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annotate OrthancStone/Sources/Scene2DViewport/MeasureTool.h @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
parents 9b650ab68d4c
children 7053b8a0aaec
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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) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23 #pragma once
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24
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25 #include "../Messages/ObserverBase.h"
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26 #include "../Scene2D/PolylineSceneLayer.h"
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27 #include "../Scene2D/Scene2D.h"
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28 #include "../Scene2D/ScenePoint2D.h"
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29 #include "../Scene2D/TextSceneLayer.h"
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30 #include "../Scene2DViewport/PredeclaredTypes.h"
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31 #include "../Scene2DViewport/ViewportController.h"
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32
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33 #include <boost/weak_ptr.hpp>
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34
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35 #include <vector>
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36 #include <cmath>
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37
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38 namespace OrthancStone
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39 {
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40 class IFlexiblePointerTracker;
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41 class MeasureToolMemento;
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42
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43 class MeasureTool : public ObserverBase<MeasureTool>
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44 {
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45 private:
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46 bool enabled_;
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47
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48
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49 protected:
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50 explicit MeasureTool(boost::weak_ptr<IViewport> viewport);
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51
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52 void PostConstructor();
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53
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54 /**
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55 The measuring tool may exist in a standalone fashion, without any available
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56 scene (because the controller is dead or dying). This call allows to check
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57 before accessing the scene.
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58 */
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59 bool IsSceneAlive() const;
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60
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61 /**
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62 This is the meat of the tool: this method must [create (if needed) and]
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63 update the layers and their data according to the measure tool kind and
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64 current state. This is repeatedly called during user interaction
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65 */
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66 virtual void RefreshScene() = 0;
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67
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68 /**
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69 enabled_ is not accessible by subclasses because there is a state machine
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70 that we do not wanna mess with
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71 */
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72 bool IsEnabled() const;
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73
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74 /**
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75 Protected to allow sub-classes to use this weak pointer in factory methods
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76 (pass them to created objects)
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77 */
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78 boost::weak_ptr<IViewport> viewport_;
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79
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80 /**
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81 This will return a scoped lock to the viewport.
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82 If the viewport does not exist anymore, then nullptr is returned.
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83 */
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84 IViewport::ILock* GetViewportLock();
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85 IViewport::ILock* GetViewportLock() const;
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86
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87 public:
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88 virtual ~MeasureTool()
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89 {
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90 }
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91
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92 /**
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93 Enabled tools are rendered in the scene.
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94 */
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95 void Enable();
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96
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97 /**
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98 Disabled tools are not rendered in the scene. This is useful to be able
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99 to use them as their own memento in command stacks (when a measure tool
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100 creation command has been undone, the measure remains alive in the
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101 command object but is disabled so that it can be redone later on easily)
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102 */
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103 void Disable();
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104
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105 /**
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106 This method is called when the scene transform changes. It allows to
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107 recompute the visual elements whose content depend upon the scene transform
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108 */
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109 void OnSceneTransformChanged(
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110 const ViewportController::SceneTransformChanged& message);
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111
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112 /**
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113 This function must be implemented by the measuring tool to return whether
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114 a given point in scene coords is close to the measuring tool.
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115
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116 This is used for mouse hover highlighting.
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117
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118 It is assumed that if the pointer position leads to this function returning
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119 true, then a click at that position will return a tracker to edit the
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120 measuring tool
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121 */
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122 virtual bool HitTest(ScenePoint2D p) = 0;
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123
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124 /**
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125 This method must return a memento the captures the tool state (not including
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126 the highlighting state
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127 */
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128 virtual MeasureToolMemento* CreateMemento() const = 0;
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129
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130 /**
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131 This method must apply the supplied memento (this requires RTTI to check
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132 the type)
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133 */
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134 virtual void SetMemento(const MeasureToolMemento& memento) = 0;
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135
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136 /**
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137 This must create an edition tracker suitable for the supplied click position,
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138 or an empty pointer if no hit test (although this should have been checked
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139 first)
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140 */
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141 virtual boost::shared_ptr<IFlexiblePointerTracker> CreateEditionTracker(const PointerEvent& e) = 0;
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142
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143 /**
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144 Will change the measuring tool to provide visual feedback on the GUI
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145 element that is in the pointer hit zone
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146 */
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147 virtual void Highlight(ScenePoint2D p) = 0;
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148
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149 /**
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150 This function must reset the visual highlighted hot zone feedback
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151 */
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152 virtual void ResetHighlightState() = 0;
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153
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154 /**
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155 A description of the measuring tool, useful in debug logs
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156 */
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157 virtual std::string GetDescription() = 0;
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158 };
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159
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160 class MeasureToolMemento : public boost::noncopyable
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161 {
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162 public:
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163 virtual ~MeasureToolMemento()
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164 {
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165 }
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166 };
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167
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168 }
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169
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170 //extern void TrackerSample_SetInfoDisplayMessage(
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171 // std::string key, std::string value);