Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 1808:797633f48a9c
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 20 May 2021 17:28:16 +0200 |
| parents | 9ac2a65d4172 |
| children | 3889ae96d2e9 |
| rev | line source |
|---|---|
| 596 | 1 /** |
| 2 * Stone of Orthanc | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium |
| 596 | 6 * |
| 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 |
| 596 | 9 * as published by the Free Software Foundation, either version 3 of |
| 10 * the License, or (at your option) any later version. | |
| 11 * | |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 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/>. |
| 596 | 20 **/ |
| 21 | |
| 22 | |
| 23 #include "ZoomSceneTracker.h" | |
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24 #include "../Scene2DViewport/ViewportController.h" |
| 596 | 25 |
| 26 namespace OrthancStone | |
| 27 { | |
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28 ZoomSceneTracker::ZoomSceneTracker(boost::weak_ptr<IViewport> viewport, |
| 596 | 29 const PointerEvent& event, |
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30 unsigned int canvasHeight) |
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31 : OneGesturePointerTracker(viewport) |
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32 , clickY_(event.GetMainPosition().GetY()) |
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33 , aligner_(viewport, event.GetMainPosition()) |
| 596 | 34 { |
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35 |
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36 std::unique_ptr<IViewport::ILock> lock(GetViewportLock()); |
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37 originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform(); |
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38 |
| 596 | 39 if (canvasHeight <= 3) |
| 40 { | |
| 41 active_ = false; | |
| 42 } | |
| 43 else | |
| 44 { | |
| 45 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1); | |
| 46 active_ = true; | |
| 47 } | |
| 48 } | |
| 49 | |
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50 void ZoomSceneTracker::PointerMove(const PointerEvent& event) |
| 596 | 51 { |
| 52 static const double MIN_ZOOM = -4; | |
| 53 static const double MAX_ZOOM = 4; | |
| 54 | |
| 55 if (active_) | |
| 56 { | |
| 57 double y = event.GetMainPosition().GetY(); | |
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58 |
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59 // In the range [-1,1] |
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60 double dy = static_cast<double>(y - clickY_) * normalization_; |
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61 |
| 596 | 62 double z; |
| 63 | |
| 64 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM] | |
| 65 if (dy < -1.0) | |
| 66 { | |
| 67 z = MIN_ZOOM; | |
| 68 } | |
| 69 else if (dy > 1.0) | |
| 70 { | |
| 71 z = MAX_ZOOM; | |
| 72 } | |
| 73 else | |
| 74 { | |
| 75 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0; | |
| 76 } | |
| 77 | |
| 78 double zoom = pow(2.0, z); | |
| 79 | |
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80 std::unique_ptr<IViewport::ILock> lock(GetViewportLock()); |
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81 lock->GetController().SetSceneToCanvasTransform( |
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82 AffineTransform2D::Combine( |
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83 AffineTransform2D::CreateScaling(zoom, zoom), |
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84 originalSceneToCanvas_)); |
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85 aligner_.Apply(); |
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86 lock->Invalidate(); |
| 596 | 87 } |
| 88 } | |
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89 |
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90 void ZoomSceneTracker::Cancel() |
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91 { |
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92 std::unique_ptr<IViewport::ILock> lock(GetViewportLock()); |
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93 lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_); |
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94 lock->Invalidate(); |
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95 } |
| 596 | 96 } |