1 |
578 |
markom |
/*
|
2 |
|
|
* tkCanvPoly.c --
|
3 |
|
|
*
|
4 |
|
|
* This file implements polygon items for canvas widgets.
|
5 |
|
|
*
|
6 |
|
|
* Copyright (c) 1991-1994 The Regents of the University of California.
|
7 |
|
|
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
|
8 |
|
|
*
|
9 |
|
|
* See the file "license.terms" for information on usage and redistribution
|
10 |
|
|
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
11 |
|
|
*
|
12 |
|
|
* RCS: @(#) $Id: tkCanvPoly.c,v 1.1.1.1 2002-01-16 10:25:51 markom Exp $
|
13 |
|
|
*/
|
14 |
|
|
|
15 |
|
|
#include <stdio.h>
|
16 |
|
|
#include "tkInt.h"
|
17 |
|
|
#include "tkPort.h"
|
18 |
|
|
|
19 |
|
|
/*
|
20 |
|
|
* The structure below defines the record for each polygon item.
|
21 |
|
|
*/
|
22 |
|
|
|
23 |
|
|
typedef struct PolygonItem {
|
24 |
|
|
Tk_Item header; /* Generic stuff that's the same for all
|
25 |
|
|
* types. MUST BE FIRST IN STRUCTURE. */
|
26 |
|
|
int numPoints; /* Number of points in polygon (always >= 3).
|
27 |
|
|
* Polygon is always closed. */
|
28 |
|
|
int pointsAllocated; /* Number of points for which space is
|
29 |
|
|
* allocated at *coordPtr. */
|
30 |
|
|
double *coordPtr; /* Pointer to malloc-ed array containing
|
31 |
|
|
* x- and y-coords of all points in polygon.
|
32 |
|
|
* X-coords are even-valued indices, y-coords
|
33 |
|
|
* are corresponding odd-valued indices. */
|
34 |
|
|
int width; /* Width of outline. */
|
35 |
|
|
XColor *outlineColor; /* Color for outline. */
|
36 |
|
|
GC outlineGC; /* Graphics context for drawing outline. */
|
37 |
|
|
XColor *fillColor; /* Foreground color for polygon. */
|
38 |
|
|
Pixmap fillStipple; /* Stipple bitmap for filling polygon. */
|
39 |
|
|
GC fillGC; /* Graphics context for filling polygon. */
|
40 |
|
|
int smooth; /* Non-zero means draw shape smoothed (i.e.
|
41 |
|
|
* with Bezier splines). */
|
42 |
|
|
int splineSteps; /* Number of steps in each spline segment. */
|
43 |
|
|
int autoClosed; /* Zero means the given polygon was closed,
|
44 |
|
|
one means that we auto closed it. */
|
45 |
|
|
} PolygonItem;
|
46 |
|
|
|
47 |
|
|
/*
|
48 |
|
|
* Information used for parsing configuration specs:
|
49 |
|
|
*/
|
50 |
|
|
|
51 |
|
|
static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
|
52 |
|
|
Tk_CanvasTagsPrintProc, (ClientData) NULL
|
53 |
|
|
};
|
54 |
|
|
|
55 |
|
|
static Tk_ConfigSpec configSpecs[] = {
|
56 |
|
|
{TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
|
57 |
|
|
"black", Tk_Offset(PolygonItem, fillColor), TK_CONFIG_NULL_OK},
|
58 |
|
|
{TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
|
59 |
|
|
(char *) NULL, Tk_Offset(PolygonItem, outlineColor), TK_CONFIG_NULL_OK},
|
60 |
|
|
{TK_CONFIG_BOOLEAN, "-smooth", (char *) NULL, (char *) NULL,
|
61 |
|
|
"0", Tk_Offset(PolygonItem, smooth), TK_CONFIG_DONT_SET_DEFAULT},
|
62 |
|
|
{TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL,
|
63 |
|
|
"12", Tk_Offset(PolygonItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT},
|
64 |
|
|
{TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
|
65 |
|
|
(char *) NULL, Tk_Offset(PolygonItem, fillStipple), TK_CONFIG_NULL_OK},
|
66 |
|
|
{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
|
67 |
|
|
(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
|
68 |
|
|
{TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
|
69 |
|
|
"1", Tk_Offset(PolygonItem, width), TK_CONFIG_DONT_SET_DEFAULT},
|
70 |
|
|
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
|
71 |
|
|
(char *) NULL, 0, 0}
|
72 |
|
|
};
|
73 |
|
|
|
74 |
|
|
/*
|
75 |
|
|
* Prototypes for procedures defined in this file:
|
76 |
|
|
*/
|
77 |
|
|
|
78 |
|
|
static void ComputePolygonBbox _ANSI_ARGS_((Tk_Canvas canvas,
|
79 |
|
|
PolygonItem *polyPtr));
|
80 |
|
|
static int ConfigurePolygon _ANSI_ARGS_((Tcl_Interp *interp,
|
81 |
|
|
Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
|
82 |
|
|
char **argv, int flags));
|
83 |
|
|
static int CreatePolygon _ANSI_ARGS_((Tcl_Interp *interp,
|
84 |
|
|
Tk_Canvas canvas, struct Tk_Item *itemPtr,
|
85 |
|
|
int argc, char **argv));
|
86 |
|
|
static void DeletePolygon _ANSI_ARGS_((Tk_Canvas canvas,
|
87 |
|
|
Tk_Item *itemPtr, Display *display));
|
88 |
|
|
static void DisplayPolygon _ANSI_ARGS_((Tk_Canvas canvas,
|
89 |
|
|
Tk_Item *itemPtr, Display *display, Drawable dst,
|
90 |
|
|
int x, int y, int width, int height));
|
91 |
|
|
static int PolygonCoords _ANSI_ARGS_((Tcl_Interp *interp,
|
92 |
|
|
Tk_Canvas canvas, Tk_Item *itemPtr,
|
93 |
|
|
int argc, char **argv));
|
94 |
|
|
static int PolygonToArea _ANSI_ARGS_((Tk_Canvas canvas,
|
95 |
|
|
Tk_Item *itemPtr, double *rectPtr));
|
96 |
|
|
static double PolygonToPoint _ANSI_ARGS_((Tk_Canvas canvas,
|
97 |
|
|
Tk_Item *itemPtr, double *pointPtr));
|
98 |
|
|
static int PolygonToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
|
99 |
|
|
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
|
100 |
|
|
static void ScalePolygon _ANSI_ARGS_((Tk_Canvas canvas,
|
101 |
|
|
Tk_Item *itemPtr, double originX, double originY,
|
102 |
|
|
double scaleX, double scaleY));
|
103 |
|
|
static void TranslatePolygon _ANSI_ARGS_((Tk_Canvas canvas,
|
104 |
|
|
Tk_Item *itemPtr, double deltaX, double deltaY));
|
105 |
|
|
|
106 |
|
|
/*
|
107 |
|
|
* The structures below defines the polygon item type by means
|
108 |
|
|
* of procedures that can be invoked by generic item code.
