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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 #include "ViewportGeometry.h"
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34
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16
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35 #include "../../Resources/Orthanc/Core/Logging.h"
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36 #include "../../Resources/Orthanc/Core/OrthancException.h"
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0
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37
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38 #include <boost/math/special_functions/round.hpp>
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39
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40 namespace OrthancStone
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41 {
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42 void ViewportGeometry::ComputeTransform()
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43 {
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44 // The following lines must be read in reverse order!
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45 cairo_matrix_t tmp;
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46
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47 // Bring the center of the scene to the center of the view
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48 cairo_matrix_init_translate(&transform_,
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49 panX_ + static_cast<double>(width_) / 2.0,
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50 panY_ + static_cast<double>(height_) / 2.0);
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51
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52 // Apply the zoom around (0,0)
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53 cairo_matrix_init_scale(&tmp, zoom_, zoom_);
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54 cairo_matrix_multiply(&transform_, &tmp, &transform_);
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55
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56 // Bring the center of the scene to (0,0)
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57 cairo_matrix_init_translate(&tmp, -(x1_ + x2_) / 2.0, -(y1_ + y2_) / 2.0);
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58 cairo_matrix_multiply(&transform_, &tmp, &transform_);
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59 }
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60
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61
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62 ViewportGeometry::ViewportGeometry()
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63 {
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64 x1_ = 0;
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65 y1_ = 0;
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66 x2_ = 0;
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67 y2_ = 0;
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68
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69 width_ = 0;
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70 height_ = 0;
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71
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72 zoom_ = 1;
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73 panX_ = 0;
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74 panY_ = 0;
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75
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76 ComputeTransform();
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77 }
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78
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79
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80 void ViewportGeometry::SetDisplaySize(unsigned int width,
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81 unsigned int height)
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82 {
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83 if (width_ != width ||
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84 height_ != height)
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85 {
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86 LOG(INFO) << "New display size: " << width << "x" << height;
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87
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88 width_ = width;
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89 height_ = height;
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90
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91 ComputeTransform();
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92 }
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93 }
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94
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95
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96 void ViewportGeometry::SetSceneExtent(double x1,
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97 double y1,
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98 double x2,
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99 double y2)
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100 {
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101 if (x1 == x1_ &&
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102 y1 == y1_ &&
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103 x2 == x2_ &&
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104 y2 == y2_)
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105 {
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106 return;
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107 }
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108 else if (x1 > x2 ||
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109 y1 > y2)
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110 {
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111 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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112 }
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113 else
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114 {
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115 LOG(INFO) << "New scene extent: (" << x1 << "," << y1 << ") => (" << x2 << "," << y2 << ")";
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116
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117 x1_ = x1;
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118 y1_ = y1;
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119 x2_ = x2;
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120 y2_ = y2;
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121
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122 ComputeTransform();
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123 }
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124 }
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125
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126
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127 void ViewportGeometry::GetSceneExtent(double& x1,
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128 double& y1,
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129 double& x2,
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130 double& y2) const
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131 {
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132 x1 = x1_;
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133 y1 = y1_;
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134 x2 = x2_;
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135 y2 = y2_;
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136 }
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137
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138
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139 void ViewportGeometry::MapDisplayToScene(double& sceneX /* out */,
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140 double& sceneY /* out */,
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141 double x,
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142 double y) const
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143 {
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144 cairo_matrix_t transform = transform_;
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145
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146 if (cairo_matrix_invert(&transform) != CAIRO_STATUS_SUCCESS)
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147 {
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148 LOG(ERROR) << "Cannot invert singular matrix";
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149 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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150 }
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151
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152 sceneX = x;
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153 sceneY = y;
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154 cairo_matrix_transform_point(&transform, &sceneX, &sceneY);
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155 }
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156
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157
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158 void ViewportGeometry::MapSceneToDisplay(int& displayX /* out */,
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159 int& displayY /* out */,
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160 double x,
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161 double y) const
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162 {
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163 cairo_matrix_transform_point(&transform_, &x, &y);
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164
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165 displayX = static_cast<int>(boost::math::iround(x));
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166 displayY = static_cast<int>(boost::math::iround(y));
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167 }
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168
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169
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170 void ViewportGeometry::SetDefaultView()
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171 {
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172 if (width_ > 0 &&
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173 height_ > 0 &&
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174 x2_ > x1_ + 10 * std::numeric_limits<double>::epsilon() &&
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175 y2_ > y1_ + 10 * std::numeric_limits<double>::epsilon())
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176 {
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177 double zoomX = static_cast<double>(width_) / (x2_ - x1_);
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178 double zoomY = static_cast<double>(height_) / (y2_ - y1_);
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179 zoom_ = zoomX < zoomY ? zoomX : zoomY;
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180
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181 panX_ = 0;
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182 panY_ = 0;
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183
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184 ComputeTransform();
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185 }
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186 }
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187
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188
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189 void ViewportGeometry::ApplyTransform(CairoContext& context) const
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190 {
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191 cairo_set_matrix(context.GetObject(), &transform_);
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192 }
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193
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194
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195 void ViewportGeometry::GetPan(double& x,
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196 double& y) const
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197 {
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198 x = panX_;
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199 y = panY_;
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200 }
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201
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202
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203 void ViewportGeometry::SetPan(double x,
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204 double y)
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205 {
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206 panX_ = x;
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207 panY_ = y;
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208 ComputeTransform();
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209 }
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210
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211
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212 void ViewportGeometry::SetZoom(double zoom)
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213 {
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214 zoom_ = zoom;
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215 ComputeTransform();
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216 }
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217 }
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