Mercurial > hg > orthanc-stone
annotate Framework/Scene2D/ZoomSceneTracker.cpp @ 1213:86a8266b8888 broker
moving the scene from IViewport to ViewportController
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 04 Dec 2019 17:54:10 +0100 |
| parents | 769249e1f3b4 |
| children | 2d8ab34c8c91 |
| rev | line source |
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| 596 | 1 /** |
| 2 * Stone of Orthanc | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
| 5 * Copyright (C) 2017-2019 Osimis S.A., Belgium | |
| 6 * | |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU Affero General Public License | |
| 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 | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 * Affero General Public License for more details. | |
| 16 * | |
| 17 * You should have received a copy of the GNU Affero General Public License | |
| 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 **/ | |
| 20 | |
| 21 | |
| 22 #include "ZoomSceneTracker.h" | |
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23 #include "../Scene2DViewport/ViewportController.h" |
| 596 | 24 |
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25 using boost::weak_ptr; |
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26 using boost::shared_ptr; |
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27 |
| 596 | 28 namespace OrthancStone |
| 29 { | |
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30 ZoomSceneTracker::ZoomSceneTracker(weak_ptr<ViewportController> controllerW, |
| 596 | 31 const PointerEvent& event, |
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32 unsigned int canvasHeight) |
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33 : OneGesturePointerTracker(controllerW) |
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34 , clickY_(event.GetMainPosition().GetY()) |
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35 , aligner_(controllerW, event.GetMainPosition()) |
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36 , originalSceneToCanvas_(GetController()->GetSceneToCanvasTransform()) |
| 596 | 37 { |
| 38 if (canvasHeight <= 3) | |
| 39 { | |
| 40 active_ = false; | |
| 41 } | |
| 42 else | |
| 43 { | |
| 44 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1); | |
| 45 active_ = true; | |
| 46 } | |
| 47 } | |
| 48 | |
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49 void ZoomSceneTracker::PointerMove(const PointerEvent& event) |
| 596 | 50 { |
| 51 static const double MIN_ZOOM = -4; | |
| 52 static const double MAX_ZOOM = 4; | |
| 53 | |
| 54 if (active_) | |
| 55 { | |
| 56 double y = event.GetMainPosition().GetY(); | |
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57 |
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58 // In the range [-1,1] |
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59 double dy = static_cast<double>(y - clickY_) * normalization_; |
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60 |
| 596 | 61 double z; |
| 62 | |
| 63 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM] | |
| 64 if (dy < -1.0) | |
| 65 { | |
| 66 z = MIN_ZOOM; | |
| 67 } | |
| 68 else if (dy > 1.0) | |
| 69 { | |
| 70 z = MAX_ZOOM; | |
| 71 } | |
| 72 else | |
| 73 { | |
| 74 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0; | |
| 75 } | |
| 76 | |
| 77 double zoom = pow(2.0, z); | |
| 78 | |
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79 // The controller is a weak pointer. It could be deleted when the |
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80 // tracker is still alive (for instance, because of a lost WebGL |
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81 // context) |
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82 if(GetController().get() != NULL) |
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83 { |
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84 GetController()->SetSceneToCanvasTransform( |
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85 AffineTransform2D::Combine( |
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86 AffineTransform2D::CreateScaling(zoom, zoom), |
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87 originalSceneToCanvas_)); |
| 596 | 88 |
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89 aligner_.Apply(); |
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90 } |
| 596 | 91 } |
| 92 } | |
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93 |
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94 void ZoomSceneTracker::Cancel() |
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95 { |
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96 if(GetController().get() != NULL) |
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97 { |
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98 GetController()->SetSceneToCanvasTransform(originalSceneToCanvas_); |
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99 } |
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100 } |
| 596 | 101 } |