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 #include "wx/defs.h"
  19
  20 #if !USE_SHARED_LIBRARY
  21     IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  22 #endif
  23
  24 //-----------------------------------------------------------------------------
  25 // constants
  26 //-----------------------------------------------------------------------------
  27
  28 #define mm2inches        0.0393700787402
  29 #define inches2mm        25.4
  30 #define mm2twips         56.6929133859
  31 #define twips2mm         0.0176388888889
  32 #define mm2pt            2.83464566929
  33 #define pt2mm            0.352777777778
  34
  35 //-----------------------------------------------------------------------------
  36 // wxDC
  37 //-----------------------------------------------------------------------------
  38
  39 wxDC::wxDC()
  40 {
  41     m_ok = FALSE;
  42
  43     m_mm_to_pix_x = 1.0;
  44     m_mm_to_pix_y = 1.0;
  45
  46     m_backgroundMode = wxTRANSPARENT;
  47
  48     m_isInteractive = FALSE;
  49 }
  50
  51 void wxDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y)
  52 {
  53     wxCHECK_RET( Ok(), "invalid dc" );
  54     wxCHECK_RET( icon.Ok(), "invalid icon" );
  55
  56     DoDrawBitmap(icon, x, y, TRUE);
  57 }
  58
  59 void wxDC::DoDrawBitmap( const wxBitmap& bitmap, wxCoord x, wxCoord y, bool useMask )
  60 {
  61     wxCHECK_RET( bitmap.Ok(), "invalid bitmap" );
  62
  63     wxMemoryDC memDC;
  64     memDC.SelectObject(bitmap);
  65
  66 #if 0
  67     // Not sure if we need this. The mask should leave the masked areas as per
  68     // the original background of this DC.
  69     if (useMask)
  70     {
  71         // There might be transparent areas, so make these the same colour as this
  72         // DC
  73         memDC.SetBackground(* GetBackground());
  74         memDC.Clear();
  75     }
  76 #endif // 0
  77
  78     Blit(x, y, bitmap.GetWidth(), bitmap.GetHeight(), &memDC, 0, 0, wxCOPY, useMask);
  79
  80     memDC.SelectObject(wxNullBitmap);
  81 }
  82
  83 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  84 {
  85     m_clipping = TRUE;
  86     m_clipX1 = x;
  87     m_clipY1 = y;
  88     m_clipX2 = x + width;
  89     m_clipY2 = y + height;
  90 }
  91
  92 void wxDC::DestroyClippingRegion()
  93 {
  94     m_clipping = FALSE;
  95 }
  96
  97 void wxDC::DoGetSize( int* width, int* height ) const
  98 {
  99     if ( width )
 100         *width = m_maxX - m_minX;
 101     if ( height )
 102         *height = m_maxY - m_minY;
 103 }
 104
 105 void wxDC::DoGetSizeMM( int* width, int* height ) const
 106 {
 107     int w, h;
 108     GetSize( &w, &h );
 109
 110     if ( width )
 111         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
 112     if ( height )
 113         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
 114 }
 115
 116 // Resolution in pixels per logical inch
 117 wxSize wxDC::GetPPI() const
 118 {
 119     // TODO (should probably be pure virtual)
 120     return wxSize(0, 0);
 121 }
 122
 123 void wxDC::SetMapMode( int mode )
 124 {
 125     switch (mode)
 126     {
 127     case wxMM_TWIPS:
 128         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 129         break;
 130     case wxMM_POINTS:
 131         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 132         break;
 133     case wxMM_METRIC:
 134         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 135         break;
 136     case wxMM_LOMETRIC:
 137         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 138         break;
 139     default:
 140     case wxMM_TEXT:
 141         SetLogicalScale( 1.0, 1.0 );
 142         break;
 143     }
 144     if (mode != wxMM_TEXT)
 145     {
 146         m_needComputeScaleX = TRUE;
 147         m_needComputeScaleY = TRUE;
 148     }
 149 }
 150
 151 void wxDC::SetUserScale( double x, double y )
 152 {
 153     // allow negative ? -> no
 154     m_userScaleX = x;
 155     m_userScaleY = y;
 156     ComputeScaleAndOrigin();
 157 }
 158
 159 void wxDC::SetLogicalScale( double x, double y )
 160 {
 161     // allow negative ?
 162     m_logicalScaleX = x;
 163     m_logicalScaleY = y;
 164     ComputeScaleAndOrigin();
 165 }
 166
 167 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 168 {
 169     m_logicalOriginX = x * m_signX;   // is this still correct ?
 170     m_logicalOriginY = y * m_signY;
 171     ComputeScaleAndOrigin();
 172 }
 173
 174 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 175 {
 176     m_externalDeviceOriginX = x;
 177     m_externalDeviceOriginY = y;
 178     ComputeScaleAndOrigin();
 179 }
 180
 181 void wxDC::SetInternalDeviceOrigin( wxCoord x, wxCoord y )
 182 {
 183     m_internalDeviceOriginX = x;
 184     m_internalDeviceOriginY = y;
 185     ComputeScaleAndOrigin();
 186 }
 187
 188 void wxDC::GetInternalDeviceOrigin( wxCoord *x, wxCoord *y )
 189 {
 190     if (x) *x = m_internalDeviceOriginX;
 191     if (y) *y = m_internalDeviceOriginY;
 192 }
 193
 194 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 195 {
 196     m_signX = xLeftRight ?  1 : -1;
 197     m_signY = yBottomUp  ? -1 :  1;
 198     ComputeScaleAndOrigin();
 199 }
 200
 201 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 202 {
 203   return ((wxDC *)this)->XDEV2LOG(x);
 204 }
 205
 206 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 207 {
 208   return ((wxDC *)this)->YDEV2LOG(y);
 209 }
 210
 211 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 212 {
 213   return ((wxDC *)this)->XDEV2LOGREL(x);
 214 }
 215
 216 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 217 {
 218   return ((wxDC *)this)->YDEV2LOGREL(y);
 219 }
 220
 221 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 222 {
 223   return ((wxDC *)this)->XLOG2DEV(x);
 224 }
 225
 226 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 227 {
 228   return ((wxDC *)this)->YLOG2DEV(y);
 229 }
 230
 231 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 232 {
 233   return ((wxDC *)this)->XLOG2DEVREL(x);
 234 }
 235
 236 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 237 {
 238   return ((wxDC *)this)->YLOG2DEVREL(y);
 239 }
 240
 241 void wxDC::ComputeScaleAndOrigin()
 242 {
 243     // CMB: copy scale to see if it changes
 244     double origScaleX = m_scaleX;
 245     double origScaleY = m_scaleY;
 246
 247     m_scaleX = m_logicalScaleX * m_userScaleX;
 248     m_scaleY = m_logicalScaleY * m_userScaleY;
 249
 250     m_deviceOriginX = m_internalDeviceOriginX + m_externalDeviceOriginX;
 251     m_deviceOriginY = m_internalDeviceOriginY + m_externalDeviceOriginY;
 252
 253     // CMB: if scale has changed call SetPen to recalulate the line width
 254     if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 255     {
 256         // this is a bit artificial, but we need to force wxDC to think
 257         // the pen has changed
 258         wxPen* pen = & GetPen();
 259         wxPen tempPen;
 260         m_pen = tempPen;
 261         SetPen(* pen);
 262     }
 263 }
 264