Mercurial > hg > orthanc-stone
comparison Framework/Scene2D/ZoomSceneTracker.cpp @ 596:b716763571ad
IPointerTracker
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 26 Apr 2019 17:05:14 +0200 |
parents | |
children | 7efa2543699d |
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595:6e471e6cf09b | 596:b716763571ad |
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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) 2017-2019 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" | |
23 | |
24 namespace OrthancStone | |
25 { | |
26 ZoomSceneTracker::ZoomSceneTracker(Scene2D& scene, | |
27 const PointerEvent& event, | |
28 unsigned int canvasWidth, | |
29 unsigned int canvasHeight) : | |
30 scene_(scene), | |
31 clickY_(event.GetMainPosition().GetY()), | |
32 aligner_(scene, event.GetMainPosition(), canvasWidth, canvasHeight), | |
33 originalSceneToCanvas_(scene.GetSceneToCanvasTransform()) | |
34 { | |
35 if (canvasHeight <= 3) | |
36 { | |
37 active_ = false; | |
38 } | |
39 else | |
40 { | |
41 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1); | |
42 active_ = true; | |
43 } | |
44 } | |
45 | |
46 | |
47 void ZoomSceneTracker::Update(const PointerEvent& event) | |
48 { | |
49 static const double MIN_ZOOM = -4; | |
50 static const double MAX_ZOOM = 4; | |
51 | |
52 if (active_) | |
53 { | |
54 double y = event.GetMainPosition().GetY(); | |
55 double dy = static_cast<double>(y - clickY_) * normalization_; // In the range [-1,1] | |
56 double z; | |
57 | |
58 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM] | |
59 if (dy < -1.0) | |
60 { | |
61 z = MIN_ZOOM; | |
62 } | |
63 else if (dy > 1.0) | |
64 { | |
65 z = MAX_ZOOM; | |
66 } | |
67 else | |
68 { | |
69 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0; | |
70 } | |
71 | |
72 double zoom = pow(2.0, z); | |
73 | |
74 scene_.SetSceneToCanvasTransform( | |
75 AffineTransform2D::Combine( | |
76 AffineTransform2D::CreateScaling(zoom, zoom), | |
77 originalSceneToCanvas_)); | |
78 | |
79 aligner_.Apply(); | |
80 } | |
81 } | |
82 } |