src/gtk/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1998 Robert Roebling, Markus Holzem
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "dc.h"
  13 #endif
  14
  15 #include "wx/dc.h"
  16
  17 #include "gdk/gdk.h"
  18 #include "gtk/gtk.h"
  19
  20 //-----------------------------------------------------------------------------
  21 // constants
  22 //-----------------------------------------------------------------------------
  23
  24 #define mm2inches               0.0393700787402
  25 #define inches2mm               25.4
  26 #define mm2twips                56.6929133859
  27 #define twips2mm                0.0176388888889
  28 #define mm2pt                   2.83464566929
  29 #define pt2mm                   0.352777777778
  30
  31 //-----------------------------------------------------------------------------
  32 // wxDC
  33 //-----------------------------------------------------------------------------
  34
  35 IMPLEMENT_ABSTRACT_CLASS(wxDC,wxObject)
  36
  37 wxDC::wxDC()
  38 {
  39     m_ok = FALSE;
  40     m_optimize = FALSE;
  41     m_autoSetting = FALSE;
  42     m_colour = TRUE;
  43     m_clipping = FALSE;
  44
  45     m_mm_to_pix_x = 1.0;
  46     m_mm_to_pix_y = 1.0;
  47
  48     m_logicalOriginX = 0;
  49     m_logicalOriginY = 0;
  50     m_deviceOriginX = 0;
  51     m_deviceOriginY = 0;
  52
  53     m_logicalScaleX = 1.0;
  54     m_logicalScaleY = 1.0;
  55     m_userScaleX = 1.0;
  56     m_userScaleY = 1.0;
  57     m_scaleX = 1.0;
  58     m_scaleY = 1.0;
  59
  60     m_mappingMode = MM_TEXT;
  61     m_needComputeScaleX = FALSE;
  62     m_needComputeScaleY = FALSE;
  63
  64     m_signX = 1;  // default x-axis left to right
  65     m_signY = 1;  // default y-axis top down
  66
  67     m_maxX = m_maxY = -100000;
  68     m_minY = m_minY =  100000;
  69
  70     m_logicalFunction = wxCOPY;
  71 //  m_textAlignment = wxALIGN_TOP_LEFT;
  72     m_backgroundMode = wxTRANSPARENT;
  73
  74     m_textForegroundColour = *wxBLACK;
  75     m_textBackgroundColour = *wxWHITE;
  76     m_pen = *wxBLACK_PEN;
  77     m_font = *wxNORMAL_FONT;
  78     m_brush = *wxTRANSPARENT_BRUSH;
  79     m_backgroundBrush = *wxWHITE_BRUSH;
  80
  81 //  m_palette = wxAPP_COLOURMAP;
  82 }
  83
  84 wxDC::~wxDC()
  85 {
  86 }
  87
  88 bool wxDC::Ok() const
  89 {
  90     return m_ok;
  91 }
  92
  93 void wxDC::DrawArc( long WXUNUSED(x1), long WXUNUSED(y1), long WXUNUSED(x2), long WXUNUSED(y2),
  94   double WXUNUSED(xc), double WXUNUSED(yc) )
  95 {
  96 }
  97
  98 void wxDC::DrawPoint( wxPoint& point )
  99 {
 100     DrawPoint( point.x, point.y );
 101 }
 102
 103 void wxDC::DrawPolygon( wxList *list, long xoffset, long yoffset, int fillStyle )
 104 {
 105     int n = list->Number();
 106     wxPoint *points = new wxPoint[n];
 107
 108     int i = 0;
 109     for( wxNode *node = list->First(); node; node = node->Next() )
 110     {
 111         wxPoint *point = (wxPoint *)node->Data();
 112         points[i].x = point->x;
 113         points[i++].y = point->y;
 114     }
 115
 116     DrawPolygon( n, points, xoffset, yoffset, fillStyle );
 117     delete[] points;
 118 }
 119
 120 void wxDC::DrawLines( wxList *list, long xoffset, long yoffset )
 121 {
 122     int n = list->Number();
 123     wxPoint *points = new wxPoint[n];
 124
 125     int i = 0;
 126     for( wxNode *node = list->First(); node; node = node->Next() )
 127     {
 128         wxPoint *point = (wxPoint *)node->Data();
 129         points[i].x = point->x;
 130         points[i++].y = point->y;
