678 lines
19 KiB
C
678 lines
19 KiB
C
/*
|
||
* tkCanvImg.c --
|
||
*
|
||
* This file implements image items for canvas widgets.
|
||
*
|
||
* Copyright (c) 1994 The Regents of the University of California.
|
||
* Copyright (c) 1994-1996 Sun Microsystems, Inc.
|
||
*
|
||
* See the file "license.terms" for information on usage and redistribution
|
||
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
*
|
||
* SCCS: @(#) tkCanvImg.c 1.17 96/02/17 17:18:43
|
||
*/
|
||
|
||
#include <stdio.h>
|
||
#include "tkInt.h"
|
||
#include "tkPort.h"
|
||
#include "tkCanvas.h"
|
||
|
||
/*
|
||
* The structure below defines the record for each image item.
|
||
*/
|
||
|
||
typedef struct ImageItem {
|
||
Tk_Item header; /* Generic stuff that's the same for all
|
||
* types. MUST BE FIRST IN STRUCTURE. */
|
||
Tk_Canvas canvas; /* Canvas containing the image. */
|
||
double x, y; /* Coordinates of positioning point for
|
||
* image. */
|
||
Tk_Anchor anchor; /* Where to anchor image relative to
|
||
* (x,y). */
|
||
char *imageString; /* String describing -image option (malloc-ed).
|
||
* NULL means no image right now. */
|
||
Tk_Image image; /* Image to display in window, or NULL if
|
||
* no image at present. */
|
||
} ImageItem;
|
||
|
||
/*
|
||
* Information used for parsing configuration specs:
|
||
*/
|
||
|
||
static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
|
||
Tk_CanvasTagsPrintProc, (ClientData) NULL
|
||
};
|
||
|
||
static Tk_ConfigSpec configSpecs[] = {
|
||
{TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
|
||
"center", Tk_Offset(ImageItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
|
||
{TK_CONFIG_STRING, "-image", (char *) NULL, (char *) NULL,
|
||
(char *) NULL, Tk_Offset(ImageItem, imageString), TK_CONFIG_NULL_OK},
|
||
{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
|
||
(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
|
||
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
|
||
(char *) NULL, 0, 0}
|
||
};
|
||
|
||
/*
|
||
* Prototypes for procedures defined in this file:
|
||
*/
|
||
|
||
static void ImageChangedProc _ANSI_ARGS_((ClientData clientData,
|
||
int x, int y, int width, int height, int imgWidth,
|
||
int imgHeight));
|
||
static int ImageCoords _ANSI_ARGS_((Tcl_Interp *interp,
|
||
Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
|
||
char **argv));
|
||
static int ImageToArea _ANSI_ARGS_((Tk_Canvas canvas,
|
||
Tk_Item *itemPtr, double *rectPtr));
|
||
static double ImageToPoint _ANSI_ARGS_((Tk_Canvas canvas,
|
||
Tk_Item *itemPtr, double *coordPtr));
|
||
static void ComputeImageBbox _ANSI_ARGS_((Tk_Canvas canvas,
|
||
ImageItem *imgPtr));
|
||
static int ConfigureImage _ANSI_ARGS_((Tcl_Interp *interp,
|
||
Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
|
||
char **argv, int flags));
|
||
static int CreateImage _ANSI_ARGS_((Tcl_Interp *interp,
|
||
Tk_Canvas canvas, struct Tk_Item *itemPtr,
|
||
int argc, char **argv));
|
||
static void DeleteImage _ANSI_ARGS_((Tk_Canvas canvas,
|
||
Tk_Item *itemPtr, Display *display));
|
||
static void DisplayImage _ANSI_ARGS_((Tk_Canvas canvas,
|
||
Tk_Item *itemPtr, Display *display, Drawable dst,
|
||
int x, int y, int width, int height));
|
||
static void ScaleImage _ANSI_ARGS_((Tk_Canvas canvas,
|
||
Tk_Item *itemPtr, double originX, double originY,
|
||
double scaleX, double scaleY));
|
||
static void TranslateImage _ANSI_ARGS_((Tk_Canvas canvas,
|
||
Tk_Item *itemPtr, double deltaX, double deltaY));
|
||
|
||
/*
|
||
* The structures below defines the image item type in terms of
|
||
* procedures that can be invoked by generic item code.
