801 lines
23 KiB
C
801 lines
23 KiB
C
/*
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* tkCanvBmap.c --
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*
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* This file implements bitmap items for canvas widgets.
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*
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* Copyright (c) 1992-1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkCanvBmap.c 1.30 96/05/03 10:49:00
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*/
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#include <stdio.h>
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#include "tkInt.h"
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#include "tkPort.h"
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#include "tkCanvas.h"
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/*
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* The structure below defines the record for each bitmap item.
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*/
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typedef struct BitmapItem {
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Tk_Item header; /* Generic stuff that's the same for all
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* types. MUST BE FIRST IN STRUCTURE. */
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double x, y; /* Coordinates of positioning point for
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* bitmap. */
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Tk_Anchor anchor; /* Where to anchor bitmap relative to
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* (x,y). */
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Pixmap bitmap; /* Bitmap to display in window. */
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XColor *fgColor; /* Foreground color to use for bitmap. */
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XColor *bgColor; /* Background color to use for bitmap. */
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GC gc; /* Graphics context to use for drawing
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* bitmap on screen. */
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} BitmapItem;
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/*
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* Information used for parsing configuration specs:
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*/
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static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
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Tk_CanvasTagsPrintProc, (ClientData) NULL
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};
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static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
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"center", Tk_Offset(BitmapItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_COLOR, "-background", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(BitmapItem, bgColor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_BITMAP, "-bitmap", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(BitmapItem, bitmap), TK_CONFIG_NULL_OK},
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{TK_CONFIG_COLOR, "-foreground", (char *) NULL, (char *) NULL,
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"black", Tk_Offset(BitmapItem, fgColor), 0},
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{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
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(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) NULL, 0, 0}
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};
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/*
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* Prototypes for procedures defined in this file:
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*/
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static int BitmapCoords _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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char **argv));
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static int BitmapToArea _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double *rectPtr));
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static double BitmapToPoint _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double *coordPtr));
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static int BitmapToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
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static void ComputeBitmapBbox _ANSI_ARGS_((Tk_Canvas canvas,
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BitmapItem *bmapPtr));
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static int ConfigureBitmap _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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char **argv, int flags));
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static int CreateBitmap _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, struct Tk_Item *itemPtr,
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int argc, char **argv));
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static void DeleteBitmap _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display));
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static void DisplayBitmap _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display, Drawable dst,
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int x, int y, int width, int height));
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static void ScaleBitmap _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double originX, double originY,
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double scaleX, double scaleY));
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static void TranslateBitmap _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double deltaX, double deltaY));
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/*
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* The structures below defines the bitmap item type in terms of
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* procedures that can be invoked by generic item code.
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*/
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Tk_ItemType tkBitmapType = {
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"bitmap", /* name */
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sizeof(BitmapItem), /* itemSize */
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CreateBitmap, /* createProc */
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configSpecs, /* configSpecs */
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ConfigureBitmap, /* configureProc */
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BitmapCoords, /* coordProc */
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DeleteBitmap, /* deleteProc */
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DisplayBitmap, /* displayProc */
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0, /* alwaysRedraw */
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BitmapToPoint, /* pointProc */
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BitmapToArea, /* areaProc */
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BitmapToPostscript, /* postscriptProc */
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ScaleBitmap, /* scaleProc */
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TranslateBitmap, /* translateProc */
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(Tk_ItemIndexProc *) NULL, /* indexProc */
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(Tk_ItemCursorProc *) NULL, /* icursorProc */
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(Tk_ItemSelectionProc *) NULL, /* selectionProc */
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(Tk_ItemInsertProc *) NULL, /* insertProc */
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(Tk_ItemDCharsProc *) NULL, /* dTextProc */
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(Tk_ItemType *) NULL /* nextPtr */
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};
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/*
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*--------------------------------------------------------------
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*
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* CreateBitmap --
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*
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* This procedure is invoked to create a new bitmap
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* item in a canvas.
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*
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* Results:
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* A standard Tcl return value. If an error occurred in
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* creating the item, then an error message is left in
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* interp->result; in this case itemPtr is left uninitialized,
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* so it can be safely freed by the caller.
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*
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* Side effects:
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* A new bitmap item is created.
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*
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*--------------------------------------------------------------
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*/
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static int
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CreateBitmap(interp, canvas, itemPtr, argc, argv)
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Tcl_Interp *interp; /* Interpreter for error reporting. */
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Tk_Canvas canvas; /* Canvas to hold new item. */
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Tk_Item *itemPtr; /* Record to hold new item; header
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* has been initialized by caller. */
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int argc; /* Number of arguments in argv. */
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char **argv; /* Arguments describing rectangle. */
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{
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BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
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if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
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itemPtr->typePtr->name, " x y ?options?\"",
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(char *) NULL);
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return TCL_ERROR;
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}
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/*
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* Initialize item's record.
