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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
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #ifndef WX_PRECOMP
32 #include "wx/window.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 #include "wx/log.h"
40 #include "wx/icon.h"
41 #endif
42
43 #include "wx/dcprint.h"
44
45 #include <string.h>
46 #include <math.h>
47
48 #if wxUSE_COMMON_DIALOGS
49 #include <commdlg.h>
50 #endif
51
52 #ifndef __WIN32__
53 #include <print.h>
54 #endif
55
56 #include "wx/msw/private.h"
57
58 #if !USE_SHARED_LIBRARY
59 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
60 #endif
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 // ---------------------------------------------------------------------------
72 // macros
73 // ---------------------------------------------------------------------------
74
75 // Logical to device
76 // Absolute
77 #define XLOG2DEV(x) (x)
78 #define YLOG2DEV(y) (y)
79
80 // Relative
81 #define XLOG2DEVREL(x) (x)
82 #define YLOG2DEVREL(y) (y)
83
84 // Device to logical
85 // Absolute
86 #define XDEV2LOG(x) (x)
87
88 #define YDEV2LOG(y) (y)
89
90 // Relative
91 #define XDEV2LOGREL(x) (x)
92 #define YDEV2LOGREL(y) (y)
93
94 /*
95 * Have the same macros as for XView but not for every operation:
96 * just for calculating window/viewport extent (a better way of scaling).
97 */
98
99 // Logical to device
100 // Absolute
101 #define MS_XLOG2DEV(x) LogicalToDevice(x)
102
103 #define MS_YLOG2DEV(y) LogicalToDevice(y)
104
105 // Relative
106 #define MS_XLOG2DEVREL(x) LogicalToDeviceXRel(x)
107 #define MS_YLOG2DEVREL(y) LogicalToDeviceYRel(y)
108
109 // Device to logical
110 // Absolute
111 #define MS_XDEV2LOG(x) DeviceToLogicalX(x)
112
113 #define MS_YDEV2LOG(y) DeviceToLogicalY(y)
114
115 // Relative
116 #define MS_XDEV2LOGREL(x) DeviceToLogicalXRel(x)
117 #define MS_YDEV2LOGREL(y) DeviceToLogicalYRel(y)
118
119 #define YSCALE(y) (yorigin - (y))
120
121 #define wx_round(a) (int)((a)+.5)
122
123 // ===========================================================================
124 // implementation
125 // ===========================================================================
126
127 // ---------------------------------------------------------------------------
128 // wxDC
129 // ---------------------------------------------------------------------------
130
131 // Default constructor
132 wxDC::wxDC()
133 {
134 m_canvas = NULL;
135
136 m_oldBitmap = 0;
137 m_oldPen = 0;
138 m_oldBrush = 0;
139 m_oldFont = 0;
140 m_oldPalette = 0;
141
142 m_bOwnsDC = FALSE;
143 m_hDC = 0;
144
145 m_windowExtX = VIEWPORT_EXTENT;
146 m_windowExtY = VIEWPORT_EXTENT;
147
148 m_hDCCount = 0;
149 }
150
151
152 wxDC::~wxDC()
153 {
154 if ( m_hDC != 0 ) {
155 SelectOldObjects(m_hDC);
156 if ( m_bOwnsDC ) {
157 if ( m_canvas == NULL )
158 ::DeleteDC(GetHdc());
159 else
160 ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
161 }
162 }
163
164 }
165
166 // This will select current objects out of the DC,
167 // which is what you have to do before deleting the
168 // DC.
169 void wxDC::SelectOldObjects(WXHDC dc)
170 {
171 if (dc)
172 {
173 if (m_oldBitmap)
174 {
175 ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
176 if (m_selectedBitmap.Ok())
177 {
178 m_selectedBitmap.SetSelectedInto(NULL);
179 }
180 }
181 m_oldBitmap = 0;
182 if (m_oldPen)
183 {
184 ::SelectObject((HDC) dc, (HPEN) m_oldPen);
185 }
186 m_oldPen = 0;
187 if (m_oldBrush)
188 {
189 ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
190 }
191 m_oldBrush = 0;
192 if (m_oldFont)
193 {
194 ::SelectObject((HDC) dc, (HFONT) m_oldFont);
195 }
196 m_oldFont = 0;
197 if (m_oldPalette)
198 {
199 ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
200 }
201 m_oldPalette = 0;
202 }
203
204 m_brush = wxNullBrush;
205 m_pen = wxNullPen;
206 m_palette = wxNullPalette;
207 m_font = wxNullFont;
208 m_backgroundBrush = wxNullBrush;
209 m_selectedBitmap = wxNullBitmap;
210 }
211
212 // ---------------------------------------------------------------------------
213 // clipping
214 // ---------------------------------------------------------------------------
215
216 void wxDC::DoSetClippingRegion(long cx, long cy, long cw, long ch)
217 {
218 m_clipping = TRUE;
219 m_clipX1 = (int)cx;
220 m_clipY1 = (int)cy;
221 m_clipX2 = (int)(cx + cw);
222 m_clipY2 = (int)(cy + ch);
223
224 DoClipping((WXHDC) m_hDC);
225 }
226
227 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
228 {
229 wxCHECK_RET( region.GetHRGN(), _T("invalid clipping region") );
230
231 wxRect box = region.GetBox();
232
233 m_clipping = TRUE;
234 m_clipX1 = box.x;
235 m_clipY1 = box.y;
236 m_clipX2 = box.x + box.width;
237 m_clipY2 = box.y + box.height;
238
239 #ifdef __WIN16__
240 SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
241 #else
242 ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
243 #endif
244 }
245
246 void wxDC::DoClipping(WXHDC dc)
247 {
248 if (m_clipping && dc)
249 {
250 IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
251 XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
252 }
253 }
254
255 void wxDC::DestroyClippingRegion()
256 {
257 if (m_clipping && m_hDC)
258 {
259 // TODO: this should restore the previous clipping region,
260 // so that OnPaint processing works correctly, and the update clipping region
261 // doesn't get destroyed after the first DestroyClippingRegion.
