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1. more (minor) wxCaret bug fixes
[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
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #ifndef WX_PRECOMP
32 #include "wx/frame.h"
33 #include "wx/dc.h"
34 #include "wx/utils.h"
35 #include "wx/dialog.h"
36 #include "wx/app.h"
37 #include "wx/bitmap.h"
38 #include "wx/dcmemory.h"
39 #endif
40
41 #include "wx/dcprint.h"
42 #include "wx/msw/private.h"
43
44 #include <string.h>
45 #include <math.h>
46
47 #if wxUSE_COMMON_DIALOGS
48 #include <commdlg.h>
49 #endif
50
51 #ifndef __WIN32__
52 #include <print.h>
53 #endif
54
55 #if !USE_SHARED_LIBRARY
56 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
57 #endif
58
59 // ---------------------------------------------------------------------------
60 // constants
61 // ---------------------------------------------------------------------------
62
63 static const int VIEWPORT_EXTENT = 1000;
64
65 static const int MM_POINTS = 9;
66 static const int MM_METRIC = 10;
67
68 // ---------------------------------------------------------------------------
69 // macros
70 // ---------------------------------------------------------------------------
71
72 // Logical to device
73 // Absolute
74 #define XLOG2DEV(x) (x)
75 #define YLOG2DEV(y) (y)
76
77 // Relative
78 #define XLOG2DEVREL(x) (x)
79 #define YLOG2DEVREL(y) (y)
80
81 // Device to logical
82 // Absolute
83 #define XDEV2LOG(x) (x)
84
85 #define YDEV2LOG(y) (y)
86
87 // Relative
88 #define XDEV2LOGREL(x) (x)
89 #define YDEV2LOGREL(y) (y)
90
91 /*
92 * Have the same macros as for XView but not for every operation:
93 * just for calculating window/viewport extent (a better way of scaling).
94 */
95
96 // Logical to device
97 // Absolute
98 #define MS_XLOG2DEV(x) LogicalToDevice(x)
99
100 #define MS_YLOG2DEV(y) LogicalToDevice(y)
101
102 // Relative
103 #define MS_XLOG2DEVREL(x) LogicalToDeviceXRel(x)
104 #define MS_YLOG2DEVREL(y) LogicalToDeviceYRel(y)
105
106 // Device to logical
107 // Absolute
108 #define MS_XDEV2LOG(x) DeviceToLogicalX(x)
109
110 #define MS_YDEV2LOG(y) DeviceToLogicalY(y)
111
112 // Relative
113 #define MS_XDEV2LOGREL(x) DeviceToLogicalXRel(x)
114 #define MS_YDEV2LOGREL(y) DeviceToLogicalYRel(y)
115
116 #define YSCALE(y) (yorigin - (y))
117
118 #define wx_round(a) (int)((a)+.5)
119
120 // ===========================================================================
121 // implementation
122 // ===========================================================================
123
124 // ---------------------------------------------------------------------------
125 // wxDC
126 // ---------------------------------------------------------------------------
127
128 // Default constructor
129 wxDC::wxDC()
130 {
131 m_canvas = NULL;
132
133 m_oldBitmap = 0;
134 m_oldPen = 0;
135 m_oldBrush = 0;
136 m_oldFont = 0;
137 m_oldPalette = 0;
138
139 m_bOwnsDC = FALSE;
140 m_hDC = 0;
141
142 m_windowExtX = VIEWPORT_EXTENT;
143 m_windowExtY = VIEWPORT_EXTENT;
144
145 m_hDCCount = 0;
146 }
147
148
149 wxDC::~wxDC()
150 {
151 if ( m_hDC != 0 ) {
152 SelectOldObjects(m_hDC);
153 if ( m_bOwnsDC ) {
154 if ( m_canvas == NULL )
155 ::DeleteDC(GetHdc());
156 else
157 ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
158 }
159 }
160
161 }
162
163 // This will select current objects out of the DC,
164 // which is what you have to do before deleting the
165 // DC.
166 void wxDC::SelectOldObjects(WXHDC dc)
167 {
168 if (dc)
169 {
170 if (m_oldBitmap)
171 {
172 ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
173 if (m_selectedBitmap.Ok())
174 {
175 m_selectedBitmap.SetSelectedInto(NULL);
176 }
177 }
178 m_oldBitmap = 0;
179 if (m_oldPen)
180 {
181 ::SelectObject((HDC) dc, (HPEN) m_oldPen);
182 }
183 m_oldPen = 0;
184 if (m_oldBrush)
185 {
186 ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
187 }
188 m_oldBrush = 0;
189 if (m_oldFont)
190 {
191 ::SelectObject((HDC) dc, (HFONT) m_oldFont);
192 }
193 m_oldFont = 0;
194 if (m_oldPalette)
195 {
196 ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
197 }
198 m_oldPalette = 0;
199 }
200
201 m_brush = wxNullBrush;
202 m_pen = wxNullPen;
203 m_palette = wxNullPalette;
204 m_font = wxNullFont;
205 m_backgroundBrush = wxNullBrush;
206 m_selectedBitmap = wxNullBitmap;
207 }
208
209 // ---------------------------------------------------------------------------
210 // clipping
211 // ---------------------------------------------------------------------------
212
213 void wxDC::DoSetClippingRegion(long cx, long cy, long cw, long ch)
214 {
215 m_clipping = TRUE;
216 m_clipX1 = (int)cx;
217 m_clipY1 = (int)cy;
218 m_clipX2 = (int)(cx + cw);
219 m_clipY2 = (int)(cy + ch);
220
221 DoClipping((WXHDC) m_hDC);
222 }
223
224 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
225 {
226 wxCHECK_RET( region.GetHRGN(), _T("invalid clipping region") );
227
228 wxRect box = region.GetBox();
229
230 m_clipping = TRUE;
231 m_clipX1 = box.x;
232 m_clipY1 = box.y;
233 m_clipX2 = box.x + box.width;
234 m_clipY2 = box.y + box.height;
235
236 #ifdef __WIN16__
237 SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
238 #else
239 ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
240 #endif
241 }
242
243 void wxDC::DoClipping(WXHDC dc)
244 {
245 if (m_clipping && dc)
246 {
247 IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
248 XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
249 }
250 }
251
252 void wxDC::DestroyClippingRegion()
253 {
254 if (m_clipping && m_hDC)
255 {
256 // TODO: this should restore the previous clipping region,
257 // so that OnPaint processing works correctly, and the update clipping region
258 // doesn't get destroyed after the first DestroyClippingRegion.
