1 |
/* $Header$ */
|
2 |
|
3 |
/*
|
4 |
* tkCanvImg.c --
|
5 |
*
|
6 |
* This file implements image items for canvas widgets.
|
7 |
*
|
8 |
* Copyright (c) 1994 The Regents of the University of California.
|
9 |
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
|
10 |
*
|
11 |
* See the file "license.terms" for information on usage and redistribution
|
12 |
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
13 |
*
|
14 |
* RCS: @(#) $Id: tkcanvimg.c,v 1.1.1.1 2001/06/13 04:56:24 dtashley Exp $
|
15 |
*/
|
16 |
|
17 |
#include <stdio.h>
|
18 |
#include "tkInt.h"
|
19 |
#include "tkPort.h"
|
20 |
#include "tkCanvas.h"
|
21 |
|
22 |
/*
|
23 |
* The structure below defines the record for each image item.
|
24 |
*/
|
25 |
|
26 |
typedef struct ImageItem {
|
27 |
Tk_Item header; /* Generic stuff that's the same for all
|
28 |
* types. MUST BE FIRST IN STRUCTURE. */
|
29 |
Tk_Canvas canvas; /* Canvas containing the image. */
|
30 |
double x, y; /* Coordinates of positioning point for
|
31 |
* image. */
|
32 |
Tk_Anchor anchor; /* Where to anchor image relative to
|
33 |
* (x,y). */
|
34 |
char *imageString; /* String describing -image option (malloc-ed).
|
35 |
* NULL means no image right now. */
|
36 |
char *activeImageString; /* String describing -activeimage option.
|
37 |
* NULL means no image right now. */
|
38 |
char *disabledImageString; /* String describing -disabledimage option.
|
39 |
* NULL means no image right now. */
|
40 |
Tk_Image image; /* Image to display in window, or NULL if
|
41 |
* no image at present. */
|
42 |
Tk_Image activeImage; /* Image to display in window, or NULL if
|
43 |
* no image at present. */
|
44 |
Tk_Image disabledImage; /* Image to display in window, or NULL if
|
45 |
* no image at present. */
|
46 |
} ImageItem;
|
47 |
|
48 |
/*
|
49 |
* Information used for parsing configuration specs:
|
50 |
*/
|
51 |
|
52 |
static Tk_CustomOption stateOption = {
|
53 |
(Tk_OptionParseProc *) TkStateParseProc,
|
54 |
TkStatePrintProc, (ClientData) 2
|
55 |
};
|
56 |
static Tk_CustomOption tagsOption = {
|
57 |
(Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
|
58 |
Tk_CanvasTagsPrintProc, (ClientData) NULL
|
59 |
};
|
60 |
|
61 |
static Tk_ConfigSpec configSpecs[] = {
|
62 |
{TK_CONFIG_STRING, "-activeimage", (char *) NULL, (char *) NULL,
|
63 |
(char *) NULL, Tk_Offset(ImageItem, activeImageString),
|
64 |
TK_CONFIG_NULL_OK},
|
65 |
{TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
|
66 |
"center", Tk_Offset(ImageItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
|
67 |
{TK_CONFIG_STRING, "-disabledimage", (char *) NULL, (char *) NULL,
|
68 |
(char *) NULL, Tk_Offset(ImageItem, disabledImageString),
|
69 |
TK_CONFIG_NULL_OK},
|
70 |
{TK_CONFIG_STRING, "-image", (char *) NULL, (char *) NULL,
|
71 |
(char *) NULL, Tk_Offset(ImageItem, imageString), TK_CONFIG_NULL_OK},
|
72 |
{TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
|
73 |
(char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
|
74 |
&stateOption},
|
75 |
{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
|
76 |
(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
|
77 |
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
|
78 |
(char *) NULL, 0, 0}
|
79 |
};
|
80 |
|
81 |
/*
|
82 |
* Prototypes for procedures defined in this file:
|
83 |
*/
|
84 |
|
85 |
static void ImageChangedProc _ANSI_ARGS_((ClientData clientData,
|
86 |
int x, int y, int width, int height, int imgWidth,
|
87 |
int imgHeight));
|
88 |
static int ImageCoords _ANSI_ARGS_((Tcl_Interp *interp,
|
89 |
Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
|
90 |
Tcl_Obj *CONST argv[]));
|
91 |
static int ImageToArea _ANSI_ARGS_((Tk_Canvas canvas,
|
92 |
Tk_Item *itemPtr, double *rectPtr));
|
93 |
static double ImageToPoint _ANSI_ARGS_((Tk_Canvas canvas,
|
94 |
Tk_Item *itemPtr, double *coordPtr));
|
95 |
static int ImageToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
|
96 |
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
|
97 |
static void ComputeImageBbox _ANSI_ARGS_((Tk_Canvas canvas,
|
98 |
ImageItem *imgPtr));
|
99 |
static int ConfigureImage _ANSI_ARGS_((Tcl_Interp *interp,
|
100 |
Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
|
101 |
Tcl_Obj *CONST argv[], int flags));
|
102 |
static int CreateImage _ANSI_ARGS_((Tcl_Interp *interp,
|
103 |
Tk_Canvas canvas, struct Tk_Item *itemPtr,
|
104 |
int argc, Tcl_Obj *CONST argv[]));
|
105 |
static void DeleteImage _ANSI_ARGS_((Tk_Canvas canvas,
|
106 |
Tk_Item *itemPtr, Display *display));
|
107 |
static void DisplayImage _ANSI_ARGS_((Tk_Canvas canvas,
|
108 |
Tk_Item *itemPtr, Display *display, Drawable dst,
|
109 |
int x, int y, int width, int height));
|
110 |
static void ScaleImage _ANSI_ARGS_((Tk_Canvas canvas,
|
111 |
Tk_Item *itemPtr, double originX, double originY,
|
112 |
double scaleX, double scaleY));
|
113 |
static void TranslateImage _ANSI_ARGS_((Tk_Canvas canvas,
|
114 |
Tk_Item *itemPtr, double deltaX, double deltaY));
|
115 |
|
116 |
/*
|
117 |
* The structures below defines the image item type in terms of
|
118 |
* procedures that can be invoked by generic item code.