|
109 |
|
|
*/
|
110 |
|
|
|
111 |
|
|
Tk_ItemType tkPolygonType = {
|
112 |
|
|
"polygon", /* name */
|
113 |
|
|
sizeof(PolygonItem), /* itemSize */
|
114 |
|
|
CreatePolygon, /* createProc */
|
115 |
|
|
configSpecs, /* configSpecs */
|
116 |
|
|
ConfigurePolygon, /* configureProc */
|
117 |
|
|
PolygonCoords, /* coordProc */
|
118 |
|
|
DeletePolygon, /* deleteProc */
|
119 |
|
|
DisplayPolygon, /* displayProc */
|
120 |
|
|
0, /* alwaysRedraw */
|
121 |
|
|
PolygonToPoint, /* pointProc */
|
122 |
|
|
PolygonToArea, /* areaProc */
|
123 |
|
|
PolygonToPostscript, /* postscriptProc */
|
124 |
|
|
ScalePolygon, /* scaleProc */
|
125 |
|
|
TranslatePolygon, /* translateProc */
|
126 |
|
|
(Tk_ItemIndexProc *) NULL, /* indexProc */
|
127 |
|
|
(Tk_ItemCursorProc *) NULL, /* icursorProc */
|
128 |
|
|
(Tk_ItemSelectionProc *) NULL, /* selectionProc */
|
129 |
|
|
(Tk_ItemInsertProc *) NULL, /* insertProc */
|
130 |
|
|
(Tk_ItemDCharsProc *) NULL, /* dTextProc */
|
131 |
|
|
(Tk_ItemType *) NULL /* nextPtr */
|
132 |
|
|
};
|
133 |
|
|
|
134 |
|
|
/*
|
135 |
|
|
* The definition below determines how large are static arrays
|
136 |
|
|
* used to hold spline points (splines larger than this have to
|
137 |
|
|
* have their arrays malloc-ed).
|
138 |
|
|
*/
|
139 |
|
|
|
140 |
|
|
#define MAX_STATIC_POINTS 200
|
141 |
|
|
|
142 |
|
|
/*
|
143 |
|
|
*--------------------------------------------------------------
|
144 |
|
|
*
|
145 |
|
|
* CreatePolygon --
|
146 |
|
|
*
|
147 |
|
|
* This procedure is invoked to create a new polygon item in
|
148 |
|
|
* a canvas.
|
149 |
|
|
*
|
150 |
|
|
* Results:
|
151 |
|
|
* A standard Tcl return value. If an error occurred in
|
152 |
|
|
* creating the item, then an error message is left in
|
153 |
|
|
* interp->result; in this case itemPtr is
|
154 |
|
|
* left uninitialized, so it can be safely freed by the
|
155 |
|
|
* caller.
|
156 |
|
|
*
|
157 |
|
|
* Side effects:
|
158 |
|
|
* A new polygon item is created.
|
159 |
|
|
*
|
160 |
|
|
*--------------------------------------------------------------
|
161 |
|
|
*/
|
162 |
|
|
|
163 |
|
|
static int
|
164 |
|
|
CreatePolygon(interp, canvas, itemPtr, argc, argv)
|
165 |
|
|
Tcl_Interp *interp; /* Interpreter for error reporting. */
|
166 |
|
|
Tk_Canvas canvas; /* Canvas to hold new item. */
|
167 |
|
|
Tk_Item *itemPtr; /* Record to hold new item; header
|
168 |
|
|
* has been initialized by caller. */
|
169 |
|
|
int argc; /* Number of arguments in argv. */
|
170 |
|
|
char **argv; /* Arguments describing polygon. */
|
171 |
|
|
{
|
172 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
173 |
|
|
int i;
|
174 |
|
|
|
175 |
|
|
if (argc < 6) {
|
176 |
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
177 |
|
|
Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
|
178 |
|
|
itemPtr->typePtr->name,
|
179 |
|
|
" x1 y1 x2 y2 x3 y3 ?x4 y4 ...? ?options?\"", (char *) NULL);
|
180 |
|
|
return TCL_ERROR;
|
181 |
|
|
}
|
182 |
|
|
|
183 |
|
|
/*
|
184 |
|
|
* Carry out initialization that is needed in order to clean
|
185 |
|
|
* up after errors during the the remainder of this procedure.
|
186 |
|
|
*/
|
187 |
|
|
|
188 |
|
|
polyPtr->numPoints = 0;
|
189 |
|
|
polyPtr->pointsAllocated = 0;
|
190 |
|
|
polyPtr->coordPtr = NULL;
|
191 |
|
|
polyPtr->width = 1;
|
192 |
|
|
polyPtr->outlineColor = NULL;
|
193 |
|
|
polyPtr->outlineGC = None;
|
194 |
|
|
polyPtr->fillColor = NULL;
|
195 |
|
|
polyPtr->fillStipple = None;
|
196 |
|
|
polyPtr->fillGC = None;
|
197 |
|
|
polyPtr->smooth = 0;
|
198 |
|
|
polyPtr->splineSteps = 12;
|
199 |
|
|
polyPtr->autoClosed = 0;
|
200 |
|
|
|
201 |
|
|
/*
|
202 |
|
|
* Count the number of points and then parse them into a point
|
203 |
|
|
* array. Leading arguments are assumed to be points if they
|
204 |
|
|
* start with a digit or a minus sign followed by a digit.
|
205 |
|
|
*/
|
206 |
|
|
|
207 |
|
|
for (i = 4; i < (argc-1); i+=2) {
|
208 |
|
|
if ((!isdigit(UCHAR(argv[i][0]))) &&
|
209 |
|
|
((argv[i][0] != '-') || (!isdigit(UCHAR(argv[i][1]))))) {
|
210 |
|
|
break;
|
211 |
|
|
}
|
212 |
|
|
}
|
213 |
|
|
if (PolygonCoords(interp, canvas, itemPtr, i, argv) != TCL_OK) {
|
214 |
|
|
goto error;
|
215 |
|
|
}
|
216 |
|
|
|
217 |
|
|
if (ConfigurePolygon(interp, canvas, itemPtr, argc-i, argv+i, 0)
|
218 |
|
|
== TCL_OK) {
|
219 |
|
|
return TCL_OK;
|
220 |
|
|
}
|
221 |
|
|
|
222 |
|
|
error:
|
223 |
|
|
DeletePolygon(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
|
224 |
|
|
return TCL_ERROR;
|
225 |
|
|
}
|
226 |
|
|
|
227 |
|
|
/*
|
228 |
|
|
*--------------------------------------------------------------
|
229 |
|
|
*
|
230 |
|
|
* PolygonCoords --
|
231 |
|
|
*
|
232 |
|
|
* This procedure is invoked to process the "coords" widget
|
233 |
|
|
* command on polygons. See the user documentation for details
|
234 |
|
|
* on what it does.