262 HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
263 SelectClipRgn(GetHdc(), rgn);
264 DeleteObject(rgn);
265 }
266 m_clipping = FALSE;
267 }
268
269 // ---------------------------------------------------------------------------
270 // query capabilities
271 // ---------------------------------------------------------------------------
272
273 bool wxDC::CanDrawBitmap() const
274 {
275 return TRUE;
276 }
277
278 bool wxDC::CanGetTextExtent() const
279 {
280 // What sort of display is it?
281 int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
282
283 return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
284 }
285
286 int wxDC::GetDepth() const
287 {
288 return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
289 }
290
291 // ---------------------------------------------------------------------------
292 // drawing
293 // ---------------------------------------------------------------------------
294
295 void wxDC::Clear()
296 {
297 RECT rect;
298 if (m_canvas)
299 GetClientRect((HWND) m_canvas->GetHWND(), &rect);
300 else if (m_selectedBitmap.Ok())
301 {
302 rect.left = 0; rect.top = 0;
303 rect.right = m_selectedBitmap.GetWidth();
304 rect.bottom = m_selectedBitmap.GetHeight();
305 }
306 (void) ::SetMapMode(GetHdc(), MM_TEXT);
307
308 DWORD colour = GetBkColor(GetHdc());
309 HBRUSH brush = CreateSolidBrush(colour);
310 FillRect(GetHdc(), &rect, brush);
311 DeleteObject(brush);
312
313 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
314 ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
315 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
316 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
317 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
318 }
319
320 void wxDC::DoFloodFill(long x, long y, const wxColour& col, int style)
321 {
322 (void)ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
323 col.GetPixel(),
324 style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
325 : FLOODFILLBORDER);
326
327 CalcBoundingBox(x, y);
328 }
329
330 bool wxDC::DoGetPixel(long x, long y, wxColour *col) const
331 {
332 // added by steve 29.12.94 (copied from DrawPoint)
333 // returns TRUE for pixels in the color of the current pen
334 // and FALSE for all other pixels colors
335 // if col is non-NULL return the color of the pixel
336
337 // get the color of the pixel
338 COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
339 // get the color of the pen
340 COLORREF pencolor = 0x00ffffff;
341 if (m_pen.Ok())
342 {
343 pencolor = m_pen.GetColour().GetPixel();
344 }
345
346 // return the color of the pixel
347 if(col)
348 col->Set(GetRValue(pixelcolor),GetGValue(pixelcolor),GetBValue(pixelcolor));
349
350 // check, if color of the pixels is the same as the color
351 // of the current pen
352 return(pixelcolor==pencolor);
353 }
354
355 void wxDC::DoCrossHair(long x, long y)
356 {
357 long x1 = x-VIEWPORT_EXTENT;
358 long y1 = y-VIEWPORT_EXTENT;
359 long x2 = x+VIEWPORT_EXTENT;
360 long y2 = y+VIEWPORT_EXTENT;
361
362 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
363 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
364
365 (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
366 (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
367
368 CalcBoundingBox(x1, y1);
369 CalcBoundingBox(x2, y2);
370 }
371
372 void wxDC::DoDrawLine(long x1, long y1, long x2, long y2)
373 {
374 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
375 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
376
377 /* MATTHEW: [6] New normalization */
378 #if WX_STANDARD_GRAPHICS
379 (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
380 #endif
381
382 CalcBoundingBox(x1, y1);
383 CalcBoundingBox(x2, y2);
384 }
385
386 void wxDC::DoDrawArc(long x1,long y1,long x2,long y2, long xc, long yc)
387 {
388 double dx = xc-x1;
389 double dy = yc-y1;
390 double radius = (double)sqrt(dx*dx+dy*dy) ;;
391 if (x1==x2 && x2==y2)
392 {
393 DrawEllipse(xc,yc,(long)(radius*2.0),(long)(radius*2.0));
394 return;
395 }
396
397 long xx1 = XLOG2DEV(x1);
398 long yy1 = YLOG2DEV(y1);
399 long xx2 = XLOG2DEV(x2);
400 long yy2 = YLOG2DEV(y2);
401 long xxc = XLOG2DEV(xc);
402 long yyc = YLOG2DEV(yc);
403 long ray = (long) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
404
405 (void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
406 long xxx1 = (long) (xxc-ray);
407 long yyy1 = (long) (yyc-ray);
408 long xxx2 = (long) (xxc+ray);
409 long yyy2 = (long) (yyc+ray);
410 if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
411 {
412 // Have to add 1 to bottom-right corner of rectangle
413 // to make semi-circles look right (crooked line otherwise).
414 // Unfortunately this is not a reliable method, depends
415 // on the size of shape.
416 // TODO: figure out why this happens!
