annotate Framework/Scene2D/ZoomSceneTracker.cpp @ 1310:9bea7e15b519 broker

- first pass at changes to cope with the refactoring of the loading system - global loader-related data accessible through ILoadersContext::ILock - many changes in legacy loaders (CT, RTSTRUCT, DOSE) + loader cache - NOT FINISHED! there are shared_from_this calls in ctors! this will crash!
author Benjamin Golinvaux <bgo@osimis.io>
date Mon, 09 Mar 2020 14:53:22 +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) 2017-2020 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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21
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22 #include "ZoomSceneTracker.h"
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23 #include "../Scene2DViewport/ViewportController.h"
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25 namespace OrthancStone
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26 {
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27 ZoomSceneTracker::ZoomSceneTracker(IViewport& viewport,
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28 const PointerEvent& event,
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29 unsigned int canvasHeight)
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30 : OneGesturePointerTracker(viewport)
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31 , clickY_(event.GetMainPosition().GetY())
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32 , aligner_(viewport, event.GetMainPosition())
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33 {
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35 std::unique_ptr<IViewport::ILock> lock(viewport_.Lock());
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36 originalSceneToCanvas_ = lock->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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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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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 std::unique_ptr<IViewport::ILock> lock(viewport_.Lock());
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80 lock->GetController().SetSceneToCanvasTransform(
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81 AffineTransform2D::Combine(
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82 AffineTransform2D::CreateScaling(zoom, zoom),
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83 originalSceneToCanvas_));
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84 aligner_.Apply();
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85 lock->Invalidate();
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86 }
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87 }
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89 void ZoomSceneTracker::Cancel()
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90 {
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91 std::unique_ptr<IViewport::ILock> lock(viewport_.Lock());
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92 lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_);
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93 lock->Invalidate();
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94 }
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95 }