|
235 |
|
|
*
|
236 |
|
|
* Results:
|
237 |
|
|
* Returns TCL_OK or TCL_ERROR, and sets interp->result.
|
238 |
|
|
*
|
239 |
|
|
* Side effects:
|
240 |
|
|
* The coordinates for the given item may be changed.
|
241 |
|
|
*
|
242 |
|
|
*--------------------------------------------------------------
|
243 |
|
|
*/
|
244 |
|
|
|
245 |
|
|
static int
|
246 |
|
|
PolygonCoords(interp, canvas, itemPtr, argc, argv)
|
247 |
|
|
Tcl_Interp *interp; /* Used for error reporting. */
|
248 |
|
|
Tk_Canvas canvas; /* Canvas containing item. */
|
249 |
|
|
Tk_Item *itemPtr; /* Item whose coordinates are to be
|
250 |
|
|
* read or modified. */
|
251 |
|
|
int argc; /* Number of coordinates supplied in
|
252 |
|
|
* argv. */
|
253 |
|
|
char **argv; /* Array of coordinates: x1, y1,
|
254 |
|
|
* x2, y2, ... */
|
255 |
|
|
{
|
256 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
257 |
|
|
char buffer[TCL_DOUBLE_SPACE];
|
258 |
|
|
int i, numPoints;
|
259 |
|
|
|
260 |
|
|
if (argc == 0) {
|
261 |
|
|
/*
|
262 |
|
|
* Print the coords used to create the polygon. If we auto
|
263 |
|
|
* closed the polygon then we don't report the last point.
|
264 |
|
|
*/
|
265 |
|
|
for (i = 0; i < 2*(polyPtr->numPoints - polyPtr->autoClosed); i++) {
|
266 |
|
|
Tcl_PrintDouble(interp, polyPtr->coordPtr[i], buffer);
|
267 |
|
|
Tcl_AppendElement(interp, buffer);
|
268 |
|
|
}
|
269 |
|
|
} else if (argc < 6) {
|
270 |
|
|
Tcl_AppendResult(interp,
|
271 |
|
|
"too few coordinates for polygon: must have at least 6",
|
272 |
|
|
(char *) NULL);
|
273 |
|
|
return TCL_ERROR;
|
274 |
|
|
} else if (argc & 1) {
|
275 |
|
|
Tcl_AppendResult(interp,
|
276 |
|
|
"odd number of coordinates specified for polygon",
|
277 |
|
|
(char *) NULL);
|
278 |
|
|
return TCL_ERROR;
|
279 |
|
|
} else {
|
280 |
|
|
numPoints = argc/2;
|
281 |
|
|
if (polyPtr->pointsAllocated <= numPoints) {
|
282 |
|
|
if (polyPtr->coordPtr != NULL) {
|
283 |
|
|
ckfree((char *) polyPtr->coordPtr);
|
284 |
|
|
}
|
285 |
|
|
|
286 |
|
|
/*
|
287 |
|
|
* One extra point gets allocated here, just in case we have
|
288 |
|
|
* to add another point to close the polygon.
|
289 |
|
|
*/
|
290 |
|
|
|
291 |
|
|
polyPtr->coordPtr = (double *) ckalloc((unsigned)
|
292 |
|
|
(sizeof(double) * (argc+2)));
|
293 |
|
|
polyPtr->pointsAllocated = numPoints+1;
|
294 |
|
|
}
|
295 |
|
|
for (i = argc-1; i >= 0; i--) {
|
296 |
|
|
if (Tk_CanvasGetCoord(interp, canvas, argv[i],
|
297 |
|
|
&polyPtr->coordPtr[i]) != TCL_OK) {
|
298 |
|
|
return TCL_ERROR;
|
299 |
|
|
}
|
300 |
|
|
}
|
301 |
|
|
polyPtr->numPoints = numPoints;
|
302 |
|
|
polyPtr->autoClosed = 0;
|
303 |
|
|
|
304 |
|
|
/*
|
305 |
|
|
* Close the polygon if it isn't already closed.
|
306 |
|
|
*/
|
307 |
|
|
|
308 |
|
|
if ((polyPtr->coordPtr[argc-2] != polyPtr->coordPtr[0])
|
309 |
|
|
|| (polyPtr->coordPtr[argc-1] != polyPtr->coordPtr[1])) {
|
310 |
|
|
polyPtr->autoClosed = 1;
|
311 |
|
|
polyPtr->numPoints++;
|
312 |
|
|
polyPtr->coordPtr[argc] = polyPtr->coordPtr[0];
|
313 |
|
|
polyPtr->coordPtr[argc+1] = polyPtr->coordPtr[1];
|
314 |
|
|
}
|
315 |
|
|
ComputePolygonBbox(canvas, polyPtr);
|
316 |
|
|
}
|
317 |
|
|
return TCL_OK;
|
318 |
|
|
}
|
319 |
|
|
|
320 |
|
|
/*
|
321 |
|
|
*--------------------------------------------------------------
|
322 |
|
|
*
|
323 |
|
|
* ConfigurePolygon --
|
324 |
|
|
*
|
325 |
|
|
* This procedure is invoked to configure various aspects
|
326 |
|
|
* of a polygon item such as its background color.
|
327 |
|
|
*
|
328 |
|
|
* Results:
|
329 |
|
|
* A standard Tcl result code. If an error occurs, then
|
330 |
|
|
* an error message is left in interp->result.
|
331 |
|
|
*
|
332 |
|
|
* Side effects:
|
333 |
|
|
* Configuration information, such as colors and stipple
|
334 |
|
|
* patterns, may be set for itemPtr.
|
335 |
|
|
*
|
336 |
|
|
*--------------------------------------------------------------
|
337 |
|
|
*/
|
338 |
|
|
|
339 |
|
|
static int
|
340 |
|
|
ConfigurePolygon(interp, canvas, itemPtr, argc, argv, flags)
|
341 |
|
|
Tcl_Interp *interp; /* Interpreter for error reporting. */
|
342 |
|
|
Tk_Canvas canvas; /* Canvas containing itemPtr. */
|
343 |
|
|
Tk_Item *itemPtr; /* Polygon item to reconfigure. */
|
344 |
|
|
int argc; /* Number of elements in argv. */
|
345 |
|
|
char **argv; /* Arguments describing things to configure. */
|
346 |
|
|
int flags; /* Flags to pass to Tk_ConfigureWidget. */
|
347 |
|
|
{
|
348 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
349 |
|
|
XGCValues gcValues;
|
350 |
|
|
GC newGC;
|
351 |
|
|
unsigned long mask;
|
352 |
|
|
Tk_Window tkwin;
|
353 |
|
|
|
354 |
|
|
tkwin = Tk_CanvasTkwin(canvas);
|
355 |
|
|
if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv,
|
356 |
|
|
(char *) polyPtr, flags) != TCL_OK) {
|
357 |
|
|
return TCL_ERROR;
|
358 |
|
|
}
|
359 |
|
|
|
360 |
|
|
/*
|
361 |
|
|
* A few of the options require additional processing, such as
|
362 |
|
|
* graphics contexts.