417 Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
418 xx1,yy1,xx2,yy2);
419 }
420 else
421 Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
422 xx1,yy1,xx2,yy2);
423
424 CalcBoundingBox((xc-radius), (yc-radius));
425 CalcBoundingBox((xc+radius), (yc+radius));
426 }
427
428 void wxDC::DoDrawPoint(long x, long y)
429 {
430 COLORREF color = 0x00ffffff;
431 if (m_pen.Ok())
432 {
433 color = m_pen.GetColour().GetPixel();
434 }
435
436 SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
437
438 CalcBoundingBox(x, y);
439 }
440
441 void wxDC::DoDrawPolygon(int n, wxPoint points[], long xoffset, long yoffset,int fillStyle)
442 {
443 // Do things less efficiently if we have offsets
444 if (xoffset != 0 || yoffset != 0)
445 {
446 POINT *cpoints = new POINT[n];
447 int i;
448 for (i = 0; i < n; i++)
449 {
450 cpoints[i].x = (int)(points[i].x + xoffset);
451 cpoints[i].y = (int)(points[i].y + yoffset);
452
453 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
454 }
455 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
456 (void)Polygon(GetHdc(), cpoints, n);
457 SetPolyFillMode(GetHdc(),prev);
458 delete[] cpoints;
459 }
460 else
461 {
462 int i;
463 for (i = 0; i < n; i++)
464 CalcBoundingBox(points[i].x, points[i].y);
465
466 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
467 (void)Polygon(GetHdc(), (POINT*) points, n);
468 SetPolyFillMode(GetHdc(),prev);
469 }
470 }
471
472 void wxDC::DoDrawLines(int n, wxPoint points[], long xoffset, long yoffset)
473 {
474 // Do things less efficiently if we have offsets
475 if (xoffset != 0 || yoffset != 0)
476 {
477 POINT *cpoints = new POINT[n];
478 int i;
479 for (i = 0; i < n; i++)
480 {
481 cpoints[i].x = (int)(points[i].x + xoffset);
482 cpoints[i].y = (int)(points[i].y + yoffset);
483
484 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
485 }
486 (void)Polyline(GetHdc(), cpoints, n);
487 delete[] cpoints;
488 }
489 else
490 {
491 int i;
492 for (i = 0; i < n; i++)
493 CalcBoundingBox(points[i].x, points[i].y);
494
495 (void)Polyline(GetHdc(), (POINT*) points, n);
496 }
497 }
498
499 void wxDC::DoDrawRectangle(long x, long y, long width, long height)
500 {
501 long x2 = x + width;
502 long y2 = y + height;
503
504 /* MATTHEW: [6] new normalization */
505 #if WX_STANDARD_GRAPHICS
506 bool do_brush, do_pen;
507
508 do_brush = m_brush.Ok() && m_brush.GetStyle() != wxTRANSPARENT;
509 do_pen = m_pen.Ok() && m_pen.GetStyle() != wxTRANSPARENT;
510
511 if (do_brush) {
512 HPEN orig_pen = NULL;
513
514 if (do_pen || !m_pen.Ok())
515 orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
516
517 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
518 XLOG2DEV(x2) + 1, YLOG2DEV(y2) + 1);
519
520 if (do_pen || !m_pen.Ok())
521 ::SelectObject(GetHdc() , orig_pen);
522 }
523 if (do_pen) {
524 HBRUSH orig_brush = NULL;
525
526 if (do_brush || !m_brush.Ok())
527 orig_brush = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH) ::GetStockObject(NULL_BRUSH));
528
529 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
530 XLOG2DEV(x2), YLOG2DEV(y2));
531
532 if (do_brush || !m_brush.Ok())
533 ::SelectObject(GetHdc(), orig_brush);
534 }
535 #else
536 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
537 #endif
538
539 CalcBoundingBox(x, y);
540 CalcBoundingBox(x2, y2);
541 }
542
543 void wxDC::DoDrawRoundedRectangle(long x, long y, long width, long height, double radius)
544 {
545 // Now, a negative radius value is interpreted to mean
546 // 'the proportion of the smallest X or Y dimension'
547
548 if (radius < 0.0)
549 {
550 double smallest = 0.0;
551 if (width < height)
552 smallest = width;
553 else
554 smallest = height;
555 radius = (- radius * smallest);
556 }
557
558 long x2 = (x+width);
559 long y2 = (y+height);
560
561 (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
562 YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
563
564 CalcBoundingBox(x, y);
565 CalcBoundingBox(x2, y2);
566 }
567
568 void wxDC::DoDrawEllipse(long x, long y, long width, long height)
569 {
570 long x2 = (x+width);
571 long y2 = (y+height);
572
573 (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
574
575 CalcBoundingBox(x, y);
576 CalcBoundingBox(x2, y2);
577 }
578
579 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
580 void wxDC::DoDrawEllipticArc(long x,long y,long w,long h,double sa,double ea)
581 {
582 long x2 = (x+w);
583 long y2 = (y+h);
584
585 const double deg2rad = 3.14159265359 / 180.0;
586 int rx1 = XLOG2DEV(x+w/2);
587 int ry1 = YLOG2DEV(y+h/2);
588 int rx2 = rx1;
589 int ry2 = ry1;
590 rx1 += (int)(100.0 * abs(w) * cos(sa * deg2rad));
591 ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa * deg2rad));
592 rx2 += (int)(100.0 * abs(w) * cos(ea * deg2rad));
593 ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea * deg2rad));
594
595 // draw pie with NULL_PEN first and then outline otherwise a line is
596 // drawn from the start and end points to the centre
597 HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
598 if (m_signY > 0)
599 {
600 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
601 rx1, ry1, rx2, ry2);
602 }
603 else
604 {
605 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
606 rx1, ry1-1, rx2, ry2-1);
607 }
608 ::SelectObject(GetHdc(), orig_pen);
609 (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
610 rx1, ry1, rx2, ry2);
611
612 CalcBoundingBox(x, y);
613 CalcBoundingBox(x2, y2);
614 }
615
616 void wxDC::DoDrawIcon(const wxIcon& icon, long x, long y)
617 {
618 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
619 ::DrawIconEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (HICON) icon.GetHICON(),
620 icon.GetWidth(), icon.GetHeight(), 0, 0, DI_NORMAL);
621 #else
622 ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (HICON) icon.GetHICON());
623 #endif
624
625 CalcBoundingBox(x, y);
626 CalcBoundingBox(x+icon.GetWidth(), y+icon.GetHeight());
627 }
628
629 void wxDC::DoDrawBitmap( const wxBitmap &bmp, long x, long y, bool useMask )
630 {
631 if (!bmp.Ok())
632 return;
633
634 // If we're not drawing transparently, and not drawing to a printer,
635 // optimize this function to use Windows functions.
