/*
* tkCanvBmap.c --
*
* This file implements bitmap items for canvas widgets.
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkCanvBmap.c,v 1.7.2.1 2003/04/18 21:56:47 hobbs Exp $
*/
#include "tkInt.h"
#include "tkPort.h"
#include "tkCanvases.h"
/*
* The structure below defines the record for each bitmap item.
*/
typedef struct BitmapItem {
Tk_Item header; /* Generic stuff that's the same for all
* types. MUST BE FIRST IN STRUCTURE. */
double x, y; /* Coordinates of positioning point for
* bitmap. */
Tk_Anchor anchor; /* Where to anchor bitmap relative to
* (x,y). */
Pixmap bitmap; /* Bitmap to display in window. */
Pixmap activeBitmap; /* Bitmap to display in window. */
Pixmap disabledBitmap; /* Bitmap to display in window. */
XColor *fgColor; /* Foreground color to use for bitmap. */
XColor *activeFgColor; /* Foreground color to use for bitmap. */
XColor *disabledFgColor; /* Foreground color to use for bitmap. */
XColor *bgColor; /* Background color to use for bitmap. */
XColor *activeBgColor; /* Background color to use for bitmap. */
XColor *disabledBgColor; /* Background color to use for bitmap. */
GC gc; /* Graphics context to use for drawing
* bitmap on screen. */
} BitmapItem;
/*
* Information used for parsing configuration specs:
*/
static Tk_CustomOption stateOption = {
TkStateParseProc,
TkStatePrintProc, (ClientData) 2
};
static Tk_CustomOption tagsOption = {
Tk_CanvasTagsParseProc,
Tk_CanvasTagsPrintProc, (ClientData) NULL
};
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_COLOR, "-activebackground", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, activeBgColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-activebitmap", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, activeBitmap), TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-activeforeground", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, activeFgColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
"center", Tk_Offset(BitmapItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_COLOR, "-background", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, bgColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-bitmap", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, bitmap), TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-disabledbackground", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, disabledBgColor),
TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-disabledbitmap", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, disabledBitmap),
TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-disabledforeground", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(BitmapItem, disabledFgColor),
TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-foreground", (char *) NULL, (char *) NULL,
"black", Tk_Offset(BitmapItem, fgColor), 0},
{TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
&stateOption},
{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
{TK_CONFIG_CALLBACK, "-updatecommand", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(Tk_Item, updateCmd), TK_CONFIG_NULL_OK},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* Prototypes for procedures defined in this file:
*/
static int BitmapCoords _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *CONST objv[]));
static int BitmapToArea _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double *rectPtr));
static double BitmapToPoint _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double *coordPtr));
static int BitmapToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
static void ComputeBitmapBbox _ANSI_ARGS_((Tk_Canvas canvas,
BitmapItem *bmapPtr));
static int ConfigureBitmap _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *CONST objv[], int flags));
static int TkcCreateBitmap _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, struct Tk_Item *itemPtr,
int objc, Tcl_Obj *CONST objv[]));
static void DeleteBitmap _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display));
static void DisplayBitmap _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display, Drawable dst,
int x, int y, int width, int height));
static void ScaleBitmap _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double originX, double originY,
double scaleX, double scaleY));
static void TranslateBitmap _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double deltaX, double deltaY));
/*
* The structures below defines the bitmap item type in terms of
* procedures that can be invoked by generic item code.
*/
Tk_ItemType tkBitmapType = {
"bitmap", /* name */
sizeof(BitmapItem), /* itemSize */
TkcCreateBitmap, /* createProc */
configSpecs, /* configSpecs */
ConfigureBitmap, /* configureProc */
BitmapCoords, /* coordProc */
DeleteBitmap, /* deleteProc */
DisplayBitmap, /* displayProc */
TK_CONFIG_OBJS, /* flags */
BitmapToPoint, /* pointProc */
BitmapToArea, /* areaProc */
BitmapToPostscript, /* postscriptProc */
ScaleBitmap, /* scaleProc */
TranslateBitmap, /* translateProc */
(Tk_ItemIndexProc *) NULL, /* indexProc */
(Tk_ItemCursorProc *) NULL, /* icursorProc */
(Tk_ItemSelectionProc *) NULL, /* selectionProc */
(Tk_ItemInsertProc *) NULL, /* insertProc */
(Tk_ItemDCharsProc *) NULL, /* dTextProc */
(Tk_ItemType *) NULL, /* nextPtr */
};
/*
*--------------------------------------------------------------
*
* TkcCreateBitmap --
*
* This procedure is invoked to create a new bitmap
* 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 bitmap item is created.
