1///////////////////////////////////////////////////////////////////////////// 2// Name: dc.cpp 3// Purpose: 4// Author: Robert Roebling 5// RCS-ID: $Id: dc.cpp 40682 2006-08-19 21:30:06Z PC $ 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//----------------------------------------------------------------------------- 16// wxDC 17//----------------------------------------------------------------------------- 18 19IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase) 20 21wxDC::wxDC() 22{ 23 m_ok = FALSE; 24 25 m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() / 26 (double)wxGetDisplaySizeMM().GetWidth(); 27 m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() / 28 (double)wxGetDisplaySizeMM().GetHeight(); 29 30 m_needComputeScaleX = FALSE; /* not used yet */ 31 m_needComputeScaleY = FALSE; /* not used yet */ 32 33 m_logicalFunction = wxCOPY; 34 35 m_pen = *wxBLACK_PEN; 36 m_font = *wxNORMAL_FONT; 37 m_brush = *wxWHITE_BRUSH; 38} 39 40void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height ) 41{ 42 m_clipping = TRUE; 43 m_clipX1 = x; 44 m_clipY1 = y; 45 m_clipX2 = x + width; 46 m_clipY2 = y + height; 47} 48 49// --------------------------------------------------------------------------- 50// get DC capabilities 51// --------------------------------------------------------------------------- 52 53void wxDC::DoGetSizeMM( int* width, int* height ) const 54{ 55 int w = 0; 56 int h = 0; 57 GetSize( &w, &h ); 58 if (width) *width = int( double(w) / (m_userScaleX*m_mm_to_pix_x) ); 59 if (height) *height = int( double(h) / (m_userScaleY*m_mm_to_pix_y) ); 60} 61 62// Resolution in pixels per logical inch 63wxSize wxDC::GetPPI() const 64{ 65 // TODO (should probably be pure virtual) 66 return wxSize(0, 0); 67} 68 69// --------------------------------------------------------------------------- 70// set various DC parameters 71// --------------------------------------------------------------------------- 72 73void wxDC::ComputeScaleAndOrigin() 74{ 75 m_scaleX = m_logicalScaleX * m_userScaleX; 76 m_scaleY = m_logicalScaleY * m_userScaleY; 77} 78 79void wxDC::SetMapMode( int mode ) 80{ 81 switch (mode) 82 { 83 case wxMM_TWIPS: 84 SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y ); 85 break; 86 case wxMM_POINTS: 87 SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y ); 88 break; 89 case wxMM_METRIC: 90 SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y ); 91 break; 92 case wxMM_LOMETRIC: 93 SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 ); 94 break; 95 default: 96 case wxMM_TEXT: 97 SetLogicalScale( 1.0, 1.0 ); 98 break; 99 } 100 m_mappingMode = mode; 101 102/* we don't do this mega optimisation 103 if (mode != wxMM_TEXT) 104 { 105 m_needComputeScaleX = TRUE; 106 m_needComputeScaleY = TRUE; 107 } 108*/ 109} 110 111void wxDC::SetUserScale( double x, double y ) 112{ 113 // allow negative ? -> no 114 m_userScaleX = x; 115 m_userScaleY = y; 116 ComputeScaleAndOrigin(); 117} 118 119void wxDC::SetLogicalScale( double x, double y ) 120{ 121 // allow negative ? 122 m_logicalScaleX = x; 123 m_logicalScaleY = y; 124 ComputeScaleAndOrigin(); 125} 126 127void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y ) 128{ 129 m_logicalOriginX = x * m_signX; // is this still correct ? 130 m_logicalOriginY = y * m_signY; 131 ComputeScaleAndOrigin(); 132} 133 134void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y ) 135{ 136 // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there 137 m_deviceOriginX = x; 138 m_deviceOriginY = y; 139 ComputeScaleAndOrigin(); 140} 141 142void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp ) 143{ 144 // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there 145 m_signX = (xLeftRight ? 1 : -1); 146 m_signY = (yBottomUp ? -1 : 1); 147 ComputeScaleAndOrigin(); 148} 149