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 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     // Resolution in pixels per logical inch
  50     virtual wxSize GetPPI() const;
  51
  52     virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return TRUE; }
  53     virtual void EndDoc() { }
  54     virtual void StartPage() { }
  55     virtual void EndPage() { }
  56
  57     virtual void SetMapMode( int mode );
  58     virtual void SetUserScale( double x, double y );
  59     virtual void SetLogicalScale( double x, double y );
  60     virtual void SetLogicalOrigin( wxCoord x, wxCoord y );
  61     virtual void SetDeviceOrigin( wxCoord x, wxCoord y );
  62
  63     virtual void SetAxisOrientation( bool xLeftRight, bool yBottomUp );
  64
  65     // implementation
  66     // --------------
  67
  68     virtual void ComputeScaleAndOrigin();
  69
  70     wxCoord XDEV2LOG(wxCoord x) const
  71     {
  72         wxCoord new_x = x - m_deviceOriginX;
  73         if (new_x > 0)
  74             return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
  75         else
  76             return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
  77     }
  78     wxCoord XDEV2LOGREL(wxCoord x) const
  79     {
  80         if (x > 0)
  81             return (wxCoord)((double)(x) / m_scaleX + 0.5);
  82         else
  83             return (wxCoord)((double)(x) / m_scaleX - 0.5);
  84     }
  85     wxCoord YDEV2LOG(wxCoord y) const
  86     {
  87         wxCoord new_y = y - m_deviceOriginY;
  88         if (new_y > 0)
  89             return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
  90         else
  91             return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
  92     }
  93     wxCoord YDEV2LOGREL(wxCoord y) const
  94     {
  95         if (y > 0)
  96             return (wxCoord)((double)(y) / m_scaleY + 0.5);
  97         else
  98             return (wxCoord)((double)(y) / m_scaleY - 0.5);
  99     }
 100     wxCoord XLOG2DEV(wxCoord x) const
 101     {
 102         wxCoord new_x = x - m_logicalOriginX;
 103         if (new_x > 0)
 104             return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 105         else
 106             return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 107     }
 108     wxCoord XLOG2DEVREL(wxCoord x) const
 109     {
 110         if (x > 0)
 111             return (wxCoord)((double)(x) * m_scaleX + 0.5);
 112         else
 113             return (wxCoord)((double)(x) * m_scaleX - 0.5);
 114     }
 115     wxCoord YLOG2DEV(wxCoord y) const
 116     {
 117         wxCoord new_y = y - m_logicalOriginY;
 118         if (new_y > 0)
 119             return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 120         else
 121             return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 122     }
 123     wxCoord YLOG2DEVREL(wxCoord y) const
 124     {
 125         if (y > 0)
 126             return (wxCoord)((double)(y) * m_scaleY + 0.5);
 127         else
 128             return (wxCoord)((double)(y) * m_scaleY - 0.5);
 129     }
 130
 131 protected:
 132     // base class pure virtuals implemented here
 133     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 134     virtual void DoGetSizeMM(int* width, int* height) const;
 135
 136 public:
 137     // GTK-specific member variables
 138
 139     // not sure what for, but what is a mm on a screen you don't know the size
 140     // of?
 141     double       m_mm_to_pix_x,
 142                  m_mm_to_pix_y;
 143
 144     bool         m_needComputeScaleX,
 145                  m_needComputeScaleY; // not yet used
 146
 147
 148 private:
 149     DECLARE_ABSTRACT_CLASS(wxDC)
 150 };
 151
 152 // this must be defined when wxDC::Blit() honours the DC origian and needed to
 153 // allow wxUniv code in univ/winuniv.cpp to work with versions of wxGTK
 154 // 2.3.[23]
 155 #ifndef wxHAS_WORKING_GTK_DC_BLIT
 156     #define wxHAS_WORKING_GTK_DC_BLIT
 157 #endif
 158
 159 #endif // __GTKDCH__