259 HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
260 SelectClipRgn(GetHdc(), rgn);
261 DeleteObject(rgn);
262 }
263 m_clipping = FALSE;
264 }
265
266 // ---------------------------------------------------------------------------
267 // query capabilities
268 // ---------------------------------------------------------------------------
269
270 bool wxDC::CanDrawBitmap() const
271 {
272 return TRUE;
273 }
274
275 bool wxDC::CanGetTextExtent() const
276 {
277 // What sort of display is it?
278 int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
279
280 return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
281 }
282
283 int wxDC::GetDepth() const
284 {
285 return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
286 }
287
288 // ---------------------------------------------------------------------------
289 // drawing
290 // ---------------------------------------------------------------------------
291
292 void wxDC::Clear()
293 {
294 RECT rect;
295 if (m_canvas)
296 GetClientRect((HWND) m_canvas->GetHWND(), &rect);
297 else if (m_selectedBitmap.Ok())
298 {
299 rect.left = 0; rect.top = 0;
300 rect.right = m_selectedBitmap.GetWidth();
301 rect.bottom = m_selectedBitmap.GetHeight();
302 }
303 (void) ::SetMapMode(GetHdc(), MM_TEXT);
304
305 DWORD colour = GetBkColor(GetHdc());
306 HBRUSH brush = CreateSolidBrush(colour);
307 FillRect(GetHdc(), &rect, brush);
308 DeleteObject(brush);
309
310 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
311 ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
312 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
313 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
314 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
315 }
316
317 void wxDC::DoFloodFill(long x, long y, const wxColour& col, int style)
318 {
319 (void)ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
320 col.GetPixel(),
321 style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
322 : FLOODFILLBORDER);
323
324 CalcBoundingBox(x, y);
325 }
326
327 bool wxDC::DoGetPixel(long x, long y, wxColour *col) const
328 {
329 // added by steve 29.12.94 (copied from DrawPoint)
330 // returns TRUE for pixels in the color of the current pen
331 // and FALSE for all other pixels colors
332 // if col is non-NULL return the color of the pixel
333
334 // get the color of the pixel
335 COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
336 // get the color of the pen
337 COLORREF pencolor = 0x00ffffff;
338 if (m_pen.Ok())
339 {
340 pencolor = m_pen.GetColour().GetPixel();
341 }
342
343 // return the color of the pixel
344 if(col)
345 col->Set(GetRValue(pixelcolor),GetGValue(pixelcolor),GetBValue(pixelcolor));
346
347 // check, if color of the pixels is the same as the color
348 // of the current pen
349 return(pixelcolor==pencolor);
350 }
351
352 void wxDC::DoCrossHair(long x, long y)
353 {
354 long x1 = x-VIEWPORT_EXTENT;
355 long y1 = y-VIEWPORT_EXTENT;
356 long x2 = x+VIEWPORT_EXTENT;
357 long y2 = y+VIEWPORT_EXTENT;
358
359 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
360 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
361
362 (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
363 (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
364
365 CalcBoundingBox(x1, y1);
366 CalcBoundingBox(x2, y2);
367 }
368
369 void wxDC::DoDrawLine(long x1, long y1, long x2, long y2)
370 {
371 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
372 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
373
374 /* MATTHEW: [6] New normalization */
375 #if WX_STANDARD_GRAPHICS
376 (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
377 #endif
378
379 CalcBoundingBox(x1, y1);
380 CalcBoundingBox(x2, y2);
381 }
382
383 void wxDC::DoDrawArc(long x1,long y1,long x2,long y2, long xc, long yc)
384 {
385 double dx = xc-x1;
386 double dy = yc-y1;
387 double radius = (double)sqrt(dx*dx+dy*dy) ;;
388 if (x1==x2 && x2==y2)
389 {
390 DrawEllipse(xc,yc,(long)(radius*2.0),(long)(radius*2.0));
391 return;
392 }
393
394 long xx1 = XLOG2DEV(x1);
395 long yy1 = YLOG2DEV(y1);
396 long xx2 = XLOG2DEV(x2);
397 long yy2 = YLOG2DEV(y2);
398 long xxc = XLOG2DEV(xc);
399 long yyc = YLOG2DEV(yc);
400 long ray = (long) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
401
402 (void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
403 long xxx1 = (long) (xxc-ray);
404 long yyy1 = (long) (yyc-ray);
405 long xxx2 = (long) (xxc+ray);
406 long yyy2 = (long) (yyc+ray);
407 if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
408 {
409 // Have to add 1 to bottom-right corner of rectangle
410 // to make semi-circles look right (crooked line otherwise).
411 // Unfortunately this is not a reliable method, depends
412 // on the size of shape.
413 // TODO: figure out why this happens!
