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annotate OrthancStone/Sources/Scene2DViewport/MeasureTool.h @ 1576:92fca2b3ba3d

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sanitizing the handling of canvas size
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 24 Sep 2020 16:40:30 +0200
parents 85e117739eca
children 8563ea5d8ae4
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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 #pragma once
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22
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23 #include "../Messages/ObserverBase.h"
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24 #include "../Scene2D/PolylineSceneLayer.h"
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25 #include "../Scene2D/Scene2D.h"
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26 #include "../Scene2D/ScenePoint2D.h"
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27 #include "../Scene2D/TextSceneLayer.h"
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28 #include "../Scene2DViewport/PredeclaredTypes.h"
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29 #include "../Scene2DViewport/ViewportController.h"
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30
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31 #include <boost/weak_ptr.hpp>
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32
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33 #include <vector>
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34 #include <cmath>
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35
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36 namespace OrthancStone
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37 {
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38 class IFlexiblePointerTracker;
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39 class MeasureToolMemento;
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40
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41 class MeasureTool : public ObserverBase<MeasureTool>
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42 {
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43 private:
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44 bool enabled_;
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45
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46
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47 protected:
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48 explicit MeasureTool(boost::shared_ptr<IViewport> viewport);
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49
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50 void PostConstructor();
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51
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52 /**
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53 The measuring tool may exist in a standalone fashion, without any available
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54 scene (because the controller is dead or dying). This call allows to check
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55 before accessing the scene.
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56 */
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57 bool IsSceneAlive() const;
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58
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59 /**
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60 This is the meat of the tool: this method must [create (if needed) and]
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61 update the layers and their data according to the measure tool kind and
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62 current state. This is repeatedly called during user interaction
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63 */
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64 virtual void RefreshScene() = 0;
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65
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66 /**
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67 enabled_ is not accessible by subclasses because there is a state machine
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68 that we do not wanna mess with
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69 */
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70 bool IsEnabled() const;
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71
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72 /**
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73 Protected to allow sub-classes to use this weak pointer in factory methods
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74 (pass them to created objects)
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75 */
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76 boost::shared_ptr<IViewport> viewport_;
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78
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79 public:
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80 virtual ~MeasureTool()
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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 Enabled tools are rendered in the scene.
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86 */
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87 void Enable();
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88
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89 /**
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90 Disabled tools are not rendered in the scene. This is useful to be able
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91 to use them as their own memento in command stacks (when a measure tool
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92 creation command has been undone, the measure remains alive in the
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93 command object but is disabled so that it can be redone later on easily)
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94 */
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95 void Disable();
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96
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97 /**
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98 This method is called when the scene transform changes. It allows to
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99 recompute the visual elements whose content depend upon the scene transform
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100 */
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101 void OnSceneTransformChanged(
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102 const ViewportController::SceneTransformChanged& message);
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103
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104 /**
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105 This function must be implemented by the measuring tool to return whether
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106 a given point in scene coords is close to the measuring tool.
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107
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108 This is used for mouse hover highlighting.
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109
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110 It is assumed that if the pointer position leads to this function returning
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111 true, then a click at that position will return a tracker to edit the
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112 measuring tool
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113 */
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114 virtual bool HitTest(ScenePoint2D p) = 0;
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115
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116 /**
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117 This method must return a memento the captures the tool state (not including
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118 the highlighting state
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119 */
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120 virtual boost::shared_ptr<MeasureToolMemento> GetMemento() const = 0;
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121
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122 /**
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123 This method must apply the supplied memento (this requires RTTI to check
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124 the type)
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125 */
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126 virtual void SetMemento(boost::shared_ptr<MeasureToolMemento>) = 0;
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127
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128 /**
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129 This must create an edition tracker suitable for the supplied click position,
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130 or an empty pointer if no hit test (although this should have been checked
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131 first)
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132 */
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133 virtual boost::shared_ptr<IFlexiblePointerTracker> CreateEditionTracker(const PointerEvent& e) = 0;
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134
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135 /**
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136 Will change the measuring tool to provide visual feedback on the GUI
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137 element that is in the pointer hit zone
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138 */
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139 virtual void Highlight(ScenePoint2D p) = 0;
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140
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141 /**
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142 This function must reset the visual highlighted hot zone feedback
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143 */
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144 virtual void ResetHighlightState() = 0;
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145
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146 /**
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147 A description of the measuring tool, useful in debug logs
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148 */
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149 virtual std::string GetDescription() = 0;
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150 };
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151
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152 class MeasureToolMemento
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153 {
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154 public:
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155 virtual ~MeasureToolMemento()
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156 {
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157 }
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158 };
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159
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160 }
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161
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162 //extern void TrackerSample_SetInfoDisplayMessage(
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163 // std::string key, std::string value);