreeGC(Tk_Display(tkwin), polyPtr->outline.gc);
    }
    polyPtr->outline.gc = newGC;

    color = polyPtr->fillColor;
    stipple = polyPtr->fillStipple;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (polyPtr->activeFillColor!=NULL) {
            color = polyPtr->activeFillColor;
        }
        if (polyPtr->activeFillStipple!=None) {
            stipple = polyPtr->activeFillStipple;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (polyPtr->disabledFillColor!=NULL) {
            color = polyPtr->disabledFillColor;
        }
        if (polyPtr->disabledFillStipple!=None) {
            stipple = polyPtr->disabledFillStipple;
        }
    }

    if (color == NULL) {
        newGC = None;
    } else {
        gcValues.foreground = color->pixel;
        mask = GCForeground;
        if (stipple != None) {
            gcValues.stipple = stipple;
            gcValues.fill_style = FillStippled;
            mask |= GCStipple|GCFillStyle;
        }
        newGC = Tk_GetGC(tkwin, mask, &gcValues);
    }
    if (polyPtr->fillGC != None) {
        Tk_FreeGC(Tk_Display(tkwin), polyPtr->fillGC);
    }
    polyPtr->fillGC = newGC;

    /*
     * Keep spline parameters within reasonable limits.
     */

    if (polyPtr->splineSteps < 1) {
        polyPtr->splineSteps = 1;
    } else if (polyPtr->splineSteps > 100) {
        polyPtr->splineSteps = 100;
    }

    ComputePolygonBbox(canvas, polyPtr);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * DeletePolygon --
 *
 *      This procedure is called to clean up the data structure
 *      associated with a polygon item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Resources associated with itemPtr are released.
 *
 *--------------------------------------------------------------
 */

static void
DeletePolygon(canvas, itemPtr, display)
    Tk_Canvas canvas;                   /* Info about overall canvas widget. */
    Tk_Item *itemPtr;                   /* Item that is being deleted. */
    Display *display;                   /* Display containing window for
                                         * canvas. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;

    Tk_DeleteOutline(display,&(polyPtr->outline));
    if (polyPtr->coordPtr != NULL) {
        ckfree((char *) polyPtr->coordPtr);
    }
    if (polyPtr->fillColor != NULL) {
        Tk_FreeColor(polyPtr->fillColor);
    }
    if (polyPtr->activeFillColor != NULL) {
        Tk_FreeColor(polyPtr->activeFillColor);
    }
    if (polyPtr->disabledFillColor != NULL) {
        Tk_FreeColor(polyPtr->disabledFillColor);
    }
    if (polyPtr->fillStipple != None) {
        Tk_FreeBitmap(display, polyPtr->fillStipple);
    }
    if (polyPtr->activeFillStipple != None) {
        Tk_FreeBitmap(display, polyPtr->activeFillStipple);
    }
    if (polyPtr->disabledFillStipple != None) {
        Tk_FreeBitmap(display, polyPtr->disabledFillStipple);
    }
    if (polyPtr->fillGC != None) {
        Tk_FreeGC(display, polyPtr->fillGC);
    }
}

/*
 *--------------------------------------------------------------
 *
 * ComputePolygonBbox --
 *
 *      This procedure is invoked to compute the bounding box of
 *      all the pixels that may be drawn as part of a polygon.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The fields x1, y1, x2, and y2 are updated in the header
 *      for itemPtr.
 *
 *--------------------------------------------------------------
 */

static void
ComputePolygonBbox(canvas, polyPtr)
    Tk_Canvas canvas;                   /* Canvas that contains item. */
    PolygonItem *polyPtr;               /* Item whose bbox is to be
                                         * recomputed. */
{
    double *coordPtr;
    int i;
    double width;
    Tk_State state = polyPtr->header.state;
    Tk_TSOffset *tsoffset;

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    width = polyPtr->outline.width;
    if (polyPtr->coordPtr == NULL || (polyPtr->numPoints < 1) || (state==TK_STATE_HIDDEN)) {
        polyPtr->header.x1 = polyPtr->header.x2 =
        polyPtr->header.y1 = polyPtr->header.y2 = -1;
        return;
    }
    if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)polyPtr) {
        if (polyPtr->outline.activeWidth>width) {
            width = polyPtr->outline.activeWidth;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (polyPtr->outline.disabledWidth>0.0) {
            width = polyPtr->outline.disabledWidth;
        }
    }

    coordPtr = polyPtr->coordPtr;
    polyPtr->header.x1 = polyPtr->header.x2 = (int) *coordPtr;
    polyPtr->header.y1 = polyPtr->header.y2 = (int) coordPtr[1];

