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dbe94982 | 1 | ///////////////////////////////////////////////////////////////////////////// |
1e6feb95 VZ |
2 | // Name: common/dcbase.cpp |
3 | // Purpose: generic methods of the wxDC Class | |
4 | // Author: Vadim Zeitlin | |
dbe94982 BM |
5 | // Modified by: |
6 | // Created: 05/25/99 | |
7 | // RCS-ID: $Id$ | |
bd1e9c12 | 8 | // Copyright: (c) wxWindows team |
55d99c7a | 9 | // Licence: wxWindows licence |
dbe94982 BM |
10 | ///////////////////////////////////////////////////////////////////////////// |
11 | ||
1e6feb95 VZ |
12 | // ============================================================================ |
13 | // declarations | |
14 | // ============================================================================ | |
15 | ||
dbe94982 | 16 | #ifdef __GNUG__ |
1e6feb95 | 17 | #pragma implementation "dcbase.h" |
dbe94982 BM |
18 | #endif |
19 | ||
1e6feb95 VZ |
20 | // ---------------------------------------------------------------------------- |
21 | // headers | |
22 | // ---------------------------------------------------------------------------- | |
23 | ||
dbe94982 BM |
24 | // For compilers that support precompilation, includes "wx.h". |
25 | #include "wx/wxprec.h" | |
26 | ||
27 | #ifdef __BORLANDC__ | |
bd1e9c12 | 28 | #pragma hdrstop |
dbe94982 BM |
29 | #endif |
30 | ||
dbe94982 BM |
31 | #include "wx/dc.h" |
32 | ||
672dc5a7 JJ |
33 | #include <math.h> |
34 | ||
27748047 | 35 | // bool wxDCBase::sm_cacheing = FALSE; |
0cbff120 | 36 | |
1e6feb95 VZ |
37 | // ============================================================================ |
38 | // implementation | |
39 | // ============================================================================ | |
40 | ||
41 | // ---------------------------------------------------------------------------- | |
42 | // special symbols | |
43 | // ---------------------------------------------------------------------------- | |
44 | ||
cd9da200 VZ |
45 | void wxDCBase::DoDrawCheckMark(wxCoord x1, wxCoord y1, |
46 | wxCoord width, wxCoord height) | |
47 | { | |
48 | wxCHECK_RET( Ok(), wxT("invalid window dc") ); | |
49 | ||
50 | wxCoord x2 = x1 + width, | |
51 | y2 = y1 + height; | |
52 | ||
53 | // this is to yield width of 3 for width == height == 10 | |
54 | SetPen(wxPen(GetTextForeground(), (width + height + 1) / 7, wxSOLID)); | |
55 | ||
56 | // we're drawing a scaled version of wx/generic/tick.xpm here | |
57 | wxCoord x3 = x1 + (4*width) / 10, // x of the tick bottom | |
58 | y3 = y1 + height / 2; // y of the left tick branch | |
59 | DoDrawLine(x1, y3, x3, y2); | |
60 | DoDrawLine(x3, y2, x2, y1); | |
61 | ||
62 | CalcBoundingBox(x1, y1); | |
63 | CalcBoundingBox(x2, y2); | |
64 | } | |
65 | ||
1e6feb95 VZ |
66 | // ---------------------------------------------------------------------------- |
67 | // line/polygons | |
68 | // ---------------------------------------------------------------------------- | |
69 | ||
72cdf4c9 | 70 | void wxDCBase::DrawLines(const wxList *list, wxCoord xoffset, wxCoord yoffset) |
dbe94982 | 71 | { |
b1d4dd7a | 72 | int n = list->GetCount(); |
dbe94982 BM |
73 | wxPoint *points = new wxPoint[n]; |
74 | ||
75 | int i = 0; | |
222ed1d6 | 76 | for ( wxList::compatibility_iterator node = list->GetFirst(); node; node = node->GetNext(), i++ ) |
dbe94982 | 77 | { |
b1d4dd7a | 78 | wxPoint *point = (wxPoint *)node->GetData(); |
dbe94982 BM |
79 | points[i].x = point->x; |
80 | points[i].y = point->y; | |
81 | } | |
82 | ||
83 | DoDrawLines(n, points, xoffset, yoffset); | |
84 | ||
85 | delete [] points; | |
86 | } | |
87 | ||
88 | ||
89 | void wxDCBase::DrawPolygon(const wxList *list, | |
