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 #ifndef __GTKDCH__
  11 #define __GTKDCH__
  12
  13 //-----------------------------------------------------------------------------
  14 // classes
  15 //-----------------------------------------------------------------------------
  16
  17 class WXDLLIMPEXP_CORE wxDC;
  18
  19 //-----------------------------------------------------------------------------
  20 // constants
  21 //-----------------------------------------------------------------------------
  22
  23 #ifndef MM_TEXT
  24 #define MM_TEXT         0
  25 #define MM_ISOTROPIC    1
  26 #define MM_ANISOTROPIC  2
  27 #define MM_LOMETRIC     3
  28 #define MM_HIMETRIC     4
  29 #define MM_TWIPS        5
  30 #define MM_POINTS       6
  31 #define MM_METRIC       7
  32 #endif
  33
  34 //-----------------------------------------------------------------------------
  35 // wxDC
  36 //-----------------------------------------------------------------------------
  37
  38 class WXDLLIMPEXP_CORE wxDC : public wxDCBase
  39 {
  40 public:
  41     wxDC();
  42     ~wxDC() { }
  43
  44     void SetColourMap( const wxPalette& palette ) { SetPalette(palette); };
  45
  46     // Resolution in pixels per logical inch
  47     virtual wxSize GetPPI() const;
  48
  49     virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return true; }
  50     virtual void EndDoc() { }
  51     virtual void StartPage() { }
  52     virtual void EndPage() { }
  53
  54     virtual void SetMapMode( int mode );
  55     virtual void SetUserScale( double x, double y );
  56     virtual void SetLogicalScale( double x, double y );
  57     virtual void SetLogicalOrigin( wxCoord x, wxCoord y );
  58     virtual void SetDeviceOrigin( wxCoord x, wxCoord y );
  59
  60     virtual void SetAxisOrientation( bool xLeftRight, bool yBottomUp );
  61
  62     // implementation
  63     // --------------
  64
  65     virtual void ComputeScaleAndOrigin();
  66
  67     wxCoord XDEV2LOG(wxCoord x) const
  68     {
  69         wxCoord new_x = x - m_deviceOriginX;
  70         if (new_x > 0)
  71             return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
  72         else
  73             return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
  74     }
  75     wxCoord XDEV2LOGREL(wxCoord x) const
  76     {
  77         if (x > 0)
  78             return (wxCoord)((double)(x) / m_scaleX + 0.5);
  79         else
  80             return (wxCoord)((double)(x) / m_scaleX - 0.5);
  81     }
  82     wxCoord YDEV2LOG(wxCoord y) const
  83     {
  84         wxCoord new_y = y - m_deviceOriginY;
  85         if (new_y > 0)
  86             return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
  87         else
  88             return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
  89     }
  90     wxCoord YDEV2LOGREL(wxCoord y) const
  91     {
  92         if (y > 0)
  93             return (wxCoord)((double)(y) / m_scaleY + 0.5);
  94         else
  95             return (wxCoord)((double)(y) / m_scaleY - 0.5);
  96     }
  97     wxCoord XLOG2DEV(wxCoord x) const
  98     {
  99         wxCoord new_x = x - m_logicalOriginX;
 100         if (new_x > 0)
 101             return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 102         else
 103             return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 104     }
 105     wxCoord XLOG2DEVREL(wxCoord x) const
 106     {
 107         if (x > 0)
 108             return (wxCoord)((double)(x) * m_scaleX + 0.5);
 109         else
 110             return (wxCoord)((double)(x) * m_scaleX - 0.5);
 111     }
 112     wxCoord YLOG2DEV(wxCoord y) const
 113     {
 114         wxCoord new_y = y - m_logicalOriginY;
 115         if (new_y > 0)
 116             return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 117         else
 118             return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 119     }
 120     wxCoord YLOG2DEVREL(wxCoord y) const
 121     {
 122         if (y > 0)
 123             return (wxCoord)((double)(y) * m_scaleY + 0.5);
 124         else
 125             return (wxCoord)((double)(y) * m_scaleY - 0.5);
 126     }
 127
 128 protected:
 129     // base class pure virtuals implemented here
 130     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 131     virtual void DoGetSizeMM(int* width, int* height) const;
 132
 133 public:
 134     // GTK-specific member variables
 135
 136     // not sure what for, but what is a mm on a screen you don't know the size
 137     // of?
 138     double       m_mm_to_pix_x,
 139                  m_mm_to_pix_y;
 140
 141     bool         m_needComputeScaleX,
 142                  m_needComputeScaleY; // not yet used
 143
 144
 145 private:
 146     DECLARE_ABSTRACT_CLASS(wxDC)
 147 };
 148
 149 // this must be defined when wxDC::Blit() honours the DC origian and needed to
 150 // allow wxUniv code in univ/winuniv.cpp to work with versions of wxGTK
 151 // 2.3.[23]
 152 #ifndef wxHAS_WORKING_GTK_DC_BLIT
 153     #define wxHAS_WORKING_GTK_DC_BLIT
 154 #endif
 155
 156 #endif // __GTKDCH__