|
363 |
|
|
*/
|
364 |
|
|
|
365 |
|
|
if (polyPtr->width < 1) {
|
366 |
|
|
polyPtr->width = 1;
|
367 |
|
|
}
|
368 |
|
|
if (polyPtr->outlineColor == NULL) {
|
369 |
|
|
newGC = None;
|
370 |
|
|
} else {
|
371 |
|
|
gcValues.foreground = polyPtr->outlineColor->pixel;
|
372 |
|
|
gcValues.line_width = polyPtr->width;
|
373 |
|
|
gcValues.cap_style = CapRound;
|
374 |
|
|
gcValues.join_style = JoinRound;
|
375 |
|
|
mask = GCForeground|GCLineWidth|GCCapStyle|GCJoinStyle;
|
376 |
|
|
newGC = Tk_GetGCColor(tkwin, mask, &gcValues, polyPtr->outlineColor,
|
377 |
|
|
NULL);
|
378 |
|
|
}
|
379 |
|
|
if (polyPtr->outlineGC != None) {
|
380 |
|
|
Tk_FreeGC(Tk_Display(tkwin), polyPtr->outlineGC);
|
381 |
|
|
}
|
382 |
|
|
polyPtr->outlineGC = newGC;
|
383 |
|
|
|
384 |
|
|
if (polyPtr->fillColor == NULL) {
|
385 |
|
|
newGC = None;
|
386 |
|
|
} else {
|
387 |
|
|
gcValues.foreground = polyPtr->fillColor->pixel;
|
388 |
|
|
mask = GCForeground;
|
389 |
|
|
if (polyPtr->fillStipple != None) {
|
390 |
|
|
gcValues.stipple = polyPtr->fillStipple;
|
391 |
|
|
gcValues.fill_style = FillStippled;
|
392 |
|
|
mask |= GCStipple|GCFillStyle;
|
393 |
|
|
}
|
394 |
|
|
newGC = Tk_GetGCColor(tkwin, mask, &gcValues, polyPtr->fillColor,
|
395 |
|
|
NULL);
|
396 |
|
|
}
|
397 |
|
|
if (polyPtr->fillGC != None) {
|
398 |
|
|
Tk_FreeGC(Tk_Display(tkwin), polyPtr->fillGC);
|
399 |
|
|
}
|
400 |
|
|
polyPtr->fillGC = newGC;
|
401 |
|
|
|
402 |
|
|
/*
|
403 |
|
|
* Keep spline parameters within reasonable limits.
|
404 |
|
|
*/
|
405 |
|
|
|
406 |
|
|
if (polyPtr->splineSteps < 1) {
|
407 |
|
|
polyPtr->splineSteps = 1;
|
408 |
|
|
} else if (polyPtr->splineSteps > 100) {
|
409 |
|
|
polyPtr->splineSteps = 100;
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
ComputePolygonBbox(canvas, polyPtr);
|
413 |
|
|
return TCL_OK;
|
414 |
|
|
}
|
415 |
|
|
|
416 |
|
|
/*
|
417 |
|
|
*--------------------------------------------------------------
|
418 |
|
|
*
|
419 |
|
|
* DeletePolygon --
|
420 |
|
|
*
|
421 |
|
|
* This procedure is called to clean up the data structure
|
422 |
|
|
* associated with a polygon item.
|
423 |
|
|
*
|
424 |
|
|
* Results:
|
425 |
|
|
* None.
|
426 |
|
|
*
|
427 |
|
|
* Side effects:
|
428 |
|
|
* Resources associated with itemPtr are released.
|
429 |
|
|
*
|
430 |
|
|
*--------------------------------------------------------------
|
431 |
|
|
*/
|
432 |
|
|
|
433 |
|
|
static void
|
434 |
|
|
DeletePolygon(canvas, itemPtr, display)
|
435 |
|
|
Tk_Canvas canvas; /* Info about overall canvas widget. */
|
436 |
|
|
Tk_Item *itemPtr; /* Item that is being deleted. */
|
437 |
|
|
Display *display; /* Display containing window for
|
438 |
|
|
* canvas. */
|
439 |
|
|
{
|
440 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
441 |
|
|
|
442 |
|
|
if (polyPtr->coordPtr != NULL) {
|
443 |
|
|
ckfree((char *) polyPtr->coordPtr);
|
444 |
|
|
}
|
445 |
|
|
if (polyPtr->fillColor != NULL) {
|
446 |
|
|
Tk_FreeColor(polyPtr->fillColor);
|
447 |
|
|
}
|
448 |
|
|
if (polyPtr->fillStipple != None) {
|
449 |
|
|
Tk_FreeBitmap(display, polyPtr->fillStipple);
|
450 |
|
|
}
|
451 |
|
|
if (polyPtr->outlineColor != NULL) {
|
452 |
|
|
Tk_FreeColor(polyPtr->outlineColor);
|
453 |
|
|
}
|
454 |
|
|
if (polyPtr->outlineGC != None) {
|
455 |
|
|
Tk_FreeGC(display, polyPtr->outlineGC);
|
456 |
|
|
}
|
457 |
|
|
if (polyPtr->fillGC != None) {
|
458 |
|
|
Tk_FreeGC(display, polyPtr->fillGC);
|
459 |
|
|
}
|
460 |
|
|
}
|
461 |
|
|
|
462 |
|
|
/*
|
463 |
|
|
*--------------------------------------------------------------
|
464 |
|
|
*
|
465 |
|
|
* ComputePolygonBbox --
|
466 |
|
|
*
|
467 |
|
|
* This procedure is invoked to compute the bounding box of
|
468 |
|
|
* all the pixels that may be drawn as part of a polygon.
|
469 |
|
|
*
|
470 |
|
|
* Results:
|
471 |
|
|
* None.
|
472 |
|
|
*
|
473 |
|
|
* Side effects:
|
474 |
|
|
* The fields x1, y1, x2, and y2 are updated in the header
|
475 |
|
|
* for itemPtr.