|
119 |
*/
|
120 |
|
121 |
Tk_ItemType tkImageType = {
|
122 |
"image", /* name */
|
123 |
sizeof(ImageItem), /* itemSize */
|
124 |
CreateImage, /* createProc */
|
125 |
configSpecs, /* configSpecs */
|
126 |
ConfigureImage, /* configureProc */
|
127 |
ImageCoords, /* coordProc */
|
128 |
DeleteImage, /* deleteProc */
|
129 |
DisplayImage, /* displayProc */
|
130 |
TK_CONFIG_OBJS, /* flags */
|
131 |
ImageToPoint, /* pointProc */
|
132 |
ImageToArea, /* areaProc */
|
133 |
ImageToPostscript, /* postscriptProc */
|
134 |
ScaleImage, /* scaleProc */
|
135 |
TranslateImage, /* translateProc */
|
136 |
(Tk_ItemIndexProc *) NULL, /* indexProc */
|
137 |
(Tk_ItemCursorProc *) NULL, /* icursorProc */
|
138 |
(Tk_ItemSelectionProc *) NULL, /* selectionProc */
|
139 |
(Tk_ItemInsertProc *) NULL, /* insertProc */
|
140 |
(Tk_ItemDCharsProc *) NULL, /* dTextProc */
|
141 |
(Tk_ItemType *) NULL, /* nextPtr */
|
142 |
};
|
143 |
|
144 |
/*
|
145 |
*--------------------------------------------------------------
|
146 |
*
|
147 |
* CreateImage --
|
148 |
*
|
149 |
* This procedure is invoked to create a new image
|
150 |
* item in a canvas.
|
151 |
*
|
152 |
* Results:
|
153 |
* A standard Tcl return value. If an error occurred in
|
154 |
* creating the item, then an error message is left in
|
155 |
* the interp's result; in this case itemPtr is left uninitialized,
|
156 |
* so it can be safely freed by the caller.
|
157 |
*
|
158 |
* Side effects:
|
159 |
* A new image item is created.
|
160 |
*
|
161 |
*--------------------------------------------------------------
|
162 |
*/
|
163 |
|
164 |
static int
|
165 |
CreateImage(interp, canvas, itemPtr, argc, argv)
|
166 |
Tcl_Interp *interp; /* Interpreter for error reporting. */
|
167 |
Tk_Canvas canvas; /* Canvas to hold new item. */
|
168 |
Tk_Item *itemPtr; /* Record to hold new item; header
|
169 |
* has been initialized by caller. */
|
170 |
int argc; /* Number of arguments in argv. */
|
171 |
Tcl_Obj *CONST argv[]; /* Arguments describing rectangle. */
|
172 |
{
|
173 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
174 |
int i;
|
175 |
|
176 |
if (argc==1) {
|
177 |
i = 1;
|
178 |
} else {
|
179 |
char *arg = Tcl_GetStringFromObj((Tcl_Obj *) argv[1], NULL);
|
180 |
if (((argc>1) && (arg[0] == '-')
|
181 |
&& (arg[1] >= 'a') && (arg[1] <= 'z'))) {
|
182 |
i = 1;
|
183 |
} else {
|
184 |
i = 2;
|
185 |
}
|
186 |
}
|
187 |
|
188 |
if (argc < i) {
|
189 |
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
190 |
Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
|
191 |
itemPtr->typePtr->name, " x y ?options?\"",
|
192 |
(char *) NULL);
|
193 |
return TCL_ERROR;
|
194 |
}
|
195 |
|
196 |
/*
|
197 |
* Initialize item's record.
|
198 |
*/
|
199 |
|
200 |
imgPtr->canvas = canvas;
|
201 |
imgPtr->anchor = TK_ANCHOR_CENTER;
|
202 |
imgPtr->imageString = NULL;
|
203 |
imgPtr->activeImageString = NULL;
|
204 |
imgPtr->disabledImageString = NULL;
|
205 |
imgPtr->image = NULL;
|
206 |
imgPtr->activeImage = NULL;
|
207 |
imgPtr->disabledImage = NULL;
|
208 |
|
209 |
/*
|
210 |
* Process the arguments to fill in the item record.
