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[wxWidgets.git] / src / msw / dc.cpp
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: dc.cpp
3 // Purpose: wxDC class
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 01/02/97
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart and Markus Holzem
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ===========================================================================
13 // declarations
14 // ===========================================================================
15
16 // ---------------------------------------------------------------------------
17 // headers
18 // ---------------------------------------------------------------------------
19
20 #ifdef __GNUG__
21 #pragma implementation "dc.h"
22 #endif
23
24 // For compilers that support precompilation, includes "wx.h".
25 #include "wx/wxprec.h"
26 #include "wx/msw/private.h" // needs to be before #include <commdlg.h>
27
28 #ifdef __BORLANDC__
29 #pragma hdrstop
30 #endif
31
32 #ifndef WX_PRECOMP
33 #include "wx/window.h"
34 #include "wx/dc.h"
35 #include "wx/utils.h"
36 #include "wx/dialog.h"
37 #include "wx/app.h"
38 #include "wx/bitmap.h"
39 #include "wx/dcmemory.h"
40 #include "wx/log.h"
41 #include "wx/icon.h"
42 #endif
43
44 #include "wx/dcprint.h"
45
46 #include <string.h>
47 #include <math.h>
48
49 #if wxUSE_COMMON_DIALOGS
50 #if wxUSE_NORLANDER_HEADERS
51 #include <windows.h>
52 #endif
53 #include <commdlg.h>
54 #endif
55
56 #ifndef __WIN32__
57 #include <print.h>
58 #endif
59
60 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
61
62 // ---------------------------------------------------------------------------
63 // constants
64 // ---------------------------------------------------------------------------
65
66 static const int VIEWPORT_EXTENT = 1000;
67
68 static const int MM_POINTS = 9;
69 static const int MM_METRIC = 10;
70
71 // usually this is defined in math.h
72 #ifndef M_PI
73 static const double M_PI = 3.14159265358979323846;
74 #endif // M_PI
75
76 // ---------------------------------------------------------------------------
77 // private functions
78 // ---------------------------------------------------------------------------
79
80 // convert degrees to radians
81 static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
82
83 // ===========================================================================
84 // implementation
85 // ===========================================================================
86
87 // ---------------------------------------------------------------------------
88 // wxDC
89 // ---------------------------------------------------------------------------
90
91 // Default constructor
92 wxDC::wxDC()
93 {
94 m_canvas = NULL;
95
96 m_oldBitmap = 0;
97 m_oldPen = 0;
98 m_oldBrush = 0;
99 m_oldFont = 0;
100 m_oldPalette = 0;
101
102 m_bOwnsDC = FALSE;
103 m_hDC = 0;
104
105 m_windowExtX = VIEWPORT_EXTENT;
106 m_windowExtY = VIEWPORT_EXTENT;
107
108 m_hDCCount = 0;
109 }
110
111
112 wxDC::~wxDC()
113 {
114 if ( m_hDC != 0 ) {
115 SelectOldObjects(m_hDC);
116 if ( m_bOwnsDC ) {
117 if ( m_canvas == NULL )
118 ::DeleteDC(GetHdc());
119 else
120 ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
121 }
122 }
123
124 }
125
126 // This will select current objects out of the DC,
127 // which is what you have to do before deleting the
128 // DC.
129 void wxDC::SelectOldObjects(WXHDC dc)
130 {
131 if (dc)
132 {
133 if (m_oldBitmap)
134 {
135 ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
136 if (m_selectedBitmap.Ok())
137 {
138 m_selectedBitmap.SetSelectedInto(NULL);
139 }
140 }
141 m_oldBitmap = 0;
142 if (m_oldPen)
143 {
144 ::SelectObject((HDC) dc, (HPEN) m_oldPen);
145 }
146 m_oldPen = 0;
147 if (m_oldBrush)
148 {
149 ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
150 }
151 m_oldBrush = 0;
152 if (m_oldFont)
153 {
154 ::SelectObject((HDC) dc, (HFONT) m_oldFont);
155 }
156 m_oldFont = 0;
157 if (m_oldPalette)
158 {
159 ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
160 }
161 m_oldPalette = 0;
162 }
163
164 m_brush = wxNullBrush;
165 m_pen = wxNullPen;
166 m_palette = wxNullPalette;
167 m_font = wxNullFont;
168 m_backgroundBrush = wxNullBrush;
169 m_selectedBitmap = wxNullBitmap;
170 }
171
172 // ---------------------------------------------------------------------------
173 // clipping
174 // ---------------------------------------------------------------------------
175
176 void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
177 {
178 m_clipping = TRUE;
179 m_clipX1 = (int)cx;
180 m_clipY1 = (int)cy;
181 m_clipX2 = (int)(cx + cw);
182 m_clipY2 = (int)(cy + ch);
183
184 DoClipping((WXHDC) m_hDC);
185 }
186
187 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
188 {
189 wxCHECK_RET( region.GetHRGN(), wxT("invalid clipping region") );
190
191 wxRect box = region.GetBox();
192
193 m_clipping = TRUE;
194 m_clipX1 = box.x;
195 m_clipY1 = box.y;
196 m_clipX2 = box.x + box.width;
197 m_clipY2 = box.y + box.height;
198
199 #ifdef __WIN16__
200 SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
201 #else
202 ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
203 #endif
204 }
205
206 void wxDC::DoClipping(WXHDC dc)
207 {
208 if (m_clipping && dc)
209 {
210 IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
211 XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
212 }
213 }
214
215 void wxDC::DestroyClippingRegion()
216 {
217 if (m_clipping && m_hDC)
218 {
219 // TODO: this should restore the previous clipping region,
220 // so that OnPaint processing works correctly, and the update clipping region
221 // doesn't get destroyed after the first DestroyClippingRegion.
