1 /////////////////////////////////////////////////////////////////////////////
2 // Name: dc.cpp
3 // Purpose:
4 // Author: Robert Roebling
5 // RCS-ID: $Id: dc.cpp 35650 2005-09-23 12:56:45Z MR $
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
IMPLEMENT_ABSTRACT_CLASS(wxDC,wxDCBase)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
DoSetClippingRegion(wxCoord x,wxCoord y,wxCoord width,wxCoord height)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
DoGetSizeMM(int * width,int * height) const56 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
GetPPI() const66 wxSize wxDC::GetPPI() const
67 {
68 // TODO (should probably be pure virtual)
69 return wxSize(0, 0);
70 }
71
72 // ---------------------------------------------------------------------------
73 // set various DC parameters
74 // ---------------------------------------------------------------------------
75
ComputeScaleAndOrigin()76 void wxDC::ComputeScaleAndOrigin()
77 {
78 m_scaleX = m_logicalScaleX * m_userScaleX;
79 m_scaleY = m_logicalScaleY * m_userScaleY;
80 }
81
SetMapMode(int mode)82 void wxDC::SetMapMode( int mode )
83 {
84 switch (mode)
85 {
86 case wxMM_TWIPS:
87 SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
88 break;
89 case wxMM_POINTS:
90 SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
91 break;
92 case wxMM_METRIC:
93 SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
94 break;
95 case wxMM_LOMETRIC:
96 SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
97 break;
98 default:
99 case wxMM_TEXT:
100 SetLogicalScale( 1.0, 1.0 );
101 break;
102 }
103 m_mappingMode = mode;
104
105 /* we don't do this mega optimisation
106 if (mode != wxMM_TEXT)
107 {
108 m_needComputeScaleX = TRUE;
109 m_needComputeScaleY = TRUE;
110 }
111 */
112 }
113
SetUserScale(double x,double y)114 void wxDC::SetUserScale( double x, double y )
115 {
116 // allow negative ? -> no
117 m_userScaleX = x;
118 m_userScaleY = y;
119 ComputeScaleAndOrigin();
120 }
121
SetLogicalScale(double x,double y)122 void wxDC::SetLogicalScale( double x, double y )
123 {
124 // allow negative ?
125 m_logicalScaleX = x;
126 m_logicalScaleY = y;
127 ComputeScaleAndOrigin();
128 }
129
SetLogicalOrigin(wxCoord x,wxCoord y)130 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
131 {
132 m_logicalOriginX = x * m_signX; // is this still correct ?
133 m_logicalOriginY = y * m_signY;
134 ComputeScaleAndOrigin();
135 }
136
SetDeviceOrigin(wxCoord x,wxCoord y)137 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
138 {
139 // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
140 m_deviceOriginX = x;
141 m_deviceOriginY = y;
142 ComputeScaleAndOrigin();
143 }
144
SetAxisOrientation(bool xLeftRight,bool yBottomUp)145 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
146 {
147 // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
148 m_signX = (xLeftRight ? 1 : -1);
149 m_signY = (yBottomUp ? -1 : 1);
150 ComputeScaleAndOrigin();
151 }
152
153 // ---------------------------------------------------------------------------
154 // coordinates transformations
155 // ---------------------------------------------------------------------------
156
DeviceToLogicalX(wxCoord x) const157 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
158 {
159 return ((wxDC *)this)->XDEV2LOG(x);
160 }
161
DeviceToLogicalY(wxCoord y) const162 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
163 {
164 return ((wxDC *)this)->YDEV2LOG(y);
165 }
166
DeviceToLogicalXRel(wxCoord x) const167 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
168 {
169 return ((wxDC *)this)->XDEV2LOGREL(x);
170 }
171
DeviceToLogicalYRel(wxCoord y) const172 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
173 {
174 return ((wxDC *)this)->YDEV2LOGREL(y);
175 }
176
LogicalToDeviceX(wxCoord x) const177 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
178 {
179 return ((wxDC *)this)->XLOG2DEV(x);
180 }
181
LogicalToDeviceY(wxCoord y) const182 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
183 {
184 return ((wxDC *)this)->YLOG2DEV(y);
185 }
186
LogicalToDeviceXRel(wxCoord x) const187 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
188 {
189 return ((wxDC *)this)->XLOG2DEVREL(x);
190 }
191
LogicalToDeviceYRel(wxCoord y) const192 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
193 {
194 return ((wxDC *)this)->YLOG2DEVREL(y);
195 }
196
197