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comparison OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 1512:244ad1e4e76a

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reorganization of folders
author Sebastien Jodogne <s.jodogne@gmail.com>
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
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 }