|
476 |
|
|
*
|
477 |
|
|
*--------------------------------------------------------------
|
478 |
|
|
*/
|
479 |
|
|
|
480 |
|
|
static void
|
481 |
|
|
ComputePolygonBbox(canvas, polyPtr)
|
482 |
|
|
Tk_Canvas canvas; /* Canvas that contains item. */
|
483 |
|
|
PolygonItem *polyPtr; /* Item whose bbox is to be
|
484 |
|
|
* recomputed. */
|
485 |
|
|
{
|
486 |
|
|
double *coordPtr;
|
487 |
|
|
int i;
|
488 |
|
|
|
489 |
|
|
coordPtr = polyPtr->coordPtr;
|
490 |
|
|
polyPtr->header.x1 = polyPtr->header.x2 = (int) *coordPtr;
|
491 |
|
|
polyPtr->header.y1 = polyPtr->header.y2 = (int) coordPtr[1];
|
492 |
|
|
|
493 |
|
|
for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints;
|
494 |
|
|
i++, coordPtr += 2) {
|
495 |
|
|
TkIncludePoint((Tk_Item *) polyPtr, coordPtr);
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
/*
|
499 |
|
|
* Expand bounding box in all directions to account for the outline,
|
500 |
|
|
* which can stick out beyond the polygon. Add one extra pixel of
|
501 |
|
|
* fudge, just in case X rounds differently than we do.
|
502 |
|
|
*/
|
503 |
|
|
|
504 |
|
|
i = (polyPtr->width+1)/2 + 1;
|
505 |
|
|
polyPtr->header.x1 -= i;
|
506 |
|
|
polyPtr->header.x2 += i;
|
507 |
|
|
polyPtr->header.y1 -= i;
|
508 |
|
|
polyPtr->header.y2 += i;
|
509 |
|
|
}
|
510 |
|
|
|
511 |
|
|
/*
|
512 |
|
|
*--------------------------------------------------------------
|
513 |
|
|
*
|
514 |
|
|
* TkFillPolygon --
|
515 |
|
|
*
|
516 |
|
|
* This procedure is invoked to convert a polygon to screen
|
517 |
|
|
* coordinates and display it using a particular GC.
|
518 |
|
|
*
|
519 |
|
|
* Results:
|
520 |
|
|
* None.
|
521 |
|
|
*
|
522 |
|
|
* Side effects:
|
523 |
|
|
* ItemPtr is drawn in drawable using the transformation
|
524 |
|
|
* information in canvas.
|
525 |
|
|
*
|
526 |
|
|
*--------------------------------------------------------------
|
527 |
|
|
*/
|
528 |
|
|
|
529 |
|
|
void
|
530 |
|
|
TkFillPolygon(canvas, coordPtr, numPoints, display, drawable, gc, outlineGC)
|
531 |
|
|
Tk_Canvas canvas; /* Canvas whose coordinate system
|
532 |
|
|
* is to be used for drawing. */
|
533 |
|
|
double *coordPtr; /* Array of coordinates for polygon:
|
534 |
|
|
* x1, y1, x2, y2, .... */
|
535 |
|
|
int numPoints; /* Twice this many coordinates are
|
536 |
|
|
* present at *coordPtr. */
|
537 |
|
|
Display *display; /* Display on which to draw polygon. */
|
538 |
|
|
Drawable drawable; /* Pixmap or window in which to draw
|
539 |
|
|
* polygon. */
|
540 |
|
|
GC gc; /* Graphics context for drawing. */
|
541 |
|
|
GC outlineGC; /* If not None, use this to draw an
|
542 |
|
|
* outline around the polygon after
|
543 |
|
|
* filling it. */
|
544 |
|
|
{
|
545 |
|
|
XPoint staticPoints[MAX_STATIC_POINTS];
|
546 |
|
|
XPoint *pointPtr;
|
547 |
|
|
XPoint *pPtr;
|
548 |
|
|
int i;
|
549 |
|
|
|
550 |
|
|
/*
|
551 |
|
|
* Build up an array of points in screen coordinates. Use a
|
552 |
|
|
* static array unless the polygon has an enormous number of points;
|
553 |
|
|
* in this case, dynamically allocate an array.
|
554 |
|
|
*/
|
555 |
|
|
|
556 |
|
|
if (numPoints <= MAX_STATIC_POINTS) {
|
557 |
|
|
pointPtr = staticPoints;
|
558 |
|
|
} else {
|
559 |
|
|
pointPtr = (XPoint *) ckalloc((unsigned) (numPoints * sizeof(XPoint)));
|
560 |
|
|
}
|
561 |
|
|
|
562 |
|
|
for (i = 0, pPtr = pointPtr; i < numPoints; i += 1, coordPtr += 2, pPtr++) {
|
563 |
|
|
Tk_CanvasDrawableCoords(canvas, coordPtr[0], coordPtr[1], &pPtr->x,
|
564 |
|
|
&pPtr->y);
|
565 |
|
|
}
|
566 |
|
|
|
567 |
|
|
/*
|
568 |
|
|
* Display polygon, then free up polygon storage if it was dynamically
|
569 |
|
|
* allocated.
|
570 |
|
|
*/
|
571 |
|
|
|
572 |
|
|
if (gc != None) {
|
573 |
|
|
XFillPolygon(display, drawable, gc, pointPtr, numPoints, Complex,
|
574 |
|
|
CoordModeOrigin);
|
575 |
|
|
}
|
576 |
|
|
if (outlineGC != None) {
|
577 |
|
|
XDrawLines(display, drawable, outlineGC, pointPtr,
|
578 |
|
|
numPoints, CoordModeOrigin);
|
579 |
|
|
}
|
580 |
|
|
if (pointPtr != staticPoints) {
|
581 |
|
|
ckfree((char *) pointPtr);
|
582 |
|
|
}
|
583 |
|
|
}
|
584 |
|
|
|
585 |
|
|
/*
|
586 |
|
|
*--------------------------------------------------------------
|
587 |
|
|
*
|
588 |
|
|
* DisplayPolygon --
|
589 |
|
|
*
|
590 |
|
|
* This procedure is invoked to draw a polygon item in a given
|
591 |
|
|
* drawable.
|
592 |
|
|
*
|
593 |
|
|
* Results:
|
594 |
|
|
* None.
|
595 |
|
|
*
|
596 |
|
|
* Side effects:
|
597 |
|
|
* ItemPtr is drawn in drawable using the transformation
|
598 |
|
|
* information in canvas.
