884 lines
24 KiB
C
884 lines
24 KiB
C
/*
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* tkCanvImg.c --
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*
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* This file implements image items for canvas widgets.
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*
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* Copyright (c) 1994 The Regents of the University of California.
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* Copyright (c) 1994-1997 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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#include "tkInt.h"
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#include "tkCanvas.h"
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/*
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* The structure below defines the record for each image item.
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*/
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typedef struct ImageItem {
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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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Tk_Canvas canvas; /* Canvas containing the image. */
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double x, y; /* Coordinates of positioning point for
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* image. */
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Tk_Anchor anchor; /* Where to anchor image relative to (x,y). */
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char *imageString; /* String describing -image option
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* (malloc-ed). NULL means no image right
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* now. */
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char *activeImageString; /* String describing -activeimage option.
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* NULL means no image right now. */
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char *disabledImageString; /* String describing -disabledimage option.
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* NULL means no image right now. */
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Tk_Image image; /* Image to display in window, or NULL if no
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* image at present. */
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Tk_Image activeImage; /* Image to display in window, or NULL if no
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* image at present. */
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Tk_Image disabledImage; /* Image to display in window, or NULL if no
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* image at present. */
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} ImageItem;
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/*
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* Information used for parsing configuration specs:
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*/
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static const Tk_CustomOption stateOption = {
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TkStateParseProc, TkStatePrintProc, INT2PTR(2)
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};
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static const Tk_CustomOption tagsOption = {
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Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, NULL
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};
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static const Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_STRING, "-activeimage", NULL, NULL,
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NULL, Tk_Offset(ImageItem, activeImageString), TK_CONFIG_NULL_OK, NULL},
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{TK_CONFIG_ANCHOR, "-anchor", NULL, NULL,
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"center", Tk_Offset(ImageItem, anchor), TK_CONFIG_DONT_SET_DEFAULT, NULL},
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{TK_CONFIG_STRING, "-disabledimage", NULL, NULL,
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NULL, Tk_Offset(ImageItem, disabledImageString), TK_CONFIG_NULL_OK, NULL},
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{TK_CONFIG_STRING, "-image", NULL, NULL,
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NULL, Tk_Offset(ImageItem, imageString), TK_CONFIG_NULL_OK, NULL},
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{TK_CONFIG_CUSTOM, "-state", NULL, NULL,
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NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},
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{TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
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NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
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{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL}
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};
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/*
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* Prototypes for functions defined in this file:
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*/
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static void ImageChangedProc(ClientData clientData,
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int x, int y, int width, int height, int imgWidth,
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int imgHeight);
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static int ImageCoords(Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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Tcl_Obj *const argv[]);
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static int ImageToArea(Tk_Canvas canvas,
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Tk_Item *itemPtr, double *rectPtr);
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static double ImageToPoint(Tk_Canvas canvas,
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Tk_Item *itemPtr, double *coordPtr);
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static int ImageToPostscript(Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
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static void ComputeImageBbox(Tk_Canvas canvas, ImageItem *imgPtr);
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static int ConfigureImage(Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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Tcl_Obj *const argv[], int flags);
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static int CreateImage(Tcl_Interp *interp,
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Tk_Canvas canvas, struct Tk_Item *itemPtr,
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int argc, Tcl_Obj *const argv[]);
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static void DeleteImage(Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display);
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static void DisplayImage(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 ScaleImage(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 TranslateImage(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 image item type in terms of functions that
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* can be invoked by generic item code.
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*/
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Tk_ItemType tkImageType = {
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"image", /* name */
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sizeof(ImageItem), /* itemSize */
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CreateImage, /* createProc */
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configSpecs, /* configSpecs */
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ConfigureImage, /* configureProc */
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ImageCoords, /* coordProc */
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DeleteImage, /* deleteProc */
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DisplayImage, /* displayProc */
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TK_CONFIG_OBJS, /* flags */
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ImageToPoint, /* pointProc */
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ImageToArea, /* areaProc */
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ImageToPostscript, /* postscriptProc */
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ScaleImage, /* scaleProc */
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TranslateImage, /* translateProc */
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NULL, /* indexProc */
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NULL, /* icursorProc */
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NULL, /* selectionProc */
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NULL, /* insertProc */
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NULL, /* dTextProc */
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NULL, /* nextPtr */
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NULL, 0, NULL, NULL
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};
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/*
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*--------------------------------------------------------------
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*
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* CreateImage --
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*
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* This function is invoked to create a new image 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 creating the
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* item, then an error message is left in the interp's result; in this
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* case itemPtr is left uninitialized, so it can be safely freed by the
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* caller.