222 HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
223 SelectClipRgn(GetHdc(), rgn);
224 DeleteObject(rgn);
225 }
226 m_clipping = FALSE;
227 }
228
229 // ---------------------------------------------------------------------------
230 // query capabilities
231 // ---------------------------------------------------------------------------
232
233 bool wxDC::CanDrawBitmap() const
234 {
235 return TRUE;
236 }
237
238 bool wxDC::CanGetTextExtent() const
239 {
240 // What sort of display is it?
241 int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
242
243 return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
244 }
245
246 int wxDC::GetDepth() const
247 {
248 return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
249 }
250
251 // ---------------------------------------------------------------------------
252 // drawing
253 // ---------------------------------------------------------------------------
254
255 void wxDC::Clear()
256 {
257 RECT rect;
258 if ( m_canvas )
259 {
260 GetClientRect((HWND) m_canvas->GetHWND(), &rect);
261 }
262 else
263 {
264 wxCHECK_RET( m_selectedBitmap.Ok(), wxT("this DC can't be cleared") );
265
266 rect.left = 0; rect.top = 0;
267 rect.right = m_selectedBitmap.GetWidth();
268 rect.bottom = m_selectedBitmap.GetHeight();
269 }
270
271 (void) ::SetMapMode(GetHdc(), MM_TEXT);
272
273 DWORD colour = GetBkColor(GetHdc());
274 HBRUSH brush = CreateSolidBrush(colour);
275 FillRect(GetHdc(), &rect, brush);
276 DeleteObject(brush);
277
278 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
279 ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
280 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
281 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
282 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
283 }
284
285 void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
286 {
287 (void)ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
288 col.GetPixel(),
289 style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
290 : FLOODFILLBORDER);
291
292 CalcBoundingBox(x, y);
293 }
294
295 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
296 {
297 // added by steve 29.12.94 (copied from DrawPoint)
298 // returns TRUE for pixels in the color of the current pen
299 // and FALSE for all other pixels colors
300 // if col is non-NULL return the color of the pixel
301
302 // get the color of the pixel
303 COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
304 // get the color of the pen
305 COLORREF pencolor = 0x00ffffff;
306 if (m_pen.Ok())
307 {
308 pencolor = m_pen.GetColour().GetPixel();
309 }
310
311 // return the color of the pixel
312 if(col)
313 col->Set(GetRValue(pixelcolor),GetGValue(pixelcolor),GetBValue(pixelcolor));
314
315 // check, if color of the pixels is the same as the color
316 // of the current pen
317 return(pixelcolor==pencolor);
318 }
319
320 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
321 {
322 wxCoord x1 = x-VIEWPORT_EXTENT;
323 wxCoord y1 = y-VIEWPORT_EXTENT;
324 wxCoord x2 = x+VIEWPORT_EXTENT;
325 wxCoord y2 = y+VIEWPORT_EXTENT;
326
327 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
328 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
329
330 (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
331 (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
332
333 CalcBoundingBox(x1, y1);
334 CalcBoundingBox(x2, y2);
335 }
336
337 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
338 {
339 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
340 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
341
342 /* MATTHEW: [6] New normalization */
343 #if WX_STANDARD_GRAPHICS
344 (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
345 #endif
346
347 CalcBoundingBox(x1, y1);
348 CalcBoundingBox(x2, y2);
349 }
350
351 void wxDC::DoDrawArc(wxCoord x1,wxCoord y1,wxCoord x2,wxCoord y2, wxCoord xc, wxCoord yc)
352 {
353 double dx = xc-x1;
354 double dy = yc-y1;
355 double radius = (double)sqrt(dx*dx+dy*dy) ;;
356 if (x1==x2 && x2==y2)
357 {
358 DrawEllipse(xc,yc,(wxCoord)(radius*2.0),(wxCoord)(radius*2.0));
359 return;
360 }
361
362 wxCoord xx1 = XLOG2DEV(x1);
363 wxCoord yy1 = YLOG2DEV(y1);
364 wxCoord xx2 = XLOG2DEV(x2);
365 wxCoord yy2 = YLOG2DEV(y2);
366 wxCoord xxc = XLOG2DEV(xc);
367 wxCoord yyc = YLOG2DEV(yc);
368 wxCoord ray = (wxCoord) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
369
370 (void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
371 wxCoord xxx1 = (wxCoord) (xxc-ray);
372 wxCoord yyy1 = (wxCoord) (yyc-ray);
373 wxCoord xxx2 = (wxCoord) (xxc+ray);
374 wxCoord yyy2 = (wxCoord) (yyc+ray);
375 if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
376 {
377 // Have to add 1 to bottom-right corner of rectangle
378 // to make semi-circles look right (crooked line otherwise).
379 // Unfortunately this is not a reliable method, depends
380 // on the size of shape.
381 // TODO: figure out why this happens!
