src/motif/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
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "dc.h"
  14 #endif
  15
  16 #include "wx/dc.h"
  17 #include "wx/dcmemory.h"
  18
  19 #if !USE_SHARED_LIBRARY
  20     IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  21 #endif
  22
  23 //-----------------------------------------------------------------------------
  24 // constants
  25 //-----------------------------------------------------------------------------
  26
  27 #define mm2inches        0.0393700787402
  28 #define inches2mm        25.4
  29 #define mm2twips         56.6929133859
  30 #define twips2mm         0.0176388888889
  31 #define mm2pt            2.83464566929
  32 #define pt2mm            0.352777777778
  33
  34 //-----------------------------------------------------------------------------
  35 // wxDC
  36 //-----------------------------------------------------------------------------
  37
  38 wxDC::wxDC()
  39 {
  40     m_ok = FALSE;
  41
  42     m_mm_to_pix_x = 1.0;
  43     m_mm_to_pix_y = 1.0;
  44
  45     m_backgroundMode = wxTRANSPARENT;
  46
  47     m_isInteractive = FALSE;
  48 }
  49
  50 void wxDC::DoDrawIcon( const wxIcon &icon, long x, long y)
  51 {
  52     wxCHECK_RET( Ok(), "invalid dc" );
  53     wxCHECK_RET( icon.Ok(), "invalid icon" );
  54
  55     DoDrawBitmap(icon, x, y, TRUE);
  56 }
  57
  58 void wxDC::DoDrawBitmap( const wxBitmap& bitmap, long x, long y, bool useMask )
  59 {
  60     wxCHECK_RET( bitmap.Ok(), "invalid bitmap" );
  61
  62     wxMemoryDC memDC;
  63     memDC.SelectObject(bitmap);
  64
  65 #if 0
  66     // Not sure if we need this. The mask should leave the masked areas as per
  67     // the original background of this DC.
  68     if (useMask)
  69     {
  70         // There might be transparent areas, so make these the same colour as this
  71         // DC
  72         memDC.SetBackground(* GetBackground());
  73         memDC.Clear();
  74     }
  75 #endif // 0
  76
  77     Blit(x, y, bitmap.GetWidth(), bitmap.GetHeight(), &memDC, 0, 0, wxCOPY, useMask);
  78
  79     memDC.SelectObject(wxNullBitmap);
  80 }
  81
  82 void wxDC::DoSetClippingRegion( long x, long y, long width, long height )
  83 {
  84     m_clipping = TRUE;
  85     m_clipX1 = x;
  86     m_clipY1 = y;
  87     m_clipX2 = x + width;
  88     m_clipY2 = y + height;
  89 }
  90
  91 void wxDC::DestroyClippingRegion()
  92 {
  93     m_clipping = FALSE;
  94 }
  95
  96 void wxDC::DoGetSize( int* width, int* height ) const
  97 {
  98     if ( width )
  99         *width = m_maxX - m_minX;
 100     if ( height )
 101         *height = m_maxY - m_minY;
 102 }
 103
 104 void wxDC::DoGetSizeMM( int* width, int* height ) const
 105 {
 106     int w, h;
 107     GetSize( &w, &h );
 108
 109     if ( width )
 110         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
 111     if ( height )
 112         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
 113 }
 114
 115 // Resolution in pixels per logical inch
 116 wxSize wxDC::GetPPI() const
 117 {
 118     // TODO (should probably be pure virtual)
 119     return wxSize(0, 0);
 120 }
 121
 122 void wxDC::SetMapMode( int mode )
 123 {
 124     switch (mode)
 125     {
 126     case wxMM_TWIPS:
 127         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 128         break;
 129     case wxMM_POINTS:
 130         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 131         break;
 132     case wxMM_METRIC:
 133         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 134         break;
 135     case wxMM_LOMETRIC:
 136         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 137         break;
 138     default:
 139     case wxMM_TEXT:
 140         SetLogicalScale( 1.0, 1.0 );
 141         break;
 142     }
 143     if (mode != wxMM_TEXT)
 144     {
 145         m_needComputeScaleX = TRUE;
 146         m_needComputeScaleY = TRUE;
 147     }
 148 }
 149
 150 void wxDC::SetUserScale( double x, double y )
 151 {
 152     // allow negative ? -> no
 153     m_userScaleX = x;
 154     m_userScaleY = y;
 155     ComputeScaleAndOrigin();
 156 }
 157
 158 void wxDC::SetLogicalScale( double x, double y )
 159 {
 160     // allow negative ?