    /*
     * Compute the bounding box of all the points in the polygon,
     * then expand in all directions by the outline's width to take
     * care of butting or rounded corners and projecting or
     * rounded caps.  This expansion is an overestimate (worst-case
     * is square root of two over two) but it's simple.  Don't do
     * anything special for curves.  This causes an additional
     * overestimate in the bounding box, but is faster.
     */

    for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints-1;
            i++, coordPtr += 2) {
        TkIncludePoint((Tk_Item *) polyPtr, coordPtr);
    }

    tsoffset = &polyPtr->tsoffset;
    if (tsoffset->flags & TK_OFFSET_INDEX) {
        int index = tsoffset->flags & ~TK_OFFSET_INDEX;
        if (tsoffset->flags == INT_MAX) {
            index = (polyPtr->numPoints - polyPtr->autoClosed) * 2;
            if (index < 0) {
                index = 0;
            }
        }
        index %= (polyPtr->numPoints - polyPtr->autoClosed) * 2;
        if (index <0) {
            index += (polyPtr->numPoints - polyPtr->autoClosed) * 2;
        }
        tsoffset->xoffset = (int) (polyPtr->coordPtr[index] + 0.5);
        tsoffset->yoffset = (int) (polyPtr->coordPtr[index+1] + 0.5);
    } else {
        if (tsoffset->flags & TK_OFFSET_LEFT) {
            tsoffset->xoffset = polyPtr->header.x1;
        } else if (tsoffset->flags & TK_OFFSET_CENTER) {
            tsoffset->xoffset = (polyPtr->header.x1 + polyPtr->header.x2)/2;
        } else if (tsoffset->flags & TK_OFFSET_RIGHT) {
            tsoffset->xoffset = polyPtr->header.x2;
        }
        if (tsoffset->flags & TK_OFFSET_TOP) {
            tsoffset->yoffset = polyPtr->header.y1;
        } else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
            tsoffset->yoffset = (polyPtr->header.y1 + polyPtr->header.y2)/2;
        } else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
            tsoffset->yoffset = polyPtr->header.y2;
        }
    }

    if (polyPtr->outline.gc != None) {
        tsoffset = &polyPtr->outline.tsoffset;
        if (tsoffset) {
            if (tsoffset->flags & TK_OFFSET_INDEX) {
                int index = tsoffset->flags & ~TK_OFFSET_INDEX;
                if (tsoffset->flags == INT_MAX) {
                    index = (polyPtr->numPoints - 1) * 2;
                }
                index %= (polyPtr->numPoints - 1) * 2;
                if (index <0) {
                    index += (polyPtr->numPoints - 1) * 2;
                }
                tsoffset->xoffset = (int) (polyPtr->coordPtr[index] + 0.5);
                tsoffset->yoffset = (int) (polyPtr->coordPtr[index+1] + 0.5);
            } else {
                if (tsoffset->flags & TK_OFFSET_LEFT) {
                    tsoffset->xoffset = polyPtr->header.x1;
                } else if (tsoffset->flags & TK_OFFSET_CENTER) {
                    tsoffset->xoffset = (polyPtr->header.x1 + polyPtr->header.x2)/2;
                } else if (tsoffset->flags & TK_OFFSET_RIGHT) {
                    tsoffset->xoffset = polyPtr->header.x2;
                }
                if (tsoffset->flags & TK_OFFSET_TOP) {
                    tsoffset->yoffset = polyPtr->header.y1;
                } else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
                    tsoffset->yoffset = (polyPtr->header.y1 + polyPtr->header.y2)/2;
                } else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
                    tsoffset->yoffset = polyPtr->header.y2;
                }
            }
        }

        i = (int) ((width+1.5)/2.0);
        polyPtr->header.x1 -= i;
        polyPtr->header.x2 += i;
        polyPtr->header.y1 -= i;
        polyPtr->header.y2 += i;

        /*
         * For mitered lines, make a second pass through all the points.
         * Compute the locations of the two miter vertex points and add
         * those into the bounding box.
         */

        if (polyPtr->joinStyle == JoinMiter) {
            double miter[4];
            int j;
            coordPtr = polyPtr->coordPtr;
            if (polyPtr->numPoints>3) {
                if (TkGetMiterPoints(coordPtr+2*(polyPtr->numPoints-2),
                        coordPtr, coordPtr+2, width,
                        miter, miter+2)) {
                    for (j = 0; j < 4; j += 2) {
                        TkIncludePoint((Tk_Item *) polyPtr, miter+j);
                    }
                }
             }
            for (i = polyPtr->numPoints ; i >= 3;
                    i--, coordPtr += 2) {
    
                if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
                        width, miter, miter+2)) {
                    for (j = 0; j < 4; j += 2) {
                        TkIncludePoint((Tk_Item *) polyPtr, miter+j);
                    }
                }
            }
        }
    }

    /*
     * Add one more pixel of fudge factor just to be safe (e.g.
     * X may round differently than we do).
     */

    polyPtr->header.x1 -= 1;
    polyPtr->header.x2 += 1;
    polyPtr->header.y1 -= 1;
    polyPtr->header.y2 += 1;
}

/*
 *--------------------------------------------------------------
 *
 * TkFillPolygon --
 *
 *      This procedure is invoked to convert a polygon to screen
 *      coordinates and display it using a particular GC.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      ItemPtr is drawn in drawable using the transformation
 *      information in canvas.
 *
 *--------------------------------------------------------------
 */

void
TkFillPolygon(canvas, coordPtr, numPoints, display, drawable, gc, outlineGC)
    Tk_Canvas canvas;                   /* Canvas whose coordinate system
                                         * is to be used for drawing. */
    double *coordPtr;                   /* Array of coordinates for polygon:
                                         * x1, y1, x2, y2, .... */
    int numPoints;                      /* Twice this many coordinates are
                                         * present at *coordPtr. */
    Display *display;                   /* Display on which to draw polygon. */
    Drawable drawable;                  /* Pixmap or window in which to draw
                                         * polygon. */
    GC gc;                              /* Graphics context for drawing. */
    GC outlineGC;                       /* If not None, use this to draw an
                                         * outline around the polygon after
                                         * filling it. */
{
    XPoint staticPoints[MAX_STATIC_POINTS];
    XPoint *pointPtr;
    XPoint *pPtr;
    int i;

