src/cocoa/dc.mm

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/cocoa/dc.mm
   3 // Purpose:     wxDC
   4 // Author:      David Elliott
   5 // Modified by:
   6 // Created:     2003/04/01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 David Elliott
   9 // Licence:     wxWidgets licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13 #ifndef WX_PRECOMP
  14     #include "wx/log.h"
  15     #include "wx/dc.h"
  16 #endif //WX_PRECOMP
  17
  18 #include "wx/cocoa/autorelease.h"
  19 #include "wx/cocoa/string.h"
  20
  21 #import <AppKit/NSBezierPath.h>
  22 #import <AppKit/NSTextStorage.h>
  23 #import <AppKit/NSLayoutManager.h>
  24 #import <AppKit/NSTextContainer.h>
  25 #import <AppKit/NSGraphicsContext.h>
  26 #import <AppKit/NSAffineTransform.h>
  27 #import <AppKit/NSColor.h>
  28 #import <AppKit/NSTypesetter.h>
  29 #import <AppKit/NSImage.h>
  30
  31 #include "wx/listimpl.cpp"
  32 WX_DEFINE_LIST(wxCocoaDCStack);
  33
  34 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  35 WX_NSTextStorage wxDC::sm_cocoaNSTextStorage = nil;
  36 WX_NSLayoutManager wxDC::sm_cocoaNSLayoutManager = nil;
  37 WX_NSTextContainer wxDC::sm_cocoaNSTextContainer = nil;
  38 wxCocoaDCStack wxDC::sm_cocoaDCStack;
  39
  40 inline void CocoaSetPenForNSBezierPath(wxPen &pen, NSBezierPath *bezpath)
  41 {
  42     [pen.GetNSColor() set];
  43     const float *pattern;
  44     [bezpath setLineDash:pattern count:pen.GetCocoaLineDash(&pattern) phase:0.0];
  45     [bezpath setLineWidth:pen.GetWidth()];
  46     switch(pen.GetJoin())
  47     {
  48     case wxJOIN_BEVEL:
  49         [bezpath setLineJoinStyle:NSBevelLineJoinStyle];
  50         break;
  51     case wxJOIN_ROUND:
  52         [bezpath setLineJoinStyle:NSRoundLineJoinStyle];
  53         break;
  54     case wxJOIN_MITER:
  55         [bezpath setLineJoinStyle:NSMiterLineJoinStyle];
  56         break;
  57     }
  58     switch(pen.GetCap())
  59     {
  60     case wxCAP_ROUND:
  61         [bezpath setLineCapStyle:NSRoundLineCapStyle];
  62         break;
  63     case wxCAP_PROJECTING:
  64         [bezpath setLineCapStyle:NSSquareLineCapStyle];
  65         break;
  66     case wxCAP_BUTT:
  67         [bezpath setLineCapStyle:NSButtLineCapStyle];
  68         break;
  69     }
  70 }
  71
  72 void wxDC::CocoaInitializeTextSystem()
  73 {
  74     wxASSERT_MSG(!sm_cocoaNSTextStorage && !sm_cocoaNSLayoutManager && !sm_cocoaNSTextContainer,wxT("Text system already initalized!  BAD PROGRAMMER!"));
  75
  76     sm_cocoaNSTextStorage = [[NSTextStorage alloc] init];
  77
  78     sm_cocoaNSLayoutManager = [[NSLayoutManager alloc] init];
  79     [sm_cocoaNSTextStorage addLayoutManager:sm_cocoaNSLayoutManager];
  80     // NSTextStorage retains NSLayoutManager, but so do we
  81     // [sm_cocoaNSLayoutManager release]; [sm_cocoaNSLayoutManager retain];
  82
  83     // NOTE:  initWithContainerSize is the designated initializer, but the
  84     // Apple CircleView sample gets away with just calling init, which
  85     // is all we really need for our purposes.