636 if (!useMask && !IsKindOf(CLASSINFO(wxPrinterDC)))
637 {
638 HDC cdc = GetHdc();
639 HDC memdc = ::CreateCompatibleDC( cdc );
640 HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
641 ::SelectObject( memdc, hbitmap );
642 ::BitBlt( cdc, x, y, bmp.GetWidth(), bmp.GetHeight(), memdc, 0, 0, SRCCOPY);
643 ::DeleteDC( memdc );
644 }
645 else
646 {
647 // Rather than reproduce wxDC::Blit, let's do it at the wxWin API level
648 wxMemoryDC memDC;
649 memDC.SelectObject(bmp);
650
651 /* Not sure if we need this. The mask should leave the
652 * masked areas as per the original background of this DC.
653 */
654 /*
655 // There might be transparent areas, so make these
656 // the same colour as this DC
657 memDC.SetBackground(* GetBackground());
658 memDC.Clear();
659 */
660
661 Blit(x, y, bmp.GetWidth(), bmp.GetHeight(), & memDC, 0, 0, wxCOPY, useMask);
662
663 memDC.SelectObject(wxNullBitmap);
664 }
665 }
666
667 void wxDC::DoDrawText(const wxString& text, long x, long y)
668 {
669 if (m_textForegroundColour.Ok())
670 SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
671
672 DWORD old_background = 0;
673 if (m_textBackgroundColour.Ok())
674 {
675 old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
676 }
677
678 if (m_backgroundMode == wxTRANSPARENT)
679 SetBkMode(GetHdc(), TRANSPARENT);
680 else
681 SetBkMode(GetHdc(), OPAQUE);
682
683 (void)TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (char *) (const char *)text, strlen((const char *)text));
684
685 if (m_textBackgroundColour.Ok())
686 (void)SetBkColor(GetHdc(), old_background);
687
688 CalcBoundingBox(x, y);
689
690 long w, h;
691 GetTextExtent(text, &w, &h);
692 CalcBoundingBox((x + w), (y + h));
693 }
694
695 // ---------------------------------------------------------------------------
696 // set GDI objects
697 // ---------------------------------------------------------------------------
698
699 void wxDC::SetPalette(const wxPalette& palette)
700 {
701 // Set the old object temporarily, in case the assignment deletes an object
702 // that's not yet selected out.
703 if (m_oldPalette)
704 {
705 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
706 m_oldPalette = 0;
707 }
708
709 m_palette = palette;
710
711 if (!m_palette.Ok())
712 {
713 // Setting a NULL colourmap is a way of restoring
714 // the original colourmap
715 if (m_oldPalette)
716 {
717 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
718 m_oldPalette = 0;
719 }
720
721 return;
722 }
723
724 if (m_palette.Ok() && m_palette.GetHPALETTE())
725 {
726 HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
727 if (!m_oldPalette)
728 m_oldPalette = (WXHPALETTE) oldPal;
729
730 ::RealizePalette(GetHdc());
731 }
732 }
733
734 void wxDC::SetFont(const wxFont& the_font)
735 {
736 // Set the old object temporarily, in case the assignment deletes an object
737 // that's not yet selected out.
738 if (m_oldFont)
739 {
740 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
741 m_oldFont = 0;
742 }
743
744 m_font = the_font;
745
746 if (!the_font.Ok())
747 {
748 if (m_oldFont)
749 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
750 m_oldFont = 0;
751 }
752
753 if (m_font.Ok() && m_font.GetResourceHandle())
754 {
755 HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
756 if (f == (HFONT) NULL)
757 {
758 wxLogDebug("::SelectObject failed in wxDC::SetFont.");
759 }
760 if (!m_oldFont)
761 m_oldFont = (WXHFONT) f;
762 }
763 }
764
765 void wxDC::SetPen(const wxPen& pen)
766 {
767 // Set the old object temporarily, in case the assignment deletes an object
768 // that's not yet selected out.
769 if (m_oldPen)
770 {
771 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
772 m_oldPen = 0;
773 }
774
775 m_pen = pen;
776
777 if (!m_pen.Ok())
778 {
779 if (m_oldPen)
780 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
781 m_oldPen = 0;
782 }
783
784 if (m_pen.Ok())
785 {
786 if (m_pen.GetResourceHandle())
787 {
788 HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
789 if (!m_oldPen)
790 m_oldPen = (WXHPEN) p;
791 }
792 }
793 }
794
795 void wxDC::SetBrush(const wxBrush& brush)
796 {
797 // Set the old object temporarily, in case the assignment deletes an object
798 // that's not yet selected out.
799 if (m_oldBrush)
800 {
801 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
802 m_oldBrush = 0;
803 }
804
805 m_brush = brush;
806
807 if (!m_brush.Ok())
808 {
809 if (m_oldBrush)
810 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
811 m_oldBrush = 0;
812 }
813
814 if (m_brush.Ok())
815 {
816 if (m_brush.GetResourceHandle())
817 {
818 HBRUSH b = 0;
819 b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
820 if (!m_oldBrush)
821 m_oldBrush = (WXHBRUSH) b;
822 }
823 }
824 }
825
826 void wxDC::SetBackground(const wxBrush& brush)
827 {
828 m_backgroundBrush = brush;
829
830 if (!m_backgroundBrush.Ok())
831 return;
832
833 if (m_canvas)
834 {
835 bool customColours = TRUE;
836 // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
837 // change background colours from the control-panel specified colours.