    /*
     * Build up an array of points in screen coordinates.  Use a
     * static array unless the polygon has an enormous number of points;
     * in this case, dynamically allocate an array.
     */

    if (numPoints <= MAX_STATIC_POINTS) {
        pointPtr = staticPoints;
    } else {
        pointPtr = (XPoint *) ckalloc((unsigned) (numPoints * sizeof(XPoint)));
    }

    for (i = 0, pPtr = pointPtr; i < numPoints; i += 1, coordPtr += 2, pPtr++) {
        Tk_CanvasDrawableCoords(canvas, coordPtr[0], coordPtr[1], &pPtr->x,
                &pPtr->y);
    }

    /*
     * Display polygon, then free up polygon storage if it was dynamically
     * allocated.
     */

    if (gc != None && numPoints>3) {
        XFillPolygon(display, drawable, gc, pointPtr, numPoints, Complex,
                CoordModeOrigin);
    }
    if (outlineGC != None) {
        XDrawLines(display, drawable, outlineGC, pointPtr,
            numPoints, CoordModeOrigin);
    }
    if (pointPtr != staticPoints) {
        ckfree((char *) pointPtr);
    }
}

/*
 *--------------------------------------------------------------
 *
 * DisplayPolygon --
 *
 *      This procedure is invoked to draw a polygon item in a given
 *      drawable.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      ItemPtr is drawn in drawable using the transformation
 *      information in canvas.
 *
 *--------------------------------------------------------------
 */

static void
DisplayPolygon(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). */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    Tk_State state = itemPtr->state;
    Pixmap stipple = polyPtr->fillStipple;
    double linewidth = polyPtr->outline.width;

    if (((polyPtr->fillGC == None) && (polyPtr->outline.gc == None)) ||
            (polyPtr->numPoints < 1) ||
            (polyPtr->numPoints < 3 && polyPtr->outline.gc == None)) {
        return;
    }

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (polyPtr->outline.activeWidth>linewidth) {
            linewidth = polyPtr->outline.activeWidth;
        }
        if (polyPtr->activeFillStipple != None) {
            stipple = polyPtr->activeFillStipple;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (polyPtr->outline.disabledWidth>0.0) {
            linewidth = polyPtr->outline.disabledWidth;
        }
        if (polyPtr->disabledFillStipple != None) {
            stipple = polyPtr->disabledFillStipple;
        }
    }
    /*
     * If we're stippling then modify the stipple offset in the GC.  Be
     * sure to reset the offset when done, since the GC is supposed to be
     * read-only.
     */

    if (stipple != None) {
        Tk_TSOffset *tsoffset = &polyPtr->tsoffset;
        int w=0; int h=0;
        int flags = tsoffset->flags;
        if (!(flags & TK_OFFSET_INDEX) && (flags & (TK_OFFSET_CENTER|TK_OFFSET_MIDDLE))) {
            Tk_SizeOfBitmap(display, stipple, &w, &h);
            if (flags & TK_OFFSET_CENTER) {
                w /= 2;
            } else {
                w = 0;
            }
            if (flags & TK_OFFSET_MIDDLE) {
                h /= 2;
            } else {
                h = 0;
            }
        }
        tsoffset->xoffset -= w;
        tsoffset->yoffset -= h;
        Tk_CanvasSetOffset(canvas, polyPtr->fillGC, tsoffset);
        tsoffset->xoffset += w;
        tsoffset->yoffset += h;
    }
    Tk_ChangeOutlineGC(canvas, itemPtr, &(polyPtr->outline));

    if(polyPtr->numPoints < 3) {
        short x,y;
        int intLineWidth = (int) (linewidth + 0.5);
        if (intLineWidth < 1) {
            intLineWidth = 1;
        }
        Tk_CanvasDrawableCoords(canvas, polyPtr->coordPtr[0],
                    polyPtr->coordPtr[1], &x,&y);
        XFillArc(display, drawable, polyPtr->outline.gc,
                x - intLineWidth/2, y - intLineWidth/2,
                (unsigned int)intLineWidth+1, (unsigned int)intLineWidth+1,
                0, 64*360);
    } else if (!polyPtr->smooth || polyPtr->numPoints < 4) {
        TkFillPolygon(canvas, polyPtr->coordPtr, polyPtr->numPoints,
                    display, drawable, polyPtr->fillGC, polyPtr->outline.gc);
    } else {
        int numPoints;
        XPoint staticPoints[MAX_STATIC_POINTS];
        XPoint *pointPtr;

