src/gtk1/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/dc.h"
  14
  15 #include <gdk/gdk.h>
  16 #include <gtk/gtk.h>
  17
  18 //-----------------------------------------------------------------------------
  19 // wxDC
  20 //-----------------------------------------------------------------------------
  21
  22 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
  23
  24 wxDC::wxDC()
  25 {
  26     m_ok = FALSE;
  27
  28     m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
  29                     (double)wxGetDisplaySizeMM().GetWidth();
  30     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
  31                     (double)wxGetDisplaySizeMM().GetHeight();
  32
  33     m_needComputeScaleX = FALSE; /* not used yet */
  34     m_needComputeScaleY = FALSE; /* not used yet */
  35
  36     m_logicalFunction = wxCOPY;
  37
  38     m_pen = *wxBLACK_PEN;
  39     m_font = *wxNORMAL_FONT;
  40     m_brush = *wxWHITE_BRUSH;
  41 }
  42
  43 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
  44 {
  45     m_clipping = TRUE;
  46     m_clipX1 = x;
  47     m_clipY1 = y;
  48     m_clipX2 = x + width;
  49     m_clipY2 = y + height;
  50 }
  51
  52 // ---------------------------------------------------------------------------
  53 // get DC capabilities
  54 // ---------------------------------------------------------------------------
  55
  56 void wxDC::DoGetSizeMM( int* width, int* height ) const
  57 {
  58     int w = 0;
  59     int h = 0;
  60     GetSize( &w, &h );
  61     if (width) *width = int( double(w) / (m_userScaleX*m_mm_to_pix_x) );
  62     if (height) *height = int( double(h) / (m_userScaleY*m_mm_to_pix_y) );
  63 }
  64
  65 // Resolution in pixels per logical inch
  66 wxSize wxDC::GetPPI() const
  67 {
  68     // TODO (should probably be pure virtual)
  69     return wxSize(0, 0);
  70 }
  71