|
||
*/
|
||
|
||
Tk_ItemType tkImageType = {
|
||
"image", /* name */
|
||
sizeof(ImageItem), /* itemSize */
|
||
CreateImage, /* createProc */
|
||
configSpecs, /* configSpecs */
|
||
ConfigureImage, /* configureProc */
|
||
ImageCoords, /* coordProc */
|
||
DeleteImage, /* deleteProc */
|
||
DisplayImage, /* displayProc */
|
||
0, /* alwaysRedraw */
|
||
ImageToPoint, /* pointProc */
|
||
ImageToArea, /* areaProc */
|
||
(Tk_ItemPostscriptProc *) NULL, /* postscriptProc */
|
||
ScaleImage, /* scaleProc */
|
||
TranslateImage, /* 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 */
|
||
};
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* CreateImage --
|
||
*
|
||
* This procedure is invoked to create a new image
|
||
* item in a canvas.
|
||
*
|
||
* Results:
|
||
* A standard Tcl return value. If an error occurred in
|
||
* creating the item, then an error message is left in
|
||
* interp->result; in this case itemPtr is left uninitialized,
|
||
* so it can be safely freed by the caller.
|
||
*
|
||
* Side effects:
|
||
* A new image item is created.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
CreateImage(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. */
|
||
char **argv; /* Arguments describing rectangle. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
|
||
if (argc < 2) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
|
||
itemPtr->typePtr->name, " x y ?options?\"",
|
||
(char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* Initialize item's record.
|
||
*/
|
||
|
||
imgPtr->canvas = canvas;
|
||
imgPtr->anchor = TK_ANCHOR_CENTER;
|
||
imgPtr->imageString = NULL;
|
||
imgPtr->image = NULL;
|
||
|
||
/*
|
||
* Process the arguments to fill in the item record.
|
||
*/
|
||
|
||
if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &imgPtr->x) != TCL_OK)
|
||
|| (Tk_CanvasGetCoord(interp, canvas, argv[1], &imgPtr->y)
|
||
!= TCL_OK)) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
if (ConfigureImage(interp, canvas, itemPtr, argc-2, argv+2, 0) != TCL_OK) {
|
||
DeleteImage(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
|
||
return TCL_ERROR;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ImageCoords --
|
||
*
|
||
* This procedure is invoked to process the "coords" widget
|
||
* command on image items. See the user documentation for
|
||
* details on what it does.
|
||
*
|
||
* Results:
|
||
* Returns TCL_OK or TCL_ERROR, and sets interp->result.
|
||
*
|
||
* Side effects:
|
||
* The coordinates for the given item may be changed.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ImageCoords(interp, canvas, itemPtr, argc, argv)
|
||
Tcl_Interp *interp; /* Used for error reporting. */
|
||
Tk_Canvas canvas; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item whose coordinates are to be
|
||
* read or modified. */
|
||
int argc; /* Number of coordinates supplied in
|
||
* argv. */
|
||
char **argv; /* Array of coordinates: x1, y1,
|
||
* x2, y2, ... */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
char x[TCL_DOUBLE_SPACE], y[TCL_DOUBLE_SPACE];
|
||
|
||
if (argc == 0) {
|
||
Tcl_PrintDouble(interp, imgPtr->x, x);
|
||
Tcl_PrintDouble(interp, imgPtr->y, y);
|
||
Tcl_AppendResult(interp, x, " ", y, (char *) NULL);
|
||
} else if (argc == 2) {
|
||
if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &imgPtr->x) != TCL_OK)
|
||
|| (Tk_CanvasGetCoord(interp, canvas, argv[1],
|
||
&imgPtr->y) != TCL_OK)) {
|
||
return TCL_ERROR;
|
||
}
|
||
ComputeImageBbox(canvas, imgPtr);
|
||
} else {
|
||
sprintf(interp->result,
|
||
"wrong # coordinates: expected 0 or 2, got %d", argc);
|
||
return TCL_ERROR;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ConfigureImage --
|
||
*
|
||
* This procedure is invoked to configure various aspects
|
||
* of an image item, such as its anchor position.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result code. If an error occurs, then
|
||
* an error message is left in interp->result.