382 Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
383 xx1,yy1,xx2,yy2);
384 }
385 else
386 Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
387 xx1,yy1,xx2,yy2);
388
389 CalcBoundingBox((wxCoord)(xc-radius), (wxCoord)(yc-radius));
390 CalcBoundingBox((wxCoord)(xc+radius), (wxCoord)(yc+radius));
391 }
392
393 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
394 {
395 COLORREF color = 0x00ffffff;
396 if (m_pen.Ok())
397 {
398 color = m_pen.GetColour().GetPixel();
399 }
400
401 SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
402
403 CalcBoundingBox(x, y);
404 }
405
406 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
407 {
408 // Do things less efficiently if we have offsets
409 if (xoffset != 0 || yoffset != 0)
410 {
411 POINT *cpoints = new POINT[n];
412 int i;
413 for (i = 0; i < n; i++)
414 {
415 cpoints[i].x = (int)(points[i].x + xoffset);
416 cpoints[i].y = (int)(points[i].y + yoffset);
417
418 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
419 }
420 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
421 (void)Polygon(GetHdc(), cpoints, n);
422 SetPolyFillMode(GetHdc(),prev);
423 delete[] cpoints;
424 }
425 else
426 {
427 int i;
428 for (i = 0; i < n; i++)
429 CalcBoundingBox(points[i].x, points[i].y);
430
431 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
432 (void)Polygon(GetHdc(), (POINT*) points, n);
433 SetPolyFillMode(GetHdc(),prev);
434 }
435 }
436
437 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
438 {
439 // Do things less efficiently if we have offsets
440 if (xoffset != 0 || yoffset != 0)
441 {
442 POINT *cpoints = new POINT[n];
443 int i;
444 for (i = 0; i < n; i++)
445 {
446 cpoints[i].x = (int)(points[i].x + xoffset);
447 cpoints[i].y = (int)(points[i].y + yoffset);
448
449 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
450 }
451 (void)Polyline(GetHdc(), cpoints, n);
452 delete[] cpoints;
453 }
454 else
455 {
456 int i;
457 for (i = 0; i < n; i++)
458 CalcBoundingBox(points[i].x, points[i].y);
459
460 (void)Polyline(GetHdc(), (POINT*) points, n);
461 }
462 }
463
464 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
465 {
466 wxCoord x2 = x + width;
467 wxCoord y2 = y + height;
468
469 /* MATTHEW: [6] new normalization */
470 #if WX_STANDARD_GRAPHICS
471 bool do_brush, do_pen;
472
473 do_brush = m_brush.Ok() && m_brush.GetStyle() != wxTRANSPARENT;
474 do_pen = m_pen.Ok() && m_pen.GetStyle() != wxTRANSPARENT;
475
476 if (do_brush) {
477 HPEN orig_pen = NULL;
478
479 if (do_pen || !m_pen.Ok())
480 orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
481
482 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
483 XLOG2DEV(x2) + 1, YLOG2DEV(y2) + 1);
484
485 if (do_pen || !m_pen.Ok())
486 ::SelectObject(GetHdc() , orig_pen);
487 }
488 if (do_pen) {
489 HBRUSH orig_brush = NULL;
490
491 if (do_brush || !m_brush.Ok())
492 orig_brush = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH) ::GetStockObject(NULL_BRUSH));
493
494 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
495 XLOG2DEV(x2), YLOG2DEV(y2));
496
497 if (do_brush || !m_brush.Ok())
498 ::SelectObject(GetHdc(), orig_brush);
499 }
500 #else
501 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
502 #endif
503
504 CalcBoundingBox(x, y);
505 CalcBoundingBox(x2, y2);
506 }
507
508 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
509 {
510 // Now, a negative radius value is interpreted to mean
511 // 'the proportion of the smallest X or Y dimension'
512
513 if (radius < 0.0)
514 {
515 double smallest = 0.0;
516 if (width < height)
517 smallest = width;
518 else
519 smallest = height;
520 radius = (- radius * smallest);
521 }
522
523 wxCoord x2 = (x+width);
524 wxCoord y2 = (y+height);
525
526 (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
527 YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
528
529 CalcBoundingBox(x, y);
530 CalcBoundingBox(x2, y2);
531 }
532
533 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
534 {
535 wxCoord x2 = (x+width);
536 wxCoord y2 = (y+height);
537
538 (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
539
540 CalcBoundingBox(x, y);
541 CalcBoundingBox(x2, y2);
542 }
543
544 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
545 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
546 {
547 wxCoord x2 = (x+w);
548 wxCoord y2 = (y+h);
549
550 int rx1 = XLOG2DEV(x+w/2);
551 int ry1 = YLOG2DEV(y+h/2);
552 int rx2 = rx1;
553 int ry2 = ry1;
554
555 sa = DegToRad(sa);
556 ea = DegToRad(ea);
557
558 rx1 += (int)(100.0 * abs(w) * cos(sa));
559 ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa));
560 rx2 += (int)(100.0 * abs(w) * cos(ea));
561 ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
562
563 // draw pie with NULL_PEN first and then outline otherwise a line is
564 // drawn from the start and end points to the centre
565 HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
566 if (m_signY > 0)
567 {
568 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
569 rx1, ry1, rx2, ry2);
570 }
571 else
572 {
573 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
574 rx1, ry1-1, rx2, ry2-1);
575 }
576 ::SelectObject(GetHdc(), orig_pen);
577 (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
578 rx1, ry1, rx2, ry2);
579
580 CalcBoundingBox(x, y);
581 CalcBoundingBox(x2, y2);
582 }
583
584 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
585 {
586 wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
587
588 ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), GetHiconOf(icon));
589
590 CalcBoundingBox(x, y);
591 CalcBoundingBox(x + icon.GetWidth(), y + icon.GetHeight());
592 }
593
594 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
595 {
596 wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
597
598 int width = bmp.GetWidth(),
599 height = bmp.GetHeight();
600
601 if ( !useMask )
602 {
603 HDC cdc = GetHdc();
604 HDC memdc = ::CreateCompatibleDC( cdc );
