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, Markus Holzem
   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 = 1.0;
  42     m_mm_to_pix_y = 1.0;
  43
  44     m_needComputeScaleX = FALSE; /* not used yet */
  45     m_needComputeScaleY = FALSE; /* not used yet */
  46
  47     m_logicalFunction = wxCOPY;
  48
  49     m_pen = *wxBLACK_PEN;
  50     m_font = *wxNORMAL_FONT;
  51     m_brush = *wxWHITE_BRUSH;
  52 }
  53
  54 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  55 {
  56     m_clipping = TRUE;
  57     m_clipX1 = x;
  58     m_clipY1 = y;
  59     m_clipX2 = x + width;
  60     m_clipY2 = y + height;
  61 }
  62
  63 void wxDC::DestroyClippingRegion()
  64 {
  65     m_clipping = FALSE;
  66 }
  67
  68 // ---------------------------------------------------------------------------
  69 // get DC capabilities
  70 // ---------------------------------------------------------------------------
  71
  72 void wxDC::DoGetSize( int* width, int* height ) const
  73 {
  74     if (width) *width = m_maxX-m_minX;
  75     if (height) *height = m_maxY-m_minY;
  76 }
  77
  78 void wxDC::DoGetSizeMM( int* width, int* height ) const
  79 {
  80     int w = 0;
  81     int h = 0;
  82     GetSize( &w, &h );
  83     if (width) *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
  84     if (height) *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
  85 }
  86
  87 // Resolution in pixels per logical inch
  88 wxSize wxDC::GetPPI() const
  89 {
  90     // TODO (should probably be pure virtual)
  91     return wxSize(0, 0);
  92 }
  93
  94 // ---------------------------------------------------------------------------
  95 // set various DC parameters
  96 // ---------------------------------------------------------------------------
  97
  98 void wxDC::ComputeScaleAndOrigin()
  99 {
 100     m_scaleX = m_logicalScaleX * m_userScaleX;
 101     m_scaleY = m_logicalScaleY * m_userScaleY;
 102 }
 103
 104 void wxDC::SetMapMode( int mode )
 105 {
 106     switch (mode)
 107     {
 108         case wxMM_TWIPS:
 109           SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 110           break;
 111         case wxMM_POINTS:
 112           SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 113           break;
 114         case wxMM_METRIC:
 115           SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 116           break;
 117         case wxMM_LOMETRIC:
 118           SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 119           break;
 120         default:
 121         case wxMM_TEXT:
 122           SetLogicalScale( 1.0, 1.0 );
 123           break;
 124     }
 125     m_mappingMode = mode;
 126
 127 /*  we don't do this mega optimisation
 128     if (mode != wxMM_TEXT)
 129     {
 130         m_needComputeScaleX = TRUE;
 131         m_needComputeScaleY = TRUE;
 132     }
 133 */
 134 }
 135
 136 void wxDC::SetUserScale( double x, double y )
 137 {
 138     // allow negative ? -> no
 139     m_userScaleX = x;
 140     m_userScaleY = y;
 141     ComputeScaleAndOrigin();
 142 }
 143
 144 void wxDC::SetLogicalScale( double x, double y )
 145 {
 146     // allow negative ?
 147     m_logicalScaleX = x;
 148     m_logicalScaleY = y;
 149     ComputeScaleAndOrigin();
 150 }
 151
 152 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 153 {
 154     m_logicalOriginX = x * m_signX;   // is this still correct ?
 155     m_logicalOriginY = y * m_signY;
 156     ComputeScaleAndOrigin();
 157 }
 158
 159 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 160 {
 161     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 162     m_deviceOriginX = x;
 163     m_deviceOriginY = y;
 164     ComputeScaleAndOrigin();
 165 }
 166
 167 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 168 {
 169     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 170     m_signX = (xLeftRight ?  1 : -1);
 171     m_signY = (yBottomUp  ? -1 :  1);
 172     ComputeScaleAndOrigin();
 173 }
 174
 175 // ---------------------------------------------------------------------------
 176 // coordinates transformations
 177 // ---------------------------------------------------------------------------
 178
 179 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 180 {
 181     return ((wxDC *)this)->XDEV2LOG(x);
 182 }
 183
 184 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 185 {
 186     return ((wxDC *)this)->YDEV2LOG(y);
 187 }
 188
 189 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 190 {
 191     return ((wxDC *)this)->XDEV2LOGREL(x);
 192 }
 193
 194 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 195 {
 196     return ((wxDC *)this)->YDEV2LOGREL(y);
 197 }
 198
 199 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 200 {
 201     return ((wxDC *)this)->XLOG2DEV(x);
 202 }
 203
 204 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 205 {
 206     return ((wxDC *)this)->YLOG2DEV(y);
 207 }
 208
 209 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 210 {
 211     return ((wxDC *)this)->XLOG2DEVREL(x);
 212 }
 213
 214 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 215 {
 216     return ((wxDC *)this)->YLOG2DEVREL(y);
 217 }
 218