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comparison Framework/Widgets/ZoomMouseTracker.cpp @ 332:50e5ec1bdd46 am-2

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separating ZoomMouseTracker and PanMouseTracker from WorldSceneWidget
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 17 Oct 2018 19:38:39 +0200
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children 99e31898910e
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331:7ccf919faff0 332:50e5ec1bdd46
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 }