|
||
*
|
||
* Side effects:
|
||
* Configuration information may be set for itemPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ConfigureImage(interp, canvas, itemPtr, argc, argv, flags)
|
||
Tcl_Interp *interp; /* Used for error reporting. */
|
||
Tk_Canvas canvas; /* Canvas containing itemPtr. */
|
||
Tk_Item *itemPtr; /* Image item to reconfigure. */
|
||
int argc; /* Number of elements in argv. */
|
||
char **argv; /* Arguments describing things to configure. */
|
||
int flags; /* Flags to pass to Tk_ConfigureWidget. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
Tk_Window tkwin;
|
||
Tk_Image image;
|
||
|
||
tkwin = Tk_CanvasTkwin(canvas);
|
||
if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc,
|
||
argv, (char *) imgPtr, flags) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* Create the image. Save the old image around and don't free it
|
||
* until after the new one is allocated. This keeps the reference
|
||
* count from going to zero so the image doesn't have to be recreated
|
||
* if it hasn't changed.
|
||
*/
|
||
|
||
if (imgPtr->imageString != NULL) {
|
||
image = Tk_GetImage(interp, tkwin, imgPtr->imageString,
|
||
ImageChangedProc, (ClientData) imgPtr);
|
||
if (image == NULL) {
|
||
return TCL_ERROR;
|
||
}
|
||
} else {
|
||
image = NULL;
|
||
}
|
||
if (imgPtr->image != NULL) {
|
||
Tk_FreeImage(imgPtr->image);
|
||
}
|
||
imgPtr->image = image;
|
||
ComputeImageBbox(canvas, imgPtr);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DeleteImage --
|
||
*
|
||
* This procedure is called to clean up the data structure
|
||
* associated with a image item.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Resources associated with itemPtr are released.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DeleteImage(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. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
|
||
if (imgPtr->imageString != NULL) {
|
||
ckfree(imgPtr->imageString);
|
||
}
|
||
if (imgPtr->image != NULL) {
|
||
Tk_FreeImage(imgPtr->image);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ComputeImageBbox --
|
||
*
|
||
* This procedure is invoked to compute the bounding box of
|
||
* all the pixels that may be drawn as part of a image item.
|
||
* This procedure is where the child image'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
|
||
ComputeImageBbox(canvas, imgPtr)
|
||
Tk_Canvas canvas; /* Canvas that contains item. */
|
||
ImageItem *imgPtr; /* Item whose bbox is to be
|
||
* recomputed. */
|
||
{
|
||
int width, height;
|
||
int x, y;
|
||
|
||
x = imgPtr->x + ((imgPtr->x >= 0) ? 0.5 : - 0.5);
|
||
y = imgPtr->y + ((imgPtr->y >= 0) ? 0.5 : - 0.5);
|
||
|
||
if (imgPtr->image == None) {
|
||
imgPtr->header.x1 = imgPtr->header.x2 = x;
|
||
imgPtr->header.y1 = imgPtr->header.y2 = y;
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* Compute location and size of image, using anchor information.
|
||
*/
|
||
|
||
Tk_SizeOfImage(imgPtr->image, &width, &height);
|
||
switch (imgPtr->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.
|
||
*/
|
||
|
||
imgPtr->header.x1 = x;
|
||
imgPtr->header.y1 = y;
|
||
imgPtr->header.x2 = x + width;
|
||
imgPtr->header.y2 = y + height;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DisplayImage --
|
||
*
|
||
* This procedure is invoked to draw a image item in a given
|
||
* drawable.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* ItemPtr is drawn in drawable using the transformation
|
||
* information in canvas.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayImage(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). */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
short drawableX, drawableY;
|
||
|
||
if (imgPtr->image == NULL) {
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* Translate the coordinates to those of the image, then redisplay it.
