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annotate Framework/Widgets/ZoomMouseTracker.cpp @ 585:b9ce24c606ae

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TextSceneLayer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 19 Apr 2019 17:57:58 +0200
parents 3b4df9925db6
children 4f2416d519b4
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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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b70e9be013e4 preparing for 2019
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5 * Copyright (C) 2017-2019 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 "ZoomMouseTracker.h"
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23
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24 #include <Core/Logging.h>
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25 #include <Core/OrthancException.h>
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26
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27 namespace OrthancStone
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28 {
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29 ZoomMouseTracker::ZoomMouseTracker(WorldSceneWidget& that,
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30 int x,
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31 int y) :
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32 that_(that),
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33 originalZoom_(that.GetView().GetZoom()),
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34 downX_(x),
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35 downY_(y)
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36 {
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37 that.GetView().MapPixelCenterToScene(centerX_, centerY_, x, y);
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38
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39 unsigned int height = that.GetView().GetDisplayHeight();
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40
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41 if (height <= 3)
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42 {
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43 idle_ = true;
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44 LOG(WARNING) << "image is too small to zoom (current height = " << height << ")";
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45 }
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46 else
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47 {
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48 idle_ = false;
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49 normalization_ = 1.0 / static_cast<double>(height - 1);
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50 }
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51 }
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52
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53
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54 void ZoomMouseTracker::Render(CairoContext& context,
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55 double zoom)
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56 {
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57 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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58 }
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59
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60
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61 void ZoomMouseTracker::MouseMove(int displayX,
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62 int displayY,
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63 double x,
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64 double y,
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65 const std::vector<Touch>& displayTouches,
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66 const std::vector<Touch>& sceneTouches)
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67 {
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68 static const double MIN_ZOOM = -4;
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69 static const double MAX_ZOOM = 4;
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70
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71
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72 if (!idle_)
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73 {
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74 double dy = static_cast<double>(displayY - downY_) * normalization_; // In the range [-1,1]
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75 double z;
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76
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77 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM]
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78 if (dy < -1.0)
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79 {
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80 z = MIN_ZOOM;
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81 }
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82 else if (dy > 1.0)
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83 {
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84 z = MAX_ZOOM;
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85 }
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86 else
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87 {
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88 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0;
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89 }
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90
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91 z = pow(2.0, z);
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92
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93 ViewportGeometry view = that_.GetView();
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94
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95 view.SetZoom(z * originalZoom_);
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96
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97 // Correct the pan so that the original click point is kept at
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98 // the same location on the display
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99 double panX, panY;
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100 view.GetPan(panX, panY);
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101
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102 int tx, ty;
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103 view.MapSceneToDisplay(tx, ty, centerX_, centerY_);
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104 view.SetPan(panX + static_cast<double>(downX_ - tx),
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105 panY + static_cast<double>(downY_ - ty));
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106
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107 that_.SetView(view);
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108 }
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109 }
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110 }