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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #pragma once
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34
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35 #include "../Viewport/CairoContext.h"
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36
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37 namespace OrthancStone
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38 {
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39 // Not thread-safe
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40 class ViewportGeometry
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41 {
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42 private:
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43 // Extent of the scene (in world units)
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44 double x1_;
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45 double y1_;
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46 double x2_;
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47 double y2_;
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48
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49 // Size of the display (in pixels)
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50 unsigned int width_;
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51 unsigned int height_;
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52
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53 // Zoom/pan
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54 double zoom_;
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55 double panX_; // In pixels (display units)
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56 double panY_;
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57
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58 cairo_matrix_t transform_; // Scene-to-display transformation
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59
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60 void ComputeTransform();
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61
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62 public:
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63 ViewportGeometry();
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64
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65 void SetDisplaySize(unsigned int width,
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66 unsigned int height);
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67
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68 void SetSceneExtent(double x1,
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69 double y1,
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70 double x2,
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71 double y2);
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72
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73 void GetSceneExtent(double& x1,
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74 double& y1,
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75 double& x2,
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76 double& y2) const;
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77
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78 void MapDisplayToScene(double& sceneX /* out */,
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79 double& sceneY /* out */,
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80 double x,
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81 double y) const;
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82
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83 void MapSceneToDisplay(int& displayX /* out */,
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84 int& displayY /* out */,
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85 double x,
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86 double y) const;
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87
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88 unsigned int GetDisplayWidth() const
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89 {
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90 return width_;
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91 }
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92
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93 unsigned int GetDisplayHeight() const
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94 {
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95 return height_;
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96 }
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97
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98 double GetZoom() const
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99 {
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100 return zoom_;
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101 }
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102
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103 void SetDefaultView();
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104
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105 void ApplyTransform(CairoContext& context) const;
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106
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107 void GetPan(double& x,
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108 double& y) const;
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109
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110 void SetPan(double x,
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111 double y);
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112
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113 void SetZoom(double zoom);
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114 };
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115 }
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