        /*
         * This is a smoothed polygon.  Display using a set of generated
         * spline points rather than the original points.
         */

        numPoints = polyPtr->smooth->coordProc(canvas, (double *) NULL,
                polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
                (double *) NULL);
        if (numPoints <= MAX_STATIC_POINTS) {
            pointPtr = staticPoints;
        } else {
            pointPtr = (XPoint *) ckalloc((unsigned)
                    (numPoints * sizeof(XPoint)));
        }
        numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
                polyPtr->numPoints, polyPtr->splineSteps, pointPtr,
                (double *) NULL);
        if (polyPtr->fillGC != None) {
            XFillPolygon(display, drawable, polyPtr->fillGC, pointPtr,
                    numPoints, Complex, CoordModeOrigin);
        }
        if (polyPtr->outline.gc != None) {
            XDrawLines(display, drawable, polyPtr->outline.gc, pointPtr,
                    numPoints, CoordModeOrigin);
        }
        if (pointPtr != staticPoints) {
            ckfree((char *) pointPtr);
        }
    }
    Tk_ResetOutlineGC(canvas, itemPtr, &(polyPtr->outline));
    if (stipple != None) {
        XSetTSOrigin(display, polyPtr->fillGC, 0, 0);
    }
}

/*
 *--------------------------------------------------------------
 *
 * PolygonInsert --
 *
 *      Insert coords into a polugon item at a given index.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The coords in the given item is modified.
 *
 *--------------------------------------------------------------
 */

static void
PolygonInsert(canvas, itemPtr, beforeThis, obj)
    Tk_Canvas canvas;           /* Canvas containing text item. */
    Tk_Item *itemPtr;           /* Line item to be modified. */
    int beforeThis;             /* Index before which new coordinates
                                 * are to be inserted. */
    Tcl_Obj *obj;               /* New coordinates to be inserted. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int length, argc, i;
    Tcl_Obj **objv;
    double *new;
    Tk_State state = itemPtr->state;

    if (state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }

    if (!obj || (Tcl_ListObjGetElements((Tcl_Interp *) NULL, obj, &argc, &objv) != TCL_OK)
            || !argc || argc&1) {
        return;
    }
    length = 2*(polyPtr->numPoints - polyPtr->autoClosed);
    while(beforeThis>length) beforeThis-=length;
    while(beforeThis<0) beforeThis+=length;
    new = (double *) ckalloc((unsigned)(sizeof(double) * (length + 2 + argc)));
    for (i=0; i<beforeThis; i++) {
        new[i] = polyPtr->coordPtr[i];
    }
    for (i=0; i<argc; i++) {
        if (Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,objv[i],
                new+(i+beforeThis))!=TCL_OK) {
            ckfree((char *) new);
            return;
        }
    }

    for(i=beforeThis; i<length; i++) {
        new[i+argc] = polyPtr->coordPtr[i];
    }
    if(polyPtr->coordPtr) ckfree((char *) polyPtr->coordPtr);
    length+=argc;
    polyPtr->coordPtr = new;
    polyPtr->numPoints = (length/2) + polyPtr->autoClosed;

    /*
     * Close the polygon if it isn't already closed, or remove autoclosing
     * if the user's coordinates are now closed.
     */

    if (polyPtr->autoClosed) {
        if ((new[length-2] == new[0]) && (new[length-1] == new[1])) {
            polyPtr->autoClosed = 0;
            polyPtr->numPoints--;
        }
    }
    else {
        if ((new[length-2] != new[0]) || (new[length-1] != new[1])) {
            polyPtr->autoClosed = 1;
            polyPtr->numPoints++;
        }
    }

    new[length] = new[0];
    new[length+1] = new[1];
    if (((length-argc)>3) && (state != TK_STATE_HIDDEN)) {
        /*
         * This is some optimizing code that will result that only the part
         * of the polygon that changed (and the objects that are overlapping
         * with that part) need to be redrawn. A special flag is set that
         * instructs the general canvas code not to redraw the whole
         * object. If this flag is not set, the canvas will do the redrawing,
         * otherwise I have to do it here.
         */
        double width;
        int j;
        itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;

        /*
         * The header elements that normally are used for the
         * bounding box, are now used to calculate the bounding
         * box for only the part that has to be redrawn. That
         * doesn't matter, because afterwards the bounding
         * box has to be re-calculated anyway.
         */

        itemPtr->x1 = itemPtr->x2 = (int) polyPtr->coordPtr[beforeThis];
        itemPtr->y1 = itemPtr->y2 = (int) polyPtr->coordPtr[beforeThis+1];
        beforeThis-=2; argc+=4;
        if(polyPtr->smooth) {
            beforeThis-=2; argc+=4;
        } /* be carefull; beforeThis could now be negative */
        for(i=beforeThis; i<beforeThis+argc; i+=2) {
                j=i;
                if(j<0) j+=length;
                if(j>=length) j-=length;
                TkIncludePoint(itemPtr, polyPtr->coordPtr+j);
        }
        width = polyPtr->outline.width;
        if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
                if (polyPtr->outline.activeWidth>width) {
                    width = polyPtr->outline.activeWidth;
                }
        } else if (state==TK_STATE_DISABLED) {
                if (polyPtr->outline.disabledWidth>0.0) {
                    width = polyPtr->outline.disabledWidth;
                }
        }
        itemPtr->x1 -= (int) width; itemPtr->y1 -= (int) width;
        itemPtr->x2 += (int) width; itemPtr->y2 += (int) width;
        Tk_CanvasEventuallyRedraw(canvas,
                itemPtr->x1, itemPtr->y1,
                itemPtr->x2, itemPtr->y2);
    }