414 Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
415 xx1,yy1,xx2,yy2);
416 }
417 else
418 Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
419 xx1,yy1,xx2,yy2);
420
421 CalcBoundingBox((xc-radius), (yc-radius));
422 CalcBoundingBox((xc+radius), (yc+radius));
423 }
424
425 void wxDC::DoDrawPoint(long x, long y)
426 {
427 COLORREF color = 0x00ffffff;
428 if (m_pen.Ok())
429 {
430 color = m_pen.GetColour().GetPixel();
431 }
432
433 SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
434
435 CalcBoundingBox(x, y);
436 }
437
438 void wxDC::DoDrawPolygon(int n, wxPoint points[], long xoffset, long yoffset,int fillStyle)
439 {
440 // Do things less efficiently if we have offsets
441 if (xoffset != 0 || yoffset != 0)
442 {
443 POINT *cpoints = new POINT[n];
444 int i;
445 for (i = 0; i < n; i++)
446 {
447 cpoints[i].x = (int)(points[i].x + xoffset);
448 cpoints[i].y = (int)(points[i].y + yoffset);
449
450 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
451 }
452 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
453 (void)Polygon(GetHdc(), cpoints, n);
454 SetPolyFillMode(GetHdc(),prev);
455 delete[] cpoints;
456 }
457 else
458 {
459 int i;
460 for (i = 0; i < n; i++)
461 CalcBoundingBox(points[i].x, points[i].y);
462
463 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
464 (void)Polygon(GetHdc(), (POINT*) points, n);
465 SetPolyFillMode(GetHdc(),prev);
466 }
467 }
468
469 void wxDC::DoDrawLines(int n, wxPoint points[], long xoffset, long yoffset)
470 {
471 // Do things less efficiently if we have offsets
472 if (xoffset != 0 || yoffset != 0)
473 {
474 POINT *cpoints = new POINT[n];
475 int i;
476 for (i = 0; i < n; i++)
477 {
478 cpoints[i].x = (int)(points[i].x + xoffset);
479 cpoints[i].y = (int)(points[i].y + yoffset);
480
481 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
482 }
483 (void)Polyline(GetHdc(), cpoints, n);
484 delete[] cpoints;
485 }
486 else
487 {
488 int i;
489 for (i = 0; i < n; i++)
490 CalcBoundingBox(points[i].x, points[i].y);
491
492 (void)Polyline(GetHdc(), (POINT*) points, n);
493 }
494 }
495
496 void wxDC::DoDrawRectangle(long x, long y, long width, long height)
497 {
498 long x2 = x + width;
499 long y2 = y + height;
500
501 /* MATTHEW: [6] new normalization */
502 #if WX_STANDARD_GRAPHICS
503 bool do_brush, do_pen;
504
505 do_brush = m_brush.Ok() && m_brush.GetStyle() != wxTRANSPARENT;
506 do_pen = m_pen.Ok() && m_pen.GetStyle() != wxTRANSPARENT;
507
508 if (do_brush) {
509 HPEN orig_pen = NULL;
510
511 if (do_pen || !m_pen.Ok())
512 orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
513
514 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
515 XLOG2DEV(x2) + 1, YLOG2DEV(y2) + 1);
516
517 if (do_pen || !m_pen.Ok())
518 ::SelectObject(GetHdc() , orig_pen);
519 }
520 if (do_pen) {
521 HBRUSH orig_brush = NULL;
522
523 if (do_brush || !m_brush.Ok())
524 orig_brush = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH) ::GetStockObject(NULL_BRUSH));
525
526 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
527 XLOG2DEV(x2), YLOG2DEV(y2));
528
529 if (do_brush || !m_brush.Ok())
530 ::SelectObject(GetHdc(), orig_brush);
531 }
532 #else
533 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
534 #endif
535
536 CalcBoundingBox(x, y);
537 CalcBoundingBox(x2, y2);
538 }
539
540 void wxDC::DoDrawRoundedRectangle(long x, long y, long width, long height, double radius)
541 {
542 // Now, a negative radius value is interpreted to mean
543 // 'the proportion of the smallest X or Y dimension'
544
545 if (radius < 0.0)
546 {
547 double smallest = 0.0;
548 if (width < height)
549 smallest = width;
550 else
551 smallest = height;
552 radius = (- radius * smallest);
553 }
554
555 long x2 = (x+width);
556 long y2 = (y+height);
557
558 (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
559 YLOG2DEV(y2), 2*XLOG2DEV(radius), 2*YLOG2DEV(radius));
560
561 CalcBoundingBox(x, y);
562 CalcBoundingBox(x2, y2);
563 }
564
565 void wxDC::DoDrawEllipse(long x, long y, long width, long height)
566 {
567 long x2 = (x+width);
568 long y2 = (y+height);
569
570 (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
571
572 CalcBoundingBox(x, y);
573 CalcBoundingBox(x2, y2);
574 }
575
576 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
577 void wxDC::DoDrawEllipticArc(long x,long y,long w,long h,double sa,double ea)
578 {
579 long x2 = (x+w);
580 long y2 = (y+h);
581
582 const double deg2rad = 3.14159265359 / 180.0;
583 int rx1 = XLOG2DEV(x+w/2);
584 int ry1 = YLOG2DEV(y+h/2);
585 int rx2 = rx1;
586 int ry2 = ry1;
587 rx1 += (int)(100.0 * abs(w) * cos(sa * deg2rad));
588 ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa * deg2rad));
589 rx2 += (int)(100.0 * abs(w) * cos(ea * deg2rad));
590 ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea * deg2rad));
591
592 // draw pie with NULL_PEN first and then outline otherwise a line is
593 // drawn from the start and end points to the centre
594 HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
595 if (m_signY > 0)
596 {
597 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
598 rx1, ry1, rx2, ry2);
599 }
600 else
601 {
602 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
603 rx1, ry1-1, rx2, ry2-1);
604 }
605 ::SelectObject(GetHdc(), orig_pen);
606 (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
607 rx1, ry1, rx2, ry2);
608
609 CalcBoundingBox(x, y);
610 CalcBoundingBox(x2, y2);
611 }
612
613 void wxDC::DoDrawIcon(const wxIcon& icon, long x, long y)
614 {
615 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
616 ::DrawIconEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (HICON) icon.GetHICON(),
617 icon.GetWidth(), icon.GetHeight(), 0, 0, DI_NORMAL);
618 #else
619 ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (HICON) icon.GetHICON());
620 #endif
621
622 CalcBoundingBox(x, y);
623 CalcBoundingBox(x+icon.GetWidth(), y+icon.GetHeight());
624 }
625
626 void wxDC::DoDrawBitmap( const wxBitmap &bmp, long x, long y, bool useMask )
627 {
628 if (!bmp.Ok())
629 return;
630
631 // If we're not drawing transparently, and not drawing to a printer,
632 // optimize this function to use Windows functions.