|
211 |
*/
|
212 |
|
213 |
if ((ImageCoords(interp, canvas, itemPtr, i, argv) != TCL_OK)) {
|
214 |
goto error;
|
215 |
}
|
216 |
if (ConfigureImage(interp, canvas, itemPtr, argc-i, argv+i, 0) == TCL_OK) {
|
217 |
return TCL_OK;
|
218 |
}
|
219 |
|
220 |
error:
|
221 |
DeleteImage(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
|
222 |
return TCL_ERROR;
|
223 |
}
|
224 |
|
225 |
/*
|
226 |
*--------------------------------------------------------------
|
227 |
*
|
228 |
* ImageCoords --
|
229 |
*
|
230 |
* This procedure is invoked to process the "coords" widget
|
231 |
* command on image items. See the user documentation for
|
232 |
* details on what it does.
|
233 |
*
|
234 |
* Results:
|
235 |
* Returns TCL_OK or TCL_ERROR, and sets the interp's result.
|
236 |
*
|
237 |
* Side effects:
|
238 |
* The coordinates for the given item may be changed.
|
239 |
*
|
240 |
*--------------------------------------------------------------
|
241 |
*/
|
242 |
|
243 |
static int
|
244 |
ImageCoords(interp, canvas, itemPtr, argc, argv)
|
245 |
Tcl_Interp *interp; /* Used for error reporting. */
|
246 |
Tk_Canvas canvas; /* Canvas containing item. */
|
247 |
Tk_Item *itemPtr; /* Item whose coordinates are to be
|
248 |
* read or modified. */
|
249 |
int argc; /* Number of coordinates supplied in
|
250 |
* argv. */
|
251 |
Tcl_Obj *CONST argv[]; /* Array of coordinates: x1, y1,
|
252 |
* x2, y2, ... */
|
253 |
{
|
254 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
255 |
|
256 |
if (argc == 0) {
|
257 |
Tcl_Obj *obj = Tcl_NewObj();
|
258 |
Tcl_Obj *subobj = Tcl_NewDoubleObj(imgPtr->x);
|
259 |
Tcl_ListObjAppendElement(interp, obj, subobj);
|
260 |
subobj = Tcl_NewDoubleObj(imgPtr->y);
|
261 |
Tcl_ListObjAppendElement(interp, obj, subobj);
|
262 |
Tcl_SetObjResult(interp, obj);
|
263 |
} else if (argc < 3) {
|
264 |
if (argc==1) {
|
265 |
if (Tcl_ListObjGetElements(interp, argv[0], &argc,
|
266 |
(Tcl_Obj ***) &argv) != TCL_OK) {
|
267 |
return TCL_ERROR;
|
268 |
} else if (argc != 2) {
|
269 |
char buf[64];
|
270 |
|
271 |
sprintf(buf, "wrong # coordinates: expected 2, got %d", argc);
|
272 |
Tcl_SetResult(interp, buf, TCL_VOLATILE);
|
273 |
return TCL_ERROR;
|
274 |
}
|
275 |
}
|
276 |
if ((Tk_CanvasGetCoordFromObj(interp, canvas, argv[0], &imgPtr->x) != TCL_OK)
|
277 |
|| (Tk_CanvasGetCoordFromObj(interp, canvas, argv[1],
|
278 |
&imgPtr->y) != TCL_OK)) {
|
279 |
return TCL_ERROR;
|
280 |
}
|
281 |
ComputeImageBbox(canvas, imgPtr);
|
282 |
} else {
|
283 |
char buf[64];
|
284 |
|
285 |
sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", argc);
|
286 |
Tcl_SetResult(interp, buf, TCL_VOLATILE);
|
287 |
return TCL_ERROR;
|
288 |
}
|
289 |
return TCL_OK;
|
290 |
}
|
291 |
|
292 |
/*
|
293 |
*--------------------------------------------------------------
|
294 |
*
|
295 |
* ConfigureImage --
|
296 |
*
|
297 |
* This procedure is invoked to configure various aspects
|
298 |
* of an image item, such as its anchor position.
|
299 |
*
|
300 |
* Results:
|
301 |
* A standard Tcl result code. If an error occurs, then
|
302 |
* an error message is left in the interp's result.
|
303 |
*
|
304 |
* Side effects:
|
305 |
* Configuration information may be set for itemPtr.
