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annotate OrthancStone/Sources/Scene2D/GrayscaleWindowingSceneTracker.cpp @ 1721:d4a8e2b19a65

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new "GrayscaleWindowingChanged" message from GrayscaleWindowingSceneTracker
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 01 Dec 2020 12:51:57 +0100
parents 5cdc5b98f14d
children 9ac2a65d4172
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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 Lesser 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 * Lesser 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 Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "GrayscaleWindowingSceneTracker.h"
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24
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25 #include "../Scene2DViewport/ViewportController.h"
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26 #include "FloatTextureSceneLayer.h"
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27
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28 #include <OrthancException.h>
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29
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30 namespace OrthancStone
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31 {
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32 namespace
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33 {
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34 class GrayscaleLayerAccessor : public boost::noncopyable
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35 {
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36 private:
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37 std::unique_ptr<IViewport::ILock> lock_;
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38 FloatTextureSceneLayer* layer_;
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40 public:
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41 GrayscaleLayerAccessor(boost::weak_ptr<IViewport> viewportWeak,
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42 int layerIndex) :
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43 layer_(NULL)
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44 {
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45 boost::shared_ptr<IViewport> viewport = viewportWeak.lock();
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46 if (viewport != NULL)
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47 {
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48 lock_.reset(viewport->Lock());
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49
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50 if (lock_->GetController().GetScene().HasLayer(layerIndex))
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51 {
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52 ISceneLayer& layer = lock_->GetController().GetScene().GetLayer(layerIndex);
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53 if (layer.GetType() == ISceneLayer::Type_FloatTexture)
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54 {
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55 layer_ = &dynamic_cast<FloatTextureSceneLayer&>(layer);
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56 }
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57 }
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58 }
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59 }
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60
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61 bool IsValid() const
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62 {
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63 return layer_ != NULL;
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64 }
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65
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66 FloatTextureSceneLayer& GetLayer() const
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67 {
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68 if (layer_ == NULL)
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69 {
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70 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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71 }
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72 else
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73 {
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74 return *layer_;
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75 }
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76 }
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77
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78 void Invalidate()
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79 {
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80 if (lock_.get() != NULL)
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81 {
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82 lock_->Invalidate();
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83 }
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84 }
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85
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86 void BroadcastGrayscaleWindowingChanged(double center,
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87 double width)
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88 {
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89 if (lock_.get() != NULL)
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90 {
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91 lock_->GetController().BroadcastGrayscaleWindowingChanged(center, width);
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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
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97 void GrayscaleWindowingSceneTracker::SetWindowing(float center,
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98 float width)
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99 {
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100 if (active_)
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101 {
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102 boost::shared_ptr<IViewport> viewport = viewport_.lock();
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103 GrayscaleLayerAccessor accessor(viewport, layerIndex_);
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104
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105 if (accessor.IsValid())
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106 {
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107 accessor.GetLayer().SetCustomWindowing(center, width);
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108 accessor.BroadcastGrayscaleWindowingChanged(center, width);
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109 accessor.Invalidate();
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110 }
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111 }
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112 }
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113
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114
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115 GrayscaleWindowingSceneTracker::GrayscaleWindowingSceneTracker(boost::weak_ptr<IViewport> viewport,
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116 int layerIndex,
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117 const PointerEvent& event,
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118 unsigned int canvasWidth,
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119 unsigned int canvasHeight) :
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120 OneGesturePointerTracker(viewport),
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121 layerIndex_(layerIndex),
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122 clickX_(event.GetMainPosition().GetX()),
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123 clickY_(event.GetMainPosition().GetY())
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124 {
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125 active_ = false;
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126
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127 if (canvasWidth > 3 &&
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128 canvasHeight > 3)
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129 {
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130 boost::shared_ptr<IViewport> locked = viewport_.lock();
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131
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132 if (locked)
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133 {
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134 GrayscaleLayerAccessor accessor(locked, layerIndex_);
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135
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136 if (accessor.IsValid())
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137 {
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138 FloatTextureSceneLayer& layer = accessor.GetLayer();
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139
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140 layer.GetWindowing(originalCenter_, originalWidth_);
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141
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142 float minValue, maxValue;
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143 layer.GetRange(minValue, maxValue);
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144
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145 normalization_ = (maxValue - minValue) / static_cast<double>(std::min(canvasWidth, canvasHeight) - 1);
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146 active_ = true;
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147 }
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148 else
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149 {
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150 LOG(INFO) << "Cannot create GrayscaleWindowingSceneTracker on a non-float texture";
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151 }
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152 }
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153 }
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154 }
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155
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156 void GrayscaleWindowingSceneTracker::PointerMove(const PointerEvent& event)
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157 {
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158 if (active_)
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159 {
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160 const double x = event.GetMainPosition().GetX();
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161 const double y = event.GetMainPosition().GetY();
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162
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163 float center = originalCenter_ + static_cast<float>((x - clickX_) * normalization_);
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164 float width = originalWidth_ + static_cast<float>((y - clickY_) * normalization_);
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165
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166 if (width <= 1)
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167 {
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168 width = 1;
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169 }
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170
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171 SetWindowing(center, width);
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172 }
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173 }
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174
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175 void GrayscaleWindowingSceneTracker::Cancel()
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176 {
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177 SetWindowing(originalCenter_, originalWidth_);
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178 }
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179 }