605 HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
606
607 wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
608
609 COLORREF old_textground = ::GetTextColor(GetHdc());
610 COLORREF old_background = ::GetBkColor(GetHdc());
611 if (m_textForegroundColour.Ok())
612 {
613 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
614 }
615 if (m_textBackgroundColour.Ok())
616 {
617 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
618 }
619
620 ::SelectObject( memdc, hbitmap );
621 ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
622 ::DeleteDC( memdc );
623
624 ::SetTextColor(GetHdc(), old_textground);
625 ::SetBkColor(GetHdc(), old_background);
626 }
627 else
628 {
629 // Rather than reproduce wxDC::Blit, let's do it at the wxWin API level
630 wxMemoryDC memDC;
631 memDC.SelectObject(bmp);
632
633 Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
634
635 memDC.SelectObject(wxNullBitmap);
636 }
637 }
638
639 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
640 {
641 DrawAnyText(text, x, y);
642
643 // update the bounding box
644 CalcBoundingBox(x, y);
645
646 wxCoord w, h;
647 GetTextExtent(text, &w, &h);
648 CalcBoundingBox(x + w, y + h);
649 }
650
651 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
652 {
653 // prepare for drawing the text
654 if ( m_textForegroundColour.Ok() )
655 SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
656
657 DWORD old_background = 0;
658 if ( m_textBackgroundColour.Ok() )
659 {
660 old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
661 }
662
663 SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
664 : OPAQUE);
665
666 if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
667 text.c_str(), text.length()) == 0 )
668 {
669 wxLogLastError("TextOut");
670 }
671
672 // restore the old parameters (text foreground colour may be left because
673 // it never is set to anything else, but background should remain
674 // transparent even if we just drew an opaque string)
675 if ( m_textBackgroundColour.Ok() )
676 (void)SetBkColor(GetHdc(), old_background);
677
678 SetBkMode(GetHdc(), TRANSPARENT);
679 }
680
681 void wxDC::DoDrawRotatedText(const wxString& text,
682 wxCoord x, wxCoord y,
683 double angle)
684 {
685 // we test that we have some font because otherwise we should still use the
686 // "else" part below to avoid that DrawRotatedText(angle = 180) and
687 // DrawRotatedText(angle = 0) use different fonts (we can't use the default
688 // font for drawing rotated fonts unfortunately)
689 if ( (angle == 0.0) && m_font.Ok() )
690 {
691 DoDrawText(text, x, y);
692 }
693 else
694 {
695 // NB: don't take DEFAULT_GUI_FONT because it's not TrueType and so
696 // can't have non zero orientation/escapement
697 wxFont font = m_font.Ok() ? m_font : *wxNORMAL_FONT;
698 HFONT hfont = (HFONT)font.GetResourceHandle();
699 LOGFONT lf;
700 if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
701 {
702 wxLogLastError("GetObject(hfont)");
703 }
704
705 // GDI wants the angle in tenth of degree
706 long angle10 = (long)(angle * 10);
707 lf.lfEscapement = angle10;
708 lf. lfOrientation = angle10;
709
710 hfont = ::CreateFontIndirect(&lf);
711 if ( !hfont )
712 {
713 wxLogLastError("CreateFont");
714 }
715 else
716 {
717 HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
718
719 DrawAnyText(text, x, y);
720
721 (void)::SelectObject(GetHdc(), hfontOld);
722 }
723
724 // call the bounding box by adding all four vertices of the rectangle
725 // containing the text to it (simpler and probably not slower than
726 // determining which of them is really topmost/leftmost/...)
727 wxCoord w, h;
728 GetTextExtent(text, &w, &h);
729
730 double rad = DegToRad(angle);
731
732 // "upper left" and "upper right"
733 CalcBoundingBox(x, y);
734 CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
735
736 // "bottom left" and "bottom right"
737 x += (wxCoord)(h*sin(rad));
738 y += (wxCoord)(h*cos(rad));
739 CalcBoundingBox(x, y);
740 CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
741 }
742 }
743
744 // ---------------------------------------------------------------------------
745 // set GDI objects
746 // ---------------------------------------------------------------------------
747
748 void wxDC::SetPalette(const wxPalette& palette)
749 {
750 // Set the old object temporarily, in case the assignment deletes an object
751 // that's not yet selected out.
752 if (m_oldPalette)
753 {
754 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
755 m_oldPalette = 0;
756 }
757
758 m_palette = palette;
759
760 if (!m_palette.Ok())
761 {
762 // Setting a NULL colourmap is a way of restoring
763 // the original colourmap
764 if (m_oldPalette)
765 {
766 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
767 m_oldPalette = 0;
768 }
769
770 return;
771 }
772
773 if (m_palette.Ok() && m_palette.GetHPALETTE())
774 {
775 HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
776 if (!m_oldPalette)
777 m_oldPalette = (WXHPALETTE) oldPal;
778
779 ::RealizePalette(GetHdc());
780 }
781 }
782
783 void wxDC::SetFont(const wxFont& the_font)
784 {
785 // Set the old object temporarily, in case the assignment deletes an object
786 // that's not yet selected out.
787 if (m_oldFont)
788 {
789 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
790 m_oldFont = 0;
791 }
792
793 m_font = the_font;
794
795 if (!the_font.Ok())
796 {
797 if (m_oldFont)
798 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
799 m_oldFont = 0;
800 }
801
802 if (m_font.Ok() && m_font.GetResourceHandle())
803 {
804 HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
805 if (f == (HFONT) NULL)
806 {
807 wxLogDebug(wxT("::SelectObject failed in wxDC::SetFont."));
808 }
809 if (!m_oldFont)
810 m_oldFont = (WXHFONT) f;
811 }
812 }
813
814 void wxDC::SetPen(const wxPen& pen)
815 {
816 // Set the old object temporarily, in case the assignment deletes an object
817 // that's not yet selected out.