|
306 |
*
|
307 |
*--------------------------------------------------------------
|
308 |
*/
|
309 |
|
310 |
static int
|
311 |
ConfigureImage(interp, canvas, itemPtr, argc, argv, flags)
|
312 |
Tcl_Interp *interp; /* Used for error reporting. */
|
313 |
Tk_Canvas canvas; /* Canvas containing itemPtr. */
|
314 |
Tk_Item *itemPtr; /* Image item to reconfigure. */
|
315 |
int argc; /* Number of elements in argv. */
|
316 |
Tcl_Obj *CONST argv[]; /* Arguments describing things to configure. */
|
317 |
int flags; /* Flags to pass to Tk_ConfigureWidget. */
|
318 |
{
|
319 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
320 |
Tk_Window tkwin;
|
321 |
Tk_Image image;
|
322 |
|
323 |
tkwin = Tk_CanvasTkwin(canvas);
|
324 |
if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, (char **) argv,
|
325 |
(char *) imgPtr, flags|TK_CONFIG_OBJS) != TCL_OK) {
|
326 |
return TCL_ERROR;
|
327 |
}
|
328 |
|
329 |
/*
|
330 |
* Create the image. Save the old image around and don't free it
|
331 |
* until after the new one is allocated. This keeps the reference
|
332 |
* count from going to zero so the image doesn't have to be recreated
|
333 |
* if it hasn't changed.
|
334 |
*/
|
335 |
|
336 |
if (imgPtr->activeImageString != NULL) {
|
337 |
itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
|
338 |
} else {
|
339 |
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
|
340 |
}
|
341 |
if (imgPtr->imageString != NULL) {
|
342 |
image = Tk_GetImage(interp, tkwin, imgPtr->imageString,
|
343 |
ImageChangedProc, (ClientData) imgPtr);
|
344 |
if (image == NULL) {
|
345 |
return TCL_ERROR;
|
346 |
}
|
347 |
} else {
|
348 |
image = NULL;
|
349 |
}
|
350 |
if (imgPtr->image != NULL) {
|
351 |
Tk_FreeImage(imgPtr->image);
|
352 |
}
|
353 |
imgPtr->image = image;
|
354 |
if (imgPtr->activeImageString != NULL) {
|
355 |
image = Tk_GetImage(interp, tkwin, imgPtr->activeImageString,
|
356 |
ImageChangedProc, (ClientData) imgPtr);
|
357 |
if (image == NULL) {
|
358 |
return TCL_ERROR;
|
359 |
}
|
360 |
} else {
|
361 |
image = NULL;
|
362 |
}
|
363 |
if (imgPtr->activeImage != NULL) {
|
364 |
Tk_FreeImage(imgPtr->activeImage);
|
365 |
}
|
366 |
imgPtr->activeImage = image;
|
367 |
if (imgPtr->disabledImageString != NULL) {
|
368 |
image = Tk_GetImage(interp, tkwin, imgPtr->disabledImageString,
|
369 |
ImageChangedProc, (ClientData) imgPtr);
|
370 |
if (image == NULL) {
|
371 |
return TCL_ERROR;
|
372 |
}
|
373 |
} else {
|
374 |
image = NULL;
|
375 |
}
|
376 |
if (imgPtr->disabledImage != NULL) {
|
377 |
Tk_FreeImage(imgPtr->disabledImage);
|
378 |
}
|
379 |
imgPtr->disabledImage = image;
|
380 |
ComputeImageBbox(canvas, imgPtr);
|
381 |
return TCL_OK;
|
382 |
}
|
383 |
|
384 |
/*
|
385 |
*--------------------------------------------------------------
|
386 |
*
|
387 |
* DeleteImage --
|
388 |
*
|
389 |
* This procedure is called to clean up the data structure
|
390 |
* associated with a image item.
|
391 |
*
|
392 |
* Results:
|
393 |
* None.
|
394 |
*
|
395 |
* Side effects:
|
396 |
* Resources associated with itemPtr are released.
|
397 |
*
|
398 |
*--------------------------------------------------------------
|
399 |
*/
|
400 |
|
401 |
static void
|
402 |
DeleteImage(canvas, itemPtr, display)
|
403 |
Tk_Canvas canvas; /* Info about overall canvas widget. */
|
404 |
Tk_Item *itemPtr; /* Item that is being deleted. */
|
405 |
Display *display; /* Display containing window for
|
406 |
* canvas. */
|
407 |
{
|
408 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
409 |
|
410 |
if (imgPtr->imageString != NULL) {
|
411 |
ckfree(imgPtr->imageString);
|
412 |
}
|
413 |
if (imgPtr->activeImageString != NULL) {
|
414 |
ckfree(imgPtr->activeImageString);
|
415 |
}
|
416 |
if (imgPtr->disabledImageString != NULL) {
|
417 |
ckfree(imgPtr->disabledImageString);
|
418 |
}
|
419 |
if (imgPtr->image != NULL) {
|
420 |
Tk_FreeImage(imgPtr->image);
|
421 |
}
|
422 |
if (imgPtr->activeImage != NULL) {
|
423 |
Tk_FreeImage(imgPtr->activeImage);
|
424 |
}
|
425 |
if (imgPtr->disabledImage != NULL) {
|
426 |
Tk_FreeImage(imgPtr->disabledImage);
|
427 |
}
|
428 |
}
|
429 |
|
430 |
/*
|
431 |
*--------------------------------------------------------------
|
432 |
*
|
433 |
* ComputeImageBbox --
|
434 |
*
|
435 |
* This procedure is invoked to compute the bounding box of
|
436 |
* all the pixels that may be drawn as part of a image item.
