src/gtk1/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/dc.h"
  14
  15 #include <gdk/gdk.h>
  16 #include <gtk/gtk.h>
  17
  18 //-----------------------------------------------------------------------------
  19 // wxDC
  20 //-----------------------------------------------------------------------------
  21
  22 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
  23
  24 wxDC::wxDC()
  25 {
  26     m_ok = FALSE;
  27
  28     m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
  29                     (double)wxGetDisplaySizeMM().GetWidth();
  30     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
  31                     (double)wxGetDisplaySizeMM().GetHeight();
  32
  33     m_needComputeScaleX = FALSE; /* not used yet */
  34     m_needComputeScaleY = FALSE; /* not used yet */
  35
  36     m_logicalFunction = wxCOPY;
  37
  38     m_pen = *wxBLACK_PEN;
  39     m_font = *wxNORMAL_FONT;
  40     m_brush = *wxWHITE_BRUSH;
  41 }
  42
  43 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  44 {
  45     m_clipping = TRUE;
  46     m_clipX1 = x;
  47     m_clipY1 = y;
  48     m_clipX2 = x + width;
  49     m_clipY2 = y + height;
  50 }
  51
  52 // ---------------------------------------------------------------------------
  53 // get DC capabilities
  54 // ---------------------------------------------------------------------------
  55
  56 void wxDC::DoGetSizeMM( int* width, int* height ) const
  57 {
  58     int w = 0;
  59     int h = 0;
  60     GetSize( &w, &h );
  61     if (width) *width = int( double(w) / (m_userScaleX*m_mm_to_pix_x) );
  62     if (height) *height = int( double(h) / (m_userScaleY*m_mm_to_pix_y) );
  63 }
  64
  65 // Resolution in pixels per logical inch
  66 wxSize wxDC::GetPPI() const
  67 {
  68     // TODO (should probably be pure virtual)
  69     return wxSize(0, 0);
  70 }
  71
  72 // ---------------------------------------------------------------------------
  73 // set various DC parameters
  74 // ---------------------------------------------------------------------------
  75
  76 wxCoord wxDC::DeviceToLogicalX(wxCoord x) const
  77 {
  78     return wxRound((x - m_deviceOriginX) / m_scaleX) * m_signX + m_logicalOriginX;
  79 }
  80
  81 wxCoord wxDC::DeviceToLogicalY(wxCoord y) const
  82 {
  83     return wxRound((y - m_deviceOriginY) / m_scaleY) * m_signY + m_logicalOriginY;
  84 }
  85
  86 wxCoord wxDC::DeviceToLogicalXRel(wxCoord x) const
  87 {
  88     return wxRound(x / m_scaleX);
  89 }
  90
  91 wxCoord wxDC::DeviceToLogicalYRel(wxCoord y) const
  92 {
  93     return wxRound(y / m_scaleY);
  94 }
  95
  96 wxCoord wxDC::LogicalToDeviceX(wxCoord x) const
  97 {
  98     return wxRound((x - m_logicalOriginX) * m_scaleX) * m_signX + m_deviceOriginX;
  99 }
 100
 101 wxCoord wxDC::LogicalToDeviceY(wxCoord y) const
 102 {
 103     return wxRound((y - m_logicalOriginY) * m_scaleY) * m_signY + m_deviceOriginY;
 104 }
 105
 106 wxCoord wxDC::LogicalToDeviceXRel(wxCoord x) const
 107 {
 108     return wxRound(x * m_scaleX);
 109 }
 110
 111 wxCoord wxDC::LogicalToDeviceYRel(wxCoord y) const
 112 {
 113     return wxRound(y * m_scaleY);
 114 }
 115
 116 void wxDC::ComputeScaleAndOrigin()
 117 {
 118     m_scaleX = m_logicalScaleX * m_userScaleX;
 119     m_scaleY = m_logicalScaleY * m_userScaleY;
 120 }
 121
 122 void wxDC::SetMapMode( int mode )
 123 {
 124     switch (mode)
 125     {
 126         case wxMM_TWIPS:
 127           SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 128           break;
 129         case wxMM_POINTS:
 130           SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 131           break;
 132         case wxMM_METRIC:
 133           SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 134           break;
 135         case wxMM_LOMETRIC:
 136           SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 137           break;
 138         default:
 139         case wxMM_TEXT:
 140           SetLogicalScale( 1.0, 1.0 );
 141           break;
 142     }
 143     m_mappingMode = mode;
 144
 145 /*  we don't do this mega optimisation
 146     if (mode != wxMM_TEXT)
 147     {
 148         m_needComputeScaleX = TRUE;
 149         m_needComputeScaleY = TRUE;
 150     }
 151 */
 152 }
 153
 154 void wxDC::SetUserScale( double x, double y )
 155 {
 156     // allow negative ? -> no
 157     m_userScaleX = x;
 158     m_userScaleY = y;
 159     ComputeScaleAndOrigin();
 160 }
 161
 162 void wxDC::SetLogicalScale( double x, double y )
 163 {
 164     // allow negative ?
 165     m_logicalScaleX = x;
 166     m_logicalScaleY = y;
 167     ComputeScaleAndOrigin();
 168 }
 169
 170 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 171 {
 172     m_logicalOriginX = x * m_signX;   // is this still correct ?
 173     m_logicalOriginY = y * m_signY;
 174     ComputeScaleAndOrigin();
 175 }
 176
 177 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 178 {
 179     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 180     m_deviceOriginX = x;
 181     m_deviceOriginY = y;
 182     ComputeScaleAndOrigin();
 183 }
 184
 185 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 186 {
 187     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 188     m_signX = (xLeftRight ?  1 : -1);
 189     m_signY = (yBottomUp  ? -1 :  1);
 190     ComputeScaleAndOrigin();
 191 }
 192
 193 // ---------------------------------------------------------------------------
 194 // coordinates transformations
 195 // ---------------------------------------------------------------------------
 196
 197 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 198 {
 199     return ((wxDC *)this)->XDEV2LOG(x);
 200 }
 201
 202 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 203 {
 204     return ((wxDC *)this)->YDEV2LOG(y);
 205 }
 206
 207 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 208 {
 209     return ((wxDC *)this)->XDEV2LOGREL(x);
 210 }
 211
 212 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 213 {
 214     return ((wxDC *)this)->YDEV2LOGREL(y);
 215 }
 216
 217 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 218 {
 219     return ((wxDC *)this)->XLOG2DEV(x);
 220 }
 221
 222 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 223 {
 224     return ((wxDC *)this)->YLOG2DEV(y);
 225 }
 226
 227 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 228 {
 229     return ((wxDC *)this)->XLOG2DEVREL(x);
 230 }
 231
 232 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 233 {
 234     return ((wxDC *)this)->YLOG2DEVREL(y);
 235 }
 236