633 if (!useMask && !IsKindOf(CLASSINFO(wxPrinterDC)))
634 {
635 HDC cdc = GetHdc();
636 HDC memdc = ::CreateCompatibleDC( cdc );
637 HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
638 ::SelectObject( memdc, hbitmap );
639 ::BitBlt( cdc, x, y, bmp.GetWidth(), bmp.GetHeight(), memdc, 0, 0, SRCCOPY);
640 ::SelectObject( memdc, 0 );
641 ::DeleteDC( memdc );
642 }
643 else
644 {
645 // Rather than reproduce wxDC::Blit, let's do it at the wxWin API level
646 wxMemoryDC memDC;
647 memDC.SelectObject(bmp);
648
649 /* Not sure if we need this. The mask should leave the
650 * masked areas as per the original background of this DC.
651 */
652 /*
653 // There might be transparent areas, so make these
654 // the same colour as this DC
655 memDC.SetBackground(* GetBackground());
656 memDC.Clear();
657 */
658
659 Blit(x, y, bmp.GetWidth(), bmp.GetHeight(), & memDC, 0, 0, wxCOPY, useMask);
660
661 memDC.SelectObject(wxNullBitmap);
662 }
663 }
664
665 void wxDC::DoDrawText(const wxString& text, long x, long y)
666 {
667 if (m_textForegroundColour.Ok())
668 SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
669
670 DWORD old_background = 0;
671 if (m_textBackgroundColour.Ok())
672 {
673 old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
674 }
675
676 if (m_backgroundMode == wxTRANSPARENT)
677 SetBkMode(GetHdc(), TRANSPARENT);
678 else
679 SetBkMode(GetHdc(), OPAQUE);
680
681 (void)TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (char *) (const char *)text, strlen((const char *)text));
682
683 if (m_textBackgroundColour.Ok())
684 (void)SetBkColor(GetHdc(), old_background);
685
686 CalcBoundingBox(x, y);
687
688 long w, h;
689 GetTextExtent(text, &w, &h);
690 CalcBoundingBox((x + w), (y + h));
691 }
692
693 // ---------------------------------------------------------------------------
694 // set GDI objects
695 // ---------------------------------------------------------------------------
696
697 void wxDC::SetPalette(const wxPalette& palette)
698 {
699 // Set the old object temporarily, in case the assignment deletes an object
700 // that's not yet selected out.
701 if (m_oldPalette)
702 {
703 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
704 m_oldPalette = 0;
705 }
706
707 m_palette = palette;
708
709 if (!m_palette.Ok())
710 {
711 // Setting a NULL colourmap is a way of restoring
712 // the original colourmap
713 if (m_oldPalette)
714 {
715 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
716 m_oldPalette = 0;
717 }
718
719 return;
720 }
721
722 if (m_palette.Ok() && m_palette.GetHPALETTE())
723 {
724 HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
725 if (!m_oldPalette)
726 m_oldPalette = (WXHPALETTE) oldPal;
727
728 ::RealizePalette(GetHdc());
729 }
730 }
731
732 void wxDC::SetFont(const wxFont& the_font)
733 {
734 // Set the old object temporarily, in case the assignment deletes an object
735 // that's not yet selected out.
736 if (m_oldFont)
737 {
738 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
739 m_oldFont = 0;
740 }
741
742 m_font = the_font;
743
744 if (!the_font.Ok())
745 {
746 if (m_oldFont)
747 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
748 m_oldFont = 0;
749 }
750
751 if (m_font.Ok() && m_font.GetResourceHandle())
752 {
753 HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
754 if (f == (HFONT) NULL)
755 {
756 wxLogDebug("::SelectObject failed in wxDC::SetFont.");
757 }
758 if (!m_oldFont)
759 m_oldFont = (WXHFONT) f;
760 }
761 }
762
763 void wxDC::SetPen(const wxPen& pen)
764 {
765 // Set the old object temporarily, in case the assignment deletes an object
766 // that's not yet selected out.
767 if (m_oldPen)
768 {
769 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
770 m_oldPen = 0;
771 }
772
773 m_pen = pen;
774
775 if (!m_pen.Ok())
776 {
777 if (m_oldPen)
778 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
779 m_oldPen = 0;
780 }
781
782 if (m_pen.Ok())
783 {
784 if (m_pen.GetResourceHandle())
785 {
786 HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
787 if (!m_oldPen)
788 m_oldPen = (WXHPEN) p;
789 }
790 }
791 }
792
793 void wxDC::SetBrush(const wxBrush& brush)
794 {
795 // Set the old object temporarily, in case the assignment deletes an object
796 // that's not yet selected out.
