annotate Framework/Scene2D/ZoomSceneTracker.cpp @ 1213:86a8266b8888 broker

moving the scene from IViewport to ViewportController
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 04 Dec 2019 17:54:10 +0100
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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22 #include "ZoomSceneTracker.h"
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23 #include "../Scene2DViewport/ViewportController.h"
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25 using boost::weak_ptr;
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26 using boost::shared_ptr;
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27
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28 namespace OrthancStone
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29 {
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30 ZoomSceneTracker::ZoomSceneTracker(weak_ptr<ViewportController> controllerW,
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31 const PointerEvent& event,
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32 unsigned int canvasHeight)
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33 : OneGesturePointerTracker(controllerW)
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34 , clickY_(event.GetMainPosition().GetY())
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35 , aligner_(controllerW, event.GetMainPosition())
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36 , originalSceneToCanvas_(GetController()->GetSceneToCanvasTransform())
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37 {
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38 if (canvasHeight <= 3)
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39 {
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40 active_ = false;
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41 }
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42 else
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43 {
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44 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1);
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45 active_ = true;
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46 }
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47 }
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48
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49 void ZoomSceneTracker::PointerMove(const PointerEvent& event)
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50 {
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51 static const double MIN_ZOOM = -4;
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52 static const double MAX_ZOOM = 4;
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53
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54 if (active_)
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55 {
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56 double y = event.GetMainPosition().GetY();
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58 // In the range [-1,1]
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59 double dy = static_cast<double>(y - clickY_) * normalization_;
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60
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61 double z;
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62
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63 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM]
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64 if (dy < -1.0)
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65 {
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66 z = MIN_ZOOM;
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67 }
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68 else if (dy > 1.0)
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69 {
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70 z = MAX_ZOOM;
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71 }
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72 else
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73 {
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74 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0;
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75 }
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77 double zoom = pow(2.0, z);
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78
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79 // The controller is a weak pointer. It could be deleted when the
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80 // tracker is still alive (for instance, because of a lost WebGL
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81 // context)
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82 if(GetController().get() != NULL)
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83 {
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84 GetController()->SetSceneToCanvasTransform(
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85 AffineTransform2D::Combine(
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86 AffineTransform2D::CreateScaling(zoom, zoom),
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87 originalSceneToCanvas_));
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88
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89 aligner_.Apply();
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90 }
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91 }
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92 }
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94 void ZoomSceneTracker::Cancel()
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95 {
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96 if(GetController().get() != NULL)
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97 {
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98 GetController()->SetSceneToCanvasTransform(originalSceneToCanvas_);
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99 }
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100 }
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101 }