838 if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
839 customColours = FALSE;
840
841 if (customColours)
842 {
843 if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
844 {
845 m_canvas->SetTransparent(TRUE);
846 }
847 else
848 {
849 // New behaviour, 10/2/99: setting the background brush of a DC
850 // doesn't affect the window background colour. However,
851 // I'm leaving in the transparency setting because it's needed by
852 // various controls (e.g. wxStaticText) to determine whether to draw
853 // transparently or not. TODO: maybe this should be a new function
854 // wxWindow::SetTransparency(). Should that apply to the child itself, or the
855 // parent?
856 // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
857 m_canvas->SetTransparent(FALSE);
858 }
859 }
860 }
861 COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
862 {
863 (void)SetBkColor(GetHdc(), new_color);
864 }
865 }
866
867 void wxDC::SetBackgroundMode(int mode)
868 {
869 m_backgroundMode = mode;
870
871 if (m_backgroundMode == wxTRANSPARENT)
872 ::SetBkMode(GetHdc(), TRANSPARENT);
873 else
874 ::SetBkMode(GetHdc(), OPAQUE);
875 }
876
877 void wxDC::SetLogicalFunction(int function)
878 {
879 m_logicalFunction = function;
880
881 SetRop((WXHDC) m_hDC);
882 }
883
884 void wxDC::SetRop(WXHDC dc)
885 {
886 if (!dc || m_logicalFunction < 0)
887 return;
888
889 int c_rop;
890 // These may be wrong
891 switch (m_logicalFunction)
892 {
893 // case wxXOR: c_rop = R2_XORPEN; break;
894 case wxXOR: c_rop = R2_NOTXORPEN; break;
895 case wxINVERT: c_rop = R2_NOT; break;
896 case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
897 case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
898 case wxCLEAR: c_rop = R2_WHITE; break;
899 case wxSET: c_rop = R2_BLACK; break;
900 case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
901 case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
902 case wxAND: c_rop = R2_MASKPEN; break;
903 case wxOR: c_rop = R2_MERGEPEN; break;
904 case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
905 case wxEQUIV:
906 case wxNAND:
907 case wxCOPY:
908 default:
909 c_rop = R2_COPYPEN; break;
910 }
911 SetROP2((HDC) dc, c_rop);
912 }
913
914 bool wxDC::StartDoc(const wxString& message)
915 {
916 // We might be previewing, so return TRUE to let it continue.
917 return TRUE;
918 }
919
920 void wxDC::EndDoc()
921 {
922 }
923
924 void wxDC::StartPage()
925 {
926 }
927
928 void wxDC::EndPage()
929 {
930 }
931
932 // ---------------------------------------------------------------------------
933 // text metrics
934 // ---------------------------------------------------------------------------
935
936 long wxDC::GetCharHeight() const
937 {
938 TEXTMETRIC lpTextMetric;
939
940 GetTextMetrics(GetHdc(), &lpTextMetric);
941
942 return YDEV2LOGREL(lpTextMetric.tmHeight);
943 }
944
945 long wxDC::GetCharWidth() const
946 {
947 TEXTMETRIC lpTextMetric;
948
949 GetTextMetrics(GetHdc(), &lpTextMetric);
950
951 return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
952 }
953
954 void wxDC::GetTextExtent(const wxString& string, long *x, long *y,
955 long *descent, long *externalLeading,
956 wxFont *theFont) const
957 {
958 wxFont *fontToUse = (wxFont*) theFont;
959 if (!fontToUse)
960 fontToUse = (wxFont*) &m_font;
961
962 SIZE sizeRect;
963 TEXTMETRIC tm;
964
965 GetTextExtentPoint(GetHdc(), (char *)(const char *) string, strlen((char *)(const char *) string), &sizeRect);
966 GetTextMetrics(GetHdc(), &tm);
967
968 if (x) *x = XDEV2LOGREL(sizeRect.cx);
969 if (y) *y = YDEV2LOGREL(sizeRect.cy);
970 if (descent) *descent = tm.tmDescent;
971 if (externalLeading) *externalLeading = tm.tmExternalLeading;
972 }
973
974 void wxDC::SetMapMode(int mode)
975 {
976 m_mappingMode = mode;
977
978 int pixel_width = 0;
979 int pixel_height = 0;
980 int mm_width = 0;
981 int mm_height = 0;
982
983 pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
984 pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
985 mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
986 mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
987
988 if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
989 {
990 return;
991 }
992
993 double mm2pixelsX = pixel_width/mm_width;
994 double mm2pixelsY = pixel_height/mm_height;
995
996 switch (mode)
997 {
998 case wxMM_TWIPS:
999 {
1000 m_logicalScaleX = (twips2mm * mm2pixelsX);
1001 m_logicalScaleY = (twips2mm * mm2pixelsY);
1002 break;
1003 }
1004 case wxMM_POINTS:
1005 {
1006 m_logicalScaleX = (pt2mm * mm2pixelsX);
1007 m_logicalScaleY = (pt2mm * mm2pixelsY);
1008 break;
1009 }
1010 case wxMM_METRIC:
1011 {
1012 m_logicalScaleX = mm2pixelsX;
1013 m_logicalScaleY = mm2pixelsY;
1014 break;
1015 }
1016 case wxMM_LOMETRIC:
1017 {
1018 m_logicalScaleX = (mm2pixelsX/10.0);
1019 m_logicalScaleY = (mm2pixelsY/10.0);
1020 break;
1021 }
1022 default:
1023 case wxMM_TEXT:
1024 {
1025 m_logicalScaleX = 1.0;
1026 m_logicalScaleY = 1.0;
1027 break;
1028 }
1029 }
1030
1031 if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
1032 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1033