 131     }
 132
 133     DrawLines( n, points, xoffset, yoffset );
 134     delete []points;
 135 }
 136
 137 void wxDC::DrawSpline( long x1, long y1, long x2, long y2, long x3, long y3 )
 138 {
 139     wxList list;
 140     list.Append( (wxObject*)new wxPoint(x1, y1) );
 141     list.Append( (wxObject*)new wxPoint(x2, y2) );
 142     list.Append( (wxObject*)new wxPoint(x3, y3) );
 143     DrawSpline(&list);
 144     wxNode *node = list.First();
 145     while (node)
 146     {
 147         wxPoint *p = (wxPoint*)node->Data();
 148         delete p;
 149         node = node->Next();
 150     }
 151 }
 152
 153 void wxDC::DrawSpline( int n, wxPoint points[] )
 154 {
 155     wxList list;
 156     for (int i = 0; i < n; i++) list.Append( (wxObject*)&points[i] );
 157     DrawSpline( &list );
 158 }
 159
 160 void wxDC::SetClippingRegion( long x, long y, long width, long height )
 161 {
 162     m_clipping = TRUE;
 163     m_clipX1 = x;
 164     m_clipY1 = y;
 165     m_clipX2 = x + width;
 166     m_clipY2 = y + height;
 167 }
 168
 169 void wxDC::DestroyClippingRegion()
 170 {
 171     m_clipping = FALSE;
 172 }
 173
 174 void wxDC::GetClippingBox( long *x, long *y, long *width, long *height ) const
 175 {
 176     if (m_clipping)
 177     {
 178         if (x) *x = m_clipX1;
 179         if (y) *y = m_clipY1;
 180         if (width) *width = (m_clipX2 - m_clipX1);
 181         if (height) *height = (m_clipY2 - m_clipY1);
 182     }
 183     else
 184     {
 185         *x = *y = *width = *height = 0;
 186     }
 187 }
 188
 189 void wxDC::GetSize( int* width, int* height ) const
 190 {
 191     if (width) *width = m_maxX-m_minX;
 192     if (height) *height = m_maxY-m_minY;
 193 }
 194
 195 void wxDC::GetSizeMM( long* width, long* height ) const
 196 {
 197     int w = 0;
 198     int h = 0;
 199     GetSize( &w, &h );
 200     if (width) *width = long( double(w) / (m_scaleX*m_mm_to_pix_x) );
 201     if (height) *height = long( double(h) / (m_scaleY*m_mm_to_pix_y) );
 202 }
 203
 204 void wxDC::SetTextForeground( const wxColour &col )
 205 {
 206     m_textForegroundColour = col;
 207 }
 208
 209 void wxDC::SetTextBackground( const wxColour &col )
 210 {
 211     m_textBackgroundColour = col;
 212 }
 213
 214 void wxDC::SetMapMode( int mode )
 215 {
 216     switch (mode)
 217     {
 218         case MM_TWIPS:
 219           SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 220           break;
 221         case MM_POINTS:
 222           SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 223           break;
 224         case MM_METRIC:
 225           SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 226           break;
 227         case MM_LOMETRIC:
 228           SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 229           break;
 230         default:
 231         case MM_TEXT:
 232           SetLogicalScale( 1.0, 1.0 );
 233           break;
 234     }
 235 /*  we don't do this mega optimisation
 236     if (mode != MM_TEXT)
 237     {
 238         m_needComputeScaleX = TRUE;
 239         m_needComputeScaleY = TRUE;
 240     }
 241 */
 242 }
 243
 244 void wxDC::SetUserScale( double x, double y )
 245 {
 246     // allow negative ? -> no
 247     m_userScaleX = x;
 248     m_userScaleY = y;
 249     ComputeScaleAndOrigin();
 250 }
 251
 252 void wxDC::GetUserScale( double *x, double *y )
 253 {
 254     if (x) *x = m_userScaleX;
 255     if (y) *y = m_userScaleY;
 256 }
 257
 258 void wxDC::SetLogicalScale( double x, double y )
 259 {
 260     // allow negative ?
