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::DoGetSize( int* width, int* height ) const
  94 {
  95     if ( width )
  96         *width = m_maxX - m_minX;
  97     if ( height )
  98         *height = m_maxY - m_minY;
  99 }
 100
 101 void wxDC::DoGetSizeMM( int* width, int* height ) const
 102 {
 103     int w, h;
 104     GetSize( &w, &h );
 105
 106     if ( width )
 107         *width = int( double(w) / (m_scaleX*m_mm_to_pix_x) );
 108     if ( height )
 109         *height = int( double(h) / (m_scaleY*m_mm_to_pix_y) );
 110 }
 111
 112 // Resolution in pixels per logical inch
 113 wxSize wxDC::GetPPI() const
 114 {
 115     // TODO (should probably be pure virtual)
 116     return wxSize(0, 0);
 117 }
 118
 119 void wxDC::SetMapMode( int mode )
 120 {
 121     switch (mode)
 122     {
 123     case wxMM_TWIPS:
 124         SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
 125         break;
 126     case wxMM_POINTS:
 127         SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
 128         break;
 129     case wxMM_METRIC:
 130         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 131         break;
 132     case wxMM_LOMETRIC:
 133         SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
 134         break;
 135     default:
 136     case wxMM_TEXT:
 137         SetLogicalScale( 1.0, 1.0 );
 138         break;
 139     }
 140     if (mode != wxMM_TEXT)
 141     {
 142         m_needComputeScaleX = TRUE;
 143         m_needComputeScaleY = TRUE;
 144     }
 145 }
 146
 147 void wxDC::SetUserScale( double x, double y )
 148 {
 149     // allow negative ? -> no
 150     m_userScaleX = x;
 151     m_userScaleY = y;
 152     ComputeScaleAndOrigin();
 153 }
 154
 155 void wxDC::SetLogicalScale( double x, double y )
 156 {
 157     // allow negative ?
 158     m_logicalScaleX = x;
 159     m_logicalScaleY = y;
 160     ComputeScaleAndOrigin();
 161 }
 162
 163 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 164 {
 165     m_logicalOriginX = x * m_signX;   // is this still correct ?
 166     m_logicalOriginY = y * m_signY;
 167     ComputeScaleAndOrigin();
 168 }
 169
 170 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 171 {
 172     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 173     m_deviceOriginX = x;
 174     m_deviceOriginY = y;
 175     ComputeScaleAndOrigin();
 176 }
 177
 178 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 179 {
 180     m_signX = xLeftRight ?  1 : -1;
 181     m_signY = yBottomUp  ? -1 :  1;
 182     ComputeScaleAndOrigin();
 183 }
 184
 185 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 186 {
 187   return ((wxDC *)this)->XDEV2LOG(x);
 188 }
 189
 190 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 191 {
 192   return ((wxDC *)this)->YDEV2LOG(y);
 193 }
 194
 195 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 196 {
 197   return ((wxDC *)this)->XDEV2LOGREL(x);
 198 }
 199
 200 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 201 {
 202   return ((wxDC *)this)->YDEV2LOGREL(y);
 203 }
 204
 205 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 206 {
 207   return ((wxDC *)this)->XLOG2DEV(x);
 208 }
 209
 210 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 211 {
 212   return ((wxDC *)this)->YLOG2DEV(y);
 213 }
 214
 215 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 216 {
 217   return ((wxDC *)this)->XLOG2DEVREL(x);
 218 }
 219
 220 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 221 {
 222   return ((wxDC *)this)->YLOG2DEVREL(y);
 223 }
 224
 225 void wxDC::ComputeScaleAndOrigin()
 226 {
 227     m_scaleX = m_logicalScaleX * m_userScaleX;
 228     m_scaleY = m_logicalScaleY * m_userScaleY;
 229 }
 230