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*
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* Side effects:
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* A new image 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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CreateImage(
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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 has been
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* initialized by caller. */
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int objc, /* Number of arguments in objv. */
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Tcl_Obj *const objv[]) /* Arguments describing rectangle. */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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int i;
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if (objc == 0) {
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Tcl_Panic("canvas did not pass any coords");
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}
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/*
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* Initialize item's record.
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*/
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imgPtr->canvas = canvas;
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imgPtr->anchor = TK_ANCHOR_CENTER;
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imgPtr->imageString = NULL;
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imgPtr->activeImageString = NULL;
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imgPtr->disabledImageString = NULL;
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imgPtr->image = NULL;
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imgPtr->activeImage = NULL;
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imgPtr->disabledImage = NULL;
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/*
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* Process the arguments to fill in the item record. Only 1 (list) or 2 (x
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* y) coords are allowed.
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*/
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if (objc == 1) {
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i = 1;
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} else {
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const char *arg = Tcl_GetString(objv[1]);
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i = 2;
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if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
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i = 1;
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}
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}
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if ((ImageCoords(interp, canvas, itemPtr, i, objv) != TCL_OK)) {
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goto error;
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}
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if (ConfigureImage(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
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return TCL_OK;
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}
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error:
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DeleteImage(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
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return TCL_ERROR;
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}
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/*
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*--------------------------------------------------------------
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*
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* ImageCoords --
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*
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* This function is invoked to process the "coords" widget command on
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* image items. See the user documentation for 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 the interp's 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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ImageCoords(
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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 read or
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* modified. */
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int objc, /* Number of coordinates supplied in objv. */
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Tcl_Obj *const objv[]) /* Array of coordinates: x1, y1, x2, y2, ... */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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if (objc == 0) {
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Tcl_Obj *objs[2];
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objs[0] = Tcl_NewDoubleObj(imgPtr->x);
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objs[1] = Tcl_NewDoubleObj(imgPtr->y);
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Tcl_SetObjResult(interp, Tcl_NewListObj(2, objs));
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} else if (objc < 3) {
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if (objc==1) {
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if (Tcl_ListObjGetElements(interp, objv[0], &objc,
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(Tcl_Obj ***) &objv) != TCL_OK) {
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return TCL_ERROR;
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} else if (objc != 2) {
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Tcl_SetObjResult(interp, Tcl_ObjPrintf(
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"wrong # coordinates: expected 2, got %d", objc));
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Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "IMAGE",
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NULL);
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return TCL_ERROR;
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}
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}
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if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],
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&imgPtr->x) != TCL_OK)
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|| (Tk_CanvasGetCoordFromObj(interp, canvas, objv[1],
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&imgPtr->y) != TCL_OK)) {
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return TCL_ERROR;
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}
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ComputeImageBbox(canvas, imgPtr);
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} else {
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Tcl_SetObjResult(interp, Tcl_ObjPrintf(
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"wrong # coordinates: expected 0 or 2, got %d", objc));
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Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "IMAGE", NULL);
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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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* ConfigureImage --
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*
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* This function is invoked to configure various aspects of an image
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* 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 an error message
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* is left in the interp's 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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ConfigureImage(
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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, /* Image item to reconfigure. */
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int objc, /* Number of elements in objv. */
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Tcl_Obj *const objv[], /* 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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ImageItem *imgPtr = (ImageItem *) itemPtr;
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Tk_Window tkwin;
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Tk_Image image;
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tkwin = Tk_CanvasTkwin(canvas);
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if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
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(const char **) objv, (char *) imgPtr, flags|TK_CONFIG_OBJS)) {
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return TCL_ERROR;
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}
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/*
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* Create the image. Save the old image around and don't free it until
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* after the new one is allocated. This keeps the reference count from
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* going to zero so the image doesn't have to be recreated if it hasn't
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* changed.