|
437 |
* This procedure is where the child image's placement is
|
438 |
* computed.
|
439 |
*
|
440 |
* Results:
|
441 |
* None.
|
442 |
*
|
443 |
* Side effects:
|
444 |
* The fields x1, y1, x2, and y2 are updated in the header
|
445 |
* for itemPtr.
|
446 |
*
|
447 |
*--------------------------------------------------------------
|
448 |
*/
|
449 |
|
450 |
/* ARGSUSED */
|
451 |
static void
|
452 |
ComputeImageBbox(canvas, imgPtr)
|
453 |
Tk_Canvas canvas; /* Canvas that contains item. */
|
454 |
ImageItem *imgPtr; /* Item whose bbox is to be
|
455 |
* recomputed. */
|
456 |
{
|
457 |
int width, height;
|
458 |
int x, y;
|
459 |
Tk_Image image;
|
460 |
Tk_State state = imgPtr->header.state;
|
461 |
|
462 |
if(state == TK_STATE_NULL) {
|
463 |
state = ((TkCanvas *)canvas)->canvas_state;
|
464 |
}
|
465 |
image = imgPtr->image;
|
466 |
if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)imgPtr) {
|
467 |
if (imgPtr->activeImage != NULL) {
|
468 |
image = imgPtr->activeImage;
|
469 |
}
|
470 |
} else if (state == TK_STATE_DISABLED) {
|
471 |
if (imgPtr->disabledImage != NULL) {
|
472 |
image = imgPtr->disabledImage;
|
473 |
}
|
474 |
}
|
475 |
|
476 |
x = (int) (imgPtr->x + ((imgPtr->x >= 0) ? 0.5 : - 0.5));
|
477 |
y = (int) (imgPtr->y + ((imgPtr->y >= 0) ? 0.5 : - 0.5));
|
478 |
|
479 |
if ((state == TK_STATE_HIDDEN) || (image == None)) {
|
480 |
imgPtr->header.x1 = imgPtr->header.x2 = x;
|
481 |
imgPtr->header.y1 = imgPtr->header.y2 = y;
|
482 |
return;
|
483 |
}
|
484 |
|
485 |
/*
|
486 |
* Compute location and size of image, using anchor information.
|
487 |
*/
|
488 |
|
489 |
Tk_SizeOfImage(image, &width, &height);
|
490 |
switch (imgPtr->anchor) {
|
491 |
case TK_ANCHOR_N:
|
492 |
x -= width/2;
|
493 |
break;
|
494 |
case TK_ANCHOR_NE:
|
495 |
x -= width;
|
496 |
break;
|
497 |
case TK_ANCHOR_E:
|
498 |
x -= width;
|
499 |
y -= height/2;
|
500 |
break;
|
501 |
case TK_ANCHOR_SE:
|
502 |
x -= width;
|
503 |
y -= height;
|
504 |
break;
|
505 |
case TK_ANCHOR_S:
|
506 |
x -= width/2;
|
507 |
y -= height;
|
508 |
break;
|
509 |
case TK_ANCHOR_SW:
|
510 |
y -= height;
|
511 |
break;
|
512 |
case TK_ANCHOR_W:
|
513 |
y -= height/2;
|
514 |
break;
|
515 |
case TK_ANCHOR_NW:
|
516 |
break;
|
517 |
case TK_ANCHOR_CENTER:
|
518 |
x -= width/2;
|
519 |
y -= height/2;
|
520 |
break;
|
521 |
}
|
522 |
|
523 |
/*
|
524 |
* Store the information in the item header.
|
525 |
*/
|
526 |
|
527 |
imgPtr->header.x1 = x;
|
528 |
imgPtr->header.y1 = y;
|
529 |
imgPtr->header.x2 = x + width;
|
530 |
imgPtr->header.y2 = y + height;
|
531 |
}
|
532 |
|
533 |
/*
|
534 |
*--------------------------------------------------------------
|
535 |
*
|
536 |
* DisplayImage --
|
537 |
*
|
538 |
* This procedure is invoked to draw a image item in a given
|
539 |
* drawable.
|
540 |
*
|
541 |
* Results:
|
542 |
* None.
|
543 |
*
|
544 |
* Side effects:
|
545 |
* ItemPtr is drawn in drawable using the transformation
|
546 |
* information in canvas.
