src/x11/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 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  21
  22 //-----------------------------------------------------------------------------
  23 // constants
  24 //-----------------------------------------------------------------------------
  25
  26 #define mm2inches        0.0393700787402
  27 #define inches2mm        25.4
  28 #define mm2twips         56.6929133859
  29 #define twips2mm         0.0176388888889
  30 #define mm2pt            2.83464566929
  31 #define pt2mm            0.352777777778
  32
  33 //-----------------------------------------------------------------------------
  34 // wxDC
  35 //-----------------------------------------------------------------------------
  36
  37 wxDC::wxDC()
  38 {
  39     m_ok = FALSE;
  40
  41     m_mm_to_pix_x = 1.0;
  42     m_mm_to_pix_y = 1.0;
  43
  44     m_backgroundMode = wxTRANSPARENT;
  45
  46     m_isInteractive = FALSE;
  47 }
  48
  49 void wxDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y)
  50 {
  51     wxCHECK_RET( Ok(), "invalid dc" );
  52     wxCHECK_RET( icon.Ok(), "invalid icon" );
  53
  54     DoDrawBitmap(icon, x, y, TRUE);
  55 }
  56
  57 void wxDC::DoDrawBitmap( const wxBitmap& bitmap, wxCoord x, wxCoord y, bool useMask )
  58 {
  59     wxCHECK_RET( bitmap.Ok(), "invalid bitmap" );
  60
  61     wxMemoryDC memDC;
  62     memDC.SelectObject(bitmap);
  63
  64 #if 0
  65     // Not sure if we need this. The mask should leave the masked areas as per
  66     // the original background of this DC.
  67     if (useMask)
  68     {
  69         // There might be transparent areas, so make these the same colour as this
  70         // DC
  71         memDC.SetBackground(* GetBackground());
  72         memDC.Clear();
  73     }
  74 #endif // 0
  75
  76     Blit(x, y, bitmap.GetWidth(), bitmap.GetHeight(), &memDC, 0, 0, wxCOPY, useMask);
  77
  78     memDC.SelectObject(wxNullBitmap);
  79 }
  80
  81 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  82 {
  83     m_clipping = TRUE;
  84     m_clipX1 = x;
  85     m_clipY1 = y;
  86     m_clipX2 = x + width;
  87     m_clipY2 = y + height;
  88 }
  89
  90 void wxDC::DestroyClippingRegion()
  91 {
  92     m_clipping = FALSE;
  93 }
  94
  95 void wxDC::DoGetSize( int* width, int* height ) const
  96 {
  97     if ( width )
  98         *width = m_maxX - m_minX;
  99     if ( height )
 100         *height = m_maxY - m_minY;
 101 }
 102
 103 void wxDC::DoGetSizeMM( int* width, int* height ) const
 104 {
 105     int w, h;
 106     GetSize( &w, &h );
 107
 108     if ( width )
 109         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
 110     if ( height )
 111         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
 112 }
 113
 114 // Resolution in pixels per logical inch
 115 wxSize wxDC::GetPPI() const
 116 {
 117     // TODO (should probably be pure virtual)
 118     return wxSize(0, 0);
 119 }
 120
 121 void wxDC::SetMapMode( int mode )
 122 {
 123     switch (mode)
 124     {
 125     case wxMM_TWIPS:
 126         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 127         break;
 128     case wxMM_POINTS:
 129         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 130         break;
 131     case wxMM_METRIC:
 132         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 133         break;
 134     case wxMM_LOMETRIC:
 135         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 136         break;
 137     default:
 138     case wxMM_TEXT:
 139         SetLogicalScale( 1.0, 1.0 );
 140         break;
 141     }
 142     if (mode != wxMM_TEXT)
 143     {
 144         m_needComputeScaleX = TRUE;
 145         m_needComputeScaleY = TRUE;
 146     }
 147 }
 148
 149 void wxDC::SetUserScale( double x, double y )
 150 {
 151     // allow negative ? -> no
 152     m_userScaleX = x;
 153     m_userScaleY = y;
 154     ComputeScaleAndOrigin();
 155 }
 156
 157 void wxDC::SetLogicalScale( double x, double y )
 158 {
 159     // allow negative ?
 160     m_logicalScaleX = x;
 161     m_logicalScaleY = y;
 162     ComputeScaleAndOrigin();
 163 }
 164
 165 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 166 {
 167     m_logicalOriginX = x * m_signX;   // is this still correct ?
 168     m_logicalOriginY = y * m_signY;
 169     ComputeScaleAndOrigin();
 170 }
 171
 172 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 173 {
 174     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 175     m_deviceOriginX = x;
 176     m_deviceOriginY = y;
 177     ComputeScaleAndOrigin();
 178 }
 179
 180 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 181 {
 182     m_signX = xLeftRight ?  1 : -1;
 183     m_signY = yBottomUp  ? -1 :  1;
 184     ComputeScaleAndOrigin();
 185 }
 186
 187 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 188 {
 189   return ((wxDC *)this)->XDEV2LOG(x);
 190 }
 191
 192 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 193 {
 194   return ((wxDC *)this)->YDEV2LOG(y);
 195 }
 196
 197 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 198 {
 199   return ((wxDC *)this)->XDEV2LOGREL(x);
 200 }
 201
 202 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 203 {
 204   return ((wxDC *)this)->YDEV2LOGREL(y);
 205 }
 206
 207 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 208 {
 209   return ((wxDC *)this)->XLOG2DEV(x);
 210 }
 211
 212 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 213 {
 214   return ((wxDC *)this)->YLOG2DEV(y);
 215 }
 216
 217 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 218 {
 219   return ((wxDC *)this)->XLOG2DEVREL(x);
 220 }
 221
 222 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 223 {
 224   return ((wxDC *)this)->YLOG2DEVREL(y);
 225 }
 226
 227 void wxDC::ComputeScaleAndOrigin()
 228 {
 229     m_scaleX = m_logicalScaleX * m_userScaleX;
 230     m_scaleY = m_logicalScaleY * m_userScaleY;
 231 }
 232