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 //-----------------------------------------------------------------------------
  18 // constants
  19 //-----------------------------------------------------------------------------
  20
  21 #define mm2inches               0.0393700787402
  22 #define inches2mm               25.4
  23 #define mm2twips                56.6929133859
  24 #define twips2mm                0.0176388888889
  25 #define mm2pt                   2.83464566929
  26 #define pt2mm                   0.352777777778
  27
  28 //-----------------------------------------------------------------------------
  29 // wxDC
  30 //-----------------------------------------------------------------------------
  31
  32 IMPLEMENT_ABSTRACT_CLASS(wxDC,wxObject)
  33
  34 wxDC::wxDC(void)
  35 {
  36   m_ok = FALSE;
  37   m_optimize = FALSE;
  38   m_autoSetting = FALSE;
  39   m_colour = TRUE;
  40   m_clipping = FALSE;
  41
  42   m_mm_to_pix_x = 1.0;
  43   m_mm_to_pix_y = 1.0;
  44
  45   m_logicalOriginX = 0;
  46   m_logicalOriginY = 0;
  47   m_deviceOriginX = 0;
  48   m_deviceOriginY = 0;
  49
  50   m_logicalScaleX = 1.0;
  51   m_logicalScaleY = 1.0;
  52   m_userScaleX = 1.0;
  53   m_userScaleY = 1.0;
  54   m_scaleX = 1.0;
  55   m_scaleY = 1.0;
  56
  57   m_mappingMode = MM_TEXT;
  58   m_needComputeScaleX = FALSE;
  59   m_needComputeScaleY = FALSE;
  60
  61   m_signX = 1;  // default x-axis left to right
  62   m_signY = 1;  // default y-axis top down
  63
  64   m_maxX = m_maxY = -100000;
  65   m_minY = m_minY =  100000;
  66
  67   m_logicalFunction = wxCOPY;
  68 //  m_textAlignment = wxALIGN_TOP_LEFT;
  69   m_backgroundMode = wxTRANSPARENT;
  70
  71   m_textForegroundColour = *wxBLACK;
  72   m_textBackgroundColour = *wxWHITE;
  73   m_pen = *wxBLACK_PEN;
  74   m_font = *wxNORMAL_FONT;
  75   m_brush = *wxTRANSPARENT_BRUSH;
  76   m_backgroundBrush = *wxWHITE_BRUSH;
  77
  78 //  m_palette = wxAPP_COLOURMAP;
  79 }
  80
  81 wxDC::~wxDC(void)
  82 {
  83 }
  84
  85 bool wxDC::Ok(void) const
  86 {
  87   wxASSERT_MSG( m_ok, "invalid display context" );
  88   return m_ok;
  89 }
  90
  91 void wxDC::DrawArc( long WXUNUSED(x1), long WXUNUSED(y1), long WXUNUSED(x2), long WXUNUSED(y2),
  92   double WXUNUSED(xc), double WXUNUSED(yc) )
  93 {
  94 }
  95
  96 void wxDC::DrawPoint( wxPoint& point )
  97 {
  98   DrawPoint( point.x, point.y );
  99 }
 100
 101 void wxDC::DrawPolygon( wxList *list, long xoffset, long yoffset, int fillStyle )
 102 {
 103   int n = list->Number();
 104   wxPoint *points = new wxPoint[n];
 105
 106   int i = 0;
 107   for( wxNode *node = list->First(); node; node = node->Next() )
 108   {
 109     wxPoint *point = (wxPoint *)node->Data();
 110     points[i].x = point->x;
 111     points[i++].y = point->y;
 112   }
 113   DrawPolygon( n, points, xoffset, yoffset, fillStyle );
 114   delete[] points;
 115 }
 116
 117 void wxDC::DrawLines( wxList *list, long xoffset, long yoffset )
 118 {
 119   int n = list->Number();
 120   wxPoint *points = new wxPoint[n];
 121
 122   int i = 0;
 123   for( wxNode *node = list->First(); node; node = node->Next() )
 124   {
 125     wxPoint *point = (wxPoint *)node->Data();
 126     points[i].x = point->x;
 127     points[i++].y = point->y;