|
547 |
*
|
548 |
*--------------------------------------------------------------
|
549 |
*/
|
550 |
|
551 |
static void
|
552 |
DisplayImage(canvas, itemPtr, display, drawable, x, y, width, height)
|
553 |
Tk_Canvas canvas; /* Canvas that contains item. */
|
554 |
Tk_Item *itemPtr; /* Item to be displayed. */
|
555 |
Display *display; /* Display on which to draw item. */
|
556 |
Drawable drawable; /* Pixmap or window in which to draw
|
557 |
* item. */
|
558 |
int x, y, width, height; /* Describes region of canvas that
|
559 |
* must be redisplayed (not used). */
|
560 |
{
|
561 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
562 |
short drawableX, drawableY;
|
563 |
Tk_Image image;
|
564 |
Tk_State state = itemPtr->state;
|
565 |
|
566 |
if(state == TK_STATE_NULL) {
|
567 |
state = ((TkCanvas *)canvas)->canvas_state;
|
568 |
}
|
569 |
|
570 |
image = imgPtr->image;
|
571 |
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
|
572 |
if (imgPtr->activeImage != NULL) {
|
573 |
image = imgPtr->activeImage;
|
574 |
}
|
575 |
} else if (state == TK_STATE_DISABLED) {
|
576 |
if (imgPtr->disabledImage != NULL) {
|
577 |
image = imgPtr->disabledImage;
|
578 |
}
|
579 |
}
|
580 |
|
581 |
if (image == NULL) {
|
582 |
return;
|
583 |
}
|
584 |
|
585 |
/*
|
586 |
* Translate the coordinates to those of the image, then redisplay it.
|
587 |
*/
|
588 |
|
589 |
Tk_CanvasDrawableCoords(canvas, (double) x, (double) y,
|
590 |
&drawableX, &drawableY);
|
591 |
Tk_RedrawImage(image, x - imgPtr->header.x1, y - imgPtr->header.y1,
|
592 |
width, height, drawable, drawableX, drawableY);
|
593 |
}
|
594 |
|
595 |
/*
|
596 |
*--------------------------------------------------------------
|
597 |
*
|
598 |
* ImageToPoint --
|
599 |
*
|
600 |
* Computes the distance from a given point to a given
|
601 |
* rectangle, in canvas units.
|
602 |
*
|
603 |
* Results:
|
604 |
* The return value is 0 if the point whose x and y coordinates
|
605 |
* are coordPtr[0] and coordPtr[1] is inside the image. If the
|
606 |
* point isn't inside the image then the return value is the
|
607 |
* distance from the point to the image.
|
608 |
*
|
609 |
* Side effects:
|
610 |
* None.
|
611 |
*
|
612 |
*--------------------------------------------------------------
|
613 |
*/
|
614 |
|
615 |
static double
|
616 |
ImageToPoint(canvas, itemPtr, coordPtr)
|
617 |
Tk_Canvas canvas; /* Canvas containing item. */
|
618 |
Tk_Item *itemPtr; /* Item to check against point. */
|
619 |
double *coordPtr; /* Pointer to x and y coordinates. */
|
620 |
{
|
621 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
622 |
double x1, x2, y1, y2, xDiff, yDiff;
|
623 |
|
624 |
x1 = imgPtr->header.x1;
|
625 |
y1 = imgPtr->header.y1;
|
626 |
x2 = imgPtr->header.x2;
|
627 |
y2 = imgPtr->header.y2;
|
628 |
|
629 |
/*
|
630 |
* Point is outside rectangle.
|
631 |
*/
|
632 |
|
633 |
if (coordPtr[0] < x1) {
|
634 |
xDiff = x1 - coordPtr[0];
|
635 |
} else if (coordPtr[0] > x2) {
|
636 |
xDiff = coordPtr[0] - x2;
|
637 |
} else {
|
638 |
xDiff = 0;
|
639 |
}
|
640 |
|
641 |
if (coordPtr[1] < y1) {
|
642 |
yDiff = y1 - coordPtr[1];
|
643 |
} else if (coordPtr[1] > y2) {
|
644 |
yDiff = coordPtr[1] - y2;
|
645 |
} else {
|
646 |
yDiff = 0;
|
647 |
}
|
648 |
|
649 |
return hypot(xDiff, yDiff);
|
650 |
}
|
651 |
|
652 |
/*
|
653 |
*--------------------------------------------------------------
|
654 |
*
|
655 |
* ImageToArea --
|
656 |
*
|
657 |
* This procedure is called to determine whether an item
|
658 |
* lies entirely inside, entirely outside, or overlapping
|
659 |
* a given rectangle.
|
660 |
*
|
661 |
* Results:
|
662 |
* -1 is returned if the item is entirely outside the area
|
663 |
* given by rectPtr, 0 if it overlaps, and 1 if it is entirely
|
664 |
* inside the given area.
|
665 |
*
|
666 |
* Side effects:
|
667 |
* None.