818 if (m_oldPen)
819 {
820 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
821 m_oldPen = 0;
822 }
823
824 m_pen = pen;
825
826 if (!m_pen.Ok())
827 {
828 if (m_oldPen)
829 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
830 m_oldPen = 0;
831 }
832
833 if (m_pen.Ok())
834 {
835 if (m_pen.GetResourceHandle())
836 {
837 HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
838 if (!m_oldPen)
839 m_oldPen = (WXHPEN) p;
840 }
841 }
842 }
843
844 void wxDC::SetBrush(const wxBrush& brush)
845 {
846 // Set the old object temporarily, in case the assignment deletes an object
847 // that's not yet selected out.
848 if (m_oldBrush)
849 {
850 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
851 m_oldBrush = 0;
852 }
853
854 m_brush = brush;
855
856 if (!m_brush.Ok())
857 {
858 if (m_oldBrush)
859 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
860 m_oldBrush = 0;
861 }
862
863 if (m_brush.Ok())
864 {
865 if (m_brush.GetResourceHandle())
866 {
867 HBRUSH b = 0;
868 b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
869 if (!m_oldBrush)
870 m_oldBrush = (WXHBRUSH) b;
871 }
872 }
873 }
874
875 void wxDC::SetBackground(const wxBrush& brush)
876 {
877 m_backgroundBrush = brush;
878
879 if (!m_backgroundBrush.Ok())
880 return;
881
882 if (m_canvas)
883 {
884 bool customColours = TRUE;
885 // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
886 // change background colours from the control-panel specified colours.
887 if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
888 customColours = FALSE;
889
890 if (customColours)
891 {
892 if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
893 {
894 m_canvas->SetTransparent(TRUE);
895 }
896 else
897 {
898 // New behaviour, 10/2/99: setting the background brush of a DC
899 // doesn't affect the window background colour. However,
900 // I'm leaving in the transparency setting because it's needed by
901 // various controls (e.g. wxStaticText) to determine whether to draw
902 // transparently or not. TODO: maybe this should be a new function
903 // wxWindow::SetTransparency(). Should that apply to the child itself, or the
904 // parent?
905 // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
906 m_canvas->SetTransparent(FALSE);
907 }
908 }
909 }
910 COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
911 {
912 (void)SetBkColor(GetHdc(), new_color);
913 }
914 }
915
916 void wxDC::SetBackgroundMode(int mode)
917 {
918 m_backgroundMode = mode;
919
920 // SetBackgroundColour now only refers to text background
921 // and m_backgroundMode is used there
922
923 /*
924 if (m_backgroundMode == wxTRANSPARENT)
925 ::SetBkMode(GetHdc(), TRANSPARENT);
926 else
927 ::SetBkMode(GetHdc(), OPAQUE);
928 */
929 }
930
931 void wxDC::SetLogicalFunction(int function)
932 {
933 m_logicalFunction = function;
934
935 SetRop((WXHDC) m_hDC);
936 }
937
938 void wxDC::SetRop(WXHDC dc)
939 {
940 if (!dc || m_logicalFunction < 0)
941 return;
942
943 int c_rop;
944 // These may be wrong
945 switch (m_logicalFunction)
946 {
947 // case wxXOR: c_rop = R2_XORPEN; break;
948 case wxXOR: c_rop = R2_NOTXORPEN; break;
949 case wxINVERT: c_rop = R2_NOT; break;
950 case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
951 case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
952 case wxCLEAR: c_rop = R2_WHITE; break;
953 case wxSET: c_rop = R2_BLACK; break;
954 case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
955 case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
956 case wxAND: c_rop = R2_MASKPEN; break;
957 case wxOR: c_rop = R2_MERGEPEN; break;
958 case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
959 case wxEQUIV:
960 case wxNAND:
961 case wxCOPY:
962 default:
963 c_rop = R2_COPYPEN; break;
964 }
965 SetROP2((HDC) dc, c_rop);
966 }
967
968 bool wxDC::StartDoc(const wxString& message)
969 {
970 // We might be previewing, so return TRUE to let it continue.
