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