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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
11 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
12 #pragma implementation "dc.h"
13 #endif
14
15 // For compilers that support precompilation, includes "wx.h".
16 #include "wx/wxprec.h"
17
18 #include "wx/dc.h"
19
20 #include <gdk/gdk.h>
21 #include <gtk/gtk.h>
22
23 //-----------------------------------------------------------------------------
24 // constants
25 //-----------------------------------------------------------------------------
26
27 #define mm2inches 0.0393700787402
28 #define inches2mm 25.4
29 #define mm2twips 56.6929133859
30 #define twips2mm 0.0176388888889
31 #define mm2pt 2.83464566929
32 #define pt2mm 0.352777777778
33
34 //-----------------------------------------------------------------------------
35 // wxDC
36 //-----------------------------------------------------------------------------
37
38 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
39
40 wxDC::wxDC()
41 {
42 m_ok = FALSE;
43
44 m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
45 (double)wxGetDisplaySizeMM().GetWidth();
46 m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
47 (double)wxGetDisplaySizeMM().GetHeight();
48
49 m_needComputeScaleX = FALSE; /* not used yet */
50 m_needComputeScaleY = FALSE; /* not used yet */
51
52 m_logicalFunction = wxCOPY;
53
54 m_pen = *wxBLACK_PEN;
55 m_font = *wxNORMAL_FONT;
56 m_brush = *wxWHITE_BRUSH;
57 }
58
59 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
60 {
61 m_clipping = TRUE;
62 m_clipX1 = x;
63 m_clipY1 = y;
64 m_clipX2 = x + width;
65 m_clipY2 = y + height;
66 }
67
68 // ---------------------------------------------------------------------------
69 // get DC capabilities
70 // ---------------------------------------------------------------------------
71
72 void wxDC::DoGetSizeMM( int* width, int* height ) const
73 {
74 int w = 0;
75 int h = 0;
76 GetSize( &w, &h );
77 if (width) *width = int( double(w) / (m_userScaleX*m_mm_to_pix_x) );
78 if (height) *height = int( double(h) / (m_userScaleY*m_mm_to_pix_y) );
79 }
80
81 // Resolution in pixels per logical inch
82 wxSize wxDC::GetPPI() const
83 {
84 // TODO (should probably be pure virtual)
85 return wxSize(0, 0);
86 }
87
88 // ---------------------------------------------------------------------------
89 // set various DC parameters
90 // ---------------------------------------------------------------------------
91
92 void wxDC::ComputeScaleAndOrigin()
93 {
94 m_scaleX = m_logicalScaleX * m_userScaleX;
95 m_scaleY = m_logicalScaleY * m_userScaleY;
96 }
97
98 void wxDC::SetMapMode( int mode )
99 {
100 switch (mode)
101 {
102 case wxMM_TWIPS:
103 SetLogicalScale( twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y );
104 break;
105 case wxMM_POINTS:
106 SetLogicalScale( pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y );
107 break;
108 case wxMM_METRIC:
109 SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
110 break;
111 case wxMM_LOMETRIC:
112 SetLogicalScale( m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0 );
113 break;
114 default:
115 case wxMM_TEXT:
116 SetLogicalScale( 1.0, 1.0 );
117 break;
118 }
119 m_mappingMode = mode;
120
121 /* we don't do this mega optimisation
122 if (mode != wxMM_TEXT)
123 {
124 m_needComputeScaleX = TRUE;
125 m_needComputeScaleY = TRUE;
126 }
127 */
128 }
129
130 void wxDC::SetUserScale( double x, double y )
131 {
132 // allow negative ? -> no
133 m_userScaleX = x;
134 m_userScaleY = y;
135 ComputeScaleAndOrigin();
136 }
137
138 void wxDC::SetLogicalScale( double x, double y )
139 {
140 // allow negative ?
141 m_logicalScaleX = x;
142 m_logicalScaleY = y;
143 ComputeScaleAndOrigin();
144 }
145
146 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
147 {
148 m_logicalOriginX = x * m_signX; // is this still correct ?
149 m_logicalOriginY = y * m_signY;
150 ComputeScaleAndOrigin();
151 }
152
153 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
154 {
155 // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
156 m_deviceOriginX = x;
157 m_deviceOriginY = y;
158 ComputeScaleAndOrigin();
159 }
160
161 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
162 {
163 // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
164 m_signX = (xLeftRight ? 1 : -1);
165 m_signY = (yBottomUp ? -1 : 1);
166 ComputeScaleAndOrigin();
167 }
168
169 // ---------------------------------------------------------------------------
170 // coordinates transformations
171 // ---------------------------------------------------------------------------
172
173 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
174 {
175 return ((wxDC *)this)->XDEV2LOG(x);
176 }
177
178 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
179 {
180 return ((wxDC *)this)->YDEV2LOG(y);
181 }
182
183 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
184 {
185 return ((wxDC *)this)->XDEV2LOGREL(x);
186 }
187
188 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
189 {
190 return ((wxDC *)this)->YDEV2LOGREL(y);
191 }
192
193 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
194 {
195 return ((wxDC *)this)->XLOG2DEV(x);
196 }
197
198 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
199 {
200 return ((wxDC *)this)->YLOG2DEV(y);
201 }
202
203 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
204 {
205 return ((wxDC *)this)->XLOG2DEVREL(x);
206 }
207
208 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
209 {
210 return ((wxDC *)this)->YLOG2DEVREL(y);
211 }
212