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*/
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if (imgPtr->activeImageString != NULL) {
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itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
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} else {
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itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
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}
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if (imgPtr->imageString != NULL) {
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image = Tk_GetImage(interp, tkwin, imgPtr->imageString,
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ImageChangedProc, imgPtr);
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if (image == NULL) {
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return TCL_ERROR;
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}
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} else {
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image = NULL;
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}
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if (imgPtr->image != NULL) {
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Tk_FreeImage(imgPtr->image);
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}
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imgPtr->image = image;
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if (imgPtr->activeImageString != NULL) {
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image = Tk_GetImage(interp, tkwin, imgPtr->activeImageString,
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ImageChangedProc, imgPtr);
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if (image == NULL) {
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return TCL_ERROR;
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}
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} else {
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image = NULL;
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}
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if (imgPtr->activeImage != NULL) {
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Tk_FreeImage(imgPtr->activeImage);
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}
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imgPtr->activeImage = image;
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if (imgPtr->disabledImageString != NULL) {
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image = Tk_GetImage(interp, tkwin, imgPtr->disabledImageString,
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ImageChangedProc, imgPtr);
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if (image == NULL) {
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return TCL_ERROR;
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}
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} else {
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image = NULL;
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}
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if (imgPtr->disabledImage != NULL) {
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Tk_FreeImage(imgPtr->disabledImage);
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}
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imgPtr->disabledImage = image;
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ComputeImageBbox(canvas, imgPtr);
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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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* DeleteImage --
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*
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* This function is called to clean up the data structure associated with
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* a image 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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DeleteImage(
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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 canvas. */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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if (imgPtr->imageString != NULL) {
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ckfree(imgPtr->imageString);
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}
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if (imgPtr->activeImageString != NULL) {
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ckfree(imgPtr->activeImageString);
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}
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if (imgPtr->disabledImageString != NULL) {
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ckfree(imgPtr->disabledImageString);
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}
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if (imgPtr->image != NULL) {
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Tk_FreeImage(imgPtr->image);
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}
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if (imgPtr->activeImage != NULL) {
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Tk_FreeImage(imgPtr->activeImage);
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}
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if (imgPtr->disabledImage != NULL) {
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Tk_FreeImage(imgPtr->disabledImage);
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}
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}
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/*
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*--------------------------------------------------------------
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*
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* ComputeImageBbox --
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*
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* This function is invoked to compute the bounding box of all the pixels
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* that may be drawn as part of a image item. This function is where the
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* child image's placement is 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 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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ComputeImageBbox(
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Tk_Canvas canvas, /* Canvas that contains item. */
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ImageItem *imgPtr) /* Item whose bbox is to be recomputed. */
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{
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int width, height;
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int x, y;
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Tk_Image image;
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Tk_State state = imgPtr->header.state;
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if(state == TK_STATE_NULL) {
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state = Canvas(canvas)->canvas_state;
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}
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image = imgPtr->image;
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if (Canvas(canvas)->currentItemPtr == (Tk_Item *)imgPtr) {
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if (imgPtr->activeImage != NULL) {
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image = imgPtr->activeImage;
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}
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} else if (state == TK_STATE_DISABLED) {
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if (imgPtr->disabledImage != NULL) {
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image = imgPtr->disabledImage;
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}
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}
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x = (int) (imgPtr->x + ((imgPtr->x >= 0) ? 0.5 : - 0.5));
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y = (int) (imgPtr->y + ((imgPtr->y >= 0) ? 0.5 : - 0.5));
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if ((state == TK_STATE_HIDDEN) || (image == NULL)) {
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imgPtr->header.x1 = imgPtr->header.x2 = x;
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imgPtr->header.y1 = imgPtr->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 image, using anchor information.
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*/
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Tk_SizeOfImage(image, &width, &height);
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switch (imgPtr->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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imgPtr->header.x1 = x;
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imgPtr->header.y1 = y;
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imgPtr->header.x2 = x + width;
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imgPtr->header.y2 = y + height;
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}
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/*
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*--------------------------------------------------------------
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*
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* DisplayImage --
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*
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* This function is invoked to draw a image item in a given 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 information in
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* canvas.