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*/
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bmapPtr->anchor = TK_ANCHOR_CENTER;
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bmapPtr->bitmap = None;
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bmapPtr->fgColor = NULL;
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bmapPtr->bgColor = NULL;
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bmapPtr->gc = None;
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/*
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* Process the arguments to fill in the item record.
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*/
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if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &bmapPtr->x) != TCL_OK)
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|| (Tk_CanvasGetCoord(interp, canvas, argv[1], &bmapPtr->y)
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!= TCL_OK)) {
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return TCL_ERROR;
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}
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if (ConfigureBitmap(interp, canvas, itemPtr, argc-2, argv+2, 0) != TCL_OK) {
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DeleteBitmap(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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*--------------------------------------------------------------
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*
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* BitmapCoords --
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*
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* This procedure is invoked to process the "coords" widget
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* command on bitmap items. See the user documentation for
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* details on what it does.
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*
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* Results:
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* Returns TCL_OK or TCL_ERROR, and sets interp->result.
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*
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* Side effects:
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* The coordinates for the given item may be changed.
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*
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*--------------------------------------------------------------
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*/
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static int
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BitmapCoords(interp, canvas, itemPtr, argc, argv)
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Tcl_Interp *interp; /* Used for error reporting. */
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Tk_Canvas canvas; /* Canvas containing item. */
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Tk_Item *itemPtr; /* Item whose coordinates are to be
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* read or modified. */
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int argc; /* Number of coordinates supplied in
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* argv. */
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char **argv; /* Array of coordinates: x1, y1,
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* x2, y2, ... */
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{
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BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
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char x[TCL_DOUBLE_SPACE], y[TCL_DOUBLE_SPACE];
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if (argc == 0) {
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Tcl_PrintDouble(interp, bmapPtr->x, x);
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Tcl_PrintDouble(interp, bmapPtr->y, y);
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Tcl_AppendResult(interp, x, " ", y, (char *) NULL);
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} else if (argc == 2) {
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if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &bmapPtr->x) != TCL_OK)
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|| (Tk_CanvasGetCoord(interp, canvas, argv[1], &bmapPtr->y)
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!= TCL_OK)) {
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return TCL_ERROR;
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}
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ComputeBitmapBbox(canvas, bmapPtr);
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} else {
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sprintf(interp->result,
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"wrong # coordinates: expected 0 or 2, got %d", argc);
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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*--------------------------------------------------------------
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*
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* ConfigureBitmap --
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*
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* This procedure is invoked to configure various aspects
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* of a bitmap item, such as its anchor position.
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*
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* Results:
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* A standard Tcl result code. If an error occurs, then
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* an error message is left in interp->result.
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*
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* Side effects:
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* Configuration information may be set for itemPtr.
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*
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*--------------------------------------------------------------
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*/
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static int
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ConfigureBitmap(interp, canvas, itemPtr, argc, argv, flags)
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Tcl_Interp *interp; /* Used for error reporting. */
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Tk_Canvas canvas; /* Canvas containing itemPtr. */
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Tk_Item *itemPtr; /* Bitmap item to reconfigure. */
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int argc; /* Number of elements in argv. */
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char **argv; /* Arguments describing things to configure. */
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int flags; /* Flags to pass to Tk_ConfigureWidget. */
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{
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BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
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XGCValues gcValues;
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GC newGC;
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Tk_Window tkwin;
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unsigned long mask;
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tkwin = Tk_CanvasTkwin(canvas);
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if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv,
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(char *) bmapPtr, flags) != TCL_OK) {
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return TCL_ERROR;
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}
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/*
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* A few of the options require additional processing, such as those
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* that determine the graphics context.
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*/
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gcValues.foreground = bmapPtr->fgColor->pixel;
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mask = GCForeground;
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if (bmapPtr->bgColor != NULL) {
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gcValues.background = bmapPtr->bgColor->pixel;
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mask |= GCBackground;
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} else {
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gcValues.clip_mask = bmapPtr->bitmap;
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mask |= GCClipMask;
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}
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newGC = Tk_GetGC(tkwin, mask, &gcValues);
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if (bmapPtr->gc != None) {
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Tk_FreeGC(Tk_Display(tkwin), bmapPtr->gc);
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}
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bmapPtr->gc = newGC;
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ComputeBitmapBbox(canvas, bmapPtr);
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return TCL_OK;
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}
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/*
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*--------------------------------------------------------------
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*
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* DeleteBitmap --
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*
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* This procedure is called to clean up the data structure
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* associated with a bitmap item.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Resources associated with itemPtr are released.