  86     sm_cocoaNSTextContainer = [[NSTextContainer alloc] init];
  87     [sm_cocoaNSLayoutManager addTextContainer:sm_cocoaNSTextContainer];
  88     // NSLayoutManager retains NSTextContainer, but so do we
  89     // [sm_cocoaNSTextContainer release]; [sm_cocoaNSTextContainer retain];
  90 }
  91
  92 void wxDC::CocoaShutdownTextSystem()
  93 {
  94     [sm_cocoaNSTextContainer release]; sm_cocoaNSTextContainer = nil;
  95     [sm_cocoaNSLayoutManager release]; sm_cocoaNSLayoutManager = nil;
  96     [sm_cocoaNSTextStorage release]; sm_cocoaNSTextStorage = nil;
  97 }
  98
  99 void wxDC::CocoaUnwindStackAndLoseFocus()
 100 {
 101     wxCocoaDCStack::compatibility_iterator ourNode=sm_cocoaDCStack.Find(this);
 102     if(ourNode)
 103     {
 104         wxCocoaDCStack::compatibility_iterator node=sm_cocoaDCStack.GetFirst();
 105         for(;node!=ourNode; node=sm_cocoaDCStack.GetFirst())
 106         {
 107             wxDC *dc = node->GetData();
 108             wxASSERT(dc);
 109             wxASSERT(dc!=this);
 110             if(!dc->CocoaUnlockFocus())
 111             {
 112                 wxFAIL_MSG(wxT("Unable to unlock focus on higher-level DC!"));
 113             }
 114             sm_cocoaDCStack.Erase(node);
 115         }
 116         wxASSERT(node==ourNode);
 117         wxASSERT(ourNode->GetData() == this);
 118         ourNode->GetData()->CocoaUnlockFocus();
 119         sm_cocoaDCStack.Erase(ourNode);
 120     }
 121 }
 122
 123 bool wxDC::CocoaUnwindStackAndTakeFocus()
 124 {
 125     wxCocoaDCStack::compatibility_iterator node=sm_cocoaDCStack.GetFirst();
 126     for(;node;node = sm_cocoaDCStack.GetFirst())
 127     {
 128         wxDC *dc = node->GetData();
 129         wxASSERT(dc);
 130         // If we're on the stack, then it's unwound enough and we have focus
 131         if(dc==this)
 132             return true;
 133         // If unable to unlockFocus (e.g. wxPaintDC) stop here
 134         if(!dc->CocoaUnlockFocus())
 135             break;
 136         sm_cocoaDCStack.Erase(node);
 137     }
 138     return CocoaLockFocus();
 139 }
 140
 141 wxDC::wxDC(void)
 142 {
 143     m_cocoaWxToBoundsTransform = nil;
 144     m_pen = *wxBLACK_PEN;
 145 }
 146
 147 wxDC::~wxDC(void)
 148 {
 149 }
 150
 151 bool wxDC::CocoaLockFocus()
 152 {
 153     return false;
 154 }
 155
 156 bool wxDC::CocoaUnlockFocus()
 157 {
 158     return false;
 159 }
 160
 161 /*static*/ WX_NSAffineTransform wxDC::CocoaGetWxToBoundsTransform(bool isFlipped, float height)
 162 {
 163     NSAffineTransform *transform = nil;
 164     // This transform flips the graphics since wxDC uses top-left origin
 165     if(!isFlipped)
 166     {
 167         // The transform is auto released
 168         transform = [NSAffineTransform transform];
 169         /*  x' = 1x + 0y + 0
 170             y' = 0x + -1y + window's height
 171         */
 172         NSAffineTransformStruct matrix = {
 173             1,  0
 174         ,   0, -1
 175         ,   0, height
 176         };
 177         [transform setTransformStruct: matrix];
 178     }
 179     return transform;
 180 }
 181
 182 void wxDC::CocoaApplyTransformations()
 183 {
 184     [m_cocoaWxToBoundsTransform concat];
 185     // TODO: Apply device/logical/user position/scaling transformations
 186 }
 187
 188 void wxDC::CocoaUnapplyTransformations()
 189 {
 190     // NOTE: You *must* call this with focus held.
 191     // Undo all transforms so we're back in true Cocoa coords with
 192     // no scaling or flipping.
 193     NSAffineTransform *invertTransform;
 194     invertTransform = [m_cocoaWxToBoundsTransform copy];
 195     [invertTransform invert];
 196     [invertTransform concat];
 197     [invertTransform release];
 198 }
 199
 200 bool wxDC::CocoaGetBounds(void *rectData)
 201 {
 202     // We don't know what we are so we can't return anything.