 128   }
 129   DrawLines( n, points, xoffset, yoffset );
 130   delete []points;
 131 }
 132
 133 void wxDC::DrawSpline( long x1, long y1, long x2, long y2, long x3, long y3 )
 134 {
 135   wxList list;
 136   list.Append( (wxObject*)new wxPoint(x1, y1) );
 137   list.Append( (wxObject*)new wxPoint(x2, y2) );
 138   list.Append( (wxObject*)new wxPoint(x3, y3) );
 139   DrawSpline(&list);
 140   wxNode *node = list.First();
 141   while (node)
 142   {
 143     wxPoint *p = (wxPoint*)node->Data();
 144     delete p;
 145     node = node->Next();
 146   }
 147 }
 148
 149 void wxDC::DrawSpline( int n, wxPoint points[] )
 150 {
 151   wxList list;
 152   for (int i = 0; i < n; i++) list.Append( (wxObject*)&points[i] );
 153   DrawSpline( &list );
 154 }
 155
 156 void wxDC::SetClippingRegion( long x, long y, long width, long height )
 157 {
 158   m_clipping = TRUE;
 159   m_clipX1 = x;
 160   m_clipY1 = y;
 161   m_clipX2 = x + width;
 162   m_clipY2 = y + height;
 163 }
 164
 165 void wxDC::DestroyClippingRegion(void)
 166 {
 167   m_clipping = FALSE;
 168 }
 169
 170 void wxDC::GetClippingBox( long *x, long *y, long *width, long *height ) const
 171 {
 172   if (m_clipping)
 173   {
 174     if (x) *x = m_clipX1;
 175     if (y) *y = m_clipY1;
 176     if (width) *width = (m_clipX2 - m_clipX1);
 177     if (height) *height = (m_clipY2 - m_clipY1);
 178   }
 179   else
 180    *x = *y = *width = *height = 0;
 181 }
 182
 183 void wxDC::GetSize( int* width, int* height ) const
 184 {
 185   *width = m_maxX-m_minX;
 186   *height = m_maxY-m_minY;
 187 }
 188
 189 void wxDC::GetSizeMM( long* width, long* height ) const
 190 {
 191   int w = 0;
 192   int h = 0;
 193   GetSize( &w, &h );
 194   *width = long( double(w) / (m_scaleX*m_mm_to_pix_x) );
 195   *height = long( double(h) / (m_scaleY*m_mm_to_pix_y) );
 196 }
 197
 198 void wxDC::SetTextForeground( const wxColour &col )
 199 {
 200   if (!Ok()) return;
 201   m_textForegroundColour = col;
 202 }
 203
 204 void wxDC::SetTextBackground( const wxColour &col )
 205 {
 206   if (!Ok()) return;
 207   m_textBackgroundColour = col;
 208 }
 209
 210 void wxDC::SetMapMode( int mode )
 211 {
 212   switch (mode)
 213   {
 214     case MM_TWIPS:
 215       SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 216       break;
 217     case MM_POINTS:
 218       SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 219       break;
 220     case MM_METRIC:
 221       SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 222       break;
 223     case MM_LOMETRIC:
 224       SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 225       break;
 226     default:
 227     case MM_TEXT:
 228       SetLogicalScale( 1.0, 1.0 );
 229       break;
 230   }
 231   if (mode != MM_TEXT)
 232   {
 233     m_needComputeScaleX = TRUE;
 234     m_needComputeScaleY = TRUE;
 235   }
 236 }
 237
 238 void wxDC::SetUserScale( double x, double y )
 239 {
 240   // allow negative ? -> no
 241   m_userScaleX = x;
 242   m_userScaleY = y;
 243   ComputeScaleAndOrigin();
 244 }
 245
 246 void wxDC::GetUserScale( double *x, double *y )
 247 {
 248   if (x) *x = m_userScaleX;
 249   if (y) *y = m_userScaleY;
 250 }
 251
 252 void wxDC::SetLogicalScale( double x, double y )
 253 {
 254   // allow negative ?