971 return TRUE;
972 }
973
974 void wxDC::EndDoc()
975 {
976 }
977
978 void wxDC::StartPage()
979 {
980 }
981
982 void wxDC::EndPage()
983 {
984 }
985
986 // ---------------------------------------------------------------------------
987 // text metrics
988 // ---------------------------------------------------------------------------
989
990 wxCoord wxDC::GetCharHeight() const
991 {
992 TEXTMETRIC lpTextMetric;
993
994 GetTextMetrics(GetHdc(), &lpTextMetric);
995
996 return YDEV2LOGREL(lpTextMetric.tmHeight);
997 }
998
999 wxCoord wxDC::GetCharWidth() const
1000 {
1001 TEXTMETRIC lpTextMetric;
1002
1003 GetTextMetrics(GetHdc(), &lpTextMetric);
1004
1005 return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
1006 }
1007
1008 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
1009 wxCoord *descent, wxCoord *externalLeading,
1010 wxFont *theFont) const
1011 {
1012 wxFont *fontToUse = (wxFont*) theFont;
1013 if (!fontToUse)
1014 fontToUse = (wxFont*) &m_font;
1015
1016 SIZE sizeRect;
1017 TEXTMETRIC tm;
1018
1019 GetTextExtentPoint(GetHdc(), WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
1020 GetTextMetrics(GetHdc(), &tm);
1021
1022 if (x) *x = XDEV2LOGREL(sizeRect.cx);
1023 if (y) *y = YDEV2LOGREL(sizeRect.cy);
1024 if (descent) *descent = tm.tmDescent;
1025 if (externalLeading) *externalLeading = tm.tmExternalLeading;
1026 }
1027
1028 void wxDC::SetMapMode(int mode)
1029 {
1030 m_mappingMode = mode;
1031
1032 int pixel_width = 0;
1033 int pixel_height = 0;
1034 int mm_width = 0;
1035 int mm_height = 0;
1036
1037 pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
1038 pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
1039 mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
1040 mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
1041
1042 if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
1043 {
1044 return;
1045 }
1046
1047 double mm2pixelsX = pixel_width/mm_width;
1048 double mm2pixelsY = pixel_height/mm_height;
1049
1050 switch (mode)
1051 {
1052 case wxMM_TWIPS:
1053 {
1054 m_logicalScaleX = (twips2mm * mm2pixelsX);
1055 m_logicalScaleY = (twips2mm * mm2pixelsY);
1056 break;
1057 }
1058 case wxMM_POINTS:
1059 {
1060 m_logicalScaleX = (pt2mm * mm2pixelsX);
1061 m_logicalScaleY = (pt2mm * mm2pixelsY);
1062 break;
1063 }
1064 case wxMM_METRIC:
1065 {
1066 m_logicalScaleX = mm2pixelsX;
1067 m_logicalScaleY = mm2pixelsY;
1068 break;
1069 }
1070 case wxMM_LOMETRIC:
1071 {
1072 m_logicalScaleX = (mm2pixelsX/10.0);
1073 m_logicalScaleY = (mm2pixelsY/10.0);
1074 break;
1075 }
1076 default:
1077 case wxMM_TEXT:
1078 {
1079 m_logicalScaleX = 1.0;
1080 m_logicalScaleY = 1.0;
1081 break;
1082 }
1083 }
1084
1085 if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
1086 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1087
1088 SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1089 m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
1090 m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
1091 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
1092 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1093 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1094 }
1095
1096 void wxDC::SetUserScale(double x, double y)
1097 {
1098 m_userScaleX = x;
1099 m_userScaleY = y;
1100
1101 SetMapMode(m_mappingMode);
1102 }
1103
1104 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1105 {
1106 m_signX = xLeftRight ? 1 : -1;
1107 m_signY = yBottomUp ? -1 : 1;
1108
1109 SetMapMode(m_mappingMode);
1110 }
1111
1112 void wxDC::SetSystemScale(double x, double y)
1113 {
1114 m_scaleX = x;
1115 m_scaleY = y;
1116
1117 SetMapMode(m_mappingMode);
1118 }
1119
1120 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
1121 {
1122 m_logicalOriginX = x;
1123 m_logicalOriginY = y;
1124
1125 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1126 }
1127
1128 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
1129 {
1130 m_deviceOriginX = x;
1131 m_deviceOriginY = y;
1132
1133 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1134 }
1135
1136 // ---------------------------------------------------------------------------
1137 // coordinates transformations
1138 // ---------------------------------------------------------------------------
1139
1140 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
1141 {
1142 return (wxCoord) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1143 }
1144
1145 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
1146 {
1147 return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1148 }
1149
1150 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
1151 {
1152 return (wxCoord) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1153 }
1154
1155 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
1156 {
1157 return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1158 }
1159
1160 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
1161 {
1162 return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1163 }
1164
1165 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
1166 {
1167 return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1168 }
1169
1170 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
1171 {
1172 return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1173 }
1174
1175 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
1176 {
1177 return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1178 }
1179
1180 // ---------------------------------------------------------------------------
1181 // bit blit
1182 // ---------------------------------------------------------------------------
1183