|
668 |
*
|
669 |
*--------------------------------------------------------------
|
670 |
*/
|
671 |
|
672 |
static int
|
673 |
ImageToArea(canvas, itemPtr, rectPtr)
|
674 |
Tk_Canvas canvas; /* Canvas containing item. */
|
675 |
Tk_Item *itemPtr; /* Item to check against rectangle. */
|
676 |
double *rectPtr; /* Pointer to array of four coordinates
|
677 |
* (x1, y1, x2, y2) describing rectangular
|
678 |
* area. */
|
679 |
{
|
680 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
681 |
|
682 |
if ((rectPtr[2] <= imgPtr->header.x1)
|
683 |
|| (rectPtr[0] >= imgPtr->header.x2)
|
684 |
|| (rectPtr[3] <= imgPtr->header.y1)
|
685 |
|| (rectPtr[1] >= imgPtr->header.y2)) {
|
686 |
return -1;
|
687 |
}
|
688 |
if ((rectPtr[0] <= imgPtr->header.x1)
|
689 |
&& (rectPtr[1] <= imgPtr->header.y1)
|
690 |
&& (rectPtr[2] >= imgPtr->header.x2)
|
691 |
&& (rectPtr[3] >= imgPtr->header.y2)) {
|
692 |
return 1;
|
693 |
}
|
694 |
return 0;
|
695 |
}
|
696 |
|
697 |
/*
|
698 |
*--------------------------------------------------------------
|
699 |
*
|
700 |
* ImageToPostscript --
|
701 |
*
|
702 |
* This procedure is called to generate Postscript for
|
703 |
* image items.
|
704 |
*
|
705 |
* Results:
|
706 |
* The return value is a standard Tcl result. If an error
|
707 |
* occurs in generating Postscript then an error message is
|
708 |
* left in interp->result, replacing whatever used to be there.
|
709 |
* If no error occurs, then Postscript for the item is appended
|
710 |
* to the result.
|
711 |
*
|
712 |
* Side effects:
|
713 |
* None.
|
714 |
*
|
715 |
*--------------------------------------------------------------
|
716 |
*/
|
717 |
|
718 |
static int
|
719 |
ImageToPostscript(interp, canvas, itemPtr, prepass)
|
720 |
Tcl_Interp *interp; /* Leave Postscript or error message
|
721 |
* here. */
|
722 |
Tk_Canvas canvas; /* Information about overall canvas. */
|
723 |
Tk_Item *itemPtr; /* Item for which Postscript is
|
724 |
* wanted. */
|
725 |
int prepass; /* 1 means this is a prepass to
|
726 |
* collect font information; 0 means
|
727 |
* final Postscript is being created.*/
|
728 |
{
|
729 |
ImageItem *imgPtr = (ImageItem *)itemPtr;
|
730 |
Tk_Window canvasWin = Tk_CanvasTkwin(canvas);
|
731 |
|
732 |
char buffer[256];
|
733 |
double x, y;
|
734 |
int width, height;
|
735 |
Tk_Image image;
|
736 |
Tk_State state = itemPtr->state;
|
737 |
|
738 |
if(state == TK_STATE_NULL) {
|
739 |
state = ((TkCanvas *)canvas)->canvas_state;
|
740 |
}
|
741 |
|
742 |
image = imgPtr->image;
|
743 |
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
|
744 |
if (imgPtr->activeImage != NULL) {
|
745 |
image = imgPtr->activeImage;
|
746 |
}
|
747 |
} else if (state == TK_STATE_DISABLED) {
|
748 |
if (imgPtr->disabledImage != NULL) {
|
749 |
image = imgPtr->disabledImage;
|
750 |
}
|
751 |
}
|
752 |
Tk_SizeOfImage(image, &width, &height);
|
753 |
|
754 |
/*
|
755 |
* Compute the coordinates of the lower-left corner of the image,
|
756 |
* taking into account the anchor position for the image.
|
757 |
*/
|
758 |
|
759 |
x = imgPtr->x;
|
760 |
y = Tk_CanvasPsY(canvas, imgPtr->y);
|
761 |
|
762 |
switch (imgPtr->anchor) {
|
763 |
case TK_ANCHOR_NW: y -= height; break;
|
764 |
case TK_ANCHOR_N: x -= width/2.0; y -= height; break;
|
765 |
case TK_ANCHOR_NE: x -= width; y -= height; break;
|
766 |
case TK_ANCHOR_E: x -= width; y -= height/2.0; break;
|
767 |
case TK_ANCHOR_SE: x -= width; break;
|
768 |
case TK_ANCHOR_S: x -= width/2.0; break;
|
769 |
case TK_ANCHOR_SW: break;
|
770 |
case TK_ANCHOR_W: y -= height/2.0; break;
|
771 |
case TK_ANCHOR_CENTER: x -= width/2.0; y -= height/2.0; break;
|
772 |
}
|
773 |
|
774 |
if (image == NULL) {
|
775 |
return TCL_OK;
|
776 |
}
|
777 |
|
778 |
if (!prepass) {
|
779 |
sprintf(buffer, "%.15g %.15g", x, y);
|
780 |
Tcl_AppendResult(interp, buffer, " translate\n", (char *) NULL);
|
781 |
}
|
782 |
|
783 |
return Tk_PostscriptImage(image, interp, canvasWin,
|
784 |
((TkCanvas *) canvas)->psInfo, 0, 0, width, height, prepass);
|
785 |
}
|
786 |
|
787 |
/*
|
788 |
*--------------------------------------------------------------
|
789 |
*
|
790 |
* ScaleImage --
|
791 |
*
|
792 |
* This procedure is invoked to rescale an item.
|
793 |
*
|
794 |
* Results:
|
795 |
* None.