 203     return false;
 204 }
 205
 206 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 207 {
 208     wxAutoNSAutoreleasePool pool;
 209     if(!CocoaTakeFocus()) return;
 210     NSBezierPath *bezpath = [NSBezierPath bezierPathWithRect:NSMakeRect(x,y,width,height)];
 211     CocoaSetPenForNSBezierPath(m_pen,bezpath);
 212     [bezpath stroke];
 213     [m_brush.GetNSColor() set];
 214     [bezpath fill];
 215 }
 216
 217 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 218 {
 219     wxAutoNSAutoreleasePool pool;
 220     if(!CocoaTakeFocus()) return;
 221     NSBezierPath *bezpath = [NSBezierPath bezierPath];
 222     [bezpath moveToPoint:NSMakePoint(x1,y1)];
 223     [bezpath lineToPoint:NSMakePoint(x2,y2)];
 224
 225     CocoaSetPenForNSBezierPath(m_pen,bezpath);
 226     [bezpath stroke];
 227 }
 228
 229 void wxDC::DoGetTextExtent(const wxString& text, wxCoord *x, wxCoord *y, wxCoord *descent, wxCoord *externalLeading, wxFont *theFont) const
 230 {
 231     wxAutoNSAutoreleasePool pool;
 232 // FIXME: Cache this so it can be used for DoDrawText
 233     wxASSERT_MSG(sm_cocoaNSTextStorage && sm_cocoaNSLayoutManager && sm_cocoaNSTextContainer, wxT("Text system has not been initialized.  BAD PROGRAMMER!"));
 234     NSAttributedString *attributedString = [[NSAttributedString alloc]
 235             initWithString:wxNSStringWithWxString(text.c_str())];
 236     [sm_cocoaNSTextStorage setAttributedString:attributedString];
 237     [attributedString release];
 238
 239     NSRange glyphRange = [sm_cocoaNSLayoutManager glyphRangeForTextContainer:sm_cocoaNSTextContainer];
 240     NSRect usedRect = [sm_cocoaNSLayoutManager usedRectForTextContainer:sm_cocoaNSTextContainer];
 241     if(x)
 242         *x=(int)usedRect.size.width;
 243     if(y)
 244         *y=(int)usedRect.size.height;
 245     if(descent)
 246         *descent=0;
 247     if(externalLeading)
 248         *externalLeading=0;
 249 }
 250
 251 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 252 {
 253     wxAutoNSAutoreleasePool pool;
 254     if(!CocoaTakeFocus()) return;
 255     wxASSERT_MSG(sm_cocoaNSTextStorage && sm_cocoaNSLayoutManager && sm_cocoaNSTextContainer, wxT("Text system has not been initialized.  BAD PROGRAMMER!"));
 256     NSAttributedString *attributedString = [[NSAttributedString alloc]
 257             initWithString:wxNSStringWithWxString(text.c_str())];
 258     [sm_cocoaNSTextStorage setAttributedString:attributedString];
 259     [attributedString release];
 260
 261     // Set the color (and later font) attributes
 262     NSColor *fgColor = m_textForegroundColour.GetNSColor();
 263     NSColor *bgColor = m_textBackgroundColour.GetNSColor();
 264     if(!fgColor)
 265         fgColor = [NSColor clearColor];
 266     if(!bgColor)
 267         bgColor = [NSColor clearColor];
 268     NSDictionary *attrDict = [[NSDictionary alloc] initWithObjectsAndKeys:
 269             fgColor, NSForegroundColorAttributeName,
 270             bgColor, NSBackgroundColorAttributeName,
 271             nil];
 272     [sm_cocoaNSTextStorage addAttributes: attrDict range:NSMakeRange(0,[sm_cocoaNSTextStorage length])];
 273     [attrDict release];
 274
 275     NSRange glyphRange = [sm_cocoaNSLayoutManager glyphRangeForTextContainer:sm_cocoaNSTextContainer];
 276     NSRect usedRect = [sm_cocoaNSLayoutManager usedRectForTextContainer:sm_cocoaNSTextContainer];
 277     // NOTE: We'll crash trying to get the location of glyphAtIndex:0 if
 278     // there is no length or we don't start at zero
 279     if(!glyphRange.length)
 280         return;
 281     wxASSERT_MSG(glyphRange.location==0,wxT("glyphRange must begin at zero"));
 282
 283     NSAffineTransform *transform = [NSAffineTransform transform];
 284     [transform translateXBy:x yBy:y];
 285
 286     NSAffineTransform *flipTransform = [NSAffineTransform transform];
 287     /*  x' = 1x + 0y + 0
 288         y' = 0x + -1y + window's height
 289     */
 290     NSAffineTransformStruct matrix = {
 291         1,  0
 292     ,   0, -1
 293     ,   0, usedRect.size.height
 294     };
 295     [flipTransform setTransformStruct: matrix];
 296
 297     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 298     [context saveGraphicsState];
 299     [transform concat];
 300     [flipTransform concat];
 301     #if 0
 302     // Draw+fill a rectangle so we can see where the shit is supposed to be.
