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