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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #if 1
  42     m_mm_to_pix_x = 1.0;
  43     m_mm_to_pix_y = 1.0;
  44 #else
  45     m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
  46                     (double)wxGetDisplaySizeMM().GetWidth();
  47     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
  48                     (double)wxGetDisplaySizeMM().GetHeight();
  49 #endif
  50
  51     m_needComputeScaleX = FALSE; /* not used yet */
  52     m_needComputeScaleY = FALSE; /* not used yet */
  53
  54     m_logicalFunction = wxCOPY;
  55
  56     m_pen = *wxBLACK_PEN;
  57     m_font = *wxNORMAL_FONT;
  58     m_brush = *wxWHITE_BRUSH;
  59
  60     m_backgroundMode = wxTRANSPARENT;
  61
  62     m_isInteractive = FALSE;  // ???
  63 }
  64
  65 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  66 {
  67     m_clipping = TRUE;
  68     m_clipX1 = x;
  69     m_clipY1 = y;
  70     m_clipX2 = x + width;
  71     m_clipY2 = y + height;
  72 }
  73
  74 void wxDC::DestroyClippingRegion()
  75 {
  76     m_clipping = FALSE;
  77 }
  78
  79 void wxDC::DoGetSizeMM( int* width, int* height ) const
  80 {
  81     int w, h;
  82     GetSize( &w, &h );
  83
  84     if ( width )
  85         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
  86     if ( height )
  87         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
  88 }
  89
  90 // Resolution in pixels per logical inch
  91 wxSize wxDC::GetPPI() const
  92 {
  93     // TODO (should probably be pure virtual)
  94     return wxSize(0, 0);
  95 }
  96
  97 void wxDC::SetMapMode( int mode )
  98 {
  99     switch (mode)
 100     {
 101     case wxMM_TWIPS:
 102         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 103         break;
 104     case wxMM_POINTS:
 105         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 106         break;
 107     case wxMM_METRIC:
 108         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 109         break;
 110     case wxMM_LOMETRIC:
 111         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 112         break;
 113     default:
 114     case wxMM_TEXT:
 115         SetLogicalScale( 1.0, 1.0 );
 116         break;
 117     }
 118     if (mode != wxMM_TEXT)
 119     {
 120         m_needComputeScaleX = TRUE;
 121         m_needComputeScaleY = TRUE;
 122     }
 123 }
 124
 125 void wxDC::SetUserScale( double x, double y )
 126 {
 127     // allow negative ? -> no
 128     m_userScaleX = x;
 129     m_userScaleY = y;
 130     ComputeScaleAndOrigin();
 131 }
 132
 133 void wxDC::SetLogicalScale( double x, double y )
 134 {
 135     // allow negative ?
 136     m_logicalScaleX = x;
 137     m_logicalScaleY = y;
 138     ComputeScaleAndOrigin();
 139 }
 140
 141 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 142 {
 143     m_logicalOriginX = x * m_signX;   // is this still correct ?
 144     m_logicalOriginY = y * m_signY;
 145     ComputeScaleAndOrigin();
 146 }
 147
 148 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 149 {
 150     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 151     m_deviceOriginX = x;
 152     m_deviceOriginY = y;
 153     ComputeScaleAndOrigin();
 154 }
 155
 156 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 157 {
 158     m_signX = xLeftRight ?  1 : -1;
 159     m_signY = yBottomUp  ? -1 :  1;
 160     ComputeScaleAndOrigin();
 161 }
 162
 163 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 164 {
 165   return ((wxDC *)this)->XDEV2LOG(x);
 166 }
 167
 168 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 169 {
 170   return ((wxDC *)this)->YDEV2LOG(y);
 171 }
 172
 173 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 174 {
 175   return ((wxDC *)this)->XDEV2LOGREL(x);
 176 }
 177
 178 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 179 {
 180   return ((wxDC *)this)->YDEV2LOGREL(y);
 181 }
 182
 183 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 184 {
 185   return ((wxDC *)this)->XLOG2DEV(x);
 186 }
 187
 188 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 189 {
 190   return ((wxDC *)this)->YLOG2DEV(y);
 191 }
 192
 193 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 194 {
 195   return ((wxDC *)this)->XLOG2DEVREL(x);
 196 }
 197
 198 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 199 {
 200   return ((wxDC *)this)->YLOG2DEVREL(y);
 201 }
 202
 203 void wxDC::ComputeScaleAndOrigin()
 204 {
 205     m_scaleX = m_logicalScaleX * m_userScaleX;
 206     m_scaleY = m_logicalScaleY * m_userScaleY;
 207 }
 208