72cdf4c9 | 90 | wxCoord xoffset, wxCoord yoffset, |
dbe94982 BM |
91 | int fillStyle) |
92 | { | |
b1d4dd7a | 93 | int n = list->GetCount(); |
dbe94982 BM |
94 | wxPoint *points = new wxPoint[n]; |
95 | ||
96 | int i = 0; | |
222ed1d6 | 97 | for ( wxList::compatibility_iterator node = list->GetFirst(); node; node = node->GetNext(), i++ ) |
dbe94982 | 98 | { |
b1d4dd7a | 99 | wxPoint *point = (wxPoint *)node->GetData(); |
dbe94982 BM |
100 | points[i].x = point->x; |
101 | points[i].y = point->y; | |
102 | } | |
103 | ||
104 | DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); | |
105 | ||
106 | delete [] points; | |
107 | } | |
108 | ||
1e6feb95 VZ |
109 | // ---------------------------------------------------------------------------- |
110 | // splines | |
111 | // ---------------------------------------------------------------------------- | |
dbe94982 | 112 | |
88ac883a | 113 | #if wxUSE_SPLINES |
dbe94982 BM |
114 | |
115 | // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?) | |
72cdf4c9 | 116 | void wxDCBase::DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoord x3, wxCoord y3) |
dbe94982 BM |
117 | { |
118 | wxList point_list; | |
119 | ||
120 | wxPoint *point1 = new wxPoint; | |
121 | point1->x = x1; point1->y = y1; | |
122 | point_list.Append((wxObject*)point1); | |
123 | ||
124 | wxPoint *point2 = new wxPoint; | |
125 | point2->x = x2; point2->y = y2; | |
126 | point_list.Append((wxObject*)point2); | |
127 | ||
128 | wxPoint *point3 = new wxPoint; | |
129 | point3->x = x3; point3->y = y3; | |
130 | point_list.Append((wxObject*)point3); | |
131 | ||
132 | DrawSpline(&point_list); | |
133 | ||
222ed1d6 | 134 | for( wxList::compatibility_iterator node = point_list.GetFirst(); node; node = node->GetNext() ) |
dbe94982 | 135 | { |
b1d4dd7a | 136 | wxPoint *p = (wxPoint *)node->GetData(); |
dbe94982 BM |
137 | delete p; |
138 | } | |
139 | } | |
140 | ||
141 | void wxDCBase::DrawSpline(int n, wxPoint points[]) | |
142 | { | |
143 | wxList list; | |
144 | for (int i =0; i < n; i++) | |
145 | { | |
146 | list.Append((wxObject*)&points[i]); | |
147 | } | |
148 | ||
149 | DrawSpline(&list); | |
150 | } | |
151 | ||
fe2e4366 VS |
152 | // ----------------------------------- spline code ---------------------------------------- |
153 | ||
154 | void wx_quadratic_spline(double a1, double b1, double a2, double b2, | |
155 | double a3, double b3, double a4, double b4); | |
156 | void wx_clear_stack(); | |
157 | int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3, | |
158 | double *y3, double *x4, double *y4); | |
159 | void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, | |
160 | double x4, double y4); | |
161 | static bool wx_spline_add_point(double x, double y); | |
162 | static void wx_spline_draw_point_array(wxDCBase *dc); | |
163 | ||
164 | wxList wx_spline_point_list; | |
165 | ||
166 | #define half(z1, z2) ((z1+z2)/2.0) | |
167 | #define THRESHOLD 5 | |
168 | ||
169 | /* iterative version */ | |
170 | ||
171 | void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4, | |
172 | double b4) | |
173 | { | |
174 | register double xmid, ymid; | |
175 | double x1, y1, x2, y2, x3, y3, x4, y4; | |
176 | ||
177 | wx_clear_stack(); | |
178 | wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4); | |
179 | ||
180 | while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) { | |
181 | xmid = (double)half(x2, x3); | |
182 | ymid = (double)half(y2, y3); | |
183 | if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD && | |
184 | fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) { | |
185 | wx_spline_add_point( x1, y1 ); | |
186 | wx_spline_add_point( xmid, ymid ); | |
