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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  15 #pragma interface
  16 #endif
  17
  18 //-----------------------------------------------------------------------------
  19 // classes
  20 //-----------------------------------------------------------------------------
  21
  22 class WXDLLIMPEXP_CORE wxDC;
  23
  24 //-----------------------------------------------------------------------------
  25 // constants
  26 //-----------------------------------------------------------------------------
  27
  28 #ifndef MM_TEXT
  29 #define MM_TEXT         0
  30 #define MM_ISOTROPIC    1
  31 #define MM_ANISOTROPIC  2
  32 #define MM_LOMETRIC     3
  33 #define MM_HIMETRIC     4
  34 #define MM_TWIPS        5
  35 #define MM_POINTS       6
  36 #define MM_METRIC       7
  37 #endif
  38
  39 //-----------------------------------------------------------------------------
  40 // wxDC
  41 //-----------------------------------------------------------------------------
  42
  43 class WXDLLIMPEXP_CORE wxDC : public wxDCBase
  44 {
  45 public:
  46     wxDC();
  47     ~wxDC() { }
  48
  49     void SetColourMap( const wxPalette& palette ) { SetPalette(palette); };
  50
  51     // Resolution in pixels per logical inch
  52     virtual wxSize GetPPI() const;
  53
  54     virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return true; }
  55     virtual void EndDoc() { }
  56     virtual void StartPage() { }
  57     virtual void EndPage() { }
  58
  59     virtual void SetMapMode( int mode );
  60     virtual void SetUserScale( double x, double y );
  61     virtual void SetLogicalScale( double x, double y );
  62     virtual void SetLogicalOrigin( wxCoord x, wxCoord y );
  63     virtual void SetDeviceOrigin( wxCoord x, wxCoord y );
  64
  65     virtual void SetAxisOrientation( bool xLeftRight, bool yBottomUp );
  66
  67     // implementation
  68     // --------------
  69
  70     virtual void ComputeScaleAndOrigin();
  71
  72     wxCoord XDEV2LOG(wxCoord x) const
  73     {
  74         wxCoord new_x = x - m_deviceOriginX;
  75         if (new_x > 0)
  76             return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
  77         else
  78             return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
  79     }
  80     wxCoord XDEV2LOGREL(wxCoord x) const
  81     {
  82         if (x > 0)
  83             return (wxCoord)((double)(x) / m_scaleX + 0.5);
  84         else
  85             return (wxCoord)((double)(x) / m_scaleX - 0.5);
  86     }
  87     wxCoord YDEV2LOG(wxCoord y) const
  88     {
  89         wxCoord new_y = y - m_deviceOriginY;
  90         if (new_y > 0)
  91             return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
  92         else
  93             return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
  94     }
  95     wxCoord YDEV2LOGREL(wxCoord y) const
  96     {
  97         if (y > 0)
  98             return (wxCoord)((double)(y) / m_scaleY + 0.5);
  99         else
 100             return (wxCoord)((double)(y) / m_scaleY - 0.5);
 101     }
 102     wxCoord XLOG2DEV(wxCoord x) const
 103     {
 104         wxCoord new_x = x - m_logicalOriginX;
 105         if (new_x > 0)
 106             return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 107         else
 108             return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 109     }
 110     wxCoord XLOG2DEVREL(wxCoord x) const
 111     {
 112         if (x > 0)
 113             return (wxCoord)((double)(x) * m_scaleX + 0.5);
 114         else
 115             return (wxCoord)((double)(x) * m_scaleX - 0.5);
 116     }
 117     wxCoord YLOG2DEV(wxCoord y) const
 118     {
 119         wxCoord new_y = y - m_logicalOriginY;
 120         if (new_y > 0)
 121             return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 122         else
 123             return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 124     }
 125     wxCoord YLOG2DEVREL(wxCoord y) const
 126     {
 127         if (y > 0)
 128             return (wxCoord)((double)(y) * m_scaleY + 0.5);
 129         else
 130             return (wxCoord)((double)(y) * m_scaleY - 0.5);
 131     }
 132
 133 protected:
 134     // base class pure virtuals implemented here
 135     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 136     virtual void DoGetSizeMM(int* width, int* height) const;
 137
 138 public:
 139     // GTK-specific member variables
 140
 141     // not sure what for, but what is a mm on a screen you don't know the size
 142     // of?
 143     double       m_mm_to_pix_x,
 144                  m_mm_to_pix_y;
 145
 146     bool         m_needComputeScaleX,
 147                  m_needComputeScaleY; // not yet used
 148
 149
 150 private:
 151     DECLARE_ABSTRACT_CLASS(wxDC)
 152 };
 153
 154 // this must be defined when wxDC::Blit() honours the DC origian and needed to
 155 // allow wxUniv code in univ/winuniv.cpp to work with versions of wxGTK
 156 // 2.3.[23]
 157 #ifndef wxHAS_WORKING_GTK_DC_BLIT
 158     #define wxHAS_WORKING_GTK_DC_BLIT
 159 #endif
 160
 161 #endif // __GTKDCH__