1034 SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1035 m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
1036 m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
1037 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
1038 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1039 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1040 }
1041
1042 void wxDC::SetUserScale(double x, double y)
1043 {
1044 m_userScaleX = x;
1045 m_userScaleY = y;
1046
1047 SetMapMode(m_mappingMode);
1048 }
1049
1050 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1051 {
1052 m_signX = xLeftRight ? 1 : -1;
1053 m_signY = yBottomUp ? -1 : 1;
1054
1055 SetMapMode(m_mappingMode);
1056 }
1057
1058 void wxDC::SetSystemScale(double x, double y)
1059 {
1060 m_scaleX = x;
1061 m_scaleY = y;
1062
1063 SetMapMode(m_mappingMode);
1064 }
1065
1066 void wxDC::SetLogicalOrigin(long x, long y)
1067 {
1068 m_logicalOriginX = x;
1069 m_logicalOriginY = y;
1070
1071 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1072 }
1073
1074 void wxDC::SetDeviceOrigin(long x, long y)
1075 {
1076 m_deviceOriginX = x;
1077 m_deviceOriginY = y;
1078
1079 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1080 }
1081
1082 // ---------------------------------------------------------------------------
1083 // coordinates transformations
1084 // ---------------------------------------------------------------------------
1085
1086 long wxDCBase::DeviceToLogicalX(long x) const
1087 {
1088 return (long) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1089 }
1090
1091 long wxDCBase::DeviceToLogicalXRel(long x) const
1092 {
1093 return (long) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1094 }
1095
1096 long wxDCBase::DeviceToLogicalY(long y) const
1097 {
1098 return (long) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1099 }
1100
1101 long wxDCBase::DeviceToLogicalYRel(long y) const
1102 {
1103 return (long) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1104 }
1105
1106 long wxDCBase::LogicalToDeviceX(long x) const
1107 {
1108 return (long) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1109 }
1110
1111 long wxDCBase::LogicalToDeviceXRel(long x) const
1112 {
1113 return (long) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1114 }
1115
1116 long wxDCBase::LogicalToDeviceY(long y) const
1117 {
1118 return (long) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1119 }
1120
1121 long wxDCBase::LogicalToDeviceYRel(long y) const
1122 {
1123 return (long) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1124 }
1125
1126 // ---------------------------------------------------------------------------
1127 // bit blit
1128 // ---------------------------------------------------------------------------
1129 bool wxDC::DoBlit(long xdest, long ydest, long width, long height,
1130 wxDC *source, long xsrc, long ysrc, int rop, bool useMask)
1131 {
1132 long xdest1 = xdest;
1133 long ydest1 = ydest;
1134 long xsrc1 = xsrc;
1135 long ysrc1 = ysrc;
1136
1137 // Chris Breeze 18/5/98: use text foreground/background colours
1138 // when blitting from 1-bit bitmaps
1139 COLORREF old_textground = ::GetTextColor(GetHdc());
1140 COLORREF old_background = ::GetBkColor(GetHdc());
1141 if (m_textForegroundColour.Ok())
1142 {
1143 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1144 }
1145 if (m_textBackgroundColour.Ok())
1146 {
1147 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1148 }
1149
1150 DWORD dwRop = rop == wxCOPY ? SRCCOPY :
1151 rop == wxCLEAR ? WHITENESS :
1152 rop == wxSET ? BLACKNESS :
1153 rop == wxINVERT ? DSTINVERT :
1154 rop == wxAND ? MERGECOPY :
1155 rop == wxOR ? MERGEPAINT :
1156 rop == wxSRC_INVERT ? NOTSRCCOPY :
1157 rop == wxXOR ? SRCINVERT :
1158 rop == wxOR_REVERSE ? MERGEPAINT :
1159 rop == wxAND_REVERSE ? SRCERASE :
1160 rop == wxSRC_OR ? SRCPAINT :
1161 rop == wxSRC_AND ? SRCAND :
1162 SRCCOPY;
1163
1164 bool success = TRUE;
1165 if (useMask && source->m_selectedBitmap.Ok() && source->m_selectedBitmap.GetMask())
1166 {
1167
1168 #if 0 // __WIN32__
1169 // Not implemented under Win95 (or maybe a specific device?)
1170 if (MaskBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1171 (HDC) source->m_hDC, xsrc1, ysrc1, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap(),
1172 0, 0, 0xAACC0020))
1173 {
1174 // Success
1175 }
1176 else
1177 #endif
1178 {
1179 // Old code
1180 #if 0
1181 HDC dc_mask = CreateCompatibleDC((HDC) source->m_hDC);
1182 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1183 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1184 dc_mask, xsrc1, ysrc1, 0x00220326 /* NOTSRCAND */) != 0);
1185 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1186 (HDC) source->m_hDC, xsrc1, ysrc1, SRCPAINT) != 0);
1187 ::SelectObject(dc_mask, 0);
1188 ::DeleteDC(dc_mask);
1189 #endif
1190 // New code from Chris Breeze, 15/7/98
1191 // Blit bitmap with mask
1192
1193 if (IsKindOf(CLASSINFO(wxPrinterDC)))
1194 {
1195 // If we are printing source colours are screen colours
1196 // not printer colours and so we need copy the bitmap
1197 // pixel by pixel.