|
599 |
|
|
*
|
600 |
|
|
*--------------------------------------------------------------
|
601 |
|
|
*/
|
602 |
|
|
|
603 |
|
|
static void
|
604 |
|
|
DisplayPolygon(canvas, itemPtr, display, drawable, x, y, width, height)
|
605 |
|
|
Tk_Canvas canvas; /* Canvas that contains item. */
|
606 |
|
|
Tk_Item *itemPtr; /* Item to be displayed. */
|
607 |
|
|
Display *display; /* Display on which to draw item. */
|
608 |
|
|
Drawable drawable; /* Pixmap or window in which to draw
|
609 |
|
|
* item. */
|
610 |
|
|
int x, y, width, height; /* Describes region of canvas that
|
611 |
|
|
* must be redisplayed (not used). */
|
612 |
|
|
{
|
613 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
614 |
|
|
|
615 |
|
|
if ((polyPtr->fillGC == None) && (polyPtr->outlineGC == None)) {
|
616 |
|
|
return;
|
617 |
|
|
}
|
618 |
|
|
|
619 |
|
|
/*
|
620 |
|
|
* If we're stippling then modify the stipple offset in the GC. Be
|
621 |
|
|
* sure to reset the offset when done, since the GC is supposed to be
|
622 |
|
|
* read-only.
|
623 |
|
|
*/
|
624 |
|
|
|
625 |
|
|
if ((polyPtr->fillStipple != None) && (polyPtr->fillGC != None)) {
|
626 |
|
|
Tk_CanvasSetStippleOrigin(canvas, polyPtr->fillGC);
|
627 |
|
|
}
|
628 |
|
|
|
629 |
|
|
if (!polyPtr->smooth) {
|
630 |
|
|
TkFillPolygon(canvas, polyPtr->coordPtr, polyPtr->numPoints,
|
631 |
|
|
display, drawable, polyPtr->fillGC, polyPtr->outlineGC);
|
632 |
|
|
} else {
|
633 |
|
|
int numPoints;
|
634 |
|
|
XPoint staticPoints[MAX_STATIC_POINTS];
|
635 |
|
|
XPoint *pointPtr;
|
636 |
|
|
|
637 |
|
|
/*
|
638 |
|
|
* This is a smoothed polygon. Display using a set of generated
|
639 |
|
|
* spline points rather than the original points.
|
640 |
|
|
*/
|
641 |
|
|
|
642 |
|
|
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
643 |
|
|
if (numPoints <= MAX_STATIC_POINTS) {
|
644 |
|
|
pointPtr = staticPoints;
|
645 |
|
|
} else {
|
646 |
|
|
pointPtr = (XPoint *) ckalloc((unsigned)
|
647 |
|
|
(numPoints * sizeof(XPoint)));
|
648 |
|
|
}
|
649 |
|
|
numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr,
|
650 |
|
|
polyPtr->numPoints, polyPtr->splineSteps, pointPtr,
|
651 |
|
|
(double *) NULL);
|
652 |
|
|
if (polyPtr->fillGC != None) {
|
653 |
|
|
XFillPolygon(display, drawable, polyPtr->fillGC, pointPtr,
|
654 |
|
|
numPoints, Complex, CoordModeOrigin);
|
655 |
|
|
}
|
656 |
|
|
if (polyPtr->outlineGC != None) {
|
657 |
|
|
XDrawLines(display, drawable, polyPtr->outlineGC, pointPtr,
|
658 |
|
|
numPoints, CoordModeOrigin);
|
659 |
|
|
}
|
660 |
|
|
if (pointPtr != staticPoints) {
|
661 |
|
|
ckfree((char *) pointPtr);
|
662 |
|
|
}
|
663 |
|
|
}
|
664 |
|
|
if ((polyPtr->fillStipple != None) && (polyPtr->fillGC != None)) {
|
665 |
|
|
XSetTSOrigin(display, polyPtr->fillGC, 0, 0);
|
666 |
|
|
}
|
667 |
|
|
}
|
668 |
|
|
|
669 |
|
|
/*
|
670 |
|
|
*--------------------------------------------------------------
|
671 |
|
|
*
|
672 |
|
|
* PolygonToPoint --
|
673 |
|
|
*
|
674 |
|
|
* Computes the distance from a given point to a given
|
675 |
|
|
* polygon, in canvas units.
|
676 |
|
|
*
|
677 |
|
|
* Results:
|
678 |
|
|
* The return value is 0 if the point whose x and y coordinates
|
679 |
|
|
* are pointPtr[0] and pointPtr[1] is inside the polygon. If the
|
680 |
|
|
* point isn't inside the polygon then the return value is the
|
681 |
|
|
* distance from the point to the polygon.
|
682 |
|
|
*
|
683 |
|
|
* Side effects:
|
684 |
|
|
* None.
|
685 |
|
|
*
|
686 |
|
|
*--------------------------------------------------------------
|
687 |
|
|
*/
|
688 |
|
|
|
689 |
|
|
/* ARGSUSED */
|
690 |
|
|
static double
|
691 |
|
|
PolygonToPoint(canvas, itemPtr, pointPtr)
|
692 |
|
|
Tk_Canvas canvas; /* Canvas containing item. */
|
693 |
|
|
Tk_Item *itemPtr; /* Item to check against point. */
|
694 |
|
|
double *pointPtr; /* Pointer to x and y coordinates. */
|
695 |
|
|
{
|
696 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
697 |
|
|
double *coordPtr, distance;
|
698 |
|
|
double staticSpace[2*MAX_STATIC_POINTS];
|
699 |
|
|
int numPoints;
|
700 |
|
|
|
701 |
|
|
if (!polyPtr->smooth) {
|
702 |
|
|
distance = TkPolygonToPoint(polyPtr->coordPtr, polyPtr->numPoints,
|
703 |
|
|
pointPtr);
|
704 |
|
|
} else {
|
705 |
|
|
/*
|
706 |
|
|
* Smoothed polygon. Generate a new set of points and use them
|
707 |
|
|
* for comparison.
|
708 |
|
|
*/
|
709 |
|
|
|
710 |
|
|
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
711 |
|
|
if (numPoints <= MAX_STATIC_POINTS) {
|
712 |
|
|
coordPtr = staticSpace;
|
713 |
|
|
} else {
|
714 |
|
|
coordPtr = (double *) ckalloc((unsigned)
|
715 |
|
|
(2*numPoints*sizeof(double)));
|
716 |
|
|
}
|
717 |
|
|
numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr,
|
718 |
|
|
polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
|
719 |
|
|
coordPtr);
|
720 |
|
|
distance = TkPolygonToPoint(coordPtr, numPoints, pointPtr);
|
721 |
|
|
if (coordPtr != staticSpace) {
|
722 |
|
|
ckfree((char *) coordPtr);
|
723 |
|
|
}
|
724 |
|
|
}
|
725 |
|
|
if (polyPtr->outlineColor != NULL) {
|
726 |
|
|
distance -= polyPtr->width/2.0;
|
727 |
|
|
if (distance < 0) {
|
728 |
|
|
distance = 0;
|
729 |
|
|
}
|
730 |
|
|
}
|
731 |
|
|
return distance;
|
732 |
|
|
}
|
733 |
|
|
|
734 |
|
|
/*
|
735 |
|
|
*--------------------------------------------------------------
|
736 |
|
|
*
|
737 |
|
|
* PolygonToArea --
|
738 |
|
|
*
|
739 |
|
|
* This procedure is called to determine whether an item
|
740 |
|
|
* lies entirely inside, entirely outside, or overlapping
|
741 |
|
|
* a given rectangular area.