 303     wxLogTrace(wxTRACE_COCOA,wxT("(%f,%f) (%fx%f)"),usedRect.origin.x,usedRect.origin.y,usedRect.size.width,usedRect.size.height);
 304     NSBezierPath *bezpath = [NSBezierPath bezierPathWithRect:NSMakeRect(0,0,usedRect.size.width,usedRect.size.height)];
 305     [[NSColor blackColor] set];
 306     [bezpath stroke];
 307     [[NSColor blueColor] set];
 308     [bezpath fill];
 309     #endif
 310
 311     NSPoint layoutLocation = [sm_cocoaNSLayoutManager locationForGlyphAtIndex:0];
 312     layoutLocation.x = 0.0;
 313     layoutLocation.y *= -1.0;
 314     layoutLocation.y += [[sm_cocoaNSLayoutManager typesetter] baselineOffsetInLayoutManager:sm_cocoaNSLayoutManager glyphIndex:0];
 315     if(m_backgroundMode==wxSOLID)
 316         [sm_cocoaNSLayoutManager drawBackgroundForGlyphRange:glyphRange  atPoint:NSZeroPoint];
 317     [sm_cocoaNSLayoutManager drawGlyphsForGlyphRange:glyphRange  atPoint:layoutLocation];
 318
 319     [context restoreGraphicsState];
 320 }
 321
 322 // wxDCBase functions
 323 int wxDCBase::DeviceToLogicalX(int x) const
 324 {
 325     return x;
 326 }
 327
 328 int wxDCBase::DeviceToLogicalY(int y) const
 329 {
 330     return y;
 331 }
 332
 333 int wxDCBase::DeviceToLogicalXRel(int x) const
 334 {
 335     return x;
 336 }
 337
 338 int wxDCBase::DeviceToLogicalYRel(int y) const
 339 {
 340     return y;
 341 }
 342
 343 int wxDCBase::LogicalToDeviceX(int x) const
 344 {
 345     return x;
 346 }
 347
 348 int wxDCBase::LogicalToDeviceY(int y) const
 349 {
 350     return y;
 351 }
 352
 353 int wxDCBase::LogicalToDeviceXRel(int x) const
 354 {
 355     return x;
 356 }
 357
 358 int wxDCBase::LogicalToDeviceYRel(int y) const
 359 {
 360     return y;
 361 }
 362
 363 ///////////////////////////////////////////////////////////////////////////
 364 // cut here, the rest is stubs
 365 ///////////////////////////////////////////////////////////////////////////
 366
 367 //-----------------------------------------------------------------------------
 368 // constants
 369 //-----------------------------------------------------------------------------
 370
 371 #define mm2inches               0.0393700787402
 372 #define inches2mm               25.4
 373 #define mm2twips                56.6929133859
 374 #define twips2mm                0.0176388888889
 375 #define mm2pt                   2.83464566929
 376 #define pt2mm                   0.352777777778
 377
 378 //-----------------------------------------------------------------------------
 379 // wxDC
 380 //-----------------------------------------------------------------------------
 381
 382 void wxDC::DoDrawIcon( const wxIcon &WXUNUSED(icon), int WXUNUSED(x), int WXUNUSED(y) )
 383 {
 384 };
 385
 386 void wxDC::DoDrawPoint( int x, int y )
 387 {
 388 };
 389
 390 void wxDC::DoDrawPolygon( int, wxPoint *, int, int, int)
 391 {
 392 };
 393
 394 void wxDC::DoDrawLines( int, wxPoint *, int, int )
 395 {
 396 }
 397
 398 int wxDC::GetDepth() const
 399 {
 400     return 0;
 401 }
 402
 403 wxSize wxDC::GetPPI() const
 404 {
 405     return wxSize(0,0);
 406 }
 407
 408 bool wxDC::CanGetTextExtent() const
 409 {
 410     return false;
 411 }
 412
 413 wxCoord wxDC::GetCharHeight() const
 414 {
 415     return 0;
 416 }
 417
 418 wxCoord wxDC::GetCharWidth() const
 419 {
 420     return 0;
 421 }
 422
 423 bool wxDC::CanDrawBitmap() const
 424 {
 425     return true;
