Mercurial > hg > orthanc-stone
comparison Framework/Widgets/ZoomMouseTracker.cpp @ 332:50e5ec1bdd46 am-2
separating ZoomMouseTracker and PanMouseTracker from WorldSceneWidget
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 17 Oct 2018 19:38:39 +0200 |
parents | |
children | 99e31898910e |
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331:7ccf919faff0 | 332:50e5ec1bdd46 |
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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) 2017-2018 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 "ZoomMouseTracker.h" | |
23 | |
24 #include <Core/Logging.h> | |
25 | |
26 namespace OrthancStone | |
27 { | |
28 ZoomMouseTracker::ZoomMouseTracker(WorldSceneWidget& that, | |
29 int x, | |
30 int y) : | |
31 that_(that), | |
32 originalZoom_(that.GetView().GetZoom()), | |
33 downX_(x), | |
34 downY_(y) | |
35 { | |
36 that.GetView().MapPixelCenterToScene(centerX_, centerY_, x, y); | |
37 | |
38 unsigned int height = that.GetView().GetDisplayHeight(); | |
39 | |
40 if (height <= 3) | |
41 { | |
42 idle_ = true; | |
43 LOG(WARNING) << "image is too small to zoom (current height = " << height << ")"; | |
44 } | |
45 else | |
46 { | |
47 idle_ = false; | |
48 normalization_ = 1.0 / static_cast<double>(height - 1); | |
49 } | |
50 } | |
51 | |
52 | |
53 void ZoomMouseTracker::Render(CairoContext& context, | |
54 double zoom) | |
55 { | |
56 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); | |
57 } | |
58 | |
59 | |
60 void ZoomMouseTracker::MouseMove(int displayX, | |
61 int displayY, | |
62 double x, | |
63 double y) | |
64 { | |
65 static const double MIN_ZOOM = -4; | |
66 static const double MAX_ZOOM = 4; | |
67 | |
68 | |
69 if (!idle_) | |
70 { | |
71 double dy = static_cast<double>(displayY - downY_) * normalization_; // In the range [-1,1] | |
72 double z; | |
73 | |
74 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM] | |
75 if (dy < -1.0) | |
76 { | |
77 z = MIN_ZOOM; | |
78 } | |
79 else if (dy > 1.0) | |
80 { | |
81 z = MAX_ZOOM; | |
82 } | |
83 else | |
84 { | |
85 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0; | |
86 } | |
87 | |
88 z = pow(2.0, z); | |
89 | |
90 ViewportGeometry view = that_.GetView(); | |
91 | |
92 view.SetZoom(z * originalZoom_); | |
93 | |
94 // Correct the pan so that the original click point is kept at | |
95 // the same location on the display | |
96 double panX, panY; | |
97 view.GetPan(panX, panY); | |
98 | |
99 int tx, ty; | |
100 view.MapSceneToDisplay(tx, ty, centerX_, centerY_); | |
101 view.SetPan(panX + static_cast<double>(downX_ - tx), | |
102 panY + static_cast<double>(downY_ - ty)); | |
103 | |
104 that_.SetView(view); | |
105 } | |
106 } | |
107 } |