797 if (m_oldBrush)
798 {
799 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
800 m_oldBrush = 0;
801 }
802
803 m_brush = brush;
804
805 if (!m_brush.Ok())
806 {
807 if (m_oldBrush)
808 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
809 m_oldBrush = 0;
810 }
811
812 if (m_brush.Ok())
813 {
814 if (m_brush.GetResourceHandle())
815 {
816 HBRUSH b = 0;
817 b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
818 if (!m_oldBrush)
819 m_oldBrush = (WXHBRUSH) b;
820 }
821 }
822 }
823
824 void wxDC::SetBackground(const wxBrush& brush)
825 {
826 m_backgroundBrush = brush;
827
828 if (!m_backgroundBrush.Ok())
829 return;
830
831 if (m_canvas)
832 {
833 bool customColours = TRUE;
834 // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
835 // change background colours from the control-panel specified colours.
836 if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
837 customColours = FALSE;
838
839 if (customColours)
840 {
841 if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
842 {
843 m_canvas->SetTransparent(TRUE);
844 }
845 else
846 {
847 // New behaviour, 10/2/99: setting the background brush of a DC
848 // doesn't affect the window background colour. However,
849 // I'm leaving in the transparency setting because it's needed by
850 // various controls (e.g. wxStaticText) to determine whether to draw
851 // transparently or not. TODO: maybe this should be a new function
852 // wxWindow::SetTransparency(). Should that apply to the child itself, or the
853 // parent?
854 // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
855 m_canvas->SetTransparent(FALSE);
856 }
857 }
858 }
859 COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
860 {
861 (void)SetBkColor(GetHdc(), new_color);
862 }
863 }
864
865 void wxDC::SetBackgroundMode(int mode)
866 {
867 m_backgroundMode = mode;
868
869 if (m_backgroundMode == wxTRANSPARENT)
870 ::SetBkMode(GetHdc(), TRANSPARENT);
871 else
872 ::SetBkMode(GetHdc(), OPAQUE);
873 }
874
875 void wxDC::SetLogicalFunction(int function)
876 {
877 m_logicalFunction = function;
878
879 SetRop((WXHDC) m_hDC);
880 }
881
882 void wxDC::SetRop(WXHDC dc)
883 {
884 if (!dc || m_logicalFunction < 0)
885 return;
886
887 int c_rop;
888 // These may be wrong
889 switch (m_logicalFunction)
890 {
891 // case wxXOR: c_rop = R2_XORPEN; break;
892 case wxXOR: c_rop = R2_NOTXORPEN; break;
893 case wxINVERT: c_rop = R2_NOT; break;
894 case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
895 case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
896 case wxCLEAR: c_rop = R2_WHITE; break;
897 case wxSET: c_rop = R2_BLACK; break;
898 case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
899 case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
900 case wxAND: c_rop = R2_MASKPEN; break;
901 case wxOR: c_rop = R2_MERGEPEN; break;
902 case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
903 case wxEQUIV:
904 case wxNAND:
905 case wxCOPY:
906 default:
907 c_rop = R2_COPYPEN; break;
908 }
909 SetROP2((HDC) dc, c_rop);
910 }
911
912 bool wxDC::StartDoc(const wxString& message)
913 {
914 // We might be previewing, so return TRUE to let it continue.
915 return TRUE;
916 }
917
918 void wxDC::EndDoc()
919 {
920 }
921
922 void wxDC::StartPage()
923 {
924 }
925
926 void wxDC::EndPage()
927 {
928 }
929
930 // ---------------------------------------------------------------------------
931 // text metrics
932 // ---------------------------------------------------------------------------
933
934 long wxDC::GetCharHeight() const
935 {
936 TEXTMETRIC lpTextMetric;
937
938 GetTextMetrics(GetHdc(), &lpTextMetric);
939
940 return YDEV2LOGREL(lpTextMetric.tmHeight);
941 }
942
943 long wxDC::GetCharWidth() const
944 {
945 TEXTMETRIC lpTextMetric;
946
947 GetTextMetrics(GetHdc(), &lpTextMetric);
948
949 return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
950 }
951
952 void wxDC::GetTextExtent(const wxString& string, long *x, long *y,
953 long *descent, long *externalLeading,
954 wxFont *theFont) const
955 {
956 wxFont *fontToUse = (wxFont*) theFont;
957 if (!fontToUse)
958 fontToUse = (wxFont*) &m_font;
959
960 SIZE sizeRect;
961 TEXTMETRIC tm;
962
963 GetTextExtentPoint(GetHdc(), (char *)(const char *) string, strlen((char *)(const char *) string), &sizeRect);
964 GetTextMetrics(GetHdc(), &tm);
965
966 if (x) *x = XDEV2LOGREL(sizeRect.cx);
967 if (y) *y = YDEV2LOGREL(sizeRect.cy);
968 if (descent) *descent = tm.tmDescent;
969 if (externalLeading) *externalLeading = tm.tmExternalLeading;
970 }
971
972 void wxDC::SetMapMode(int mode)
973 {
974 m_mappingMode = mode;
975
976 int pixel_width = 0;
977 int pixel_height = 0;
978 int mm_width = 0;
979 int mm_height = 0;
980
981 pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
982 pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
983 mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
984 mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
985
986 if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
987 {
988 return;
989 }
990
991 double mm2pixelsX = pixel_width/mm_width;
992 double mm2pixelsY = pixel_height/mm_height;
993
994 switch (mode)
995 {
996 case wxMM_TWIPS:
997 {
998 m_logicalScaleX = (twips2mm * mm2pixelsX);
999 m_logicalScaleY = (twips2mm * mm2pixelsY);
1000 break;
1001 }
1002 case wxMM_POINTS:
1003 {
1004 m_logicalScaleX = (pt2mm * mm2pixelsX);
1005 m_logicalScaleY = (pt2mm * mm2pixelsY);
1006 break;
1007 }
1008 case wxMM_METRIC:
1009 {
1010 m_logicalScaleX = mm2pixelsX;
1011 m_logicalScaleY = mm2pixelsY;
1012 break;
