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 public:
  44     wxDC();
  45     ~wxDC() { }
  46
  47     void SetColourMap( const wxPalette& palette ) { SetPalette(palette); };
  48
  49     // the first two must be overridden and called
  50     virtual void DestroyClippingRegion();
  51
  52     // Resolution in pixels per logical inch
  53     virtual wxSize GetPPI() const;
  54
  55     virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return TRUE; }
  56     virtual void EndDoc() { }
  57     virtual void StartPage() { }
  58     virtual void EndPage() { }
  59
  60     virtual void SetMapMode( int mode );
  61     virtual void SetUserScale( double x, double y );
  62     virtual void SetLogicalScale( double x, double y );
  63     virtual void SetLogicalOrigin( wxCoord x, wxCoord y );
  64     virtual void SetDeviceOrigin( wxCoord x, wxCoord y );
  65
  66     virtual void SetAxisOrientation( bool xLeftRight, bool yBottomUp );
  67
  68     // implementation
  69     // --------------
  70
  71     virtual void ComputeScaleAndOrigin();
  72
  73     wxCoord XDEV2LOG(wxCoord x) const
  74     {
  75         wxCoord new_x = x - m_deviceOriginX;
  76         if (new_x > 0)
  77             return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
  78         else
  79             return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
  80     }
  81     wxCoord XDEV2LOGREL(wxCoord x) const
  82     {
  83         if (x > 0)
  84             return (wxCoord)((double)(x) / m_scaleX + 0.5);
  85         else
  86             return (wxCoord)((double)(x) / m_scaleX - 0.5);
  87     }
  88     wxCoord YDEV2LOG(wxCoord y) const
  89     {
  90         wxCoord new_y = y - m_deviceOriginY;
  91         if (new_y > 0)
  92             return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
  93         else
  94             return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
  95     }
  96     wxCoord YDEV2LOGREL(wxCoord y) const
  97     {
  98         if (y > 0)
  99             return (wxCoord)((double)(y) / m_scaleY + 0.5);
 100         else
 101             return (wxCoord)((double)(y) / m_scaleY - 0.5);
 102     }
 103     wxCoord XLOG2DEV(wxCoord x) const
 104     {
 105         wxCoord new_x = x - m_logicalOriginX;
 106         if (new_x > 0)
 107             return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 108         else
 109             return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 110     }
 111     wxCoord XLOG2DEVREL(wxCoord x) const
 112     {
 113         if (x > 0)
 114             return (wxCoord)((double)(x) * m_scaleX + 0.5);
 115         else
 116             return (wxCoord)((double)(x) * m_scaleX - 0.5);
 117     }
 118     wxCoord YLOG2DEV(wxCoord y) const
 119     {
 120         wxCoord new_y = y - m_logicalOriginY;
 121         if (new_y > 0)
 122             return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 123         else
 124             return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 125     }
 126     wxCoord YLOG2DEVREL(wxCoord y) const
 127     {
 128         if (y > 0)
 129             return (wxCoord)((double)(y) * m_scaleY + 0.5);
 130         else
 131             return (wxCoord)((double)(y) * m_scaleY - 0.5);
 132     }
 133
 134 protected:
 135     // base class pure virtuals implemented here
 136     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 137     virtual void DoGetSizeMM(int* width, int* height) const;
 138
 139 public:
 140     // GTK-specific member variables
 141
 142     // not sure what for, but what is a mm on a screen you don't know the size
 143     // of?
 144     double       m_mm_to_pix_x,
 145                  m_mm_to_pix_y;
 146
 147     bool         m_needComputeScaleX,
 148                  m_needComputeScaleY; // not yet used
 149
 150
 151 private:
 152     DECLARE_ABSTRACT_CLASS(wxDC)
 153 };
 154
 155 #endif // __GTKDCH__