1184 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
1185 wxCoord width, wxCoord height,
1186 wxDC *source, wxCoord xsrc, wxCoord ysrc,
1187 int rop, bool useMask)
1188 {
1189 wxMask *mask = NULL;
1190 if ( useMask )
1191 {
1192 const wxBitmap& bmp = source->m_selectedBitmap;
1193 mask = bmp.GetMask();
1194
1195 wxCHECK_MSG( bmp.Ok() && mask, FALSE,
1196 _T("can't blit with mask without mask") );
1197 }
1198
1199 COLORREF old_textground = ::GetTextColor(GetHdc());
1200 COLORREF old_background = ::GetBkColor(GetHdc());
1201 if (m_textForegroundColour.Ok())
1202 {
1203 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1204 }
1205 if (m_textBackgroundColour.Ok())
1206 {
1207 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1208 }
1209
1210 DWORD dwRop = rop == wxCOPY ? SRCCOPY :
1211 rop == wxCLEAR ? WHITENESS :
1212 rop == wxSET ? BLACKNESS :
1213 rop == wxINVERT ? DSTINVERT :
1214 rop == wxAND ? MERGECOPY :
1215 rop == wxOR ? MERGEPAINT :
1216 rop == wxSRC_INVERT ? NOTSRCCOPY :
1217 rop == wxXOR ? SRCINVERT :
1218 rop == wxOR_REVERSE ? MERGEPAINT :
1219 rop == wxAND_REVERSE ? SRCERASE :
1220 rop == wxSRC_OR ? SRCPAINT :
1221 rop == wxSRC_AND ? SRCAND :
1222 SRCCOPY;
1223
1224 bool success;
1225
1226 if (useMask)
1227 {
1228 #ifdef __WIN32__
1229 if ( ::MaskBlt(GetHdc(), xdest, ydest,
1230 (int)width, (int)height,
1231 GetHdcOf(*source), xsrc, ysrc,
1232 (HBITMAP) mask->GetMaskBitmap(),
1233 0, 0, MAKEROP4(SRCCOPY, PATCOPY)) != 0 )
1234 {
1235 // Success
1236 success = TRUE;
1237 }
1238 else
1239 #endif // Win32
1240 {
1241 // Blit bitmap with mask
1242
1243 // create a temp buffer bitmap and DCs to access it and the mask
1244 HDC dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
1245 HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
1246 HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
1247 ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
1248 ::SelectObject(dc_buffer, buffer_bmap);
1249
1250 // copy dest to buffer
1251 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1252 GetHdc(), xdest, ydest, SRCCOPY) )
1253 {
1254 wxLogLastError("BitBlt");
1255 }
1256
1257 // copy src to buffer using selected raster op
1258 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1259 GetHdcOf(*source), xsrc, ysrc, dwRop) )
1260 {
1261 wxLogLastError("BitBlt");
1262 }
1263
1264 // set masked area in buffer to BLACK (pixel value 0)
1265 COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
1266 COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
1267 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1268 dc_mask, xsrc, ysrc, SRCAND) )
1269 {
1270 wxLogLastError("BitBlt");
1271 }
1272
1273 // set unmasked area in dest to BLACK
1274 ::SetBkColor(GetHdc(), RGB(0, 0, 0));
1275 ::SetTextColor(GetHdc(), RGB(255, 255, 255));
1276 if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,
1277 dc_mask, xsrc, ysrc, SRCAND) )
1278 {
1279 wxLogLastError("BitBlt");
1280 }
1281 ::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
1282 ::SetTextColor(GetHdc(), prevCol);
1283
1284 // OR buffer to dest
1285 success = ::BitBlt(GetHdc(), xdest, ydest,
1286 (int)width, (int)height,
1287 dc_buffer, 0, 0, SRCPAINT) != 0;
1288 if ( !success )
1289 {
1290 wxLogLastError("BitBlt");
1291 }
1292
1293 // tidy up temporary DCs and bitmap
1294 ::SelectObject(dc_mask, 0);
1295 ::DeleteDC(dc_mask);
1296 ::SelectObject(dc_buffer, 0);
1297 ::DeleteDC(dc_buffer);
1298 ::DeleteObject(buffer_bmap);
1299 }
1300 }
1301 else // no mask, just BitBlt() it
1302 {
1303 success = ::BitBlt(GetHdc(), xdest, ydest,
1304 (int)width, (int)height,
1305 GetHdcOf(*source), xsrc, ysrc, dwRop) != 0;
1306 if ( !success )
1307 {
1308 wxLogLastError("BitBlt");
1309 }
1310 }
1311
1312 ::SetTextColor(GetHdc(), old_textground);
1313 ::SetBkColor(GetHdc(), old_background);
1314
1315 return success;
1316 }
1317
1318 void wxDC::DoGetSize(int *w, int *h) const
1319 {
1320 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
1321 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
1322 }
1323
1324 void wxDC::DoGetSizeMM(int *w, int *h) const
1325 {
1326 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
1327 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1328 }
1329
1330 wxSize wxDC::GetPPI() const
1331 {
1332 int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
1333 int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
1334
1335 return wxSize(x, y);
1336 }
1337
1338 // For use by wxWindows only, unless custom units are required.
1339 void wxDC::SetLogicalScale(double x, double y)
1340 {
1341 m_logicalScaleX = x;
1342 m_logicalScaleY = y;
1343 }
1344
1345 #if WXWIN_COMPATIBILITY
1346 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1347 float *descent, float *externalLeading,
1348 wxFont *theFont, bool use16bit) const
1349 {
1350 wxCoord x1, y1, descent1, externalLeading1;
1351 GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1352 *x = x1; *y = y1;
1353 if (descent)
1354 *descent = descent1;
1355 if (externalLeading)
1356 *externalLeading = externalLeading1;
1357 }
1358 #endif
1359
1360 // ---------------------------------------------------------------------------
1361 // spline drawing code
1362 // ---------------------------------------------------------------------------
1363
1364 #if wxUSE_SPLINES
1365
1366 class wxSpline: public wxObject
1367 {
1368 public:
1369 int type;
1370 wxList *points;
1371
1372 wxSpline(wxList *list);
1373 void DeletePoints();
1374
1375 // Doesn't delete points
1376 ~wxSpline();
1377 };
1378
1379 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1380
1381 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1382 double a3, double b3, double a4, double b4);