|
742 |
|
|
*
|
743 |
|
|
* Results:
|
744 |
|
|
* -1 is returned if the item is entirely outside the area
|
745 |
|
|
* given by rectPtr, 0 if it overlaps, and 1 if it is entirely
|
746 |
|
|
* inside the given area.
|
747 |
|
|
*
|
748 |
|
|
* Side effects:
|
749 |
|
|
* None.
|
750 |
|
|
*
|
751 |
|
|
*--------------------------------------------------------------
|
752 |
|
|
*/
|
753 |
|
|
|
754 |
|
|
/* ARGSUSED */
|
755 |
|
|
static int
|
756 |
|
|
PolygonToArea(canvas, itemPtr, rectPtr)
|
757 |
|
|
Tk_Canvas canvas; /* Canvas containing item. */
|
758 |
|
|
Tk_Item *itemPtr; /* Item to check against polygon. */
|
759 |
|
|
double *rectPtr; /* Pointer to array of four coordinates
|
760 |
|
|
* (x1, y1, x2, y2) describing rectangular
|
761 |
|
|
* area. */
|
762 |
|
|
{
|
763 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
764 |
|
|
double *coordPtr, rect2[4], halfWidth;
|
765 |
|
|
double staticSpace[2*MAX_STATIC_POINTS];
|
766 |
|
|
int numPoints, result;
|
767 |
|
|
|
768 |
|
|
/*
|
769 |
|
|
* Handle smoothed polygons by generating an expanded set of points
|
770 |
|
|
* against which to do the check.
|
771 |
|
|
*/
|
772 |
|
|
|
773 |
|
|
if (polyPtr->smooth) {
|
774 |
|
|
numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps;
|
775 |
|
|
if (numPoints <= MAX_STATIC_POINTS) {
|
776 |
|
|
coordPtr = staticSpace;
|
777 |
|
|
} else {
|
778 |
|
|
coordPtr = (double *) ckalloc((unsigned)
|
779 |
|
|
(2*numPoints*sizeof(double)));
|
780 |
|
|
}
|
781 |
|
|
numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr,
|
782 |
|
|
polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL,
|
783 |
|
|
coordPtr);
|
784 |
|
|
} else {
|
785 |
|
|
numPoints = polyPtr->numPoints;
|
786 |
|
|
coordPtr = polyPtr->coordPtr;
|
787 |
|
|
}
|
788 |
|
|
|
789 |
|
|
if (polyPtr->width <= 1) {
|
790 |
|
|
/*
|
791 |
|
|
* The outline of the polygon doesn't stick out, so we can
|
792 |
|
|
* do a simple check.
|
793 |
|
|
*/
|
794 |
|
|
|
795 |
|
|
result = TkPolygonToArea(coordPtr, numPoints, rectPtr);
|
796 |
|
|
} else {
|
797 |
|
|
/*
|
798 |
|
|
* The polygon has a wide outline, so the check is more complicated.
|
799 |
|
|
* First, check the line segments to see if they overlap the area.
|
800 |
|
|
*/
|
801 |
|
|
|
802 |
|
|
result = TkThickPolyLineToArea(coordPtr, numPoints,
|
803 |
|
|
(double) polyPtr->width, CapRound, JoinRound, rectPtr);
|
804 |
|
|
if (result >= 0) {
|
805 |
|
|
goto done;
|
806 |
|
|
}
|
807 |
|
|
|
808 |
|
|
/*
|
809 |
|
|
* There is no overlap between the polygon's outline and the
|
810 |
|
|
* rectangle. This means either the rectangle is entirely outside
|
811 |
|
|
* the polygon or entirely inside. To tell the difference,
|
812 |
|
|
* see whether the polygon (with 0 outline width) overlaps the
|
813 |
|
|
* rectangle bloated by half the outline width.
|
814 |
|
|
*/
|
815 |
|
|
|
816 |
|
|
halfWidth = polyPtr->width/2.0;
|
817 |
|
|
rect2[0] = rectPtr[0] - halfWidth;
|
818 |
|
|
rect2[1] = rectPtr[1] - halfWidth;
|
819 |
|
|
rect2[2] = rectPtr[2] + halfWidth;
|
820 |
|
|
rect2[3] = rectPtr[3] + halfWidth;
|
821 |
|
|
if (TkPolygonToArea(coordPtr, numPoints, rect2) == -1) {
|
822 |
|
|
result = -1;
|
823 |
|
|
} else {
|
824 |
|
|
result = 0;
|
825 |
|
|
}
|
826 |
|
|
}
|
827 |
|
|
|
828 |
|
|
done:
|
829 |
|
|
if ((coordPtr != staticSpace) && (coordPtr != polyPtr->coordPtr)) {
|
830 |
|
|
ckfree((char *) coordPtr);
|
831 |
|
|
}
|
832 |
|
|
return result;
|
833 |
|
|
}
|
834 |
|
|
|
835 |
|
|
/*
|
836 |
|
|
*--------------------------------------------------------------
|
837 |
|
|
*
|
838 |
|
|
* ScalePolygon --
|
839 |
|
|
*
|
840 |
|
|
* This procedure is invoked to rescale a polygon item.
|
841 |
|
|
*
|
842 |
|
|
* Results:
|
843 |
|
|
* None.
|
844 |
|
|
*
|
845 |
|
|
* Side effects:
|
846 |
|
|
* The polygon referred to by itemPtr is rescaled so that the
|
847 |
|
|
* following transformation is applied to all point
|
848 |
|
|
* coordinates:
|
849 |
|
|
* x' = originX + scaleX*(x-originX)
|
850 |
|
|
* y' = originY + scaleY*(y-originY)
|
851 |
|
|
*
|
852 |
|
|
*--------------------------------------------------------------
|
853 |
|
|
*/
|
854 |
|
|
|
855 |
|
|
static void
|
856 |
|
|
ScalePolygon(canvas, itemPtr, originX, originY, scaleX, scaleY)
|
857 |
|
|
Tk_Canvas canvas; /* Canvas containing polygon. */
|
858 |
|
|
Tk_Item *itemPtr; /* Polygon to be scaled. */
|
859 |
|
|
double originX, originY; /* Origin about which to scale rect. */
|
860 |
|
|
double scaleX; /* Amount to scale in X direction. */
|
861 |
|
|
double scaleY; /* Amount to scale in Y direction. */
|
862 |
|
|
{
|
863 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
864 |
|
|
double *coordPtr;
|
865 |
|
|
int i;
|
866 |
|
|
|
867 |
|
|
for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
|
868 |
|
|
i++, coordPtr += 2) {
|
869 |
|
|
*coordPtr = originX + scaleX*(*coordPtr - originX);
|
870 |
|
|
coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
|
871 |
|
|
}
|
872 |
|
|
ComputePolygonBbox(canvas, polyPtr);
|
873 |
|
|
}
|
874 |
|
|
|
875 |
|
|
/*
|
876 |
|
|
*--------------------------------------------------------------
|
877 |
|
|
*
|
878 |
|
|
* TranslatePolygon --
|
879 |
|
|
*
|
880 |
|
|
* This procedure is called to move a polygon by a given
|
881 |
|
|
* amount.