1013 }
1014 case wxMM_LOMETRIC:
1015 {
1016 m_logicalScaleX = (mm2pixelsX/10.0);
1017 m_logicalScaleY = (mm2pixelsY/10.0);
1018 break;
1019 }
1020 default:
1021 case wxMM_TEXT:
1022 {
1023 m_logicalScaleX = 1.0;
1024 m_logicalScaleY = 1.0;
1025 break;
1026 }
1027 }
1028
1029 if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
1030 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1031
1032 SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1033 m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
1034 m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
1035 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
1036 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1037 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1038 }
1039
1040 void wxDC::SetUserScale(double x, double y)
1041 {
1042 m_userScaleX = x;
1043 m_userScaleY = y;
1044
1045 SetMapMode(m_mappingMode);
1046 }
1047
1048 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1049 {
1050 m_signX = xLeftRight ? 1 : -1;
1051 m_signY = yBottomUp ? -1 : 1;
1052
1053 SetMapMode(m_mappingMode);
1054 }
1055
1056 void wxDC::SetSystemScale(double x, double y)
1057 {
1058 m_scaleX = x;
1059 m_scaleY = y;
1060
1061 SetMapMode(m_mappingMode);
1062 }
1063
1064 void wxDC::SetLogicalOrigin(long x, long y)
1065 {
1066 m_logicalOriginX = x;
1067 m_logicalOriginY = y;
1068
1069 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1070 }
1071
1072 void wxDC::SetDeviceOrigin(long x, long y)
1073 {
1074 m_deviceOriginX = x;
1075 m_deviceOriginY = y;
1076
1077 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1078 }
1079
1080 // ---------------------------------------------------------------------------
1081 // coordinates transformations
1082 // ---------------------------------------------------------------------------
1083
1084 long wxDCBase::DeviceToLogicalX(long x) const
1085 {
1086 return (long) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1087 }
1088
1089 long wxDCBase::DeviceToLogicalXRel(long x) const
1090 {
1091 return (long) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1092 }
1093
1094 long wxDCBase::DeviceToLogicalY(long y) const
1095 {
1096 return (long) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1097 }
1098
1099 long wxDCBase::DeviceToLogicalYRel(long y) const
1100 {
1101 return (long) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1102 }
1103
1104 long wxDCBase::LogicalToDeviceX(long x) const
1105 {
1106 return (long) (floor((x) - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1107 }
1108
1109 long wxDCBase::LogicalToDeviceXRel(long x) const
1110 {
1111 return (long) (floor(x)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1112 }
1113
1114 long wxDCBase::LogicalToDeviceY(long y) const
1115 {
1116 return (long) (floor((y) - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1117 }
1118
1119 long wxDCBase::LogicalToDeviceYRel(long y) const
1120 {
1121 return (long) (floor(y)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1122 }
1123
1124 // ---------------------------------------------------------------------------
1125 // bit blit
1126 // ---------------------------------------------------------------------------
1127 bool wxDC::DoBlit(long xdest, long ydest, long width, long height,
1128 wxDC *source, long xsrc, long ysrc, int rop, bool useMask)
1129 {
1130 long xdest1 = xdest;
1131 long ydest1 = ydest;
1132 long xsrc1 = xsrc;
1133 long ysrc1 = ysrc;
1134
1135 // Chris Breeze 18/5/98: use text foreground/background colours
1136 // when blitting from 1-bit bitmaps
1137 COLORREF old_textground = ::GetTextColor(GetHdc());
1138 COLORREF old_background = ::GetBkColor(GetHdc());
1139 if (m_textForegroundColour.Ok())
1140 {
1141 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1142 }
1143 if (m_textBackgroundColour.Ok())
1144 {
1145 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1146 }
1147
1148 DWORD dwRop = rop == wxCOPY ? SRCCOPY :
1149 rop == wxCLEAR ? WHITENESS :
1150 rop == wxSET ? BLACKNESS :
1151 rop == wxINVERT ? DSTINVERT :
1152 rop == wxAND ? MERGECOPY :
1153 rop == wxOR ? MERGEPAINT :
1154 rop == wxSRC_INVERT ? NOTSRCCOPY :
1155 rop == wxXOR ? SRCINVERT :
1156 rop == wxOR_REVERSE ? MERGEPAINT :
1157 rop == wxAND_REVERSE ? SRCERASE :
1158 rop == wxSRC_OR ? SRCPAINT :
1159 rop == wxSRC_AND ? SRCAND :
1160 SRCCOPY;
1161
1162 bool success = TRUE;
1163 if (useMask && source->m_selectedBitmap.Ok() && source->m_selectedBitmap.GetMask())
1164 {
1165
1166 #if 0 // __WIN32__
1167 // Not implemented under Win95 (or maybe a specific device?)
1168 if (MaskBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1169 (HDC) source->m_hDC, xsrc1, ysrc1, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap(),
1170 0, 0, 0xAACC0020))
1171 {
1172 // Success
1173 }
1174 else
1175 #endif
1176 {
1177 // Old code
1178 #if 0
1179 HDC dc_mask = CreateCompatibleDC((HDC) source->m_hDC);
1180 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1181 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1182 dc_mask, xsrc1, ysrc1, 0x00220326 /* NOTSRCAND */) != 0);
1183 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1184 (HDC) source->m_hDC, xsrc1, ysrc1, SRCPAINT) != 0);
1185 ::SelectObject(dc_mask, 0);
1186 ::DeleteDC(dc_mask);
1187 #endif
1188 // New code from Chris Breeze, 15/7/98
1189 // Blit bitmap with mask
1190
1191 if (IsKindOf(CLASSINFO(wxPrinterDC)))
1192 {
1193 // If we are printing source colours are screen colours
1194 // not printer colours and so we need copy the bitmap
1195 // pixel by pixel.
