Mercurial > hg > orthanc-stone
comparison Framework/Toolbox/ViewportGeometry.cpp @ 0:351ab0da0150
initial commit
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 14 Oct 2016 15:34:11 +0200 |
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children | ff1e935768e7 |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #include "ViewportGeometry.h" | |
34 | |
35 #include "../Orthanc/Core/Logging.h" | |
36 #include "../Orthanc/Core/OrthancException.h" | |
37 | |
38 #include <boost/math/special_functions/round.hpp> | |
39 | |
40 namespace OrthancStone | |
41 { | |
42 void ViewportGeometry::ComputeTransform() | |
43 { | |
44 // The following lines must be read in reverse order! | |
45 cairo_matrix_t tmp; | |
46 | |
47 // Bring the center of the scene to the center of the view | |
48 cairo_matrix_init_translate(&transform_, | |
49 panX_ + static_cast<double>(width_) / 2.0, | |
50 panY_ + static_cast<double>(height_) / 2.0); | |
51 | |
52 // Apply the zoom around (0,0) | |
53 cairo_matrix_init_scale(&tmp, zoom_, zoom_); | |
54 cairo_matrix_multiply(&transform_, &tmp, &transform_); | |
55 | |
56 // Bring the center of the scene to (0,0) | |
57 cairo_matrix_init_translate(&tmp, -(x1_ + x2_) / 2.0, -(y1_ + y2_) / 2.0); | |
58 cairo_matrix_multiply(&transform_, &tmp, &transform_); | |
59 } | |
60 | |
61 | |
62 ViewportGeometry::ViewportGeometry() | |
63 { | |
64 x1_ = 0; | |
65 y1_ = 0; | |
66 x2_ = 0; | |
67 y2_ = 0; | |
68 | |
69 width_ = 0; | |
70 height_ = 0; | |
71 | |
72 zoom_ = 1; | |
73 panX_ = 0; | |
74 panY_ = 0; | |
75 | |
76 ComputeTransform(); | |
77 } | |
78 | |
79 | |
80 void ViewportGeometry::SetDisplaySize(unsigned int width, | |
81 unsigned int height) | |
82 { | |
83 if (width_ != width || | |
84 height_ != height) | |
85 { | |
86 LOG(INFO) << "New display size: " << width << "x" << height; | |
87 | |
88 width_ = width; | |
89 height_ = height; | |
90 | |
91 ComputeTransform(); | |
92 } | |
93 } | |
94 | |
95 | |
96 void ViewportGeometry::SetSceneExtent(double x1, | |
97 double y1, | |
98 double x2, | |
99 double y2) | |
100 { | |
101 if (x1 == x1_ && | |
102 y1 == y1_ && | |
103 x2 == x2_ && | |
104 y2 == y2_) | |
105 { | |
106 return; | |
107 } | |
108 else if (x1 > x2 || | |
109 y1 > y2) | |
110 { | |
111 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); | |
112 } | |
113 else | |
114 { | |
115 LOG(INFO) << "New scene extent: (" << x1 << "," << y1 << ") => (" << x2 << "," << y2 << ")"; | |
116 | |
117 x1_ = x1; | |
118 y1_ = y1; | |
119 x2_ = x2; | |
120 y2_ = y2; | |
121 | |
122 ComputeTransform(); | |
123 } | |
124 } | |
125 | |
126 | |
127 void ViewportGeometry::GetSceneExtent(double& x1, | |
128 double& y1, | |
129 double& x2, | |
130 double& y2) const | |
131 { | |
132 x1 = x1_; | |
133 y1 = y1_; | |
134 x2 = x2_; | |
135 y2 = y2_; | |
136 } | |
137 | |
138 | |
139 void ViewportGeometry::MapDisplayToScene(double& sceneX /* out */, | |
140 double& sceneY /* out */, | |
141 double x, | |
142 double y) const | |
143 { | |
144 cairo_matrix_t transform = transform_; | |
145 | |
146 if (cairo_matrix_invert(&transform) != CAIRO_STATUS_SUCCESS) | |
147 { | |
148 LOG(ERROR) << "Cannot invert singular matrix"; | |
149 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); | |
150 } | |
151 | |
152 sceneX = x; | |
153 sceneY = y; | |
154 cairo_matrix_transform_point(&transform, &sceneX, &sceneY); | |
155 } | |
156 | |
157 | |
158 void ViewportGeometry::MapSceneToDisplay(int& displayX /* out */, | |
159 int& displayY /* out */, | |
160 double x, | |
161 double y) const | |
162 { | |
163 cairo_matrix_transform_point(&transform_, &x, &y); | |
164 | |
165 displayX = static_cast<int>(boost::math::iround(x)); | |
166 displayY = static_cast<int>(boost::math::iround(y)); | |
167 } | |
168 | |
169 | |
170 void ViewportGeometry::SetDefaultView() | |
171 { | |
172 if (width_ > 0 && | |
173 height_ > 0 && | |
174 x2_ > x1_ + 10 * std::numeric_limits<double>::epsilon() && | |
175 y2_ > y1_ + 10 * std::numeric_limits<double>::epsilon()) | |
176 { | |
177 double zoomX = static_cast<double>(width_) / (x2_ - x1_); | |
178 double zoomY = static_cast<double>(height_) / (y2_ - y1_); | |
179 zoom_ = zoomX < zoomY ? zoomX : zoomY; | |
180 | |
181 panX_ = 0; | |
182 panY_ = 0; | |
183 | |
184 ComputeTransform(); | |
185 } | |
186 } | |
187 | |
188 | |
189 void ViewportGeometry::ApplyTransform(CairoContext& context) const | |
190 { | |
191 cairo_set_matrix(context.GetObject(), &transform_); | |
192 } | |
193 | |
194 | |
195 void ViewportGeometry::GetPan(double& x, | |
196 double& y) const | |
197 { | |
198 x = panX_; | |
199 y = panY_; | |
200 } | |
201 | |
202 | |
203 void ViewportGeometry::SetPan(double x, | |
204 double y) | |
205 { | |
206 panX_ = x; | |
207 panY_ = y; | |
208 ComputeTransform(); | |
209 } | |
210 | |
211 | |
212 void ViewportGeometry::SetZoom(double zoom) | |
213 { | |
214 zoom_ = zoom; | |
215 ComputeTransform(); | |
216 } | |
217 } |