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*
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*--------------------------------------------------------------
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*/
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static void
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DeleteBitmap(canvas, itemPtr, display)
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Tk_Canvas canvas; /* Info about overall canvas widget. */
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Tk_Item *itemPtr; /* Item that is being deleted. */
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Display *display; /* Display containing window for
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* canvas. */
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{
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BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
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if (bmapPtr->bitmap != None) {
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Tk_FreeBitmap(display, bmapPtr->bitmap);
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}
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if (bmapPtr->fgColor != NULL) {
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Tk_FreeColor(bmapPtr->fgColor);
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}
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if (bmapPtr->bgColor != NULL) {
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Tk_FreeColor(bmapPtr->bgColor);
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}
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if (bmapPtr->gc != NULL) {
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Tk_FreeGC(display, bmapPtr->gc);
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}
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}
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/*
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*--------------------------------------------------------------
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*
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* ComputeBitmapBbox --
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*
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* This procedure is invoked to compute the bounding box of
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* all the pixels that may be drawn as part of a bitmap item.
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* This procedure is where the child bitmap's placement is
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* computed.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The fields x1, y1, x2, and y2 are updated in the header
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* for itemPtr.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static void
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ComputeBitmapBbox(canvas, bmapPtr)
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Tk_Canvas canvas; /* Canvas that contains item. */
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BitmapItem *bmapPtr; /* Item whose bbox is to be
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* recomputed. */
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{
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int width, height;
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int x, y;
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x = (int) (bmapPtr->x + ((bmapPtr->x >= 0) ? 0.5 : - 0.5));
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y = (int) (bmapPtr->y + ((bmapPtr->y >= 0) ? 0.5 : - 0.5));
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if (bmapPtr->bitmap == None) {
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bmapPtr->header.x1 = bmapPtr->header.x2 = x;
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bmapPtr->header.y1 = bmapPtr->header.y2 = y;
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return;
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}
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/*
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* Compute location and size of bitmap, using anchor information.
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*/
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Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bmapPtr->bitmap,
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&width, &height);
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switch (bmapPtr->anchor) {
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case TK_ANCHOR_N:
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x -= width/2;
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break;
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case TK_ANCHOR_NE:
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x -= width;
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break;
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case TK_ANCHOR_E:
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x -= width;
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y -= height/2;
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break;
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case TK_ANCHOR_SE:
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x -= width;
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y -= height;
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break;
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case TK_ANCHOR_S:
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x -= width/2;
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y -= height;
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break;
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case TK_ANCHOR_SW:
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y -= height;
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break;
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case TK_ANCHOR_W:
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y -= height/2;
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break;
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case TK_ANCHOR_NW:
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break;
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case TK_ANCHOR_CENTER:
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x -= width/2;
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y -= height/2;
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break;
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}
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/*
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* Store the information in the item header.
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*/
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bmapPtr->header.x1 = x;
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bmapPtr->header.y1 = y;
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bmapPtr->header.x2 = x + width;
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bmapPtr->header.y2 = y + height;
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}
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/*
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*--------------------------------------------------------------
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*
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* DisplayBitmap --
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*
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* This procedure is invoked to draw a bitmap item in a given
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* drawable.
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*
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* Results:
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* None.
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*
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* Side effects:
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* ItemPtr is drawn in drawable using the transformation
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* information in canvas.
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*
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*--------------------------------------------------------------
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*/
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static void
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DisplayBitmap(canvas, itemPtr, display, drawable, x, y, width, height)
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Tk_Canvas canvas; /* Canvas that contains item. */
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Tk_Item *itemPtr; /* Item to be displayed. */
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Display *display; /* Display on which to draw item. */
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Drawable drawable; /* Pixmap or window in which to draw
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* item. */
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int x, y, width, height; /* Describes region of canvas that
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* must be redisplayed (not used). */
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{
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BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
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int bmapX, bmapY, bmapWidth, bmapHeight;
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short drawableX, drawableY;
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/*
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* If the area being displayed doesn't cover the whole bitmap,
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* then only redisplay the part of the bitmap that needs
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* redisplay.