187 | } else { | |
188 | wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3), | |
189 | (double)half(x3, x4), (double)half(y3, y4), x4, y4); | |
190 | wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2), | |
191 | (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid); | |
192 | } | |
193 | } | |
194 | } | |
195 | ||
196 | /* utilities used by spline drawing routines */ | |
197 | ||
198 | typedef struct wx_spline_stack_struct { | |
199 | double x1, y1, x2, y2, x3, y3, x4, y4; | |
200 | } Stack; | |
201 | ||
202 | #define SPLINE_STACK_DEPTH 20 | |
203 | static Stack wx_spline_stack[SPLINE_STACK_DEPTH]; | |
204 | static Stack *wx_stack_top; | |
205 | static int wx_stack_count; | |
206 | ||
207 | void wx_clear_stack() | |
208 | { | |
209 | wx_stack_top = wx_spline_stack; | |
210 | wx_stack_count = 0; | |
211 | } | |
212 | ||
213 | void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4) | |
214 | { | |
215 | wx_stack_top->x1 = x1; | |
216 | wx_stack_top->y1 = y1; | |
217 | wx_stack_top->x2 = x2; | |
218 | wx_stack_top->y2 = y2; | |
219 | wx_stack_top->x3 = x3; | |
220 | wx_stack_top->y3 = y3; | |
221 | wx_stack_top->x4 = x4; | |
222 | wx_stack_top->y4 = y4; | |
223 | wx_stack_top++; | |
224 | wx_stack_count++; | |
225 | } | |
226 | ||
227 | int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, | |
228 | double *x3, double *y3, double *x4, double *y4) | |
229 | { | |
230 | if (wx_stack_count == 0) | |
231 | return (0); | |
232 | wx_stack_top--; | |
233 | wx_stack_count--; | |
234 | *x1 = wx_stack_top->x1; | |
235 | *y1 = wx_stack_top->y1; | |
236 | *x2 = wx_stack_top->x2; | |
237 | *y2 = wx_stack_top->y2; | |
238 | *x3 = wx_stack_top->x3; | |
239 | *y3 = wx_stack_top->y3; | |
240 | *x4 = wx_stack_top->x4; | |
241 | *y4 = wx_stack_top->y4; | |
242 | return (1); | |
243 | } | |
244 | ||
245 | static bool wx_spline_add_point(double x, double y) | |
246 | { | |
247 | wxPoint *point = new wxPoint ; | |
248 | point->x = (int) x; | |
249 | point->y = (int) y; | |
250 | wx_spline_point_list.Append((wxObject*)point); | |
251 | return TRUE; | |
252 | } | |
253 | ||
254 | static void wx_spline_draw_point_array(wxDCBase *dc) | |
255 | { | |
256 | dc->DrawLines(&wx_spline_point_list, 0, 0 ); | |
222ed1d6 | 257 | wxList::compatibility_iterator node = wx_spline_point_list.GetFirst(); |
fe2e4366 VS |
258 | while (node) |
259 | { | |
b1d4dd7a | 260 | wxPoint *point = (wxPoint *)node->GetData(); |
fe2e4366 | 261 | delete point; |
222ed1d6 | 262 | wx_spline_point_list.Erase(node); |
b1d4dd7a | 263 | node = wx_spline_point_list.GetFirst(); |
fe2e4366 VS |
264 | } |
265 | } | |
266 | ||
267 | void wxDCBase::DoDrawSpline( wxList *points ) | |
268 | { | |
269 | wxCHECK_RET( Ok(), wxT("invalid window dc") ); | |
270 | ||
271 | wxPoint *p; | |
272 | double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4; | |
273 | double x1, y1, x2, y2; | |
274 | ||
222ed1d6 | 275 | wxList::compatibility_iterator node = points->GetFirst(); |
b1d4dd7a | 276 | p = (wxPoint *)node->GetData(); |
fe2e4366 VS |
277 | |
278 | x1 = p->x; | |
279 | y1 = p->y; | |
280 | ||
b1d4dd7a RL |
281 | node = node->GetNext(); |
282 | p = (wxPoint *)node->GetData(); | |
fe2e4366 VS |
283 | |
284 | x2 = p->x; | |
285 | y2 = p->y; | |
286 | cx1 = (double)((x1 + x2) / 2); | |
287 | cy1 = (double)((y1 + y2) / 2); | |
288 | cx2 = (double)((cx1 + x2) / 2); | |
289 | cy2 = (double)((cy1 + y2) / 2); | |
290 | ||
291 | wx_spline_add_point(x1, y1); | |
292 | ||
1b80d34a | 293 | while ((node = node->GetNext())) |
fe2e4366 | 294 | { |
b1d4dd7a | 295 | p = (wxPoint *)node->GetData(); |
fe2e4366 VS |
296 | x1 = x2; |
297 | y1 = y2; | |