 426 }
 427
 428 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 429 {
 430     return false;
 431 }
 432
 433 void wxDC::DoDrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoord xc, wxCoord yc)
 434 {
 435 }
 436
 437 void wxDC::SetPen(const wxPen& pen)
 438 {
 439     m_pen = pen;
 440 }
 441
 442 void wxDC::SetBrush(const wxBrush& brush)
 443 {
 444     m_brush = brush;
 445 }
 446
 447 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 448 {
 449 }
 450
 451 void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 452 {
 453 }
 454
 455 void wxDC::DestroyClippingRegion()
 456 {
 457 }
 458
 459 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
 460 {
 461 }
 462
 463 void wxDC::DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 464 {
 465 }
 466
 467 void wxDC::DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h, double sa, double ea)
 468 {
 469 }
 470
 471 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 472 {
 473 }
 474
 475 void wxDC::DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask)
 476 {
 477     wxAutoNSAutoreleasePool pool;
 478     if(!CocoaTakeFocus()) return;
 479     if(!bmp.Ok())
 480         return;
 481
 482 #if 0
 483     // Draw a rect so we can see where it's supposed to be
 484     wxLogTrace(wxTRACE_COCOA,wxT("image at (%d,%d) size %dx%d"),x,y,bmp.GetWidth(),bmp.GetHeight());
 485     NSBezierPath *bezpath = [NSBezierPath bezierPathWithRect:NSMakeRect(x,y,bmp.GetWidth(),bmp.GetHeight())];
 486     [[NSColor blackColor] set];
 487     [bezpath stroke];
 488     [[NSColor blueColor] set];
 489     [bezpath fill];
 490 #endif // 0
 491
 492     NSAffineTransform *transform = [NSAffineTransform transform];
 493     [transform translateXBy:x yBy:y];
 494
 495     NSAffineTransform *flipTransform = [NSAffineTransform transform];
 496     /*  x' = 1x + 0y + 0
 497         y' = 0x + -1y + window's height
 498     */
 499     NSAffineTransformStruct matrix = {
 500         1,  0
 501     ,   0, -1
 502     ,   0, bmp.GetHeight()
 503     };
 504     [flipTransform setTransformStruct: matrix];
 505
 506     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 507     [context saveGraphicsState];
 508     [transform concat];
 509     [flipTransform concat];
 510
 511     NSImage *nsimage = [bmp.GetNSImage(useMask) retain];
 512
 513     [nsimage drawAtPoint: NSMakePoint(0,0)
 514         fromRect: NSMakeRect(0.0,0.0,bmp.GetWidth(),bmp.GetHeight())
 515         operation: NSCompositeSourceOver
 516         fraction: 1.0];
 517
 518     [nsimage release];
 519     [context restoreGraphicsState];
 520 }
 521
 522 bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
 523 {
 524     return false;
 525 }
 526
 527 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 528 {
 529 }
 530
 531
 532 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height, wxDC *source, wxCoord xsrc, wxCoord ysrc, int rop, bool useMask , wxCoord xsrcMask, wxCoord ysrcMask)
 533 {
 534     if(!CocoaTakeFocus()) return false;
 535     if(!source) return false;
 536     return source->CocoaDoBlitOnFocusedDC(xdest,ydest,width,height,
 537         xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
 538 }
 539
 540 bool wxDC::CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
 541     wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
 542     int logicalFunc, bool useMask, wxCoord xsrcMask, wxCoord ysrcMask)