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*/
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if (bmapPtr->bitmap != None) {
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if (x > bmapPtr->header.x1) {
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bmapX = x - bmapPtr->header.x1;
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bmapWidth = bmapPtr->header.x2 - x;
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} else {
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bmapX = 0;
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if ((x+width) < bmapPtr->header.x2) {
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bmapWidth = x + width - bmapPtr->header.x1;
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} else {
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bmapWidth = bmapPtr->header.x2 - bmapPtr->header.x1;
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}
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}
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if (y > bmapPtr->header.y1) {
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bmapY = y - bmapPtr->header.y1;
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bmapHeight = bmapPtr->header.y2 - y;
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} else {
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bmapY = 0;
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if ((y+height) < bmapPtr->header.y2) {
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bmapHeight = y + height - bmapPtr->header.y1;
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} else {
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bmapHeight = bmapPtr->header.y2 - bmapPtr->header.y1;
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}
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}
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Tk_CanvasDrawableCoords(canvas,
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(double) (bmapPtr->header.x1 + bmapX),
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(double) (bmapPtr->header.y1 + bmapY),
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&drawableX, &drawableY);
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/*
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* Must modify the mask origin within the graphics context
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* to line up with the bitmap's origin (in order to make
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* bitmaps with "-background {}" work right).
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*/
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XSetClipOrigin(display, bmapPtr->gc, drawableX - bmapX,
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drawableY - bmapY);
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XCopyPlane(display, bmapPtr->bitmap, drawable,
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bmapPtr->gc, bmapX, bmapY, (unsigned int) bmapWidth,
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(unsigned int) bmapHeight, drawableX, drawableY, 1);
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}
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}
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/*
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*--------------------------------------------------------------
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*
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* BitmapToPoint --
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*
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* Computes the distance from a given point to a given
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* rectangle, in canvas units.
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*
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* Results:
|
||
* The return value is 0 if the point whose x and y coordinates
|
||
* are coordPtr[0] and coordPtr[1] is inside the bitmap. If the
|
||
* point isn't inside the bitmap then the return value is the
|
||
* distance from the point to the bitmap.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static double
|
||
BitmapToPoint(canvas, itemPtr, coordPtr)
|
||
Tk_Canvas canvas; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against point. */
|
||
double *coordPtr; /* Pointer to x and y coordinates. */
|
||
{
|
||
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
|
||
double x1, x2, y1, y2, xDiff, yDiff;
|
||
|
||
x1 = bmapPtr->header.x1;
|
||
y1 = bmapPtr->header.y1;
|
||
x2 = bmapPtr->header.x2;
|
||
y2 = bmapPtr->header.y2;
|
||
|
||
/*
|
||
* Point is outside rectangle.
|
||
*/
|
||
|
||
if (coordPtr[0] < x1) {
|
||
xDiff = x1 - coordPtr[0];
|
||
} else if (coordPtr[0] > x2) {
|
||
xDiff = coordPtr[0] - x2;
|
||
} else {
|
||
xDiff = 0;
|
||
}
|
||
|
||
if (coordPtr[1] < y1) {
|
||
yDiff = y1 - coordPtr[1];
|
||
} else if (coordPtr[1] > y2) {
|
||
yDiff = coordPtr[1] - y2;
|
||
} else {
|
||
yDiff = 0;
|
||
}
|
||
|
||
return hypot(xDiff, yDiff);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* BitmapToArea --
|
||
*
|
||
* 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
|
||
BitmapToArea(canvas, itemPtr, rectPtr)
|
||
Tk_Canvas canvas; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item to check against rectangle. */
|
||
double *rectPtr; /* Pointer to array of four coordinates
|
||
* (x1, y1, x2, y2) describing rectangular
|
||
* area. */
|
||
{
|
||
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
|
||
|
||
if ((rectPtr[2] <= bmapPtr->header.x1)
|
||
|| (rectPtr[0] >= bmapPtr->header.x2)
|
||
|| (rectPtr[3] <= bmapPtr->header.y1)
|
||
|| (rectPtr[1] >= bmapPtr->header.y2)) {
|
||
return -1;
|
||
}
|
||
if ((rectPtr[0] <= bmapPtr->header.x1)
|
||
&& (rectPtr[1] <= bmapPtr->header.y1)
|
||
&& (rectPtr[2] >= bmapPtr->header.x2)
|
||
&& (rectPtr[3] >= bmapPtr->header.y2)) {
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleBitmap --
|
||
*
|
||
* This procedure is invoked to rescale a bitmap item in a
|
||
* canvas. It is one of the standard item procedures for
|
||
* bitmap items, and is invoked by the generic canvas code.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The item 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
|
||
ScaleBitmap(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 item. */
|
||
double scaleX; /* Amount to scale in X direction. */
|
||
double scaleY; /* Amount to scale in Y direction. */
|
||
{
|
||
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
|
||
|
||
bmapPtr->x = originX + scaleX*(bmapPtr->x - originX);
|
||
bmapPtr->y = originY + scaleY*(bmapPtr->y - originY);
|
||
ComputeBitmapBbox(canvas, bmapPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TranslateBitmap --
|
||
*
|
||
* This procedure is called to move an item by a given amount.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The position of the item is offset by (xDelta, yDelta), and
|
||
* the bounding box is updated in the generic part of the item
|
||
* structure.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
TranslateBitmap(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. */
|
||
{
|
||
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
|
||
|
||
bmapPtr->x += deltaX;
|
||
bmapPtr->y += deltaY;
|
||
ComputeBitmapBbox(canvas, bmapPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* BitmapToPostscript --
|
||
*
|
||
* This procedure is called to generate Postscript for
|
||
* bitmap 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 item is appended
|
||
* to the result.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
BitmapToPostscript(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. */
|
||
{
|
||
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
|
||
double x, y;
|
||
int width, height, rowsAtOnce, rowsThisTime;
|
||
int curRow;
|
||
char buffer[200];
|
||
|
||
if (bmapPtr->bitmap == None) {
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* Compute the coordinates of the lower-left corner of the bitmap,
|
||
* taking into account the anchor position for the bitmp.