|
796 |
*
|
797 |
* Side effects:
|
798 |
* The item referred to by itemPtr is rescaled so that the
|
799 |
* following transformation is applied to all point coordinates:
|
800 |
* x' = originX + scaleX*(x-originX)
|
801 |
* y' = originY + scaleY*(y-originY)
|
802 |
*
|
803 |
*--------------------------------------------------------------
|
804 |
*/
|
805 |
|
806 |
static void
|
807 |
ScaleImage(canvas, itemPtr, originX, originY, scaleX, scaleY)
|
808 |
Tk_Canvas canvas; /* Canvas containing rectangle. */
|
809 |
Tk_Item *itemPtr; /* Rectangle to be scaled. */
|
810 |
double originX, originY; /* Origin about which to scale rect. */
|
811 |
double scaleX; /* Amount to scale in X direction. */
|
812 |
double scaleY; /* Amount to scale in Y direction. */
|
813 |
{
|
814 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
815 |
|
816 |
imgPtr->x = originX + scaleX*(imgPtr->x - originX);
|
817 |
imgPtr->y = originY + scaleY*(imgPtr->y - originY);
|
818 |
ComputeImageBbox(canvas, imgPtr);
|
819 |
}
|
820 |
|
821 |
/*
|
822 |
*--------------------------------------------------------------
|
823 |
*
|
824 |
* TranslateImage --
|
825 |
*
|
826 |
* This procedure is called to move an item by a given amount.
|
827 |
*
|
828 |
* Results:
|
829 |
* None.
|
830 |
*
|
831 |
* Side effects:
|
832 |
* The position of the item is offset by (xDelta, yDelta), and
|
833 |
* the bounding box is updated in the generic part of the item
|
834 |
* structure.
|
835 |
*
|
836 |
*--------------------------------------------------------------
|
837 |
*/
|
838 |
|
839 |
static void
|
840 |
TranslateImage(canvas, itemPtr, deltaX, deltaY)
|
841 |
Tk_Canvas canvas; /* Canvas containing item. */
|
842 |
Tk_Item *itemPtr; /* Item that is being moved. */
|
843 |
double deltaX, deltaY; /* Amount by which item is to be
|
844 |
* moved. */
|
845 |
{
|
846 |
ImageItem *imgPtr = (ImageItem *) itemPtr;
|
847 |
|
848 |
imgPtr->x += deltaX;
|
849 |
imgPtr->y += deltaY;
|
850 |
ComputeImageBbox(canvas, imgPtr);
|
851 |
}
|
852 |
|
853 |
/*
|
854 |
*----------------------------------------------------------------------
|
855 |
*
|
856 |
* ImageChangedProc --
|
857 |
*
|
858 |
* This procedure is invoked by the image code whenever the manager
|
859 |
* for an image does something that affects the image's size or
|
860 |
* how it is displayed.
|
861 |
*
|
862 |
* Results:
|
863 |
* None.
|
864 |
*
|
865 |
* Side effects:
|
866 |
* Arranges for the canvas to get redisplayed.
|
867 |
*
|
868 |
*----------------------------------------------------------------------
|
869 |
*/
|
870 |
|
871 |
static void
|
872 |
ImageChangedProc(clientData, x, y, width, height, imgWidth, imgHeight)
|
873 |
ClientData clientData; /* Pointer to canvas item for image. */
|
874 |
int x, y; /* Upper left pixel (within image)
|
875 |
* that must be redisplayed. */
|
876 |
int width, height; /* Dimensions of area to redisplay
|
877 |
* (may be <= 0). */
|
878 |
int imgWidth, imgHeight; /* New dimensions of image. */
|
879 |
{
|
880 |
ImageItem *imgPtr = (ImageItem *) clientData;
|
881 |
|
882 |
/*
|
883 |
* If the image's size changed and it's not anchored at its
|
884 |
* northwest corner then just redisplay the entire area of the
|
885 |
* image. This is a bit over-conservative, but we need to do
|
886 |
* something because a size change also means a position change.
|
887 |
*/
|
888 |
|
889 |
if (((imgPtr->header.x2 - imgPtr->header.x1) != imgWidth)
|
890 |
|| ((imgPtr->header.y2 - imgPtr->header.y1) != imgHeight)) {
|
891 |
x = y = 0;
|
892 |
width = imgWidth;
|
893 |
height = imgHeight;
|
894 |
Tk_CanvasEventuallyRedraw(imgPtr->canvas, imgPtr->header.x1,
|
895 |
imgPtr->header.y1, imgPtr->header.x2, imgPtr->header.y2);
|
896 |
}
|
897 |
ComputeImageBbox(imgPtr->canvas, imgPtr);
|
898 |
Tk_CanvasEventuallyRedraw(imgPtr->canvas, imgPtr->header.x1 + x,
|
899 |
imgPtr->header.y1 + y, (int) (imgPtr->header.x1 + x + width),
|
900 |
(int) (imgPtr->header.y1 + y + height));
|
901 |
}
|
902 |
|
903 |
/* End of tkcanvimg.c */
|