1198 RECT rect;
1199 HDC dc_mask = ::CreateCompatibleDC((HDC) source->m_hDC);
1200 HDC dc_src = (HDC) source->m_hDC;
1201
1202 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1203 for (int x = 0; x < width; x++)
1204 {
1205 for (int y = 0; y < height; y++)
1206 {
1207 COLORREF cref = ::GetPixel(dc_mask, x, y);
1208 if (cref)
1209 {
1210 HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
1211 rect.left = xdest1 + x; rect.right = rect.left + 1;
1212 rect.top = ydest1 + y; rect.bottom = rect.top + 1;
1213 ::FillRect(GetHdc(), &rect, brush);
1214 ::DeleteObject(brush);
1215 }
1216 }
1217 }
1218 ::SelectObject(dc_mask, 0);
1219 ::DeleteDC(dc_mask);
1220 }
1221 else
1222 {
1223 // create a temp buffer bitmap and DCs to access it and the mask
1224 HDC dc_mask = ::CreateCompatibleDC((HDC) source->m_hDC);
1225 HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
1226 HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
1227 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1228 ::SelectObject(dc_buffer, buffer_bmap);
1229
1230 // copy dest to buffer
1231 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1232 GetHdc(), xdest1, ydest1, SRCCOPY);
1233
1234 // copy src to buffer using selected raster op
1235 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1236 (HDC) source->m_hDC, xsrc1, ysrc1, dwRop);
1237
1238 // set masked area in buffer to BLACK (pixel value 0)
1239 COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
1240 COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
1241 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1242 dc_mask, xsrc1, ysrc1, SRCAND);
1243
1244 // set unmasked area in dest to BLACK
1245 ::SetBkColor(GetHdc(), RGB(0, 0, 0));
1246 ::SetTextColor(GetHdc(), RGB(255, 255, 255));
1247 ::BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1248 dc_mask, xsrc1, ysrc1, SRCAND);
1249 ::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
1250 ::SetTextColor(GetHdc(), prevCol);
1251
1252 // OR buffer to dest
1253 success = (::BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1254 dc_buffer, 0, 0, SRCPAINT) != 0);
1255
1256 // tidy up temporary DCs and bitmap
1257 ::SelectObject(dc_mask, 0);
1258 ::DeleteDC(dc_mask);
1259 ::SelectObject(dc_buffer, 0);
1260 ::DeleteDC(dc_buffer);
1261 ::DeleteObject(buffer_bmap);
1262 }
1263 }
1264 }
1265 else
1266 {
1267 if (IsKindOf(CLASSINFO(wxPrinterDC)))
1268 {
1269 // If we are printing, source colours are screen colours
1270 // not printer colours and so we need copy the bitmap
1271 // pixel by pixel.
1272 HDC dc_src = (HDC) source->m_hDC;
1273 RECT rect;
1274 for (int x = 0; x < width; x++)
1275 {
1276 for (int y = 0; y < height; y++)
1277 {
1278 HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
1279 rect.left = xdest1 + x; rect.right = rect.left + 1;
1280 rect.top = ydest1 + y; rect.bottom = rect.top + 1;
1281 ::FillRect(GetHdc(), &rect, brush);
1282 ::DeleteObject(brush);
1283 }
1284 }
1285 }
1286 else
1287 {
1288 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height, (HDC) source->m_hDC,
1289 xsrc1, ysrc1, dwRop) != 0);
1290 }
1291 }
1292 ::SetTextColor(GetHdc(), old_textground);
1293 ::SetBkColor(GetHdc(), old_background);
1294
1295 return success;
1296 }
1297
1298 void wxDC::DoGetSize(int *w, int *h) const
1299 {
1300 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
1301 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
1302 }
1303
1304 void wxDC::DoGetSizeMM(int *w, int *h) const
1305 {
1306 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
1307 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1308 }
1309
1310 wxSize wxDC::GetPPI() const
1311 {
1312 int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
1313 int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
1314
1315 return wxSize(x, y);
1316 }
1317
1318 // For use by wxWindows only, unless custom units are required.
1319 void wxDC::SetLogicalScale(double x, double y)
1320 {
1321 m_logicalScaleX = x;
1322 m_logicalScaleY = y;
1323 }
1324
1325 #if WXWIN_COMPATIBILITY
1326 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1327 float *descent, float *externalLeading,
1328 wxFont *theFont, bool use16bit) const
1329 {
1330 long x1, y1, descent1, externalLeading1;
1331 GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1332 *x = x1; *y = y1;
1333 if (descent)
1334 *descent = descent1;
1335 if (externalLeading)
1336 *externalLeading = externalLeading1;
1337 }
1338 #endif
1339
1340 // ---------------------------------------------------------------------------
1341 // spline drawing code
1342 // ---------------------------------------------------------------------------
1343
1344 #if wxUSE_SPLINES
1345
1346 class wxSpline: public wxObject
1347 {
1348 public:
1349 int type;
1350 wxList *points;
1351
1352 wxSpline(wxList *list);
1353 void DeletePoints();
1354
1355 // Doesn't delete points
1356 ~wxSpline();
1357 };
1358
1359 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1360
1361 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1362 double a3, double b3, double a4, double b4);
1363 void wx_clear_stack();
1364 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1365 double *y3, double *x4, double *y4);
1366 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1367 double x4, double y4);
1368 static bool wx_spline_add_point(double x, double y);
