682 lines
19 KiB
C
682 lines
19 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) 1994-1996 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkCanvImg.c 1.18 96/05/03 10:49:09
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*/
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#include <stdio.h>
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#include "tkInt.h"
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#include "tkPort.h"
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#include "tkCanvas.h"
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/*
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* The structure below defines the record for each 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
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* (x,y). */
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char *imageString; /* String describing -image option (malloc-ed).
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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
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* no 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 Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
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Tk_CanvasTagsPrintProc, (ClientData) NULL
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};
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static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
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"center", Tk_Offset(ImageItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
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#ifdef SCM_CODE
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{TK_CONFIG_IMAGE, "-image", (char *) NULL, (char *) NULL,
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#else
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{TK_CONFIG_STRING, "-image", (char *) NULL, (char *) NULL,
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#endif
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(char *) NULL, Tk_Offset(ImageItem, imageString), TK_CONFIG_NULL_OK},
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{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
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(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) NULL, 0, 0}
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};
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/*
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* Prototypes for procedures defined in this file:
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*/
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static void ImageChangedProc _ANSI_ARGS_((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 _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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char **argv));
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static int ImageToArea _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double *rectPtr));
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static double ImageToPoint _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double *coordPtr));
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static void ComputeImageBbox _ANSI_ARGS_((Tk_Canvas canvas,
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ImageItem *imgPtr));
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static int ConfigureImage _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
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char **argv, int flags));
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static int CreateImage _ANSI_ARGS_((Tcl_Interp *interp,
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Tk_Canvas canvas, struct Tk_Item *itemPtr,
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int argc, char **argv));
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static void DeleteImage _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display));
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static void DisplayImage _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, Display *display, Drawable dst,
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int x, int y, int width, int height));
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static void ScaleImage _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double originX, double originY,
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double scaleX, double scaleY));
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static void TranslateImage _ANSI_ARGS_((Tk_Canvas canvas,
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Tk_Item *itemPtr, double deltaX, double deltaY));
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/*
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* The structures below defines the image item type in terms of
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* procedures that can be invoked by generic item code.
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*/
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Tk_ItemType 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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0, /* alwaysRedraw */
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ImageToPoint, /* pointProc */
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ImageToArea, /* areaProc */
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(Tk_ItemPostscriptProc *) NULL, /* postscriptProc */
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ScaleImage, /* scaleProc */
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TranslateImage, /* translateProc */
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(Tk_ItemIndexProc *) NULL, /* indexProc */
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(Tk_ItemCursorProc *) NULL, /* icursorProc */
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(Tk_ItemSelectionProc *) NULL, /* selectionProc */
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(Tk_ItemInsertProc *) NULL, /* insertProc */
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(Tk_ItemDCharsProc *) NULL, /* dTextProc */
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(Tk_ItemType *) NULL /* nextPtr */
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};
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/*
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*--------------------------------------------------------------
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*
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* CreateImage --
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*
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* This procedure is invoked to create a new image
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* item in a canvas.
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*
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* Results:
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* A standard Tcl return value. If an error occurred in
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* creating the item, then an error message is left in
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* interp->result; in this case itemPtr is left uninitialized,
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* so it can be safely freed by the caller.
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*
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* Side effects:
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* A new 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(interp, canvas, itemPtr, argc, argv)
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Tcl_Interp *interp; /* Interpreter for error reporting. */
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Tk_Canvas canvas; /* Canvas to hold new item. */
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Tk_Item *itemPtr; /* Record to hold new item; header
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* has been initialized by caller. */
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int argc; /* Number of arguments in argv. */
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char **argv; /* Arguments describing rectangle. */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
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itemPtr->typePtr->name, " x y ?options?\"",
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(char *) NULL);
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return TCL_ERROR;
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}
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/*
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* Initialize item's record.
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*/
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imgPtr->canvas = canvas;
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imgPtr->anchor = TK_ANCHOR_CENTER;
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imgPtr->imageString = NULL;
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imgPtr->image = NULL;
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/*
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* Process the arguments to fill in the item record.
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*/
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if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &imgPtr->x) != TCL_OK)
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|| (Tk_CanvasGetCoord(interp, canvas, argv[1], &imgPtr->y)
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!= TCL_OK)) {
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return TCL_ERROR;
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}
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if (ConfigureImage(interp, canvas, itemPtr, argc-2, argv+2, 0) != TCL_OK) {
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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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return TCL_OK;
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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 procedure is invoked to process the "coords" widget
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* command on image items. See the user documentation for
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* details on what it does.
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*
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* Results:
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* Returns TCL_OK or TCL_ERROR, and sets interp->result.
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*
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* Side effects:
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* The coordinates for the given item may be changed.
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*
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*--------------------------------------------------------------
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*/
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static int
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ImageCoords(interp, canvas, itemPtr, argc, argv)
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Tcl_Interp *interp; /* Used for error reporting. */
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Tk_Canvas canvas; /* Canvas containing item. */
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Tk_Item *itemPtr; /* Item whose coordinates are to be
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* read or modified. */
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int argc; /* Number of coordinates supplied in
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* argv. */
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char **argv; /* Array of coordinates: x1, y1,
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* x2, y2, ... */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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char x[TCL_DOUBLE_SPACE], y[TCL_DOUBLE_SPACE];
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if (argc == 0) {
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Tcl_PrintDouble(interp, imgPtr->x, x);
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Tcl_PrintDouble(interp, imgPtr->y, y);
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Tcl_AppendResult(interp, x, " ", y, (char *) NULL);
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} else if (argc == 2) {
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if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &imgPtr->x) != TCL_OK)
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|| (Tk_CanvasGetCoord(interp, canvas, argv[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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sprintf(interp->result,
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"wrong # coordinates: expected 0 or 2, got %d", argc);
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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*--------------------------------------------------------------
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*
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* ConfigureImage --
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*
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* This procedure is invoked to configure various aspects
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* of an image item, such as its anchor position.