    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * PolygonDeleteCoords --
 *
 *      Delete one or more coordinates from a polygon item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Characters between "first" and "last", inclusive, get
 *      deleted from itemPtr.
 *
 *--------------------------------------------------------------
 */

static void
PolygonDeleteCoords(canvas, itemPtr, first, last)
    Tk_Canvas canvas;           /* Canvas containing itemPtr. */
    Tk_Item *itemPtr;           /* Item in which to delete characters. */
    int first;                  /* Index of first character to delete. */
    int last;                   /* Index of last character to delete. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int count, i;
    int length = 2*(polyPtr->numPoints - polyPtr->autoClosed);

    while(first>=length) first-=length;
    while(first<0)       first+=length;
    while(last>=length)  last-=length;
    while(last<0)        last+=length;

    first &= -2;
    last &= -2;

    count = last + 2 - first;
    if(count<=0) count +=length;

    if(count >= length) {
        polyPtr->numPoints = 0;
        if(polyPtr->coordPtr != NULL) {
            ckfree((char *) polyPtr->coordPtr);
        }
        ComputePolygonBbox(canvas, polyPtr);
        return;
    }

    if(last>=first) {
        for(i=last+2; i<length; i++) {
            polyPtr->coordPtr[i-count] = polyPtr->coordPtr[i];
        }
    } else {
        for(i=last; i<=first; i++) {
            polyPtr->coordPtr[i-last] = polyPtr->coordPtr[i];
        }
    }
    polyPtr->coordPtr[length-count] = polyPtr->coordPtr[0];
    polyPtr->coordPtr[length-count+1] = polyPtr->coordPtr[1];
    polyPtr->numPoints -= count/2;
    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * PolygonToPoint --
 *
 *      Computes the distance from a given point to a given
 *      polygon, in canvas units.
 *
 * Results:
 *      The return value is 0 if the point whose x and y coordinates
 *      are pointPtr[0] and pointPtr[1] is inside the polygon.  If the
 *      point isn't inside the polygon then the return value is the
 *      distance from the point to the polygon.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

        /* ARGSUSED */
static double
PolygonToPoint(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. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr, *polyPoints;
    double staticSpace[2*MAX_STATIC_POINTS];
    double poly[10];
    double radius;
    double bestDist, dist;
    int numPoints, count;
    int changedMiterToBevel;    /* Non-zero means that a mitered corner
                                 * had to be treated as beveled after all
                                 * because the angle was < 11 degrees. */
    double width;
    Tk_State state = itemPtr->state;

    bestDist = 1.0e36;

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    width = polyPtr->outline.width;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (polyPtr->outline.activeWidth>width) {
            width = polyPtr->outline.activeWidth;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (polyPtr->outline.disabledWidth>0.0) {
            width = polyPtr->outline.disabledWidth;
        }
    }
    radius = width/2.0;

    /*
     * Handle smoothed polygons by generating an expanded set of points
     * against which to do the check.
     */

    if ((polyPtr->smooth) && (polyPtr->numPoints>2)) {
        numPoints = polyPtr->smooth->coordProc(canvas, (double *) NULL,
                polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
                (double *) NULL);
        if (numPoints <= MAX_STATIC_POINTS) {
            polyPoints = staticSpace;
        } else {
            polyPoints = (double *) ckalloc((unsigned)
                    (2*numPoints*sizeof(double)));
        }
        numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
                polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
                polyPoints);
    } else {
        numPoints = polyPtr->numPoints;
        polyPoints = polyPtr->coordPtr;
    }

    bestDist = TkPolygonToPoint(polyPoints, numPoints, pointPtr);
    if (bestDist<=0.0) {
        goto donepoint;
    }
    if ((polyPtr->outline.gc != None) && (polyPtr->joinStyle == JoinRound)) {
        dist = bestDist - radius;
        if (dist <= 0.0) {
            bestDist = 0.0;
            goto donepoint;
        } else {
            bestDist = dist;
        }
    }

    if ((polyPtr->outline.gc == None) || (width <= 1)) goto donepoint;

    /*
     * The overall idea is to iterate through all of the edges of
     * the line, computing a polygon for each edge and testing the
     * point against that polygon.  In addition, there are additional
     * tests to deal with rounded joints and caps.
     */

    changedMiterToBevel = 0;
    for (count = numPoints, coordPtr = polyPoints; count >= 2;
            count--, coordPtr += 2) {

        /*
         * If rounding is done around the first point then compute
         * the distance between the point and the point.
         */

        if (polyPtr->joinStyle == JoinRound) {
            dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
                    - radius;
            if (dist <= 0.0) {
                bestDist = 0.0;
                goto donepoint;
            } else if (dist < bestDist) {
                bestDist = dist;
            }
        }

        /*
         * Compute the polygonal shape corresponding to this edge,
         * consisting of two points for the first point of the edge
         * and two points for the last point of the edge.
         */

        if (count == numPoints) {
            TkGetButtPoints(coordPtr+2, coordPtr, (double) width,
                    0, poly, poly+2);
        } else if ((polyPtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
            poly[0] = poly[6];
            poly[1] = poly[7];
            poly[2] = poly[4];
            poly[3] = poly[5];
        } else {
            TkGetButtPoints(coordPtr+2, coordPtr, (double) width, 0,
                    poly, poly+2);

