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annotate OrthancStone/Sources/Scene2DViewport/MeasureTool.h @ 1789:462d7a0e064e

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added line measures to sdl single frame viewer sample
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 17 May 2021 11:55:21 +0200
parents 9ac2a65d4172
children 9b650ab68d4c
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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 *
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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 #pragma once
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23
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24 #include "../Messages/ObserverBase.h"
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25 #include "../Scene2D/PolylineSceneLayer.h"
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26 #include "../Scene2D/Scene2D.h"
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27 #include "../Scene2D/ScenePoint2D.h"
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28 #include "../Scene2D/TextSceneLayer.h"
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29 #include "../Scene2DViewport/PredeclaredTypes.h"
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30 #include "../Scene2DViewport/ViewportController.h"
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31
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32 #include <boost/weak_ptr.hpp>
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33
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34 #include <vector>
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35 #include <cmath>
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36
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37 namespace OrthancStone
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38 {
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39 class IFlexiblePointerTracker;
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40 class MeasureToolMemento;
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41
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42 class MeasureTool : public ObserverBase<MeasureTool>
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43 {
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44 private:
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45 bool enabled_;
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46
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47
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48 protected:
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49 explicit MeasureTool(boost::weak_ptr<IViewport> viewport);
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50
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51 void PostConstructor();
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52
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53 /**
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54 The measuring tool may exist in a standalone fashion, without any available
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55 scene (because the controller is dead or dying). This call allows to check
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56 before accessing the scene.
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57 */
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58 bool IsSceneAlive() const;
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59
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60 /**
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61 This is the meat of the tool: this method must [create (if needed) and]
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62 update the layers and their data according to the measure tool kind and
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63 current state. This is repeatedly called during user interaction
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64 */
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65 virtual void RefreshScene() = 0;
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66
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67 /**
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68 enabled_ is not accessible by subclasses because there is a state machine
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69 that we do not wanna mess with
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70 */
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71 bool IsEnabled() const;
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72
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73 /**
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74 Protected to allow sub-classes to use this weak pointer in factory methods
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75 (pass them to created objects)
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76 */
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77 boost::weak_ptr<IViewport> viewport_;
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78
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79 /**
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80 This will return a scoped lock to the viewport.
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81 If the viewport does not exist anymore, then nullptr is returned.
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82 */
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83 IViewport::ILock* GetViewportLock();
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84 IViewport::ILock* GetViewportLock() const;
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85
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86 public:
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87 virtual ~MeasureTool()
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88 {
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89 }
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90
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91 /**
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92 Enabled tools are rendered in the scene.
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93 */
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94 void Enable();
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95
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96 /**
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97 Disabled tools are not rendered in the scene. This is useful to be able
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98 to use them as their own memento in command stacks (when a measure tool
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99 creation command has been undone, the measure remains alive in the
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100 command object but is disabled so that it can be redone later on easily)
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101 */
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102 void Disable();
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103
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104 /**
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105 This method is called when the scene transform changes. It allows to
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106 recompute the visual elements whose content depend upon the scene transform
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107 */
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108 void OnSceneTransformChanged(
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109 const ViewportController::SceneTransformChanged& message);
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110
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111 /**
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112 This function must be implemented by the measuring tool to return whether
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113 a given point in scene coords is close to the measuring tool.
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114
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115 This is used for mouse hover highlighting.
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116
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117 It is assumed that if the pointer position leads to this function returning
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118 true, then a click at that position will return a tracker to edit the
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119 measuring tool
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120 */
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121 virtual bool HitTest(ScenePoint2D p) = 0;
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122
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123 /**
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124 This method must return a memento the captures the tool state (not including
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125 the highlighting state
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126 */
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127 virtual boost::shared_ptr<MeasureToolMemento> GetMemento() const = 0;
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128
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129 /**
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130 This method must apply the supplied memento (this requires RTTI to check
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131 the type)
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132 */
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133 virtual void SetMemento(boost::shared_ptr<MeasureToolMemento>) = 0;
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134
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135 /**
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136 This must create an edition tracker suitable for the supplied click position,
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137 or an empty pointer if no hit test (although this should have been checked
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138 first)
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139 */
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140 virtual boost::shared_ptr<IFlexiblePointerTracker> CreateEditionTracker(const PointerEvent& e) = 0;
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141
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142 /**
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143 Will change the measuring tool to provide visual feedback on the GUI
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144 element that is in the pointer hit zone
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145 */
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146 virtual void Highlight(ScenePoint2D p) = 0;
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147
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148 /**
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149 This function must reset the visual highlighted hot zone feedback
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150 */
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151 virtual void ResetHighlightState() = 0;
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152
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153 /**
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154 A description of the measuring tool, useful in debug logs
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155 */
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156 virtual std::string GetDescription() = 0;
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157 };
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158
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159 class MeasureToolMemento : public boost::noncopyable
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160 {
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161 public:
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162 virtual ~MeasureToolMemento()
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163 {
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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 //extern void TrackerSample_SetInfoDisplayMessage(
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170 // std::string key, std::string value);