*
*--------------------------------------------------------------
*/
static int
TkcCreateBitmap(interp, canvas, itemPtr, objc, objv)
Tcl_Interp *interp; /* Interpreter for error reporting. */
Tk_Canvas canvas; /* Canvas to hold new item. */
Tk_Item *itemPtr; /* Record to hold new item; header
* has been initialized by caller. */
int objc; /* Number of arguments in objv. */
Tcl_Obj *CONST objv[]; /* Arguments describing rectangle. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
int i;
if (objc == 0) {
panic("canvas did not pass any coords\n");
}
/*
* Initialize item's record.
*/
bmapPtr->anchor = TK_ANCHOR_CENTER;
bmapPtr->bitmap = None;
bmapPtr->activeBitmap = None;
bmapPtr->disabledBitmap = None;
bmapPtr->fgColor = NULL;
bmapPtr->activeFgColor = NULL;
bmapPtr->disabledFgColor = NULL;
bmapPtr->bgColor = NULL;
bmapPtr->activeBgColor = NULL;
bmapPtr->disabledBgColor = NULL;
bmapPtr->gc = None;
/*
* Process the arguments to fill in the item record.
* Only 1 (list) or 2 (x y) coords are allowed.
*/
if (objc == 1) {
i = 1;
} else {
char *arg = Tcl_GetString(objv[1]);
i = 2;
if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
i = 1;
}
}
if (BitmapCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
goto error;
}
if (ConfigureBitmap(interp, canvas, itemPtr, objc-i, objv+i, 0)
== TCL_OK) {
return TCL_OK;
}
error:
DeleteBitmap(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* BitmapCoords --
*
* This procedure is invoked to process the "coords" widget
* command on bitmap items. 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
BitmapCoords(interp, canvas, itemPtr, objc, objv)
Tcl_Interp *interp; /* Used for error reporting. */
Tk_Canvas canvas; /* Canvas containing item. */
Tk_Item *itemPtr; /* Item whose coordinates are to be
* read or modified. */
int objc; /* Number of coordinates supplied in
* objv. */
Tcl_Obj *CONST objv[]; /* Array of coordinates: x1, y1,
* x2, y2, ... */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
if (objc == 0) {
Tcl_Obj *obj = Tcl_NewObj();
Tcl_Obj *subobj = Tcl_NewDoubleObj(bmapPtr->x);
Tcl_ListObjAppendElement(interp, obj, subobj);
subobj = Tcl_NewDoubleObj(bmapPtr->y);
Tcl_ListObjAppendElement(interp, obj, subobj);
Tcl_SetObjResult(interp, obj);
} else if (objc < 3) {
if (objc == 1) {
if (Tcl_ListObjGetElements(interp, objv[0], &objc,
(Tcl_Obj ***) &objv) != TCL_OK) {
return TCL_ERROR;
} else if (objc != 2) {
char buf[64 + TCL_INTEGER_SPACE];
sprintf(buf, "wrong # coordinates: expected 2, got %d", objc);
Tcl_SetResult(interp, buf, TCL_VOLATILE);
return TCL_ERROR;
}
}
if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],
&bmapPtr->x) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp, canvas, objv[1],
&bmapPtr->y) != TCL_OK)) {
return TCL_ERROR;
}
ComputeBitmapBbox(canvas, bmapPtr);
} else {
char buf[64 + TCL_INTEGER_SPACE];
sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", objc);
Tcl_SetResult(interp, buf, TCL_VOLATILE);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ConfigureBitmap --
*
* This procedure is invoked to configure various aspects
* of a bitmap item, such as its anchor position.
*
* 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 may be set for itemPtr.
*
*--------------------------------------------------------------
*/
static int
ConfigureBitmap(interp, canvas, itemPtr, objc, objv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
Tk_Canvas canvas; /* Canvas containing itemPtr. */
Tk_Item *itemPtr; /* Bitmap item to reconfigure. */
int objc; /* Number of elements in objv. */
Tcl_Obj *CONST objv[]; /* Arguments describing things to configure. */
int flags; /* Flags to pass to Tk_ConfigureWidget. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
XGCValues gcValues;
GC newGC;
Tk_Window tkwin;
unsigned long mask;
XColor *fgColor;
XColor *bgColor;
Pixmap bitmap;
Tk_State state;
tkwin = Tk_CanvasTkwin(canvas);
if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
objv, (char *) bmapPtr, flags|TK_CONFIG_OBJS)) {
return TCL_ERROR;
}
/*
* A few of the options require additional processing, such as those
* that determine the graphics context.