            /*
             * If this line uses beveled joints, then check the distance
             * to a polygon comprising the last two points of the previous
             * polygon and the first two from this polygon;  this checks
             * the wedges that fill the mitered joint.
             */

            if ((polyPtr->joinStyle == JoinBevel) || changedMiterToBevel) {
                poly[8] = poly[0];
                poly[9] = poly[1];
                dist = TkPolygonToPoint(poly, 5, pointPtr);
                if (dist <= 0.0) {
                    bestDist = 0.0;
                    goto donepoint;
                } else if (dist < bestDist) {
                    bestDist = dist;
                }
                changedMiterToBevel = 0;
            }
        }
        if (count == 2) {
            TkGetButtPoints(coordPtr, coordPtr+2, (double) width,
                    0, poly+4, poly+6);
        } else if (polyPtr->joinStyle == JoinMiter) {
            if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
                    (double) width, poly+4, poly+6) == 0) {
                changedMiterToBevel = 1;
                TkGetButtPoints(coordPtr, coordPtr+2, (double) width,
                        0, poly+4, poly+6);
            }
        } else {
            TkGetButtPoints(coordPtr, coordPtr+2, (double) width, 0,
                    poly+4, poly+6);
        }
        poly[8] = poly[0];
        poly[9] = poly[1];
        dist = TkPolygonToPoint(poly, 5, pointPtr);
        if (dist <= 0.0) {
            bestDist = 0.0;
            goto donepoint;
        } else if (dist < bestDist) {
            bestDist = dist;
        }
    }

    donepoint:
    if ((polyPoints != staticSpace) && polyPoints != polyPtr->coordPtr) {
        ckfree((char *) polyPoints);
    }
    return bestDist;
}

/*
 *--------------------------------------------------------------
 *
 * PolygonToArea --
 *
 *      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
PolygonToArea(canvas, itemPtr, rectPtr)
    Tk_Canvas canvas;           /* Canvas containing item. */
    Tk_Item *itemPtr;           /* Item to check against polygon. */
    double *rectPtr;            /* Pointer to array of four coordinates
                                 * (x1, y1, x2, y2) describing rectangular
                                 * area.  */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr;
    double staticSpace[2*MAX_STATIC_POINTS];
    double *polyPoints, poly[10];
    double radius;
    int numPoints, count;
    int changedMiterToBevel;    /* Non-zero means that a mitered corner
                                 * had to be treated as beveled after all
                                 * because the angle was < 11 degrees. */
    int inside;                 /* Tentative guess about what to return,
                                 * based on all points seen so far:  one
                                 * means everything seen so far was
                                 * inside the area;  -1 means everything
                                 * was outside the area.  0 means overlap
                                 * has been found. */ 
    double width;
    Tk_State state = itemPtr->state;

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }

    width = polyPtr->outline.width;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (polyPtr->outline.activeWidth>width) {
            width = polyPtr->outline.activeWidth;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (polyPtr->outline.disabledWidth>0.0) {
            width = polyPtr->outline.disabledWidth;
        }
    }

    radius = width/2.0;
    inside = -1;

    if ((state==TK_STATE_HIDDEN) || polyPtr->numPoints<2) {
        return -1;
    } else if (polyPtr->numPoints <3) {
        double oval[4];
        oval[0] = polyPtr->coordPtr[0]-radius;
        oval[1] = polyPtr->coordPtr[1]-radius;
        oval[2] = polyPtr->coordPtr[0]+radius;
        oval[3] = polyPtr->coordPtr[1]+radius;
        return TkOvalToArea(oval, rectPtr);
    }
    /*
     * Handle smoothed polygons by generating an expanded set of points
     * against which to do the check.
     */

    if (polyPtr->smooth) {
        numPoints = polyPtr->smooth->coordProc(canvas, (double *) NULL,
                polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
                (double *) NULL);
        if (numPoints <= MAX_STATIC_POINTS) {
            polyPoints = staticSpace;
        } else {
            polyPoints = (double *) ckalloc((unsigned)
                    (2*numPoints*sizeof(double)));
        }
        numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
                polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
                polyPoints);
    } else {
        numPoints = polyPtr->numPoints;
        polyPoints = polyPtr->coordPtr;
    }

    if (polyPtr->fillGC != None) {
        inside = TkPolygonToArea(polyPoints, numPoints, rectPtr);
        if (inside==0) goto donearea;
    } else {
        if ((polyPoints[0] >= rectPtr[0])
                && (polyPoints[0] <= rectPtr[2])
                && (polyPoints[1] >= rectPtr[1])
                && (polyPoints[1] <= rectPtr[3])) {
            inside = 1;
        }
    }

    if (polyPtr->outline.gc == None) goto donearea ;


    /*
     * Iterate through all of the edges of the line, computing a polygon
     * for each edge and testing the area against that polygon.  In
     * addition, there are additional tests to deal with rounded joints
     * and caps.
     */

    changedMiterToBevel = 0;
    for (count = numPoints, coordPtr = polyPoints; count >= 2;
            count--, coordPtr += 2) {
 