 261     m_logicalScaleX = x;
 262     m_logicalScaleY = y;
 263     ComputeScaleAndOrigin();
 264 }
 265
 266 void wxDC::GetLogicalScale( double *x, double *y )
 267 {
 268     if (x) *x = m_logicalScaleX;
 269     if (y) *y = m_logicalScaleY;
 270 }
 271
 272 void wxDC::SetLogicalOrigin( long x, long y )
 273 {
 274     m_logicalOriginX = x * m_signX;   // is this still correct ?
 275     m_logicalOriginY = y * m_signY;
 276     ComputeScaleAndOrigin();
 277 }
 278
 279 void wxDC::GetLogicalOrigin( long *x, long *y )
 280 {
 281     if (x) *x = m_logicalOriginX;
 282     if (y) *y = m_logicalOriginY;
 283 }
 284
 285 void wxDC::SetDeviceOrigin( long x, long y )
 286 {
 287     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 288     m_deviceOriginX = x;
 289     m_deviceOriginY = y;
 290     ComputeScaleAndOrigin();
 291 }
 292
 293 void wxDC::GetDeviceOrigin( long *x, long *y )
 294 {
 295     if (x) *x = m_deviceOriginX;
 296     if (y) *y = m_deviceOriginY;
 297 }
 298
 299 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 300 {
 301     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 302     m_signX = (xLeftRight ?  1 : -1);
 303     m_signY = (yBottomUp  ? -1 :  1);
 304     ComputeScaleAndOrigin();
 305 }
 306
 307 long wxDC::DeviceToLogicalX(long x) const
 308 {
 309     return XDEV2LOG(x);
 310 }
 311
 312 long wxDC::DeviceToLogicalY(long y) const
 313 {
 314     return YDEV2LOG(y);
 315 }
 316
 317 long wxDC::DeviceToLogicalXRel(long x) const
 318 {
 319     return XDEV2LOGREL(x);
 320 }
 321
 322 long wxDC::DeviceToLogicalYRel(long y) const
 323 {
 324     return YDEV2LOGREL(y);
 325 }
 326
 327 long wxDC::LogicalToDeviceX(long x) const
 328 {
 329     return XLOG2DEV(x);
 330 }
 331
 332 long wxDC::LogicalToDeviceY(long y) const
 333 {
 334     return YLOG2DEV(y);
 335 }
 336
 337 long wxDC::LogicalToDeviceXRel(long x) const
 338 {
 339     return XLOG2DEVREL(x);
 340 }
 341
 342 long wxDC::LogicalToDeviceYRel(long y) const
 343 {
 344     return YLOG2DEVREL(y);
 345 }
 346
 347 void wxDC::CalcBoundingBox( long x, long y )
 348 {
 349     if (x < m_minX) m_minX = x;
 350     if (y < m_minY) m_minY = y;
 351     if (x > m_maxX) m_maxX = x;
 352     if (y > m_maxY) m_maxY = y;
 353 }
 354
 355 void wxDC::ComputeScaleAndOrigin()
 356 {
 357     // CMB: copy scale to see if it changes
 358     double origScaleX = m_scaleX;
 359     double origScaleY = m_scaleY;
 360
 361     m_scaleX = m_logicalScaleX * m_userScaleX;
 362     m_scaleY = m_logicalScaleY * m_userScaleY;
 363
 364     // CMB: if scale has changed call SetPen to recalulate the line width
 365     if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 366     {
 367       // this is a bit artificial, but we need to force wxDC to think
 368       // the pen has changed
 369         // It gives an Assert, Robert Roebling
 370 /*
 371       wxPen pen = m_pen;
 372       m_pen = wxNullPen;
 373       SetPen( pen );
 374 */
 375   }
 376 }
 377