src/motif/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.cpp
   3 // Purpose:     wxDC class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13     #pragma implementation "dc.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #include "wx/dc.h"
  20 #include "wx/dcmemory.h"
  21 #include "wx/defs.h"
  22
  23     IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  24
  25 //-----------------------------------------------------------------------------
  26 // constants
  27 //-----------------------------------------------------------------------------
  28
  29 #define mm2inches        0.0393700787402
  30 #define inches2mm        25.4
  31 #define mm2twips         56.6929133859
  32 #define twips2mm         0.0176388888889
  33 #define mm2pt            2.83464566929
  34 #define pt2mm            0.352777777778
  35
  36 //-----------------------------------------------------------------------------
  37 // wxDC
  38 //-----------------------------------------------------------------------------
  39
  40 wxDC::wxDC()
  41 {
  42     m_ok = FALSE;
  43
  44     m_mm_to_pix_x = 1.0;
  45     m_mm_to_pix_y = 1.0;
  46
  47     m_backgroundMode = wxTRANSPARENT;
  48
  49     m_isInteractive = FALSE;
  50 }
  51
  52 void wxDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y)
  53 {
  54     wxCHECK_RET( Ok(), "invalid dc" );
  55     wxCHECK_RET( icon.Ok(), "invalid icon" );
  56
  57     DoDrawBitmap(icon, x, y, TRUE);
  58 }
  59
  60 void wxDC::DoDrawBitmap( const wxBitmap& bitmap, wxCoord x, wxCoord y, bool useMask )
  61 {
  62     wxCHECK_RET( bitmap.Ok(), "invalid bitmap" );
  63
  64     wxMemoryDC memDC;
  65     memDC.SelectObject(bitmap);
  66
  67 #if 0
  68     // Not sure if we need this. The mask should leave the masked areas as per
  69     // the original background of this DC.
  70     if (useMask)
  71     {
  72         // There might be transparent areas, so make these the same colour as this
  73         // DC
  74         memDC.SetBackground(* GetBackground());
  75         memDC.Clear();
  76     }
  77 #endif // 0
  78
  79     Blit(x, y, bitmap.GetWidth(), bitmap.GetHeight(), &memDC, 0, 0, wxCOPY, useMask);
  80
  81     memDC.SelectObject(wxNullBitmap);
  82 }
  83
  84 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  85 {
  86     m_clipping = TRUE;
  87     m_clipX1 = x;
  88     m_clipY1 = y;
  89     m_clipX2 = x + width;
  90     m_clipY2 = y + height;
  91 }
  92
  93 void wxDC::DestroyClippingRegion()
  94 {
  95     m_clipping = FALSE;
  96 }
  97
  98 void wxDC::DoGetSize( int* width, int* height ) const
  99 {
 100     if ( width )
 101         *width = m_maxX - m_minX;
 102     if ( height )
 103         *height = m_maxY - m_minY;
 104 }
 105
 106 void wxDC::DoGetSizeMM( int* width, int* height ) const
 107 {
 108     int w, h;
 109     GetSize( &w, &h );
 110
 111     if ( width )
 112         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
 113     if ( height )
 114         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
 115 }
 116
 117 // Resolution in pixels per logical inch
 118 wxSize wxDC::GetPPI() const
 119 {
 120     // TODO (should probably be pure virtual)
 121     return wxSize(0, 0);
 122 }
 123
 124 void wxDC::SetMapMode( int mode )
 125 {
 126     switch (mode)
 127     {
 128     case wxMM_TWIPS:
 129         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 130         break;
 131     case wxMM_POINTS:
 132         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 133         break;
 134     case wxMM_METRIC:
 135         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 136         break;
 137     case wxMM_LOMETRIC:
 138         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 139         break;
 140     default:
 141     case wxMM_TEXT:
 142         SetLogicalScale( 1.0, 1.0 );
 143         break;
 144     }
 145     if (mode != wxMM_TEXT)
 146     {
 147         m_needComputeScaleX = TRUE;
 148         m_needComputeScaleY = TRUE;
 149     }
 150 }
 151
 152 void wxDC::SetUserScale( double x, double y )
 153 {
 154     // allow negative ? -> no
 155     m_userScaleX = x;
 156     m_userScaleY = y;
 157     ComputeScaleAndOrigin();
 158 }
 159
 160 void wxDC::SetLogicalScale( double x, double y )
 161 {
 162     // allow negative ?
 163     m_logicalScaleX = x;
 164     m_logicalScaleY = y;
 165     ComputeScaleAndOrigin();
 166 }
 167
 168 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 169 {
 170     m_logicalOriginX = x * m_signX;   // is this still correct ?
 171     m_logicalOriginY = y * m_signY;
 172     ComputeScaleAndOrigin();
 173 }
 174
 175 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 176 {
 177     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 178     m_deviceOriginX = x;
 179     m_deviceOriginY = y;
 180     ComputeScaleAndOrigin();
 181 }
 182
 183 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 184 {
 185     m_signX = xLeftRight ?  1 : -1;
 186     m_signY = yBottomUp  ? -1 :  1;
 187     ComputeScaleAndOrigin();
 188 }
 189
 190 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 191 {
 192   return ((wxDC *)this)->XDEV2LOG(x);
 193 }
 194
 195 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 196 {
 197   return ((wxDC *)this)->YDEV2LOG(y);
 198 }
 199
 200 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 201 {
 202   return ((wxDC *)this)->XDEV2LOGREL(x);
 203 }
 204
 205 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 206 {
 207   return ((wxDC *)this)->YDEV2LOGREL(y);
 208 }
 209
 210 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 211 {
 212   return ((wxDC *)this)->XLOG2DEV(x);
 213 }
 214
 215 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 216 {
 217   return ((wxDC *)this)->YLOG2DEV(y);
 218 }
 219
 220 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 221 {
 222   return ((wxDC *)this)->XLOG2DEVREL(x);
 223 }
 224
 225 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 226 {
 227   return ((wxDC *)this)->YLOG2DEVREL(y);
 228 }
 229
 230 void wxDC::ComputeScaleAndOrigin()
 231 {
 232     m_scaleX = m_logicalScaleX * m_userScaleX;
 233     m_scaleY = m_logicalScaleY * m_userScaleY;
 234 }
 235