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     m_internalDeviceOriginX = 0;
  51     m_internalDeviceOriginY = 0;
  52     m_externalDeviceOriginX = 0;
  53     m_externalDeviceOriginY = 0;
  54 }
  55
  56 void wxDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y)
  57 {
  58     wxCHECK_RET( Ok(), "invalid dc" );
  59     wxCHECK_RET( icon.Ok(), "invalid icon" );
  60
  61     DoDrawBitmap(icon, x, y, TRUE);
  62 }
  63
  64 void wxDC::DoDrawBitmap( const wxBitmap& bitmap, wxCoord x, wxCoord y, bool useMask )
  65 {
  66     wxCHECK_RET( bitmap.Ok(), "invalid bitmap" );
  67
  68     wxMemoryDC memDC;
  69     memDC.SelectObject(bitmap);
  70
  71 #if 0
  72     // Not sure if we need this. The mask should leave the masked areas as per
  73     // the original background of this DC.
  74     if (useMask)
  75     {
  76         // There might be transparent areas, so make these the same colour as this
  77         // DC
  78         memDC.SetBackground(* GetBackground());
  79         memDC.Clear();
  80     }
  81 #endif // 0
  82
  83     Blit(x, y, bitmap.GetWidth(), bitmap.GetHeight(), &memDC, 0, 0, wxCOPY, useMask);
  84
  85     memDC.SelectObject(wxNullBitmap);
  86 }
  87
  88 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  89 {
  90     m_clipping = TRUE;
  91     m_clipX1 = x;
  92     m_clipY1 = y;
  93     m_clipX2 = x + width;
  94     m_clipY2 = y + height;
  95 }
  96
  97 void wxDC::DestroyClippingRegion()
  98 {
  99     m_clipping = FALSE;
 100 }
 101
 102 void wxDC::DoGetSize( int* width, int* height ) const
 103 {
 104     if ( width )
 105         *width = m_maxX - m_minX;
 106     if ( height )
 107         *height = m_maxY - m_minY;
 108 }
 109
 110 void wxDC::DoGetSizeMM( int* width, int* height ) const
 111 {
 112     int w, h;
 113     GetSize( &w, &h );
 114
 115     if ( width )
 116         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
 117     if ( height )
 118         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
 119 }
 120
 121 // Resolution in pixels per logical inch
 122 wxSize wxDC::GetPPI() const
 123 {
 124     // TODO (should probably be pure virtual)
 125     return wxSize(0, 0);
 126 }
 127
 128 void wxDC::SetMapMode( int mode )
 129 {
 130     switch (mode)
 131     {
 132     case wxMM_TWIPS:
 133         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 134         break;
 135     case wxMM_POINTS:
 136         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 137         break;
 138     case wxMM_METRIC:
 139         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 140         break;
 141     case wxMM_LOMETRIC:
 142         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 143         break;
 144     default:
 145     case wxMM_TEXT:
 146         SetLogicalScale( 1.0, 1.0 );
 147         break;
 148     }
 149     if (mode != wxMM_TEXT)
 150     {
 151         m_needComputeScaleX = TRUE;
 152         m_needComputeScaleY = TRUE;
 153     }
 154 }
 155
 156 void wxDC::SetUserScale( double x, double y )
 157 {
 158     // allow negative ? -> no
 159     m_userScaleX = x;
 160     m_userScaleY = y;
 161     ComputeScaleAndOrigin();
 162 }
 163
 164 void wxDC::SetLogicalScale( double x, double y )
 165 {
 166     // allow negative ?
 167     m_logicalScaleX = x;
 168     m_logicalScaleY = y;
 169     ComputeScaleAndOrigin();
 170 }
 171
 172 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 173 {
 174     m_logicalOriginX = x * m_signX;   // is this still correct ?
 175     m_logicalOriginY = y * m_signY;
 176     ComputeScaleAndOrigin();
 177 }
 178
 179 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 180 {
 181     m_externalDeviceOriginX = x;
 182     m_externalDeviceOriginY = y;
 183     ComputeScaleAndOrigin();
 184 }
 185
 186 void wxDC::SetInternalDeviceOrigin( wxCoord x, wxCoord y )
 187 {
 188     m_internalDeviceOriginX = x;
 189     m_internalDeviceOriginY = y;
 190     ComputeScaleAndOrigin();
 191 }
 192
 193 void wxDC::GetInternalDeviceOrigin( wxCoord *x, wxCoord *y )
 194 {
 195     if (x) *x = m_internalDeviceOriginX;
 196     if (y) *y = m_internalDeviceOriginY;
 197 }
 198
 199 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 200 {
 201     m_signX = xLeftRight ?  1 : -1;
 202     m_signY = yBottomUp  ? -1 :  1;
 203     ComputeScaleAndOrigin();
 204 }
 205
 206 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 207 {
 208   return ((wxDC *)this)->XDEV2LOG(x);
 209 }
 210
 211 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 212 {
 213   return ((wxDC *)this)->YDEV2LOG(y);
 214 }
 215
 216 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 217 {
 218   return ((wxDC *)this)->XDEV2LOGREL(x);
 219 }
 220
 221 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 222 {
 223   return ((wxDC *)this)->YDEV2LOGREL(y);
 224 }
 225
 226 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 227 {
 228   return ((wxDC *)this)->XLOG2DEV(x);
 229 }
 230
 231 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 232 {
 233   return ((wxDC *)this)->YLOG2DEV(y);
 234 }
 235
 236 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 237 {
 238   return ((wxDC *)this)->XLOG2DEVREL(x);
 239 }
 240
 241 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 242 {
 243   return ((wxDC *)this)->YLOG2DEVREL(y);
 244 }
 245
 246 void wxDC::ComputeScaleAndOrigin()
 247 {
 248     // CMB: copy scale to see if it changes
 249     double origScaleX = m_scaleX;
 250     double origScaleY = m_scaleY;
 251
 252     m_scaleX = m_logicalScaleX * m_userScaleX;
 253     m_scaleY = m_logicalScaleY * m_userScaleY;
 254
 255     m_deviceOriginX = m_internalDeviceOriginX + m_externalDeviceOriginX;
 256     m_deviceOriginY = m_internalDeviceOriginY + m_externalDeviceOriginY;
 257
 258     // CMB: if scale has changed call SetPen to recalulate the line width
 259     if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 260     {
 261         // this is a bit artificial, but we need to force wxDC to think
 262         // the pen has changed
 263         wxPen* pen = & GetPen();
 264         wxPen tempPen;
 265         m_pen = tempPen;
 266         SetPen(* pen);
 267     }
 268 }
 269