Mercurial > hg > orthanc-stone
annotate Framework/Scene2D/ZoomSceneTracker.cpp @ 1039:3a35d8397559
merge
author | Alain Mazy <alain@mazy.be> |
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date | Mon, 07 Oct 2019 22:37:24 +0200 |
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 { |
958
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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 } |