1196 RECT rect;
1197 HDC dc_mask = ::CreateCompatibleDC((HDC) source->m_hDC);
1198 HDC dc_src = (HDC) source->m_hDC;
1199
1200 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1201 for (int x = 0; x < width; x++)
1202 {
1203 for (int y = 0; y < height; y++)
1204 {
1205 COLORREF cref = ::GetPixel(dc_mask, x, y);
1206 if (cref)
1207 {
1208 HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
1209 rect.left = xdest1 + x; rect.right = rect.left + 1;
1210 rect.top = ydest1 + y; rect.bottom = rect.top + 1;
1211 ::FillRect(GetHdc(), &rect, brush);
1212 ::DeleteObject(brush);
1213 }
1214 }
1215 }
1216 ::SelectObject(dc_mask, 0);
1217 ::DeleteDC(dc_mask);
1218 }
1219 else
1220 {
1221 // create a temp buffer bitmap and DCs to access it and the mask
1222 HDC dc_mask = ::CreateCompatibleDC((HDC) source->m_hDC);
1223 HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
1224 HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
1225 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1226 ::SelectObject(dc_buffer, buffer_bmap);
1227
1228 // copy dest to buffer
1229 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1230 GetHdc(), xdest1, ydest1, SRCCOPY);
1231
1232 // copy src to buffer using selected raster op
1233 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1234 (HDC) source->m_hDC, xsrc1, ysrc1, dwRop);
1235
1236 // set masked area in buffer to BLACK (pixel value 0)
1237 COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
1238 COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
1239 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1240 dc_mask, xsrc1, ysrc1, SRCAND);
1241
1242 // set unmasked area in dest to BLACK
1243 ::SetBkColor(GetHdc(), RGB(0, 0, 0));
1244 ::SetTextColor(GetHdc(), RGB(255, 255, 255));
1245 ::BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1246 dc_mask, xsrc1, ysrc1, SRCAND);
1247 ::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
1248 ::SetTextColor(GetHdc(), prevCol);
1249
1250 // OR buffer to dest
1251 success = (::BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1252 dc_buffer, 0, 0, SRCPAINT) != 0);
1253
1254 // tidy up temporary DCs and bitmap
1255 ::SelectObject(dc_mask, 0);
1256 ::DeleteDC(dc_mask);
1257 ::SelectObject(dc_buffer, 0);
1258 ::DeleteDC(dc_buffer);
1259 ::DeleteObject(buffer_bmap);
1260 }
1261 }
1262 }
1263 else
1264 {
1265 if (IsKindOf(CLASSINFO(wxPrinterDC)))
1266 {
1267 // If we are printing, source colours are screen colours
1268 // not printer colours and so we need copy the bitmap
1269 // pixel by pixel.
1270 HDC dc_src = (HDC) source->m_hDC;
1271 RECT rect;
1272 for (int x = 0; x < width; x++)
1273 {
1274 for (int y = 0; y < height; y++)
1275 {
1276 HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
1277 rect.left = xdest1 + x; rect.right = rect.left + 1;
1278 rect.top = ydest1 + y; rect.bottom = rect.top + 1;
1279 ::FillRect(GetHdc(), &rect, brush);
1280 ::DeleteObject(brush);
1281 }
1282 }
1283 }
1284 else
1285 {
1286 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height, (HDC) source->m_hDC,
1287 xsrc1, ysrc1, dwRop) != 0);
1288 }
1289 }
1290 ::SetTextColor(GetHdc(), old_textground);
1291 ::SetBkColor(GetHdc(), old_background);
1292
1293 return success;
1294 }
1295
1296 void wxDC::DoGetSize(int *w, int *h) const
1297 {
1298 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
1299 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
1300 }
1301
1302 void wxDC::DoGetSizeMM(int *w, int *h) const
1303 {
1304 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
1305 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1306 }
1307
1308 wxSize wxDC::GetPPI() const
1309 {
1310 int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
1311 int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
1312
1313 return wxSize(x, y);
1314 }
1315
1316 // For use by wxWindows only, unless custom units are required.
