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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12     #pragma implementation "dc.h"
  13 #endif
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #include "wx/dc.h"
  19
  20 #include <gdk/gdk.h>
  21 #include <gtk/gtk.h>
  22
  23 //-----------------------------------------------------------------------------
  24 // constants
  25 //-----------------------------------------------------------------------------
  26
  27 #define mm2inches        0.0393700787402
  28 #define inches2mm        25.4
  29 #define mm2twips         56.6929133859
  30 #define twips2mm         0.0176388888889
  31 #define mm2pt            2.83464566929
  32 #define pt2mm            0.352777777778
  33
  34 //-----------------------------------------------------------------------------
  35 // wxDC
  36 //-----------------------------------------------------------------------------
  37
  38 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
  39
  40 wxDC::wxDC()
  41 {
  42     m_ok = FALSE;
  43
  44     m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
  45                     (double)wxGetDisplaySizeMM().GetWidth();
  46     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
  47                     (double)wxGetDisplaySizeMM().GetHeight();
  48
  49     m_needComputeScaleX = FALSE; /* not used yet */
  50     m_needComputeScaleY = FALSE; /* not used yet */
  51
  52     m_logicalFunction = wxCOPY;
  53
  54     m_pen = *wxBLACK_PEN;
  55     m_font = *wxNORMAL_FONT;
  56     m_brush = *wxWHITE_BRUSH;
  57 }
  58
  59 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  60 {
  61     m_clipping = TRUE;
  62     m_clipX1 = x;
  63     m_clipY1 = y;
  64     m_clipX2 = x + width;
  65     m_clipY2 = y + height;
  66 }
  67
  68 void wxDC::DestroyClippingRegion()
  69 {
  70     m_clipping = FALSE;
  71 }
  72
  73 // ---------------------------------------------------------------------------
  74 // get DC capabilities
  75 // ---------------------------------------------------------------------------
  76
  77 void wxDC::DoGetSizeMM( int* width, int* height ) const
  78 {
  79     int w = 0;
  80     int h = 0;
  81     GetSize( &w, &h );
  82     if (width) *width = int( double(w) / (m_userScaleX*m_mm_to_pix_x) );
  83     if (height) *height = int( double(h) / (m_userScaleY*m_mm_to_pix_y) );
  84 }
  85
  86 // Resolution in pixels per logical inch
  87 wxSize wxDC::GetPPI() const
  88 {
  89     // TODO (should probably be pure virtual)
  90     return wxSize(0, 0);
  91 }
  92
  93 // ---------------------------------------------------------------------------
  94 // set various DC parameters
  95 // ---------------------------------------------------------------------------
  96
  97 void wxDC::ComputeScaleAndOrigin()
  98 {
  99     m_scaleX = m_logicalScaleX * m_userScaleX;
 100     m_scaleY = m_logicalScaleY * m_userScaleY;
 101 }
 102
 103 void wxDC::SetMapMode( int mode )
 104 {
 105     switch (mode)
 106     {
 107         case wxMM_TWIPS:
 108           SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 109           break;
 110         case wxMM_POINTS:
 111           SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 112           break;
 113         case wxMM_METRIC:
 114           SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 115           break;
 116         case wxMM_LOMETRIC:
 117           SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 118           break;
 119         default:
 120         case wxMM_TEXT:
 121           SetLogicalScale( 1.0, 1.0 );
 122           break;
 123     }
 124     m_mappingMode = mode;
 125
 126 /*  we don't do this mega optimisation
 127     if (mode != wxMM_TEXT)
 128     {
 129         m_needComputeScaleX = TRUE;
 130         m_needComputeScaleY = TRUE;
 131     }
 132 */
 133 }
 134
 135 void wxDC::SetUserScale( double x, double y )
 136 {
 137     // allow negative ? -> no
 138     m_userScaleX = x;
 139     m_userScaleY = y;
 140     ComputeScaleAndOrigin();
 141 }
 142
 143 void wxDC::SetLogicalScale( double x, double y )
 144 {
 145     // allow negative ?
 146     m_logicalScaleX = x;
 147     m_logicalScaleY = y;
 148     ComputeScaleAndOrigin();
 149 }
 150
 151 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 152 {
 153     m_logicalOriginX = x * m_signX;   // is this still correct ?
 154     m_logicalOriginY = y * m_signY;
 155     ComputeScaleAndOrigin();
 156 }
 157
 158 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 159 {
 160     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 161     m_deviceOriginX = x;
 162     m_deviceOriginY = y;
 163     ComputeScaleAndOrigin();
 164 }
 165
 166 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 167 {
 168     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 169     m_signX = (xLeftRight ?  1 : -1);
 170     m_signY = (yBottomUp  ? -1 :  1);
 171     ComputeScaleAndOrigin();
 172 }
 173
 174 // ---------------------------------------------------------------------------
 175 // coordinates transformations
 176 // ---------------------------------------------------------------------------
 177
 178 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 179 {
 180     return ((wxDC *)this)->XDEV2LOG(x);
 181 }
 182
 183 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 184 {
 185     return ((wxDC *)this)->YDEV2LOG(y);
 186 }
 187
 188 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 189 {
 190     return ((wxDC *)this)->XDEV2LOGREL(x);
 191 }
 192
 193 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 194 {
 195     return ((wxDC *)this)->YDEV2LOGREL(y);
 196 }
 197
 198 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 199 {
 200     return ((wxDC *)this)->XLOG2DEV(x);
 201 }
 202
 203 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 204 {
 205     return ((wxDC *)this)->YLOG2DEV(y);
 206 }
 207
 208 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 209 {
 210     return ((wxDC *)this)->XLOG2DEVREL(x);
 211 }
 212
 213 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 214 {
 215     return ((wxDC *)this)->YLOG2DEVREL(y);
 216 }
 217