1383 void wx_clear_stack();
1384 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1385 double *y3, double *x4, double *y4);
1386 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1387 double x4, double y4);
1388 static bool wx_spline_add_point(double x, double y);
1389 static void wx_spline_draw_point_array(wxDC *dc);
1390 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1391
1392 void wxDC::DoDrawSpline(wxList *list)
1393 {
1394 wxSpline spline(list);
1395
1396 wx_draw_open_spline(this, &spline);
1397 }
1398
1399 wxList wx_spline_point_list;
1400
1401 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1402 {
1403 wxPoint *p;
1404 double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1405 double x1, y1, x2, y2;
1406
1407 wxNode *node = spline->points->First();
1408 p = (wxPoint *)node->Data();
1409
1410 x1 = p->x;
1411 y1 = p->y;
1412
1413 node = node->Next();
1414 p = (wxPoint *)node->Data();
1415
1416 x2 = p->x;
1417 y2 = p->y;
1418 cx1 = (double)((x1 + x2) / 2);
1419 cy1 = (double)((y1 + y2) / 2);
1420 cx2 = (double)((cx1 + x2) / 2);
1421 cy2 = (double)((cy1 + y2) / 2);
1422
1423 wx_spline_add_point(x1, y1);
1424
1425 while ((node = node->Next()) != NULL)
1426 {
1427 p = (wxPoint *)node->Data();
1428 x1 = x2;
1429 y1 = y2;
1430 x2 = p->x;
1431 y2 = p->y;
1432 cx4 = (double)(x1 + x2) / 2;
1433 cy4 = (double)(y1 + y2) / 2;
1434 cx3 = (double)(x1 + cx4) / 2;
1435 cy3 = (double)(y1 + cy4) / 2;
1436
1437 wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1438
1439 cx1 = cx4;
1440 cy1 = cy4;
1441 cx2 = (double)(cx1 + x2) / 2;
1442 cy2 = (double)(cy1 + y2) / 2;
1443 }
1444
1445 wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1446 wx_spline_add_point(x2, y2);
1447
1448 wx_spline_draw_point_array(dc);
1449
1450 }
1451
1452 /********************* CURVES FOR SPLINES *****************************
1453
1454 The following spline drawing routine is from
1455
1456 "An Algorithm for High-Speed Curve Generation"
1457 by George Merrill Chaikin,
1458 Computer Graphics and Image Processing, 3, Academic Press,
1459 1974, 346-349.
1460
1461 and
1462
1463 "On Chaikin's Algorithm" by R. F. Riesenfeld,
1464 Computer Graphics and Image Processing, 4, Academic Press,
1465 1975, 304-310.
1466
1467 ***********************************************************************/
1468
1469 #define half(z1, z2) ((z1+z2)/2.0)
1470 #define THRESHOLD 5
1471
1472 /* iterative version */
1473
1474 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1475 double b4)
1476 {
1477 register double xmid, ymid;
1478 double x1, y1, x2, y2, x3, y3, x4, y4;
1479
1480 wx_clear_stack();
1481 wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1482
1483 while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1484 xmid = (double)half(x2, x3);
1485 ymid = (double)half(y2, y3);
1486 if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1487 fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1488 wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1489 wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1490 } else {
1491 wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1492 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1493 wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1494 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1495 }
1496 }
1497 }
1498
1499
1500 /* utilities used by spline drawing routines */
1501
1502
1503 typedef struct wx_spline_stack_struct {
1504 double x1, y1, x2, y2, x3, y3, x4, y4;
1505 }
1506 Stack;
1507
1508 #define SPLINE_STACK_DEPTH 20
1509 static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
1510 static Stack *wx_stack_top;
1511 static int wx_stack_count;
1512
1513 void wx_clear_stack()
1514 {
1515 wx_stack_top = wx_spline_stack;
1516 wx_stack_count = 0;
1517 }
1518
1519 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1520 {
1521 wx_stack_top->x1 = x1;
1522 wx_stack_top->y1 = y1;
1523 wx_stack_top->x2 = x2;
1524 wx_stack_top->y2 = y2;
1525 wx_stack_top->x3 = x3;
1526 wx_stack_top->y3 = y3;
1527 wx_stack_top->x4 = x4;
1528 wx_stack_top->y4 = y4;
1529 wx_stack_top++;
1530 wx_stack_count++;
1531 }
1532
1533 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1534 double *x3, double *y3, double *x4, double *y4)
1535 {
1536 if (wx_stack_count == 0)
1537 return (0);
1538 wx_stack_top--;
1539 wx_stack_count--;
1540 *x1 = wx_stack_top->x1;
1541 *y1 = wx_stack_top->y1;
1542 *x2 = wx_stack_top->x2;
1543 *y2 = wx_stack_top->y2;
1544 *x3 = wx_stack_top->x3;
1545 *y3 = wx_stack_top->y3;
1546 *x4 = wx_stack_top->x4;
1547 *y4 = wx_stack_top->y4;
1548 return (1);
1549 }
1550
1551 static bool wx_spline_add_point(double x, double y)
1552 {
1553 wxPoint *point = new wxPoint;
1554 point->x = (int) x;
1555 point->y = (int) y;
1556 wx_spline_point_list.Append((wxObject*)point);
1557 return TRUE;
1558 }
1559
1560 static void wx_spline_draw_point_array(wxDC *dc)
1561 {
1562 dc->DrawLines(&wx_spline_point_list, 0, 0);
1563 wxNode *node = wx_spline_point_list.First();
1564 while (node)
1565 {
1566 wxPoint *point = (wxPoint *)node->Data();
1567 delete point;
1568 delete node;
1569 node = wx_spline_point_list.First();
1570 }
1571 }
1572
1573 wxSpline::wxSpline(wxList *list)
1574 {
1575 points = list;
1576 }
1577
1578 wxSpline::~wxSpline()
1579 {
1580 }
1581
1582 void wxSpline::DeletePoints()
1583 {
1584 for(wxNode *node = points->First(); node; node = points->First())
1585 {
1586 wxPoint *point = (wxPoint *)node->Data();
1587 delete point;
1588 delete node;
1589 }
1590 delete points;
1591 }
1592
1593
1594 #endif // wxUSE_SPLINES
1595
wxWidgets (Impactor)