298 | x2 = p->x; | |
299 | y2 = p->y; | |
300 | cx4 = (double)(x1 + x2) / 2; | |
301 | cy4 = (double)(y1 + y2) / 2; | |
302 | cx3 = (double)(x1 + cx4) / 2; | |
303 | cy3 = (double)(y1 + cy4) / 2; | |
304 | ||
305 | wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4); | |
306 | ||
307 | cx1 = cx4; | |
308 | cy1 = cy4; | |
309 | cx2 = (double)(cx1 + x2) / 2; | |
310 | cy2 = (double)(cy1 + y2) / 2; | |
311 | } | |
312 | ||
313 | wx_spline_add_point( cx1, cy1 ); | |
314 | wx_spline_add_point( x2, y2 ); | |
315 | ||
316 | wx_spline_draw_point_array( this ); | |
317 | } | |
318 | ||
88ac883a | 319 | #endif // wxUSE_SPLINES |
1e6feb95 VZ |
320 | |
321 | // ---------------------------------------------------------------------------- | |
322 | // enhanced text drawing | |
323 | // ---------------------------------------------------------------------------- | |
324 | ||
325 | void wxDCBase::GetMultiLineTextExtent(const wxString& text, | |
326 | wxCoord *x, | |
327 | wxCoord *y, | |
328 | wxCoord *h, | |
329 | wxFont *font) | |
330 | { | |
c7aaa64f VS |
331 | wxCoord widthTextMax = 0, widthLine, |
332 | heightTextTotal = 0, heightLineDefault = 0, heightLine = 0; | |
1e6feb95 VZ |
333 | |
334 | wxString curLine; | |
335 | for ( const wxChar *pc = text; ; pc++ ) | |
336 | { | |
337 | if ( *pc == _T('\n') || *pc == _T('\0') ) | |
338 | { | |
339 | if ( curLine.empty() ) | |
340 | { | |
341 | // we can't use GetTextExtent - it will return 0 for both width | |
342 | // and height and an empty line should count in height | |
343 | // calculation | |
344 | ||
345 | // assume that this line has the same height as the previous | |
346 | // one | |
347 | if ( !heightLineDefault ) | |
348 | heightLineDefault = heightLine; | |
349 | ||
350 | if ( !heightLineDefault ) | |
351 | { | |
352 | // but we don't know it yet - choose something reasonable | |
353 | GetTextExtent(_T("W"), NULL, &heightLineDefault, | |
354 | NULL, NULL, font); | |
355 | } | |
356 | ||
357 | heightTextTotal += heightLineDefault; | |
358 | } | |
359 | else | |
360 | { | |
361 | GetTextExtent(curLine, &widthLine, &heightLine, | |
362 | NULL, NULL, font); | |
363 | if ( widthLine > widthTextMax ) | |
364 | widthTextMax = widthLine; | |
365 | heightTextTotal += heightLine; | |
366 | } | |
367 | ||
368 | if ( *pc == _T('\n') ) | |
369 | { | |
370 | curLine.clear(); | |
371 | } | |
372 | else | |
373 | { | |
374 | // the end of string | |
375 | break; | |
376 | } | |
377 | } | |
378 | else | |
379 | { | |
380 | curLine += *pc; | |
381 | } | |
382 | } | |
383 | ||
384 | if ( x ) | |
385 | *x = widthTextMax; | |
386 | if ( y ) | |
387 | *y = heightTextTotal; | |
388 | if ( h ) | |
389 | *h = heightLine; | |
390 | } | |
391 | ||
392 | void wxDCBase::DrawLabel(const wxString& text, | |
393 | const wxBitmap& bitmap, | |
394 | const wxRect& rect, | |
395 | int alignment, | |
396 | int indexAccel, | |
397 | wxRect *rectBounding) | |
398 | { | |
399 | // find the text position | |
400 | wxCoord widthText, heightText, heightLine; | |
401 | GetMultiLineTextExtent(text, &widthText, &heightText, &heightLine); | |
402 | ||
403 | wxCoord width, height; | |
404 | if ( bitmap.Ok() ) | |
405 | { | |
406 | width = widthText + bitmap.GetWidth(); | |
407 | height = bitmap.GetHeight(); | |
408 | } | |
409 | else // no bitmap | |
410 | { | |
411 | width = widthText; | |
412 | height = heightText; | |
413 | } | |
414 | ||
415 | wxCoord x, y; | |
416 | if ( alignment & wxALIGN_RIGHT ) | |
417 | { | |
418 | x = rect.GetRight() - width; | |
419 | } | |
420 | else if ( alignment & wxALIGN_CENTRE_HORIZONTAL ) | |
421 | { | |
422 | x = (rect.GetLeft() + rect.GetRight() + 1 - width) / 2; | |
