wxWidgets/include/wx/gtk/dc.h

162 lines
4.8 KiB
C++

/////////////////////////////////////////////////////////////////////////////
// Name: dc.h
// Purpose:
// Author: Robert Roebling
// Id: $Id$
// Copyright: (c) 1998 Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef __GTKDCH__
#define __GTKDCH__
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma interface
#endif
//-----------------------------------------------------------------------------
// classes
//-----------------------------------------------------------------------------
class wxDC;
//-----------------------------------------------------------------------------
// constants
//-----------------------------------------------------------------------------
#ifndef MM_TEXT
#define MM_TEXT 0
#define MM_ISOTROPIC 1
#define MM_ANISOTROPIC 2
#define MM_LOMETRIC 3
#define MM_HIMETRIC 4
#define MM_TWIPS 5
#define MM_POINTS 6
#define MM_METRIC 7
#endif
//-----------------------------------------------------------------------------
// wxDC
//-----------------------------------------------------------------------------
class wxDC : public wxDCBase
{
public:
wxDC();
~wxDC() { }
void SetColourMap( const wxPalette& palette ) { SetPalette(palette); };
// Resolution in pixels per logical inch
virtual wxSize GetPPI() const;
virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return true; }
virtual void EndDoc() { }
virtual void StartPage() { }
virtual void EndPage() { }
virtual void SetMapMode( int mode );
virtual void SetUserScale( double x, double y );
virtual void SetLogicalScale( double x, double y );
virtual void SetLogicalOrigin( wxCoord x, wxCoord y );
virtual void SetDeviceOrigin( wxCoord x, wxCoord y );
virtual void SetAxisOrientation( bool xLeftRight, bool yBottomUp );
// implementation
// --------------
virtual void ComputeScaleAndOrigin();
wxCoord XDEV2LOG(wxCoord x) const
{
wxCoord new_x = x - m_deviceOriginX;
if (new_x > 0)
return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
else
return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
}
wxCoord XDEV2LOGREL(wxCoord x) const
{
if (x > 0)
return (wxCoord)((double)(x) / m_scaleX + 0.5);
else
return (wxCoord)((double)(x) / m_scaleX - 0.5);
}
wxCoord YDEV2LOG(wxCoord y) const
{
wxCoord new_y = y - m_deviceOriginY;
if (new_y > 0)
return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
else
return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
}
wxCoord YDEV2LOGREL(wxCoord y) const
{
if (y > 0)
return (wxCoord)((double)(y) / m_scaleY + 0.5);
else
return (wxCoord)((double)(y) / m_scaleY - 0.5);
}
wxCoord XLOG2DEV(wxCoord x) const
{
wxCoord new_x = x - m_logicalOriginX;
if (new_x > 0)
return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
else
return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
}
wxCoord XLOG2DEVREL(wxCoord x) const
{
if (x > 0)
return (wxCoord)((double)(x) * m_scaleX + 0.5);
else
return (wxCoord)((double)(x) * m_scaleX - 0.5);
}
wxCoord YLOG2DEV(wxCoord y) const
{
wxCoord new_y = y - m_logicalOriginY;
if (new_y > 0)
return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
else
return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
}
wxCoord YLOG2DEVREL(wxCoord y) const
{
if (y > 0)
return (wxCoord)((double)(y) * m_scaleY + 0.5);
else
return (wxCoord)((double)(y) * m_scaleY - 0.5);
}
protected:
// base class pure virtuals implemented here
virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
virtual void DoGetSizeMM(int* width, int* height) const;
public:
// GTK-specific member variables
// not sure what for, but what is a mm on a screen you don't know the size
// of?
double m_mm_to_pix_x,
m_mm_to_pix_y;
bool m_needComputeScaleX,
m_needComputeScaleY; // not yet used
private:
DECLARE_ABSTRACT_CLASS(wxDC)
};
// this must be defined when wxDC::Blit() honours the DC origian and needed to
// allow wxUniv code in univ/winuniv.cpp to work with versions of wxGTK
// 2.3.[23]
#ifndef wxHAS_WORKING_GTK_DC_BLIT
#define wxHAS_WORKING_GTK_DC_BLIT
#endif
#endif // __GTKDCH__