*/
state = Tk_GetItemState(canvas, itemPtr);
if (bmapPtr->activeFgColor!=NULL ||
bmapPtr->activeBgColor!=NULL ||
bmapPtr->activeBitmap!=None) {
itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
} else {
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
}
if (state==TK_STATE_HIDDEN) {
ComputeBitmapBbox(canvas, bmapPtr);
return TCL_OK;
}
fgColor = bmapPtr->fgColor;
bgColor = bmapPtr->bgColor;
bitmap = bmapPtr->bitmap;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (bmapPtr->activeFgColor!=NULL) {
fgColor = bmapPtr->activeFgColor;
}
if (bmapPtr->activeBgColor!=NULL) {
bgColor = bmapPtr->activeBgColor;
}
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state==TK_STATE_DISABLED) {
if (bmapPtr->disabledFgColor!=NULL) {
fgColor = bmapPtr->disabledFgColor;
}
if (bmapPtr->disabledBgColor!=NULL) {
bgColor = bmapPtr->disabledBgColor;
}
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
if (state==TK_STATE_DISABLED || bitmap == None) {
ComputeBitmapBbox(canvas, bmapPtr);
return TCL_OK;
}
gcValues.foreground = fgColor->pixel;
mask = GCForeground;
if (bgColor != NULL) {
gcValues.background = bgColor->pixel;
mask |= GCBackground;
} else {
gcValues.clip_mask = bitmap;
mask |= GCClipMask;
}
if (bitmap == None) {
newGC = None;
} else {
newGC = Tk_GetGC(tkwin, mask, &gcValues);
}
if (bmapPtr->gc != None) {
Tk_FreeGC(Tk_Display(tkwin), bmapPtr->gc);
}
bmapPtr->gc = newGC;
ComputeBitmapBbox(canvas, bmapPtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DeleteBitmap --
*
* This procedure is called to clean up the data structure
* associated with a bitmap item.
*
* Results:
* None.
*
* Side effects:
* Resources associated with itemPtr are released.
*
*--------------------------------------------------------------
*/
static void
DeleteBitmap(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. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
if (bmapPtr->bitmap != None) {
Tk_FreeBitmap(display, bmapPtr->bitmap);
}
if (bmapPtr->activeBitmap != None) {
Tk_FreeBitmap(display, bmapPtr->activeBitmap);
}
if (bmapPtr->disabledBitmap != None) {
Tk_FreeBitmap(display, bmapPtr->disabledBitmap);
}
if (bmapPtr->fgColor != NULL) {
Tk_FreeColor(bmapPtr->fgColor);
}
if (bmapPtr->activeFgColor != NULL) {
Tk_FreeColor(bmapPtr->activeFgColor);
}
if (bmapPtr->disabledFgColor != NULL) {
Tk_FreeColor(bmapPtr->disabledFgColor);
}
if (bmapPtr->bgColor != NULL) {
Tk_FreeColor(bmapPtr->bgColor);
}
if (bmapPtr->activeBgColor != NULL) {
Tk_FreeColor(bmapPtr->activeBgColor);
}
if (bmapPtr->disabledBgColor != NULL) {
Tk_FreeColor(bmapPtr->disabledBgColor);
}
if (bmapPtr->gc != NULL) {
Tk_FreeGC(display, bmapPtr->gc);
}
}
/*
*--------------------------------------------------------------
*
* ComputeBitmapBbox --
*
* This procedure is invoked to compute the bounding box of
* all the pixels that may be drawn as part of a bitmap item.
* This procedure is where the child bitmap's placement is
* computed.
*
* Results:
* None.
*
* Side effects:
* The fields x1, y1, x2, and y2 are updated in the header
* for itemPtr.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static void
ComputeBitmapBbox(canvas, bmapPtr)
Tk_Canvas canvas; /* Canvas that contains item. */
BitmapItem *bmapPtr; /* Item whose bbox is to be
* recomputed. */
{
int width, height;
int x, y;
Pixmap bitmap;
Tk_State state = Tk_GetItemState(canvas, &bmapPtr->header);
bitmap = bmapPtr->bitmap;
if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)bmapPtr) {
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state==TK_STATE_DISABLED) {
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
x = (int) (bmapPtr->x + ((bmapPtr->x >= 0) ? 0.5 : - 0.5));
y = (int) (bmapPtr->y + ((bmapPtr->y >= 0) ? 0.5 : - 0.5));
if (state==TK_STATE_HIDDEN || bitmap == None) {
bmapPtr->header.x1 = bmapPtr->header.x2 = x;
bmapPtr->header.y1 = bmapPtr->header.y2 = y;
return;
}
/*
* Compute location and size of bitmap, using anchor information.
