annotate OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 1914:ebe4fd1ad311

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Sun, 20 Mar 2022 18:01:57 +0100
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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 #include "../Scene2DViewport/ViewportController.h"
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27 namespace OrthancStone
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28 {
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29 ZoomSceneTracker::ZoomSceneTracker(boost::weak_ptr<IViewport> viewport,
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30 const PointerEvent& event,
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31 unsigned int canvasHeight)
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32 : OneGesturePointerTracker(viewport)
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33 , clickY_(event.GetMainPosition().GetY())
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34 , aligner_(viewport, event.GetMainPosition())
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35 {
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36
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37 std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
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38 originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform();
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39
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40 if (canvasHeight <= 3)
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41 {
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42 active_ = false;
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43 }
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44 else
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45 {
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46 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1);
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47 active_ = true;
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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 {
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53 static const double MIN_ZOOM = -4;
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54 static const double MAX_ZOOM = 4;
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56 if (active_)
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57 {
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58 double y = event.GetMainPosition().GetY();
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60 // In the range [-1,1]
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61 double dy = static_cast<double>(y - clickY_) * normalization_;
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62
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63 double z;
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65 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM]
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66 if (dy < -1.0)
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67 {
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68 z = MIN_ZOOM;
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69 }
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70 else if (dy > 1.0)
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71 {
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72 z = MAX_ZOOM;
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73 }
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74 else
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75 {
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76 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0;
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77 }
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78
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79 double zoom = pow(2.0, z);
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80
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81 std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
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82 lock->GetController().SetSceneToCanvasTransform(
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83 AffineTransform2D::Combine(
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84 AffineTransform2D::CreateScaling(zoom, zoom),
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85 originalSceneToCanvas_));
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86 aligner_.Apply();
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87 lock->Invalidate();
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88 }
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89 }
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91 void ZoomSceneTracker::Cancel()
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92 {
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93 std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
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94 lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_);
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95 lock->Invalidate();
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96 }
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97 }