Mercurial > hg > orthanc-stone
comparison OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 1512:244ad1e4e76a
reorganization of folders
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 Jul 2020 16:21:02 +0200 |
parents | Framework/Scene2D/ZoomSceneTracker.cpp@ab81ee8fce1f |
children | 4fb8fdf03314 |
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1511:9dfeee74c1e6 | 1512:244ad1e4e76a |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * Copyright (C) 2017-2020 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" | |
23 #include "../Scene2DViewport/ViewportController.h" | |
24 | |
25 namespace OrthancStone | |
26 { | |
27 ZoomSceneTracker::ZoomSceneTracker(boost::shared_ptr<IViewport> viewport, | |
28 const PointerEvent& event, | |
29 unsigned int canvasHeight) | |
30 : OneGesturePointerTracker(viewport) | |
31 , clickY_(event.GetMainPosition().GetY()) | |
32 , aligner_(viewport, event.GetMainPosition()) | |
33 { | |
34 | |
35 std::unique_ptr<IViewport::ILock> lock(viewport_->Lock()); | |
36 originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform(); | |
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 | |
49 void ZoomSceneTracker::PointerMove(const PointerEvent& event) | |
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(); | |
57 | |
58 // In the range [-1,1] | |
59 double dy = static_cast<double>(y - clickY_) * normalization_; | |
60 | |
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 | |
79 std::unique_ptr<IViewport::ILock> lock(viewport_->Lock()); | |
80 lock->GetController().SetSceneToCanvasTransform( | |
81 AffineTransform2D::Combine( | |
82 AffineTransform2D::CreateScaling(zoom, zoom), | |
83 originalSceneToCanvas_)); | |
84 aligner_.Apply(); | |
85 lock->Invalidate(); | |
86 } | |
87 } | |
88 | |
89 void ZoomSceneTracker::Cancel() | |
90 { | |
91 std::unique_ptr<IViewport::ILock> lock(viewport_->Lock()); | |
92 lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_); | |
93 lock->Invalidate(); | |
94 } | |
95 } |