        /*
         * If rounding is done around the first point of the edge
         * then test a circular region around the point with the
         * area.
         */

        if (polyPtr->joinStyle == JoinRound) {
            poly[0] = coordPtr[0] - radius;
            poly[1] = coordPtr[1] - radius;
            poly[2] = coordPtr[0] + radius;
            poly[3] = coordPtr[1] + radius;
            if (TkOvalToArea(poly, rectPtr) != inside) {
                inside = 0;
                goto donearea;
            }
        }

        /*
         * Compute the polygonal shape corresponding to this edge,
         * consisting of two points for the first point of the edge
         * and two points for the last point of the edge.
         */

        if (count == numPoints) {
            TkGetButtPoints(coordPtr+2, coordPtr, width,
                    0, poly, poly+2);
        } else if ((polyPtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
            poly[0] = poly[6];
            poly[1] = poly[7];
            poly[2] = poly[4];
            poly[3] = poly[5];
        } else {
            TkGetButtPoints(coordPtr+2, coordPtr, width, 0,
                    poly, poly+2);

            /*
             * If the last joint was beveled, then also check a
             * polygon comprising the last two points of the previous
             * polygon and the first two from this polygon;  this checks
             * the wedges that fill the beveled joint.
             */

            if ((polyPtr->joinStyle == JoinBevel) || changedMiterToBevel) {
                poly[8] = poly[0];
                poly[9] = poly[1];
                if (TkPolygonToArea(poly, 5, rectPtr) != inside) {
                    inside = 0;
                    goto donearea;
                }
                changedMiterToBevel = 0;
            }
        }
        if (count == 2) {
            TkGetButtPoints(coordPtr, coordPtr+2, width,
                    0, poly+4, poly+6);
        } else if (polyPtr->joinStyle == JoinMiter) {
            if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
                    width, poly+4, poly+6) == 0) {
                changedMiterToBevel = 1;
                TkGetButtPoints(coordPtr, coordPtr+2, width,
                        0, poly+4, poly+6);
            }
        } else {
            TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
                    poly+4, poly+6);
        }
        poly[8] = poly[0];
        poly[9] = poly[1];
        if (TkPolygonToArea(poly, 5, rectPtr) != inside) {
            inside = 0;
            goto donearea;
        }
    }

    donearea:
    if ((polyPoints != staticSpace) && (polyPoints != polyPtr->coordPtr)) {
        ckfree((char *) polyPoints);
    }
    return inside;
}

/*
 *--------------------------------------------------------------
 *
 * ScalePolygon --
 *
 *      This procedure is invoked to rescale a polygon item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The polygon referred to by itemPtr is rescaled so that the
 *      following transformation is applied to all point
 *      coordinates:
 *              x' = originX + scaleX*(x-originX)
 *              y' = originY + scaleY*(y-originY)
 *
 *--------------------------------------------------------------
 */

static void
ScalePolygon(canvas, itemPtr, originX, originY, scaleX, scaleY)
    Tk_Canvas canvas;                   /* Canvas containing polygon. */
    Tk_Item *itemPtr;                   /* Polygon 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. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr;
    int i;

    for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
            i++, coordPtr += 2) {
        *coordPtr = originX + scaleX*(*coordPtr - originX);
        coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
    }
    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * GetPolygonIndex --
 *
 *      Parse an index into a polygon item and return either its value
 *      or an error.
 *
 * Results:
 *      A standard Tcl result.  If all went well, then *indexPtr is
 *      filled in with the index (into itemPtr) corresponding to
 *      string.  Otherwise an error message is left in
 *      interp->result.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static int
GetPolygonIndex(interp, canvas, itemPtr, obj, indexPtr)
    Tcl_Interp *interp;         /* Used for error reporting. */
    Tk_Canvas canvas;           /* Canvas containing item. */
    Tk_Item *itemPtr;           /* Item for which the index is being
                                 * specified. */
    Tcl_Obj *obj;               /* Specification of a particular coord
                                 * in itemPtr's line. */
    int *indexPtr;              /* Where to store converted index. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    size_t length;
    char *string = Tcl_GetStringFromObj(obj, (int *) &length);

    if (string[0] == 'e') {
        if (strncmp(string, "end", length) == 0) {
            *indexPtr = 2*(polyPtr->numPoints - polyPtr->autoClosed);
        } else {
            badIndex:

            /*
             * Some of the paths here leave messages in interp->result,
             * so we have to clear it out before storing our own message.
             */

            Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
            Tcl_AppendResult(interp, "bad index \"", string, "\"",
                    (char *) NULL);
            return TCL_ERROR;
        }
    } else if (string[0] == '@') {
        int i;
        double x ,y, bestDist, dist, *coordPtr;
        char *end, *p;

        p = string+1;
        x = strtod(p, &end);
        if ((end == p) || (*end != ',')) {
            goto badIndex;
        }
        p = end+1;
        y = strtod(p, &end);
        if ((end == p) || (*end != 0)) {
            goto badIndex;
        }
        bestDist = 1.0e36;
        coordPtr = polyPtr->coordPtr;
        *indexPtr = 0;
        for(i=0; i<(polyPtr->numPoints-1); i++) {
            dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
            if (dist<bestDist) {
                bestDist = dist;
                *indexPtr = 2*i;
            }
            coordPtr += 2;
        }
    } else {
        int count = 2*(polyPtr->numPoints - polyPtr->autoClosed);
        if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
            goto badIndex;
        }
        *indexPtr &= -2; /* if odd, make it even */
        if (count) {
            if (*indexPtr > 0) {
                *indexPtr = ((*indexPtr - 2) % count) + 2;
            } else {
                *indexPtr = -((-(*indexPtr)) % count);
            }
        } else {
            *indexPtr = 0;
        }
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * TranslatePolygon --
 *
 *      This procedure is called to move a polygon by a given
 *      amount.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The position of the polygon is offset by (xDelta, yDelta),
 *      and the bounding box is updated in the generic part of the
 *      item structure.
 *
 *--------------------------------------------------------------
 */