 543 {
 544     return false;
 545 }
 546
 547 void wxDC::DoGetSize( int* width, int* height ) const
 548 {
 549   *width = m_maxX-m_minX;
 550   *height = m_maxY-m_minY;
 551 };
 552
 553 void wxDC::DoGetSizeMM( int* width, int* height ) const
 554 {
 555   int w = 0;
 556   int h = 0;
 557   GetSize( &w, &h );
 558 };
 559
 560 void wxDC::SetTextForeground( const wxColour &col )
 561 {
 562   if (!Ok()) return;
 563   m_textForegroundColour = col;
 564 };
 565
 566 void wxDC::SetTextBackground( const wxColour &col )
 567 {
 568   if (!Ok()) return;
 569   m_textBackgroundColour = col;
 570 };
 571
 572 void wxDC::Clear()
 573 {
 574     if(!CocoaTakeFocus()) return;
 575
 576     NSRect boundsRect;
 577     if(!CocoaGetBounds(&boundsRect)) return;
 578
 579     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 580     [context saveGraphicsState];
 581
 582     // Undo all transforms so when we draw our bounds rect we
 583     // really overwrite our bounds rect.
 584     CocoaUnapplyTransformations();
 585
 586     [m_backgroundBrush.GetNSColor() set];
 587     [NSBezierPath fillRect:boundsRect];
 588
 589     [context restoreGraphicsState];
 590 }
 591
 592 void wxDC::SetBackground(const wxBrush& brush)
 593 {
 594     m_backgroundBrush = brush;
 595 }
 596
 597 void wxDC::SetPalette(const wxPalette&)
 598 {
 599 }
 600
 601 void wxDC::SetLogicalFunction(int)
 602 {
 603 }
 604
 605
 606 void wxDC::SetMapMode( int mode )
 607 {
 608   switch (mode)
 609   {
 610     case wxMM_TWIPS:
 611       break;
 612     case wxMM_POINTS:
 613       break;
 614     case wxMM_METRIC:
 615       break;
 616     case wxMM_LOMETRIC:
 617       break;
 618     default:
 619     case wxMM_TEXT:
 620       SetLogicalScale( 1.0, 1.0 );
 621       break;
 622   };
 623   if (mode != wxMM_TEXT)
 624   {
 625   };
 626 };
 627
 628 void wxDC::SetUserScale( double x, double y )
 629 {
 630   // allow negative ? -> no
 631   m_userScaleX = x;
 632   m_userScaleY = y;
 633   ComputeScaleAndOrigin();
 634 };
 635
 636 void wxDC::SetLogicalScale( double x, double y )
 637 {
 638   // allow negative ?
 639   m_logicalScaleX = x;
 640   m_logicalScaleY = y;
 641   ComputeScaleAndOrigin();
 642 };
 643
 644 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 645 {
 646   m_logicalOriginX = x * m_signX;   // is this still correct ?
 647   m_logicalOriginY = y * m_signY;
 648   ComputeScaleAndOrigin();
 649 };
 650
 651 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 652 {
 653   ComputeScaleAndOrigin();
 654 };
 655
 656 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 657 {
 658   m_signX = (xLeftRight ?  1 : -1);
 659   m_signY = (yBottomUp  ? -1 :  1);
 660   ComputeScaleAndOrigin();
 661 };
 662
 663 void wxDC::ComputeScaleAndOrigin(void)
 664 {
 665   // CMB: copy scale to see if it changes
 666   double origScaleX = m_scaleX;
 667   double origScaleY = m_scaleY;
 668
 669   m_scaleX = m_logicalScaleX * m_userScaleX;
 670   m_scaleY = m_logicalScaleY * m_userScaleY;
 671
 672   // CMB: if scale has changed call SetPen to recalulate the line width
 673   if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 674   {
 675     // this is a bit artificial, but we need to force wxDC to think
 676     // the pen has changed
 677     const wxPen* pen = & GetPen();
 678     wxPen tempPen;
 679     m_pen = tempPen;
 680     SetPen(* pen);
 681   }
 682 };
 683