1317 void wxDC::SetLogicalScale(double x, double y)
1318 {
1319 m_logicalScaleX = x;
1320 m_logicalScaleY = y;
1321 }
1322
1323 #if WXWIN_COMPATIBILITY
1324 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1325 float *descent, float *externalLeading,
1326 wxFont *theFont, bool use16bit) const
1327 {
1328 long x1, y1, descent1, externalLeading1;
1329 GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1330 *x = x1; *y = y1;
1331 if (descent)
1332 *descent = descent1;
1333 if (externalLeading)
1334 *externalLeading = externalLeading1;
1335 }
1336 #endif
1337
1338 // ---------------------------------------------------------------------------
1339 // spline drawing code
1340 // ---------------------------------------------------------------------------
1341
1342 #if wxUSE_SPLINES
1343
1344 class wxSpline: public wxObject
1345 {
1346 public:
1347 int type;
1348 wxList *points;
1349
1350 wxSpline(wxList *list);
1351 void DeletePoints();
1352
1353 // Doesn't delete points
1354 ~wxSpline();
1355 };
1356
1357 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1358
1359 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1360 double a3, double b3, double a4, double b4);
1361 void wx_clear_stack();
1362 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1363 double *y3, double *x4, double *y4);
1364 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1365 double x4, double y4);
1366 static bool wx_spline_add_point(double x, double y);
1367 static void wx_spline_draw_point_array(wxDC *dc);
1368 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1369
1370 void wxDC::DoDrawSpline(wxList *list)
1371 {
1372 wxSpline spline(list);
1373
1374 wx_draw_open_spline(this, &spline);
1375 }
1376
1377 wxList wx_spline_point_list;
1378
1379 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1380 {
1381 wxPoint *p;
1382 double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1383 double x1, y1, x2, y2;
1384
1385 wxNode *node = spline->points->First();
1386 p = (wxPoint *)node->Data();
1387
1388 x1 = p->x;
1389 y1 = p->y;
1390
1391 node = node->Next();
1392 p = (wxPoint *)node->Data();
1393
1394 x2 = p->x;
1395 y2 = p->y;
1396 cx1 = (double)((x1 + x2) / 2);
1397 cy1 = (double)((y1 + y2) / 2);
1398 cx2 = (double)((cx1 + x2) / 2);
1399 cy2 = (double)((cy1 + y2) / 2);
1400
1401 wx_spline_add_point(x1, y1);
1402
1403 while ((node = node->Next()) != NULL)
1404 {
1405 p = (wxPoint *)node->Data();
1406 x1 = x2;
1407 y1 = y2;
1408 x2 = p->x;
1409 y2 = p->y;
1410 cx4 = (double)(x1 + x2) / 2;
1411 cy4 = (double)(y1 + y2) / 2;
1412 cx3 = (double)(x1 + cx4) / 2;
1413 cy3 = (double)(y1 + cy4) / 2;
1414
1415 wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1416
1417 cx1 = cx4;
1418 cy1 = cy4;
1419 cx2 = (double)(cx1 + x2) / 2;
1420 cy2 = (double)(cy1 + y2) / 2;
1421 }
1422
1423 wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1424 wx_spline_add_point(x2, y2);
1425
1426 wx_spline_draw_point_array(dc);
1427
1428 }
1429
1430 /********************* CURVES FOR SPLINES *****************************
1431
1432 The following spline drawing routine is from
1433
1434 "An Algorithm for High-Speed Curve Generation"
1435 by George Merrill Chaikin,
1436 Computer Graphics and Image Processing, 3, Academic Press,
1437 1974, 346-349.
1438
1439 and
1440
1441 "On Chaikin's Algorithm" by R. F. Riesenfeld,
1442 Computer Graphics and Image Processing, 4, Academic Press,
1443 1975, 304-310.
1444
1445 ***********************************************************************/
1446
1447 #define half(z1, z2) ((z1+z2)/2.0)
1448 #define THRESHOLD 5
1449
1450 /* iterative version */
1451
1452 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1453 double b4)
1454 {
1455 register double xmid, ymid;
1456 double x1, y1, x2, y2, x3, y3, x4, y4;
1457
1458 wx_clear_stack();
1459 wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1460
1461 while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1462 xmid = (double)half(x2, x3);
1463 ymid = (double)half(y2, y3);
1464 if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1465 fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1466 wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1467 wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1468 } else {
1469 wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1470 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1471 wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1472 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1473 }
1474 }
1475 }
1476
1477
1478 /* utilities used by spline drawing routines */
1479
1480
1481 typedef struct wx_spline_stack_struct {
1482 double x1, y1, x2, y2, x3, y3, x4, y4;
1483 }
1484 Stack;
1485
1486 #define SPLINE_STACK_DEPTH 20
1487 static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
1488 static Stack *wx_stack_top;
1489 static int wx_stack_count;
1490
1491 void wx_clear_stack()
1492 {
1493 wx_stack_top = wx_spline_stack;
1494 wx_stack_count = 0;
1495 }
1496
1497 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1498 {
1499 wx_stack_top->x1 = x1;
1500 wx_stack_top->y1 = y1;
1501 wx_stack_top->x2 = x2;
1502 wx_stack_top->y2 = y2;
1503 wx_stack_top->x3 = x3;
1504 wx_stack_top->y3 = y3;
1505 wx_stack_top->x4 = x4;
1506 wx_stack_top->y4 = y4;
1507 wx_stack_top++;
1508 wx_stack_count++;
1509 }
1510
1511 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1512 double *x3, double *y3, double *x4, double *y4)
1513 {
1514 if (wx_stack_count == 0)
1515 return (0);
1516 wx_stack_top--;
1517 wx_stack_count--;
1518 *x1 = wx_stack_top->x1;
1519 *y1 = wx_stack_top->y1;
1520 *x2 = wx_stack_top->x2;
1521 *y2 = wx_stack_top->y2;
1522 *x3 = wx_stack_top->x3;
1523 *y3 = wx_stack_top->y3;
1524 *x4 = wx_stack_top->x4;
1525 *y4 = wx_stack_top->y4;
1526 return (1);
1527 }
1528
1529 static bool wx_spline_add_point(double x, double y)
1530 {
1531 wxPoint *point = new wxPoint;
1532 point->x = (int) x;
1533 point->y = (int) y;
1534 wx_spline_point_list.Append((wxObject*)point);
1535 return TRUE;
1536 }
1537
1538 static void wx_spline_draw_point_array(wxDC *dc)
1539 {
1540 dc->DrawLines(&wx_spline_point_list, 0, 0);
1541 wxNode *node = wx_spline_point_list.First();
1542 while (node)
1543 {
1544 wxPoint *point = (wxPoint *)node->Data();
1545 delete point;
1546 delete node;
1547 node = wx_spline_point_list.First();
1548 }
1549 }
1550
1551 wxSpline::wxSpline(wxList *list)
1552 {
1553 points = list;
1554 }
1555
1556 wxSpline::~wxSpline()
1557 {
1558 }
1559
1560 void wxSpline::DeletePoints()
1561 {
1562 for(wxNode *node = points->First(); node; node = points->First())
1563 {
1564 wxPoint *point = (wxPoint *)node->Data();
1565 delete point;
1566 delete node;
1567 }
1568 delete points;
1569 }
1570
1571
1572 #endif // wxUSE_SPLINES
1573
wxWidgets (Impactor)