src/gtk/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifdef __GNUG__
  12     #pragma implementation "dc.h"
  13 #endif
  14
  15 #include "wx/dc.h"
  16
  17 #include <gdk/gdk.h>
  18 #include <gtk/gtk.h>
  19
  20 //-----------------------------------------------------------------------------
  21 // constants
  22 //-----------------------------------------------------------------------------
  23
  24 #define mm2inches        0.0393700787402
  25 #define inches2mm        25.4
  26 #define mm2twips         56.6929133859
  27 #define twips2mm         0.0176388888889
  28 #define mm2pt            2.83464566929
  29 #define pt2mm            0.352777777778
  30
  31 //-----------------------------------------------------------------------------
  32 // wxDC
  33 //-----------------------------------------------------------------------------
  34
  35 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
  36
  37 wxDC::wxDC()
  38 {
  39     m_ok = FALSE;
  40
  41     m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
  42                     (double)wxGetDisplaySizeMM().GetWidth();
  43     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
  44                     (double)wxGetDisplaySizeMM().GetHeight();
  45
  46     m_needComputeScaleX = FALSE; /* not used yet */
  47     m_needComputeScaleY = FALSE; /* not used yet */
  48
  49     m_logicalFunction = wxCOPY;
  50
  51     m_pen = *wxBLACK_PEN;
  52     m_font = *wxNORMAL_FONT;
  53     m_brush = *wxWHITE_BRUSH;
  54 }
  55
  56 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  57 {
  58     m_clipping = TRUE;
  59     m_clipX1 = x;
  60     m_clipY1 = y;
  61     m_clipX2 = x + width;
  62     m_clipY2 = y + height;
  63 }
  64
  65 void wxDC::DestroyClippingRegion()
  66 {
  67     m_clipping = FALSE;
  68 }
  69
  70 // ---------------------------------------------------------------------------
  71 // get DC capabilities
  72 // ---------------------------------------------------------------------------
  73
  74 void wxDC::DoGetSizeMM( int* width, int* height ) const
  75 {
  76     int w = 0;
  77     int h = 0;
  78     GetSize( &w, &h );
  79     if (width) *width = int( double(w) / (m_userScaleX*m_mm_to_pix_x) );
  80     if (height) *height = int( double(h) / (m_userScaleY*m_mm_to_pix_y) );
  81 }
  82
  83 // Resolution in pixels per logical inch
  84 wxSize wxDC::GetPPI() const
  85 {
  86     // TODO (should probably be pure virtual)
  87     return wxSize(0, 0);
  88 }
  89
  90 // ---------------------------------------------------------------------------
  91 // set various DC parameters
  92 // ---------------------------------------------------------------------------
  93
  94 void wxDC::ComputeScaleAndOrigin()
  95 {
  96     m_scaleX = m_logicalScaleX * m_userScaleX;
  97     m_scaleY = m_logicalScaleY * m_userScaleY;
  98 }
  99
 100 void wxDC::SetMapMode( int mode )
 101 {
 102     switch (mode)
 103     {
 104         case wxMM_TWIPS:
 105           SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 106           break;
 107         case wxMM_POINTS:
 108           SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 109           break;
 110         case wxMM_METRIC:
 111           SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 112           break;
 113         case wxMM_LOMETRIC:
 114           SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 115           break;
 116         default:
 117         case wxMM_TEXT:
 118           SetLogicalScale( 1.0, 1.0 );
 119           break;
 120     }
 121     m_mappingMode = mode;
 122
 123 /*  we don't do this mega optimisation
 124     if (mode != wxMM_TEXT)
 125     {
 126         m_needComputeScaleX = TRUE;
 127         m_needComputeScaleY = TRUE;
 128     }
 129 */
 130 }
 131
 132 void wxDC::SetUserScale( double x, double y )
 133 {
 134     // allow negative ? -> no
 135     m_userScaleX = x;
 136     m_userScaleY = y;
 137     ComputeScaleAndOrigin();
 138 }
 139
 140 void wxDC::SetLogicalScale( double x, double y )
 141 {
 142     // allow negative ?
 143     m_logicalScaleX = x;
 144     m_logicalScaleY = y;
 145     ComputeScaleAndOrigin();
 146 }
 147
 148 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 149 {
 150     m_logicalOriginX = x * m_signX;   // is this still correct ?
 151     m_logicalOriginY = y * m_signY;
 152     ComputeScaleAndOrigin();
 153 }
 154
 155 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 156 {
 157     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 158     m_deviceOriginX = x;
 159     m_deviceOriginY = y;
 160     ComputeScaleAndOrigin();
 161 }
 162
 163 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 164 {
 165     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 166     m_signX = (xLeftRight ?  1 : -1);
 167     m_signY = (yBottomUp  ? -1 :  1);
 168     ComputeScaleAndOrigin();
 169 }
 170
 171 // ---------------------------------------------------------------------------
 172 // coordinates transformations
 173 // ---------------------------------------------------------------------------
 174
 175 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 176 {
 177     return ((wxDC *)this)->XDEV2LOG(x);
 178 }
 179
 180 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 181 {
 182     return ((wxDC *)this)->YDEV2LOG(y);
 183 }
 184
 185 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 186 {
 187     return ((wxDC *)this)->XDEV2LOGREL(x);
 188 }
 189
 190 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 191 {
 192     return ((wxDC *)this)->YDEV2LOGREL(y);
 193 }
 194
 195 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 196 {
 197     return ((wxDC *)this)->XLOG2DEV(x);
 198 }
 199
 200 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 201 {
 202     return ((wxDC *)this)->YLOG2DEV(y);
 203 }
 204
 205 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 206 {
 207     return ((wxDC *)this)->XLOG2DEVREL(x);
 208 }
 209
 210 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 211 {
 212     return ((wxDC *)this)->YLOG2DEVREL(y);
 213 }
 214