include/wx/gtk/dc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.h
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifndef __GTKDCH__
  12 #define __GTKDCH__
  13
  14 #ifdef __GNUG__
  15 #pragma interface
  16 #endif
  17
  18 //-----------------------------------------------------------------------------
  19 // classes
  20 //-----------------------------------------------------------------------------
  21
  22 class wxDC;
  23
  24 //-----------------------------------------------------------------------------
  25 // constants
  26 //-----------------------------------------------------------------------------
  27
  28 #define MM_TEXT         0
  29 #define MM_ISOTROPIC    1
  30 #define MM_ANISOTROPIC  2
  31 #define MM_LOMETRIC     3
  32 #define MM_HIMETRIC     4
  33 #define MM_TWIPS        5
  34 #define MM_POINTS       6
  35 #define MM_METRIC       7
  36
  37 //-----------------------------------------------------------------------------
  38 // wxDC
  39 //-----------------------------------------------------------------------------
  40
  41 class wxDC : public wxDCBase
  42 {
  43     DECLARE_ABSTRACT_CLASS(wxDC)
  44
  45 public:
  46     wxDC();
  47     ~wxDC() { }
  48
  49     void SetColourMap( const wxPalette& palette ) { SetPalette(palette); };
  50
  51     // the first two must be overridden and called
  52     virtual void DestroyClippingRegion();
  53
  54     // Resolution in pixels per logical inch
  55     virtual wxSize GetPPI() const;
  56
  57     virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return TRUE; }
  58     virtual void EndDoc() { }
  59     virtual void StartPage() { }
  60     virtual void EndPage() { }
  61
  62     virtual void SetMapMode( int mode );
  63     virtual void SetUserScale( double x, double y );
  64     virtual void SetLogicalScale( double x, double y );
  65     virtual void SetLogicalOrigin( long x, long y );
  66     virtual void SetDeviceOrigin( long x, long y );
  67
  68     virtual void SetAxisOrientation( bool xLeftRight, bool yBottomUp );
  69
  70     // implementation
  71     // --------------
  72
  73     void ComputeScaleAndOrigin();
  74
  75     long XDEV2LOG(long x) const
  76     {
  77         long new_x = x - m_deviceOriginX;
  78         if (new_x > 0)
  79             return (long)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
  80         else
  81             return (long)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
  82     }
  83     long XDEV2LOGREL(long x) const
  84     {
  85         if (x > 0)
  86             return (long)((double)(x) / m_scaleX + 0.5);
  87         else
  88             return (long)((double)(x) / m_scaleX - 0.5);
  89     }
  90     long YDEV2LOG(long y) const
  91     {
  92         long new_y = y - m_deviceOriginY;
  93         if (new_y > 0)
  94             return (long)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
  95         else
  96             return (long)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
  97     }
  98     long YDEV2LOGREL(long y) const
  99     {
 100         if (y > 0)
 101             return (long)((double)(y) / m_scaleY + 0.5);
 102         else
 103             return (long)((double)(y) / m_scaleY - 0.5);
 104     }
 105     long XLOG2DEV(long x) const
 106     {
 107         long new_x = x - m_logicalOriginX;
 108         if (new_x > 0)
 109             return (long)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 110         else
 111             return (long)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 112     }
 113     long XLOG2DEVREL(long x) const
 114     {
 115         if (x > 0)
 116             return (long)((double)(x) * m_scaleX + 0.5);
 117         else
 118             return (long)((double)(x) * m_scaleX - 0.5);
 119     }
 120     long YLOG2DEV(long y) const
 121     {
 122         long new_y = y - m_logicalOriginY;
 123         if (new_y > 0)
 124             return (long)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 125         else
 126             return (long)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 127     }
 128     long YLOG2DEVREL(long y) const
 129     {
 130         if (y > 0)
 131             return (long)((double)(y) * m_scaleY + 0.5);
 132         else
 133             return (long)((double)(y) * m_scaleY - 0.5);
 134     }
 135
 136 protected:
 137     // base class pure virtuals implemented here
 138     virtual void DoSetClippingRegion(long x, long y, long width, long height);
 139     virtual void DoGetSize(int *width, int *height) const;
 140     virtual void DoGetSizeMM(int* width, int* height) const;
 141
 142 public:
 143     // GTK-specific member variables
 144
 145     // not sure what for, but what is a mm on a screen you don't know the size
 146     // of?
 147     double       m_mm_to_pix_x,
 148                  m_mm_to_pix_y;
 149
 150     bool         m_needComputeScaleX,
 151                  m_needComputeScaleY; // not yet used
 152
 153     float        m_scaleFactor;  // wxPSDC wants to have this. Will disappear.
 154 };
 155
 156 #endif // __GTKDCH__