|
||
*/
|
||
|
||
Tk_CanvasDrawableCoords(canvas, (double) x, (double) y,
|
||
&drawableX, &drawableY);
|
||
Tk_RedrawImage(imgPtr->image, x - imgPtr->header.x1, y - imgPtr->header.y1,
|
||
width, height, drawable, drawableX, drawableY);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ImageToPoint --
|
||
*
|
||
* 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 image. If the
|
||
* point isn't inside the image then the return value is the
|
||
* distance from the point to the image.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static double
|
||
ImageToPoint(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. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
double x1, x2, y1, y2, xDiff, yDiff;
|
||
|
||
x1 = imgPtr->header.x1;
|
||
y1 = imgPtr->header.y1;
|
||
x2 = imgPtr->header.x2;
|
||
y2 = imgPtr->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);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ImageToArea --
|
||
*
|
||
* 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.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ImageToArea(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. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
|
||
if ((rectPtr[2] <= imgPtr->header.x1)
|
||
|| (rectPtr[0] >= imgPtr->header.x2)
|
||
|| (rectPtr[3] <= imgPtr->header.y1)
|
||
|| (rectPtr[1] >= imgPtr->header.y2)) {
|
||
return -1;
|
||
}
|
||
if ((rectPtr[0] <= imgPtr->header.x1)
|
||
&& (rectPtr[1] <= imgPtr->header.y1)
|
||
&& (rectPtr[2] >= imgPtr->header.x2)
|
||
&& (rectPtr[3] >= imgPtr->header.y2)) {
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleImage --
|
||
*
|
||
* This procedure is invoked to rescale an item.
|
||
*
|
||
* 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
|
||
ScaleImage(canvas, itemPtr, originX, originY, scaleX, scaleY)
|
||
Tk_Canvas canvas; /* Canvas containing rectangle. */
|
||
Tk_Item *itemPtr; /* Rectangle to be scaled. */
|
||
double originX, originY; /* Origin about which to scale rect. */
|
||
double scaleX; /* Amount to scale in X direction. */
|
||
double scaleY; /* Amount to scale in Y direction. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
|
||
imgPtr->x = originX + scaleX*(imgPtr->x - originX);
|
||
imgPtr->y = originY + scaleY*(imgPtr->y - originY);
|
||
ComputeImageBbox(canvas, imgPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TranslateImage --
|
||
*
|
||
* 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
|
||
TranslateImage(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. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
|
||
imgPtr->x += deltaX;
|
||
imgPtr->y += deltaY;
|
||
ComputeImageBbox(canvas, imgPtr);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ImageChangedProc --
|
||
*
|
||
* This procedure is invoked by the image code whenever the manager
|
||
* for an image does something that affects the image's size or
|
||
* how it is displayed.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Arranges for the canvas to get redisplayed.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ImageChangedProc(clientData, x, y, width, height, imgWidth, imgHeight)
|
||
ClientData clientData; /* Pointer to canvas item for image. */
|
||
int x, y; /* Upper left pixel (within image)
|
||
* that must be redisplayed. */
|
||
int width, height; /* Dimensions of area to redisplay
|
||
* (may be <= 0). */
|
||
int imgWidth, imgHeight; /* New dimensions of image. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) clientData;
|
||
|
||
/*
|
||
* If the image's size changed and it's not anchored at its
|
||
* northwest corner then just redisplay the entire area of the
|
||
* image. This is a bit over-conservative, but we need to do
|
||
* something because a size change also means a position change.
|
||
*/
|
||
|
||
if (((imgPtr->header.x2 - imgPtr->header.x1) != imgWidth)
|
||
|| ((imgPtr->header.y2 - imgPtr->header.y1) != imgHeight)) {
|
||
x = y = 0;
|
||
width = imgWidth;
|
||
height = imgHeight;
|
||
Tk_CanvasEventuallyRedraw(imgPtr->canvas, imgPtr->header.x1,
|
||
imgPtr->header.y1, imgPtr->header.x2, imgPtr->header.y2);
|
||
}
|
||
ComputeImageBbox(imgPtr->canvas, imgPtr);
|
||
Tk_CanvasEventuallyRedraw(imgPtr->canvas, imgPtr->header.x1 + x,
|
||
imgPtr->header.y1 + y, (int) (imgPtr->header.x1 + x + width),
|
||
(int) (imgPtr->header.y1 + y + height));
|
||
}
|