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*
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*--------------------------------------------------------------
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*/
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static void
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DisplayImage(
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Tk_Canvas canvas, /* Canvas that contains item. */
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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, int y, int width, int height)
|
||
/* Describes region of canvas that must be
|
||
* redisplayed (not used). */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
short drawableX, drawableY;
|
||
Tk_Image image;
|
||
Tk_State state = itemPtr->state;
|
||
|
||
if (state == TK_STATE_NULL) {
|
||
state = Canvas(canvas)->canvas_state;
|
||
}
|
||
|
||
image = imgPtr->image;
|
||
if (Canvas(canvas)->currentItemPtr == itemPtr) {
|
||
if (imgPtr->activeImage != NULL) {
|
||
image = imgPtr->activeImage;
|
||
}
|
||
} else if (state == TK_STATE_DISABLED) {
|
||
if (imgPtr->disabledImage != NULL) {
|
||
image = imgPtr->disabledImage;
|
||
}
|
||
}
|
||
|
||
if (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(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(
|
||
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 function 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(
|
||
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;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ImageToPostscript --
|
||
*
|
||
* This function is called to generate Postscript for image 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
|
||
ImageToPostscript(
|
||
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.*/
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
Tk_Window canvasWin = Tk_CanvasTkwin(canvas);
|
||
double x, y;
|
||
int width, height;
|
||
Tk_Image image;
|
||
Tk_State state = itemPtr->state;
|
||
|
||
if (state == TK_STATE_NULL) {
|
||
state = Canvas(canvas)->canvas_state;
|
||
}
|
||
|
||
image = imgPtr->image;
|
||
if (Canvas(canvas)->currentItemPtr == itemPtr) {
|
||
if (imgPtr->activeImage != NULL) {
|
||
image = imgPtr->activeImage;
|
||
}
|
||
} else if (state == TK_STATE_DISABLED) {
|
||
if (imgPtr->disabledImage != NULL) {
|
||
image = imgPtr->disabledImage;
|
||
}
|
||
}
|
||
if (image == NULL) {
|
||
/*
|
||
* Image item without actual image specified.
|
||
*/
|
||
|
||
return TCL_OK;
|
||
}
|
||
Tk_SizeOfImage(image, &width, &height);
|
||
|
||
/*
|
||
* Compute the coordinates of the lower-left corner of the image, taking
|
||
* into account the anchor position for the image.
|
||
*/
|
||
|
||
x = imgPtr->x;
|
||
y = Tk_CanvasPsY(canvas, imgPtr->y);
|
||
|
||
switch (imgPtr->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;
|
||
}
|
||
|
||
if (!prepass) {
|
||
Tcl_Obj *psObj = Tcl_GetObjResult(interp);
|
||
|
||
if (Tcl_IsShared(psObj)) {
|
||
psObj = Tcl_DuplicateObj(psObj);
|
||
Tcl_SetObjResult(interp, psObj);
|
||
}
|
||
|
||
Tcl_AppendPrintfToObj(psObj, "%.15g %.15g translate\n", x, y);
|
||
}
|
||
|
||
return Tk_PostscriptImage(image, interp, canvasWin,
|
||
((TkCanvas *) canvas)->psInfo, 0, 0, width, height, prepass);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleImage --
|
||
*
|
||
* This function 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(
|
||
Tk_Canvas canvas, /* Canvas containing rectangle. */
|
||
Tk_Item *itemPtr, /* Rectangle to be scaled. */
|
||
double originX, double 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 function 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(
|
||
Tk_Canvas canvas, /* Canvas containing item. */
|
||
Tk_Item *itemPtr, /* Item that is being moved. */
|
||
double deltaX, double deltaY)
|
||
/* Amount by which item is to be moved. */
|
||
{
|
||
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
||
|
||
imgPtr->x += deltaX;
|
||
imgPtr->y += deltaY;
|
||
ComputeImageBbox(canvas, imgPtr);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ImageChangedProc --
|
||
*
|
||
* This function 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 clientData, /* Pointer to canvas item for image. */
|
||
int x, int y, /* Upper left pixel (within image) that must
|
||
* be redisplayed. */
|
||
int width, int height, /* Dimensions of area to redisplay (may be <=
|
||
* 0). */
|
||
int imgWidth, int imgHeight)/* New dimensions of image. */
|
||
{
|
||
ImageItem *imgPtr = 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));
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* mode: c
|
||
* c-basic-offset: 4
|
||
* fill-column: 78
|
||
* End:
|
||
*/
|