*/
Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bmapPtr->bitmap,
&width, &height);
switch (bmapPtr->anchor) {
case TK_ANCHOR_N:
x -= width/2;
break;
case TK_ANCHOR_NE:
x -= width;
break;
case TK_ANCHOR_E:
x -= width;
y -= height/2;
break;
case TK_ANCHOR_SE:
x -= width;
y -= height;
break;
case TK_ANCHOR_S:
x -= width/2;
y -= height;
break;
case TK_ANCHOR_SW:
y -= height;
break;
case TK_ANCHOR_W:
y -= height/2;
break;
case TK_ANCHOR_NW:
break;
case TK_ANCHOR_CENTER:
x -= width/2;
y -= height/2;
break;
}
/*
* Store the information in the item header.
*/
bmapPtr->header.x1 = x;
bmapPtr->header.y1 = y;
bmapPtr->header.x2 = x + width;
bmapPtr->header.y2 = y + height;
}
/*
*--------------------------------------------------------------
*
* DisplayBitmap --
*
* This procedure is invoked to draw a bitmap item in a given
* drawable.
*
* Results:
* None.
*
* Side effects:
* ItemPtr is drawn in drawable using the transformation
* information in canvas.
*
*--------------------------------------------------------------
*/
static void
DisplayBitmap(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). */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
int bmapX, bmapY, bmapWidth, bmapHeight;
short drawableX, drawableY;
XColor *fgColor;
XColor *bgColor;
Pixmap bitmap;
Tk_State state = Tk_GetItemState(canvas, itemPtr);
/*
* If the area being displayed doesn't cover the whole bitmap,
* then only redisplay the part of the bitmap that needs
* redisplay.
*/
fgColor = bmapPtr->fgColor;
bgColor = bmapPtr->bgColor;
bitmap = bmapPtr->bitmap;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (bmapPtr->activeFgColor!=NULL) {
fgColor = bmapPtr->activeFgColor;
}
if (bmapPtr->activeBgColor!=NULL) {
bgColor = bmapPtr->activeBgColor;
}
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state==TK_STATE_DISABLED) {
if (bmapPtr->disabledFgColor!=NULL) {
fgColor = bmapPtr->disabledFgColor;
}
if (bmapPtr->disabledBgColor!=NULL) {
bgColor = bmapPtr->disabledBgColor;
}
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
if (bitmap != None) {
if (x > bmapPtr->header.x1) {
bmapX = x - bmapPtr->header.x1;
bmapWidth = bmapPtr->header.x2 - x;
} else {
bmapX = 0;
if ((x+width) < bmapPtr->header.x2) {
bmapWidth = x + width - bmapPtr->header.x1;
} else {
bmapWidth = bmapPtr->header.x2 - bmapPtr->header.x1;
}
}
if (y > bmapPtr->header.y1) {
bmapY = y - bmapPtr->header.y1;
bmapHeight = bmapPtr->header.y2 - y;
} else {
bmapY = 0;
if ((y+height) < bmapPtr->header.y2) {
bmapHeight = y + height - bmapPtr->header.y1;
} else {
bmapHeight = bmapPtr->header.y2 - bmapPtr->header.y1;
}
}
Tk_CanvasDrawableCoords(canvas,
(double) (bmapPtr->header.x1 + bmapX),
(double) (bmapPtr->header.y1 + bmapY),
&drawableX, &drawableY);
/*
* Must modify the mask origin within the graphics context
* to line up with the bitmap's origin (in order to make
* bitmaps with "-background {}" work right).
*/
XSetClipOrigin(display, bmapPtr->gc, drawableX - bmapX,
drawableY - bmapY);
XCopyPlane(display, bitmap, drawable,
bmapPtr->gc, bmapX, bmapY, (unsigned int) bmapWidth,
(unsigned int) bmapHeight, drawableX, drawableY, 1);
XSetClipOrigin(display, bmapPtr->gc, 0, 0);
}
}
/*
*--------------------------------------------------------------
*
* BitmapToPoint --
*
* Computes the distance from a given point to a given
* rectangle, in canvas units.
*
* Results:
* The return value is 0 if the point whose x and y coordinates
* are coordPtr[0] and coordPtr[1] is inside the 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 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
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[100 + TCL_DOUBLE_SPACE * 2 + TCL_INTEGER_SPACE * 4];
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;
}