static void
TranslatePolygon(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. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr;
    int i;

    for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
            i++, coordPtr += 2) {
        *coordPtr += deltaX;
        coordPtr[1] += deltaY;
    }
    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * PolygonToPostscript --
 *
 *      This procedure is called to generate Postscript for
 *      polygon items.
 *
 * Results:
 *      The return value is a standard Tcl result.  If an error
 *      occurs in generating Postscript then an error message is
 *      left in the interp's result, replacing whatever used
 *      to be there.  If no error occurs, then Postscript for the
 *      item is appended to the result.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static int
PolygonToPostscript(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. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    char *style;
    XColor *color;
    XColor *fillColor;
    Pixmap stipple;
    Pixmap fillStipple;
    Tk_State state = itemPtr->state;
    double width;

    if (polyPtr->numPoints<2 || polyPtr->coordPtr==NULL) {
        return TCL_OK;
    }

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    width = polyPtr->outline.width;
    color = polyPtr->outline.color;
    stipple = polyPtr->fillStipple;
    fillColor = polyPtr->fillColor;
    fillStipple = polyPtr->fillStipple;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (polyPtr->outline.activeWidth>width) {
            width = polyPtr->outline.activeWidth;
        }
        if (polyPtr->outline.activeColor!=NULL) {
            color = polyPtr->outline.activeColor;
        }
        if (polyPtr->outline.activeStipple!=None) {
            stipple = polyPtr->outline.activeStipple;
        }
        if (polyPtr->activeFillColor!=NULL) {
            fillColor = polyPtr->activeFillColor;
        }
        if (polyPtr->activeFillStipple!=None) {
            fillStipple = polyPtr->activeFillStipple;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (polyPtr->outline.disabledWidth>0.0) {
            width = polyPtr->outline.disabledWidth;
        }
        if (polyPtr->outline.disabledColor!=NULL) {
            color = polyPtr->outline.disabledColor;
        }
        if (polyPtr->outline.disabledStipple!=None) {
            stipple = polyPtr->outline.disabledStipple;
        }
        if (polyPtr->disabledFillColor!=NULL) {
            fillColor = polyPtr->disabledFillColor;
        }
        if (polyPtr->disabledFillStipple!=None) {
            fillStipple = polyPtr->disabledFillStipple;
        }
    }
    if (polyPtr->numPoints==2) {
        char string[128];
        sprintf(string, "%.15g %.15g translate %.15g %.15g",
                polyPtr->coordPtr[0], Tk_CanvasPsY(canvas, polyPtr->coordPtr[1]),
                width/2.0, width/2.0);
        Tcl_AppendResult(interp, "matrix currentmatrix\n",string,
                " scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n", (char *) NULL);
        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, "fill\n", (char *) NULL);
        }
        return TCL_OK;
    }

    /*
     * Fill the area of the polygon.
     */

    if (fillColor != NULL && polyPtr->numPoints>3) {
        if (!polyPtr->smooth || !polyPtr->smooth->postscriptProc) {
            Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
                    polyPtr->numPoints);
        } else {
            polyPtr->smooth->postscriptProc(interp, canvas, polyPtr->coordPtr,
                    polyPtr->numPoints, polyPtr->splineSteps);
        }
        if (Tk_CanvasPsColor(interp, canvas, fillColor) != TCL_OK) {
            return TCL_ERROR;
        }
        if (fillStipple != None) {
            Tcl_AppendResult(interp, "eoclip ", (char *) NULL);
            if (Tk_CanvasPsStipple(interp, canvas, fillStipple)
                    != TCL_OK) {
                return TCL_ERROR;
            }
            if (color != NULL) {
                Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL);
            }
        } else {
            Tcl_AppendResult(interp, "eofill\n", (char *) NULL);
        }
    }

    /*
     * Now draw the outline, if there is one.
     */

    if (color != NULL) {

        if (!polyPtr->smooth || !polyPtr->smooth->postscriptProc) {
            Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
                polyPtr->numPoints);
        } else {
            polyPtr->smooth->postscriptProc(interp, canvas, polyPtr->coordPtr,
                polyPtr->numPoints, polyPtr->splineSteps);
        }

        if (polyPtr->joinStyle == JoinRound) {
            style = "1";
        } else if (polyPtr->joinStyle == JoinBevel) {
            style = "2";
        } else {
            style = "0";
        }
        Tcl_AppendResult(interp, style," setlinejoin 1 setlinecap\n",
                (char *) NULL);
        if (Tk_CanvasPsOutline(canvas, itemPtr,
                &(polyPtr->outline)) != TCL_OK) {
            return TCL_ERROR;
        }
    }
    return TCL_OK;
}

/* End of tkcanvpoly.c */