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annotate OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 1972:9c0adcc8feec

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refactoring to simplify OneGesturePointerTracker
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 28 Oct 2022 16:21:28 +0200
parents 7053b8a0aaec
children 5a434f5889f8
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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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24 #include "ZoomSceneTracker.h"
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25
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26 #include "../Scene2DViewport/ViewportController.h"
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27 #include "../Viewport/ViewportLocker.h"
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29 namespace OrthancStone
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30 {
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31 ZoomSceneTracker::ZoomSceneTracker(boost::weak_ptr<IViewport> viewport,
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32 const PointerEvent& event,
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33 unsigned int canvasHeight) :
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34 viewport_(viewport),
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35 clickY_(event.GetMainPosition().GetY())
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36 {
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37 ViewportLocker locker(viewport_);
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38
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39 if (locker.IsValid())
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40 {
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41 originalSceneToCanvas_ = locker.GetController().GetSceneToCanvasTransform();
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43 if (canvasHeight > 3)
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44 {
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45 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1);
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46 aligner_.reset(new Internals::FixedPointAligner(locker.GetController(), event.GetMainPosition()));
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47 }
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48 }
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49 }
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50
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51 void ZoomSceneTracker::PointerMove(const PointerEvent& event,
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52 const Scene2D& scene)
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53 {
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54 static const double MIN_ZOOM = -4;
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55 static const double MAX_ZOOM = 4;
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56
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57 if (aligner_.get() != NULL)
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58 {
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59 double y = event.GetMainPosition().GetY();
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61 // In the range [-1,1]
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62 double dy = static_cast<double>(y - clickY_) * normalization_;
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63
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64 double z;
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65
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66 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM]
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67 if (dy < -1.0)
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68 {
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69 z = MIN_ZOOM;
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70 }
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71 else if (dy > 1.0)
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72 {
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73 z = MAX_ZOOM;
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74 }
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75 else
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76 {
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77 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0;
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78 }
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79
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80 double zoom = pow(2.0, z);
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81
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82 ViewportLocker locker(viewport_);
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83
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84 if (locker.IsValid())
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85 {
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86 locker.GetController().SetSceneToCanvasTransform(
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87 AffineTransform2D::Combine(
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88 AffineTransform2D::CreateScaling(zoom, zoom),
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89 originalSceneToCanvas_));
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90 aligner_->Apply(locker.GetController());
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91 locker.Invalidate();
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92 }
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93 }
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94 }
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96 void ZoomSceneTracker::Cancel()
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97 {
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98 ViewportLocker locker(viewport_);
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99
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100 if (locker.IsValid())
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101 {
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102 locker.GetController().SetSceneToCanvasTransform(originalSceneToCanvas_);
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103 locker.Invalidate();
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104 }
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105 }
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106 }