1369 static void wx_spline_draw_point_array(wxDC *dc);
1370 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1371
1372 void wxDC::DoDrawSpline(wxList *list)
1373 {
1374 wxSpline spline(list);
1375
1376 wx_draw_open_spline(this, &spline);
1377 }
1378
1379 wxList wx_spline_point_list;
1380
1381 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1382 {
1383 wxPoint *p;
1384 double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1385 double x1, y1, x2, y2;
1386
1387 wxNode *node = spline->points->First();
1388 p = (wxPoint *)node->Data();
1389
1390 x1 = p->x;
1391 y1 = p->y;
1392
1393 node = node->Next();
1394 p = (wxPoint *)node->Data();
1395
1396 x2 = p->x;
1397 y2 = p->y;
1398 cx1 = (double)((x1 + x2) / 2);
1399 cy1 = (double)((y1 + y2) / 2);
1400 cx2 = (double)((cx1 + x2) / 2);
1401 cy2 = (double)((cy1 + y2) / 2);
1402
1403 wx_spline_add_point(x1, y1);
1404
1405 while ((node = node->Next()) != NULL)
1406 {
1407 p = (wxPoint *)node->Data();
1408 x1 = x2;
1409 y1 = y2;
1410 x2 = p->x;
1411 y2 = p->y;
1412 cx4 = (double)(x1 + x2) / 2;
1413 cy4 = (double)(y1 + y2) / 2;
1414 cx3 = (double)(x1 + cx4) / 2;
1415 cy3 = (double)(y1 + cy4) / 2;
1416
1417 wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1418
1419 cx1 = cx4;
1420 cy1 = cy4;
1421 cx2 = (double)(cx1 + x2) / 2;
1422 cy2 = (double)(cy1 + y2) / 2;
1423 }
1424
1425 wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1426 wx_spline_add_point(x2, y2);
1427
1428 wx_spline_draw_point_array(dc);
1429
1430 }
1431
1432 /********************* CURVES FOR SPLINES *****************************
1433
1434 The following spline drawing routine is from
1435
1436 "An Algorithm for High-Speed Curve Generation"
1437 by George Merrill Chaikin,
1438 Computer Graphics and Image Processing, 3, Academic Press,
1439 1974, 346-349.
1440
1441 and
1442
1443 "On Chaikin's Algorithm" by R. F. Riesenfeld,
1444 Computer Graphics and Image Processing, 4, Academic Press,
1445 1975, 304-310.
1446
1447 ***********************************************************************/
1448
1449 #define half(z1, z2) ((z1+z2)/2.0)
1450 #define THRESHOLD 5
1451
1452 /* iterative version */
1453
1454 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1455 double b4)
1456 {
1457 register double xmid, ymid;
1458 double x1, y1, x2, y2, x3, y3, x4, y4;
1459
1460 wx_clear_stack();
1461 wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1462
1463 while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1464 xmid = (double)half(x2, x3);
1465 ymid = (double)half(y2, y3);
1466 if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1467 fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1468 wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1469 wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1470 } else {
1471 wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1472 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1473 wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1474 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1475 }
1476 }
1477 }
1478
1479
1480 /* utilities used by spline drawing routines */
1481
1482
1483 typedef struct wx_spline_stack_struct {
1484 double x1, y1, x2, y2, x3, y3, x4, y4;
1485 }
1486 Stack;
1487
1488 #define SPLINE_STACK_DEPTH 20
1489 static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
1490 static Stack *wx_stack_top;
1491 static int wx_stack_count;
1492
1493 void wx_clear_stack()
1494 {
1495 wx_stack_top = wx_spline_stack;
1496 wx_stack_count = 0;
1497 }
1498
1499 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1500 {
1501 wx_stack_top->x1 = x1;
1502 wx_stack_top->y1 = y1;
1503 wx_stack_top->x2 = x2;
1504 wx_stack_top->y2 = y2;
1505 wx_stack_top->x3 = x3;
1506 wx_stack_top->y3 = y3;
1507 wx_stack_top->x4 = x4;
1508 wx_stack_top->y4 = y4;
1509 wx_stack_top++;
1510 wx_stack_count++;
1511 }
1512
1513 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1514 double *x3, double *y3, double *x4, double *y4)
1515 {
1516 if (wx_stack_count == 0)
1517 return (0);
1518 wx_stack_top--;
1519 wx_stack_count--;
1520 *x1 = wx_stack_top->x1;
1521 *y1 = wx_stack_top->y1;
1522 *x2 = wx_stack_top->x2;
1523 *y2 = wx_stack_top->y2;
1524 *x3 = wx_stack_top->x3;
1525 *y3 = wx_stack_top->y3;
1526 *x4 = wx_stack_top->x4;
1527 *y4 = wx_stack_top->y4;
1528 return (1);
1529 }
1530
1531 static bool wx_spline_add_point(double x, double y)
1532 {
1533 wxPoint *point = new wxPoint;
1534 point->x = (int) x;
1535 point->y = (int) y;
1536 wx_spline_point_list.Append((wxObject*)point);
1537 return TRUE;
1538 }
1539
1540 static void wx_spline_draw_point_array(wxDC *dc)
1541 {
1542 dc->DrawLines(&wx_spline_point_list, 0, 0);
1543 wxNode *node = wx_spline_point_list.First();
1544 while (node)
1545 {
1546 wxPoint *point = (wxPoint *)node->Data();
1547 delete point;
1548 delete node;
1549 node = wx_spline_point_list.First();
1550 }
1551 }
1552
1553 wxSpline::wxSpline(wxList *list)
1554 {
1555 points = list;
1556 }
1557
1558 wxSpline::~wxSpline()
1559 {
1560 }
1561
1562 void wxSpline::DeletePoints()
1563 {
1564 for(wxNode *node = points->First(); node; node = points->First())
1565 {
1566 wxPoint *point = (wxPoint *)node->Data();
1567 delete point;
1568 delete node;
1569 }
1570 delete points;
1571 }
1572
1573
1574 #endif // wxUSE_SPLINES
1575
wxWidgets (Impactor)