 161     m_logicalScaleX = x;
 162     m_logicalScaleY = y;
 163     ComputeScaleAndOrigin();
 164 }
 165
 166 void wxDC::SetLogicalOrigin( long x, long y )
 167 {
 168     m_logicalOriginX = x * m_signX;   // is this still correct ?
 169     m_logicalOriginY = y * m_signY;
 170     ComputeScaleAndOrigin();
 171 }
 172
 173 void wxDC::SetDeviceOrigin( long x, long y )
 174 {
 175     m_externalDeviceOriginX = x;
 176     m_externalDeviceOriginY = y;
 177     ComputeScaleAndOrigin();
 178 }
 179
 180 void wxDC::SetInternalDeviceOrigin( long x, long y )
 181 {
 182     m_internalDeviceOriginX = x;
 183     m_internalDeviceOriginY = y;
 184     ComputeScaleAndOrigin();
 185 }
 186
 187 void wxDC::GetInternalDeviceOrigin( long *x, long *y )
 188 {
 189     if (x) *x = m_internalDeviceOriginX;
 190     if (y) *y = m_internalDeviceOriginY;
 191 }
 192
 193 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 194 {
 195     m_signX = xLeftRight ?  1 : -1;
 196     m_signY = yBottomUp  ? -1 :  1;
 197     ComputeScaleAndOrigin();
 198 }
 199
 200 long wxDCBase::DeviceToLogicalX(long x) const
 201 {
 202   return ((wxDC *)this)->XDEV2LOG(x);
 203 }
 204
 205 long wxDCBase::DeviceToLogicalY(long y) const
 206 {
 207   return ((wxDC *)this)->YDEV2LOG(y);
 208 }
 209
 210 long wxDCBase::DeviceToLogicalXRel(long x) const
 211 {
 212   return ((wxDC *)this)->XDEV2LOGREL(x);
 213 }
 214
 215 long wxDCBase::DeviceToLogicalYRel(long y) const
 216 {
 217   return ((wxDC *)this)->YDEV2LOGREL(y);
 218 }
 219
 220 long wxDCBase::LogicalToDeviceX(long x) const
 221 {
 222   return ((wxDC *)this)->XLOG2DEV(x);
 223 }
 224
 225 long wxDCBase::LogicalToDeviceY(long y) const
 226 {
 227   return ((wxDC *)this)->YLOG2DEV(y);
 228 }
 229
 230 long wxDCBase::LogicalToDeviceXRel(long x) const
 231 {
 232   return ((wxDC *)this)->XLOG2DEVREL(x);
 233 }
 234
 235 long wxDCBase::LogicalToDeviceYRel(long y) const
 236 {
 237   return ((wxDC *)this)->YLOG2DEVREL(y);
 238 }
 239
 240 void wxDC::ComputeScaleAndOrigin()
 241 {
 242     // CMB: copy scale to see if it changes
 243     double origScaleX = m_scaleX;
 244     double origScaleY = m_scaleY;
 245
 246     m_scaleX = m_logicalScaleX * m_userScaleX;
 247     m_scaleY = m_logicalScaleY * m_userScaleY;
 248
 249     m_deviceOriginX = m_internalDeviceOriginX + m_externalDeviceOriginX;
 250     m_deviceOriginY = m_internalDeviceOriginY + m_externalDeviceOriginY;
 251
 252     // CMB: if scale has changed call SetPen to recalulate the line width
 253     if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 254     {
 255         // this is a bit artificial, but we need to force wxDC to think
 256         // the pen has changed
 257         wxPen* pen = & GetPen();
 258         wxPen tempPen;
 259         m_pen = tempPen;
 260         SetPen(* pen);
 261     }
 262 }
 263