annotate Framework/Toolbox/ViewportGeometry.cpp @ 174:a7674c0ae4ac wasm

fix captain rt-dose
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 08 Mar 2018 20:22:47 +0100
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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 * Copyright (C) 2017-2018 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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22 #include "ViewportGeometry.h"
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24 #include <Core/Logging.h>
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25 #include <Core/OrthancException.h>
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27 #include <boost/math/special_functions/round.hpp>
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29 namespace OrthancStone
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30 {
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31 void ViewportGeometry::ComputeTransform()
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32 {
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33 // The following lines must be read in reverse order!
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34 cairo_matrix_t tmp;
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36 // Bring the center of the scene to the center of the view
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37 cairo_matrix_init_translate(&transform_,
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38 panX_ + static_cast<double>(width_) / 2.0,
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39 panY_ + static_cast<double>(height_) / 2.0);
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41 // Apply the zoom around (0,0)
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42 cairo_matrix_init_scale(&tmp, zoom_, zoom_);
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43 cairo_matrix_multiply(&transform_, &tmp, &transform_);
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45 // Bring the center of the scene to (0,0)
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46 cairo_matrix_init_translate(&tmp,
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47 -(sceneExtent_.GetX1() + sceneExtent_.GetX2()) / 2.0,
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48 -(sceneExtent_.GetY1() + sceneExtent_.GetY2()) / 2.0);
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49 cairo_matrix_multiply(&transform_, &tmp, &transform_);
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50 }
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53 ViewportGeometry::ViewportGeometry()
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54 {
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55 width_ = 0;
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56 height_ = 0;
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58 zoom_ = 1;
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59 panX_ = 0;
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60 panY_ = 0;
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62 ComputeTransform();
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63 }
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66 void ViewportGeometry::SetDisplaySize(unsigned int width,
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67 unsigned int height)
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68 {
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69 if (width_ != width ||
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70 height_ != height)
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71 {
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72 LOG(INFO) << "New display size: " << width << "x" << height;
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74 width_ = width;
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75 height_ = height;
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77 ComputeTransform();
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78 }
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79 }
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81
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82 void ViewportGeometry::SetSceneExtent(const Extent2D& extent)
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83 {
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84 LOG(INFO) << "New scene extent: ("
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85 << extent.GetX1() << "," << extent.GetY1() << ") => ("
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86 << extent.GetX2() << "," << extent.GetY2() << ")";
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88 sceneExtent_ = extent;
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89 ComputeTransform();
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90 }
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93 void ViewportGeometry::MapDisplayToScene(double& sceneX /* out */,
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94 double& sceneY /* out */,
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95 double x,
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96 double y) const
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97 {
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98 cairo_matrix_t transform = transform_;
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99
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100 if (cairo_matrix_invert(&transform) != CAIRO_STATUS_SUCCESS)
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101 {
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102 LOG(ERROR) << "Cannot invert singular matrix";
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103 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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104 }
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105
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106 sceneX = x;
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107 sceneY = y;
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108 cairo_matrix_transform_point(&transform, &sceneX, &sceneY);
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109 }
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111
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112 void ViewportGeometry::MapSceneToDisplay(int& displayX /* out */,
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113 int& displayY /* out */,
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114 double x,
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115 double y) const
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116 {
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117 cairo_matrix_transform_point(&transform_, &x, &y);
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118
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119 displayX = static_cast<int>(boost::math::iround(x));
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120 displayY = static_cast<int>(boost::math::iround(y));
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121 }
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123
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124 void ViewportGeometry::SetDefaultView()
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125 {
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126 if (width_ > 0 &&
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127 height_ > 0 &&
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128 !sceneExtent_.IsEmpty())
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129 {
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130 double zoomX = static_cast<double>(width_) / (sceneExtent_.GetX2() - sceneExtent_.GetX1());
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131 double zoomY = static_cast<double>(height_) / (sceneExtent_.GetY2() - sceneExtent_.GetY1());
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132 zoom_ = zoomX < zoomY ? zoomX : zoomY;
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133
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134 panX_ = 0;
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135 panY_ = 0;
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136
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137 ComputeTransform();
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138 }
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139 }
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141
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142 void ViewportGeometry::ApplyTransform(CairoContext& context) const
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143 {
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144 cairo_set_matrix(context.GetObject(), &transform_);
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145 }
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146
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147
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148 void ViewportGeometry::GetPan(double& x,
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149 double& y) const
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150 {
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151 x = panX_;
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152 y = panY_;
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153 }
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155
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156 void ViewportGeometry::SetPan(double x,
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157 double y)
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158 {
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159 panX_ = x;
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160 panY_ = y;
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161 ComputeTransform();
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162 }
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163
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164
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165 void ViewportGeometry::SetZoom(double zoom)
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166 {
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167 zoom_ = zoom;
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168 ComputeTransform();
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169 }
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170 }