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annotate OrthancStone/Sources/Scene2D/GrayscaleWindowingSceneTracker.cpp @ 1533:82279abb92d0

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GrayscaleWindowingSceneTracker
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 07 Aug 2020 15:55:59 +0200
parents
children 4fb8fdf03314
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1533
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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) 2017-2020 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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20
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21
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22 #include "GrayscaleWindowingSceneTracker.h"
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23
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24 #include "../Scene2DViewport/ViewportController.h"
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25 #include "FloatTextureSceneLayer.h"
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26
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27 #include <OrthancException.h>
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28
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29 namespace OrthancStone
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30 {
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31 namespace
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32 {
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33 class GrayscaleLayerAccessor : public boost::noncopyable
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34 {
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35 private:
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36 std::unique_ptr<IViewport::ILock> lock_;
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37 FloatTextureSceneLayer* layer_;
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38
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39 public:
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40 GrayscaleLayerAccessor(boost::shared_ptr<IViewport> viewport,
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41 int layerIndex) :
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42 layer_(NULL)
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43 {
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44 if (viewport != NULL)
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45 {
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46 lock_.reset(viewport->Lock());
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47
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48 if (lock_->GetController().GetScene().HasLayer(layerIndex))
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49 {
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50 ISceneLayer& layer = lock_->GetController().GetScene().GetLayer(layerIndex);
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51 if (layer.GetType() == ISceneLayer::Type_FloatTexture)
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52 {
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53 layer_ = &dynamic_cast<FloatTextureSceneLayer&>(layer);
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54 }
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55 }
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56 }
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57 }
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58
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59 bool IsValid() const
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60 {
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61 return layer_ != NULL;
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62 }
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63
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64 FloatTextureSceneLayer& GetLayer() const
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65 {
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66 if (layer_ == NULL)
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67 {
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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69 }
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70 else
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71 {
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72 return *layer_;
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73 }
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74 }
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75
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76 void Invalidate()
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77 {
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78 if (lock_.get() != NULL)
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79 {
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80 lock_->Invalidate();
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81 }
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82 }
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83 };
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84 }
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85
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86 void GrayscaleWindowingSceneTracker::SetWindowing(float center,
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87 float width)
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88 {
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89 if (active_)
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90 {
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91 GrayscaleLayerAccessor accessor(viewport_, layerIndex_);
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92
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93 if (accessor.IsValid())
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94 {
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95 accessor.GetLayer().SetCustomWindowing(center, width);
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96 accessor.Invalidate();
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97 }
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98 }
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99 }
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100
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101
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102 GrayscaleWindowingSceneTracker::GrayscaleWindowingSceneTracker(boost::shared_ptr<IViewport> viewport,
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103 int layerIndex,
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104 const PointerEvent& event,
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105 unsigned int canvasWidth,
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106 unsigned int canvasHeight) :
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107 OneGesturePointerTracker(viewport),
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108 layerIndex_(layerIndex),
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109 clickX_(event.GetMainPosition().GetX()),
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110 clickY_(event.GetMainPosition().GetY())
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111 {
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112 active_ = false;
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113
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114 if (canvasWidth > 3 &&
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115 canvasHeight > 3)
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116 {
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117 GrayscaleLayerAccessor accessor(viewport_, layerIndex_);
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118
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119 if (accessor.IsValid())
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120 {
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121 FloatTextureSceneLayer& layer = accessor.GetLayer();
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122
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123 layer.GetWindowing(originalCenter_, originalWidth_);
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124
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125 float minValue, maxValue;
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126 layer.GetRange(minValue, maxValue);
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127
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128 normalization_ = (maxValue - minValue) / static_cast<double>(std::min(canvasWidth, canvasHeight) - 1);
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129 active_ = true;
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130 }
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131 else
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132 {
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133 LOG(INFO) << "Cannot create GrayscaleWindowingSceneTracker on a non-float texture";
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134 }
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135 }
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136 }
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137
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138 void GrayscaleWindowingSceneTracker::PointerMove(const PointerEvent& event)
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139 {
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140 if (active_)
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141 {
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142 const double x = event.GetMainPosition().GetX();
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143 const double y = event.GetMainPosition().GetY();
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144
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145 float center = originalCenter_ + (x - clickX_) * normalization_;
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146 float width = originalWidth_ + (y - clickY_) * normalization_;
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147
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148 if (width <= 1)
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149 {
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150 width = 1;
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151 }
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152
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153 SetWindowing(center, width);
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154 }
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155 }
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156
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157 void GrayscaleWindowingSceneTracker::Cancel()
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158 {
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159 SetWindowing(originalCenter_, originalWidth_);
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160 }
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161 }