|
||
*/
|
||
|
||
x = bmapPtr->x;
|
||
y = Tk_CanvasPsY(canvas, bmapPtr->y);
|
||
Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bmapPtr->bitmap,
|
||
&width, &height);
|
||
switch (bmapPtr->anchor) {
|
||
case TK_ANCHOR_NW: y -= height; break;
|
||
case TK_ANCHOR_N: x -= width/2.0; y -= height; break;
|
||
case TK_ANCHOR_NE: x -= width; y -= height; break;
|
||
case TK_ANCHOR_E: x -= width; y -= height/2.0; break;
|
||
case TK_ANCHOR_SE: x -= width; break;
|
||
case TK_ANCHOR_S: x -= width/2.0; break;
|
||
case TK_ANCHOR_SW: break;
|
||
case TK_ANCHOR_W: y -= height/2.0; break;
|
||
case TK_ANCHOR_CENTER: x -= width/2.0; y -= height/2.0; break;
|
||
}
|
||
|
||
/*
|
||
* Color the background, if there is one.
|
||
*/
|
||
|
||
if (bmapPtr->bgColor != NULL) {
|
||
sprintf(buffer,
|
||
"%.15g %.15g moveto %d 0 rlineto 0 %d rlineto %d %s\n",
|
||
x, y, width, height, -width,"0 rlineto closepath");
|
||
Tcl_AppendResult(interp, buffer, (char *) NULL);
|
||
if (Tk_CanvasPsColor(interp, canvas, bmapPtr->bgColor) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
Tcl_AppendResult(interp, "fill\n", (char *) NULL);
|
||
}
|
||
|
||
/*
|
||
* Draw the bitmap, if there is a foreground color. If the bitmap
|
||
* is very large, then chop it up into multiple bitmaps, each
|
||
* consisting of one or more rows. This is needed because Postscript
|
||
* can't handle single strings longer than 64 KBytes long.
|
||
*/
|
||
|
||
if (bmapPtr->fgColor != NULL) {
|
||
if (Tk_CanvasPsColor(interp, canvas, bmapPtr->fgColor) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (width > 60000) {
|
||
Tcl_ResetResult(interp);
|
||
Tcl_AppendResult(interp, "can't generate Postscript",
|
||
" for bitmaps more than 60000 pixels wide",
|
||
(char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
rowsAtOnce = 60000/width;
|
||
if (rowsAtOnce < 1) {
|
||
rowsAtOnce = 1;
|
||
}
|
||
sprintf(buffer, "%.15g %.15g translate\n", x, y+height);
|
||
Tcl_AppendResult(interp, buffer, (char *) NULL);
|
||
for (curRow = 0; curRow < height; curRow += rowsAtOnce) {
|
||
rowsThisTime = rowsAtOnce;
|
||
if (rowsThisTime > (height - curRow)) {
|
||
rowsThisTime = height - curRow;
|
||
}
|
||
sprintf(buffer, "0 -%.15g translate\n%d %d true matrix {\n",
|
||
(double) rowsThisTime, width, rowsThisTime);
|
||
Tcl_AppendResult(interp, buffer, (char *) NULL);
|
||
if (Tk_CanvasPsBitmap(interp, canvas, bmapPtr->bitmap,
|
||
0, curRow, width, rowsThisTime) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
Tcl_AppendResult(interp, "\n} imagemask\n", (char *) NULL);
|
||
}
|
||
}
|
||
return TCL_OK;
|
||
}
|