 255   m_logicalScaleX = x;
 256   m_logicalScaleY = y;
 257   ComputeScaleAndOrigin();
 258 }
 259
 260 void wxDC::GetLogicalScale( double *x, double *y )
 261 {
 262   if (x) *x = m_logicalScaleX;
 263   if (y) *y = m_logicalScaleY;
 264 }
 265
 266 void wxDC::SetLogicalOrigin( long x, long y )
 267 {
 268   m_logicalOriginX = x * m_signX;   // is this still correct ?
 269   m_logicalOriginY = y * m_signY;
 270   ComputeScaleAndOrigin();
 271 }
 272
 273 void wxDC::GetLogicalOrigin( long *x, long *y )
 274 {
 275   if (x) *x = m_logicalOriginX;
 276   if (y) *y = m_logicalOriginY;
 277 }
 278
 279 void wxDC::SetDeviceOrigin( long x, long y )
 280 {
 281   m_deviceOriginX = x;
 282   m_deviceOriginY = y;
 283   ComputeScaleAndOrigin();
 284 }
 285
 286 void wxDC::GetDeviceOrigin( long *x, long *y )
 287 {
 288   if (x) *x = m_deviceOriginX;
 289   if (y) *y = m_deviceOriginY;
 290 }
 291
 292 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 293 {
 294   m_signX = (xLeftRight ?  1 : -1);
 295   m_signY = (yBottomUp  ? -1 :  1);
 296   ComputeScaleAndOrigin();
 297 }
 298
 299 long wxDC::DeviceToLogicalX(long x) const
 300 {
 301   return XDEV2LOG(x);
 302 }
 303
 304 long wxDC::DeviceToLogicalY(long y) const
 305 {
 306   return YDEV2LOG(y);
 307 }
 308
 309 long wxDC::DeviceToLogicalXRel(long x) const
 310 {
 311   return XDEV2LOGREL(x);
 312 }
 313
 314 long wxDC::DeviceToLogicalYRel(long y) const
 315 {
 316   return YDEV2LOGREL(y);
 317 }
 318
 319 long wxDC::LogicalToDeviceX(long x) const
 320 {
 321   return XLOG2DEV(x);
 322 }
 323
 324 long wxDC::LogicalToDeviceY(long y) const
 325 {
 326   return YLOG2DEV(y);
 327 }
 328
 329 long wxDC::LogicalToDeviceXRel(long x) const
 330 {
 331   return XLOG2DEVREL(x);
 332 }
 333
 334 long wxDC::LogicalToDeviceYRel(long y) const
 335 {
 336   return YLOG2DEVREL(y);
 337 }
 338
 339 void wxDC::CalcBoundingBox( long x, long y )
 340 {
 341   if (x < m_minX) m_minX = x;
 342   if (y < m_minY) m_minY = y;
 343   if (x > m_maxX) m_maxX = x;
 344   if (y > m_maxY) m_maxY = y;
 345 }
 346
 347 void wxDC::ComputeScaleAndOrigin(void)
 348 {
 349   // CMB: copy scale to see if it changes
 350   double origScaleX = m_scaleX;
 351   double origScaleY = m_scaleY;
 352
 353   m_scaleX = m_logicalScaleX * m_userScaleX;
 354   m_scaleY = m_logicalScaleY * m_userScaleY;
 355
 356   // CMB: if scale has changed call SetPen to recalulate the line width
 357   if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 358   {
 359     // this is a bit artificial, but we need to force wxDC to think
 360     // the pen has changed
 361       // Using this code, wxDC will ignore the new settings
 362       // so it's complete non-sense, Robert Roebling TODO!!
 363         // It even gives an Assert, Robert Roebling
 364 /*
 365     wxPen* pen = GetPen();
 366     wxPen tempPen;
 367     m_pen = tempPen;
 368     SetPen(pen);
 369 */
 370   }
 371 }
 372