|
882 |
|
|
*
|
883 |
|
|
* Results:
|
884 |
|
|
* None.
|
885 |
|
|
*
|
886 |
|
|
* Side effects:
|
887 |
|
|
* The position of the polygon is offset by (xDelta, yDelta),
|
888 |
|
|
* and the bounding box is updated in the generic part of the
|
889 |
|
|
* item structure.
|
890 |
|
|
*
|
891 |
|
|
*--------------------------------------------------------------
|
892 |
|
|
*/
|
893 |
|
|
|
894 |
|
|
static void
|
895 |
|
|
TranslatePolygon(canvas, itemPtr, deltaX, deltaY)
|
896 |
|
|
Tk_Canvas canvas; /* Canvas containing item. */
|
897 |
|
|
Tk_Item *itemPtr; /* Item that is being moved. */
|
898 |
|
|
double deltaX, deltaY; /* Amount by which item is to be
|
899 |
|
|
* moved. */
|
900 |
|
|
{
|
901 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
902 |
|
|
double *coordPtr;
|
903 |
|
|
int i;
|
904 |
|
|
|
905 |
|
|
for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
|
906 |
|
|
i++, coordPtr += 2) {
|
907 |
|
|
*coordPtr += deltaX;
|
908 |
|
|
coordPtr[1] += deltaY;
|
909 |
|
|
}
|
910 |
|
|
ComputePolygonBbox(canvas, polyPtr);
|
911 |
|
|
}
|
912 |
|
|
|
913 |
|
|
/*
|
914 |
|
|
*--------------------------------------------------------------
|
915 |
|
|
*
|
916 |
|
|
* PolygonToPostscript --
|
917 |
|
|
*
|
918 |
|
|
* This procedure is called to generate Postscript for
|
919 |
|
|
* polygon items.
|
920 |
|
|
*
|
921 |
|
|
* Results:
|
922 |
|
|
* The return value is a standard Tcl result. If an error
|
923 |
|
|
* occurs in generating Postscript then an error message is
|
924 |
|
|
* left in interp->result, replacing whatever used
|
925 |
|
|
* to be there. If no error occurs, then Postscript for the
|
926 |
|
|
* item is appended to the result.
|
927 |
|
|
*
|
928 |
|
|
* Side effects:
|
929 |
|
|
* None.
|
930 |
|
|
*
|
931 |
|
|
*--------------------------------------------------------------
|
932 |
|
|
*/
|
933 |
|
|
|
934 |
|
|
static int
|
935 |
|
|
PolygonToPostscript(interp, canvas, itemPtr, prepass)
|
936 |
|
|
Tcl_Interp *interp; /* Leave Postscript or error message
|
937 |
|
|
* here. */
|
938 |
|
|
Tk_Canvas canvas; /* Information about overall canvas. */
|
939 |
|
|
Tk_Item *itemPtr; /* Item for which Postscript is
|
940 |
|
|
* wanted. */
|
941 |
|
|
int prepass; /* 1 means this is a prepass to
|
942 |
|
|
* collect font information; 0 means
|
943 |
|
|
* final Postscript is being created. */
|
944 |
|
|
{
|
945 |
|
|
char string[100];
|
946 |
|
|
PolygonItem *polyPtr = (PolygonItem *) itemPtr;
|
947 |
|
|
|
948 |
|
|
/*
|
949 |
|
|
* Fill the area of the polygon.
|
950 |
|
|
*/
|
951 |
|
|
|
952 |
|
|
if (polyPtr->fillColor != NULL) {
|
953 |
|
|
if (!polyPtr->smooth) {
|
954 |
|
|
Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
|
955 |
|
|
polyPtr->numPoints);
|
956 |
|
|
} else {
|
957 |
|
|
TkMakeBezierPostscript(interp, canvas, polyPtr->coordPtr,
|
958 |
|
|
polyPtr->numPoints);
|
959 |
|
|
}
|
960 |
|
|
if (Tk_CanvasPsColor(interp, canvas, polyPtr->fillColor) != TCL_OK) {
|
961 |
|
|
return TCL_ERROR;
|
962 |
|
|
}
|
963 |
|
|
if (polyPtr->fillStipple != None) {
|
964 |
|
|
Tcl_AppendResult(interp, "eoclip ", (char *) NULL);
|
965 |
|
|
if (Tk_CanvasPsStipple(interp, canvas, polyPtr->fillStipple)
|
966 |
|
|
!= TCL_OK) {
|
967 |
|
|
return TCL_ERROR;
|
968 |
|
|
}
|
969 |
|
|
if (polyPtr->outlineColor != NULL) {
|
970 |
|
|
Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL);
|
971 |
|
|
}
|
972 |
|
|
} else {
|
973 |
|
|
Tcl_AppendResult(interp, "eofill\n", (char *) NULL);
|
974 |
|
|
}
|
975 |
|
|
}
|
976 |
|
|
|
977 |
|
|
/*
|
978 |
|
|
* Now draw the outline, if there is one.
|
979 |
|
|
*/
|
980 |
|
|
|
981 |
|
|
if (polyPtr->outlineColor != NULL) {
|
982 |
|
|
if (!polyPtr->smooth) {
|
983 |
|
|
Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
|
984 |
|
|
polyPtr->numPoints);
|
985 |
|
|
} else {
|
986 |
|
|
TkMakeBezierPostscript(interp, canvas, polyPtr->coordPtr,
|
987 |
|
|
polyPtr->numPoints);
|
988 |
|
|
}
|
989 |
|
|
|
990 |
|
|
sprintf(string, "%d setlinewidth\n", polyPtr->width);
|
991 |
|
|
Tcl_AppendResult(interp, string,
|
992 |
|
|
"1 setlinecap\n1 setlinejoin\n", (char *) NULL);
|
993 |
|
|
if (Tk_CanvasPsColor(interp, canvas, polyPtr->outlineColor)
|
994 |
|
|
!= TCL_OK) {
|
995 |
|
|
return TCL_ERROR;
|
996 |
|
|
}
|
997 |
|
|
Tcl_AppendResult(interp, "stroke\n", (char *) NULL);
|
998 |
|
|
}
|
999 |
|
|
return TCL_OK;
|
1000 |
|
|
}
|