423 | } | |
424 | else // alignment & wxALIGN_LEFT | |
425 | { | |
426 | x = rect.GetLeft(); | |
427 | } | |
428 | ||
429 | if ( alignment & wxALIGN_BOTTOM ) | |
430 | { | |
431 | y = rect.GetBottom() - height; | |
432 | } | |
433 | else if ( alignment & wxALIGN_CENTRE_VERTICAL ) | |
434 | { | |
435 | y = (rect.GetTop() + rect.GetBottom() + 1 - height) / 2; | |
436 | } | |
437 | else // alignment & wxALIGN_TOP | |
438 | { | |
439 | y = rect.GetTop(); | |
440 | } | |
441 | ||
442 | // draw the bitmap first | |
443 | wxCoord x0 = x, | |
444 | y0 = y, | |
445 | width0 = width; | |
446 | if ( bitmap.Ok() ) | |
447 | { | |
448 | DrawBitmap(bitmap, x, y, TRUE /* use mask */); | |
449 | ||
450 | wxCoord offset = bitmap.GetWidth() + 4; | |
451 | x += offset; | |
452 | width -= offset; | |
453 | ||
454 | y += (height - heightText) / 2; | |
455 | } | |
456 | ||
457 | // we will draw the underscore under the accel char later | |
458 | wxCoord startUnderscore = 0, | |
459 | endUnderscore = 0, | |
460 | yUnderscore = 0; | |
461 | ||
462 | // split the string into lines and draw each of them separately | |
463 | wxString curLine; | |
464 | for ( const wxChar *pc = text; ; pc++ ) | |
465 | { | |
466 | if ( *pc == _T('\n') || *pc == _T('\0') ) | |
467 | { | |
468 | int xRealStart = x; // init it here to avoid compielr warnings | |
469 | ||
470 | if ( !curLine.empty() ) | |
471 | { | |
472 | // NB: can't test for !(alignment & wxALIGN_LEFT) because | |
473 | // wxALIGN_LEFT is 0 | |
474 | if ( alignment & (wxALIGN_RIGHT | wxALIGN_CENTRE_HORIZONTAL) ) | |
475 | { | |
476 | wxCoord widthLine; | |
477 | GetTextExtent(curLine, &widthLine, NULL); | |
478 | ||
479 | if ( alignment & wxALIGN_RIGHT ) | |
480 | { | |
481 | xRealStart += width - widthLine; | |
482 | } | |
483 | else // if ( alignment & wxALIGN_CENTRE_HORIZONTAL ) | |
484 | { | |
485 | xRealStart += (width - widthLine) / 2; | |
486 | } | |
487 | } | |
488 | //else: left aligned, nothing to do | |
489 | ||
490 | DrawText(curLine, xRealStart, y); | |
491 | } | |
492 | ||
493 | y += heightLine; | |
494 | ||
495 | // do we have underscore in this line? we can check yUnderscore | |
496 | // because it is set below to just y + heightLine if we do | |
497 | if ( y == yUnderscore ) | |
498 | { | |
499 | // adjust the horz positions to account for the shift | |
500 | startUnderscore += xRealStart; | |
501 | endUnderscore += xRealStart; | |
502 | } | |
503 | ||
504 | if ( *pc == _T('\0') ) | |
505 | break; | |
506 | ||
507 | curLine.clear(); | |
508 | } | |
509 | else // not end of line | |
510 | { | |
328bfc22 | 511 | if ( pc - text.c_str() == indexAccel ) |
1e6feb95 VZ |
512 | { |
513 | // remeber to draw underscore here | |
514 | GetTextExtent(curLine, &startUnderscore, NULL); | |
515 | curLine += *pc; | |
516 | GetTextExtent(curLine, &endUnderscore, NULL); | |
517 | ||
518 | yUnderscore = y + heightLine; | |
519 | } | |
520 | else | |
521 | { | |
522 | curLine += *pc; | |
523 | } | |
524 | } | |
525 | } | |
526 | ||
527 | // draw the underscore if found | |
528 | if ( startUnderscore != endUnderscore ) | |
529 | { | |
530 | // it should be of the same colour as text | |
531 | SetPen(wxPen(GetTextForeground(), 0, wxSOLID)); | |
532 | ||
533 | yUnderscore--; | |
534 | ||
535 | DrawLine(startUnderscore, yUnderscore, endUnderscore, yUnderscore); | |
536 | } | |
537 | ||
538 | // return bounding rect if requested | |
539 | if ( rectBounding ) | |
540 | { | |
541 | *rectBounding = wxRect(x, y - heightText, widthText, heightText); | |
542 | } | |
543 | ||
544 | CalcBoundingBox(x0, y0); | |
545 | CalcBoundingBox(x0 + width0, y0 + height); | |
546 | } |