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 = *wxTRANSPARENT_BRUSH;
  52 }
  53
  54 void wxDC::DoSetClippingRegion( long x, long y, long width, long 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     // CMB: copy scale to see if it changes
 101     double origScaleX = m_scaleX;
 102     double origScaleY = m_scaleY;
 103
 104     m_scaleX = m_logicalScaleX * m_userScaleX;
 105     m_scaleY = m_logicalScaleY * m_userScaleY;
 106
 107     // CMB: if scale has changed call SetPen to recalulate the line width
 108     if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 109     {
 110       // this is a bit artificial, but we need to force wxDC to think
 111       // the pen has changed
 112         // It gives an Assert, Robert Roebling
 113 /*
 114       wxPen pen = m_pen;
 115       m_pen = wxNullPen;
 116       SetPen( pen );
 117 */
 118   }
 119 }
 120
 121 void wxDC::SetMapMode( int mode )
 122 {
 123     switch (mode)
 124     {
 125         case wxMM_TWIPS:
 126           SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 127           break;
 128         case wxMM_POINTS:
 129           SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 130           break;
 131         case wxMM_METRIC:
 132           SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 133           break;
 134         case wxMM_LOMETRIC:
 135           SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 136           break;
 137         default:
 138         case wxMM_TEXT:
 139           SetLogicalScale( 1.0, 1.0 );
 140           break;
 141     }
 142 /*  we don't do this mega optimisation
 143     if (mode != wxMM_TEXT)
 144     {
 145         m_needComputeScaleX = TRUE;
 146         m_needComputeScaleY = TRUE;
 147     }
 148 */
 149 }
 150
 151 void wxDC::SetUserScale( double x, double y )
 152 {
 153     // allow negative ? -> no
 154     m_userScaleX = x;
 155     m_userScaleY = y;
 156     ComputeScaleAndOrigin();
 157 }
 158
 159 void wxDC::SetLogicalScale( double x, double y )
 160 {
 161     // allow negative ?
 162     m_logicalScaleX = x;
 163     m_logicalScaleY = y;
 164     ComputeScaleAndOrigin();
 165 }
 166
 167 void wxDC::SetLogicalOrigin( long x, long y )
 168 {
 169     m_logicalOriginX = x * m_signX;   // is this still correct ?
 170     m_logicalOriginY = y * m_signY;
 171     ComputeScaleAndOrigin();
 172 }
 173
 174 void wxDC::SetDeviceOrigin( long x, long y )
 175 {
 176     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 177     m_deviceOriginX = x;
 178     m_deviceOriginY = y;
 179     ComputeScaleAndOrigin();
 180 }
 181
 182 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 183 {
 184     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 185     m_signX = (xLeftRight ?  1 : -1);
 186     m_signY = (yBottomUp  ? -1 :  1);
 187     ComputeScaleAndOrigin();
 188 }
 189
 190 // ---------------------------------------------------------------------------
 191 // coordinates transformations
 192 // ---------------------------------------------------------------------------
 193
 194 long wxDCBase::DeviceToLogicalX(long x) const
 195 {
 196     return ((wxDC *)this)->XDEV2LOG(x);
 197 }
 198
 199 long wxDCBase::DeviceToLogicalY(long y) const
 200 {
 201     return ((wxDC *)this)->YDEV2LOG(y);
 202 }
 203
 204 long wxDCBase::DeviceToLogicalXRel(long x) const
 205 {
 206     return ((wxDC *)this)->XDEV2LOGREL(x);
 207 }
 208
 209 long wxDCBase::DeviceToLogicalYRel(long y) const
 210 {
 211     return ((wxDC *)this)->YDEV2LOGREL(y);
 212 }
 213
 214 long wxDCBase::LogicalToDeviceX(long x) const
 215 {
 216     return ((wxDC *)this)->XLOG2DEV(x);
 217 }
 218
 219 long wxDCBase::LogicalToDeviceY(long y) const
 220 {
 221     return ((wxDC *)this)->YLOG2DEV(y);
 222 }
 223
 224 long wxDCBase::LogicalToDeviceXRel(long x) const
 225 {
 226     return ((wxDC *)this)->XLOG2DEVREL(x);
 227 }
 228
 229 long wxDCBase::LogicalToDeviceYRel(long y) const
 230 {
 231     return ((wxDC *)this)->YLOG2DEVREL(y);
 232 }
 233