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*
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* Results:
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* A standard Tcl result code. If an error occurs, then
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* an error message is left in interp->result.
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*
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* Side effects:
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* Configuration information may be set for itemPtr.
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*
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*--------------------------------------------------------------
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*/
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static int
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ConfigureImage(interp, canvas, itemPtr, argc, argv, flags)
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Tcl_Interp *interp; /* Used for error reporting. */
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Tk_Canvas canvas; /* Canvas containing itemPtr. */
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Tk_Item *itemPtr; /* Image item to reconfigure. */
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int argc; /* Number of elements in argv. */
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char **argv; /* Arguments describing things to configure. */
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int flags; /* Flags to pass to Tk_ConfigureWidget. */
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{
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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 (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc,
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argv, (char *) imgPtr, flags) != TCL_OK) {
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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
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* until after the new one is allocated. This keeps the reference
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* count from going to zero so the image doesn't have to be recreated
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* if it hasn't changed.
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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, (ClientData) 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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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 procedure is called to clean up the data structure
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* associated with 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(canvas, itemPtr, display)
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Tk_Canvas canvas; /* Info about overall canvas widget. */
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Tk_Item *itemPtr; /* Item that is being deleted. */
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Display *display; /* Display containing window for
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* canvas. */
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{
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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->image != NULL) {
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Tk_FreeImage(imgPtr->image);
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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 procedure is invoked to compute the bounding box of
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* all the pixels that may be drawn as part of a image item.
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* This procedure is where the child image's placement is
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* computed.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The fields x1, y1, x2, and y2 are updated in the header
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* for itemPtr.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static void
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ComputeImageBbox(canvas, imgPtr)
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Tk_Canvas canvas; /* Canvas that contains item. */
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ImageItem *imgPtr; /* Item whose bbox is to be
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* recomputed. */
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{
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int width, height;
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int x, y;
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x = (int) (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 (imgPtr->image == None) {
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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(imgPtr->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 procedure is invoked to draw a image item in a given
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* drawable.
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*
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* Results:
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* None.
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*
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* Side effects:
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* ItemPtr is drawn in drawable using the transformation
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* information in canvas.
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*
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*--------------------------------------------------------------
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*/
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static void
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DisplayImage(canvas, itemPtr, display, drawable, x, y, width, height)
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Tk_Canvas canvas; /* Canvas that contains item. */
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Tk_Item *itemPtr; /* Item to be displayed. */
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Display *display; /* Display on which to draw item. */
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Drawable drawable; /* Pixmap or window in which to draw
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* item. */
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int x, y, width, height; /* Describes region of canvas that
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* must be redisplayed (not used). */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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short drawableX, drawableY;
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if (imgPtr->image == NULL) {
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return;
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}
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/*
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* Translate the coordinates to those of the image, then redisplay it.
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*/
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Tk_CanvasDrawableCoords(canvas, (double) x, (double) y,
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&drawableX, &drawableY);
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Tk_RedrawImage(imgPtr->image, x - imgPtr->header.x1, y - imgPtr->header.y1,
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width, height, drawable, drawableX, drawableY);
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}
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/*
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*--------------------------------------------------------------
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*
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* ImageToPoint --
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*
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* Computes the distance from a given point to a given
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* rectangle, in canvas units.
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*
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* Results:
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* The return value is 0 if the point whose x and y coordinates
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* are coordPtr[0] and coordPtr[1] is inside the image. If the
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* point isn't inside the image then the return value is the
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* distance from the point to the image.
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*
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* Side effects:
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* None.
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*
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*--------------------------------------------------------------
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*/
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static double
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ImageToPoint(canvas, itemPtr, coordPtr)
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Tk_Canvas canvas; /* Canvas containing item. */
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Tk_Item *itemPtr; /* Item to check against point. */
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double *coordPtr; /* Pointer to x and y coordinates. */
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{
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ImageItem *imgPtr = (ImageItem *) itemPtr;
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double x1, x2, y1, y2, xDiff, yDiff;
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x1 = imgPtr->header.x1;
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y1 = imgPtr->header.y1;
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x2 = imgPtr->header.x2;
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y2 = imgPtr->header.y2;
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/*
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* Point is outside rectangle.
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*/
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if (coordPtr[0] < x1) {
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xDiff = x1 - coordPtr[0];
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} else if (coordPtr[0] > x2) {
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xDiff = coordPtr[0] - x2;
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} else {
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xDiff = 0;
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}
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if (coordPtr[1] < y1) {
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yDiff = y1 - coordPtr[1];
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} else if (coordPtr[1] > y2) {
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yDiff = coordPtr[1] - y2;
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} else {
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yDiff = 0;
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}
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return hypot(xDiff, yDiff);
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}
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/*
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*--------------------------------------------------------------
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*
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* ImageToArea --
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*
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* This procedure is called to determine whether an item
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* lies entirely inside, entirely outside, or overlapping
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* a given rectangle.
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*
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* Results:
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* -1 is returned if the item is entirely outside the area
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* given by rectPtr, 0 if it overlaps, and 1 if it is entirely
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* inside the given area.
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*
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* Side effects:
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* None.
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||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
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));
|
||
}
|