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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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21
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22 #include "ZoomSceneTracker.h"
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23
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24 namespace OrthancStone
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25 {
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26 ZoomSceneTracker::ZoomSceneTracker(Scene2D& scene,
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27 const PointerEvent& event,
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28 unsigned int canvasWidth,
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29 unsigned int canvasHeight) :
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30 scene_(scene),
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31 clickY_(event.GetMainPosition().GetY()),
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32 aligner_(scene, event.GetMainPosition(), canvasWidth, canvasHeight),
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33 originalSceneToCanvas_(scene.GetSceneToCanvasTransform())
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34 {
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35 if (canvasHeight <= 3)
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36 {
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37 active_ = false;
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38 }
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39 else
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40 {
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41 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1);
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42 active_ = true;
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43 }
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44 }
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45
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46
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47 void ZoomSceneTracker::Update(const PointerEvent& event)
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48 {
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49 static const double MIN_ZOOM = -4;
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50 static const double MAX_ZOOM = 4;
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51
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52 if (active_)
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53 {
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54 double y = event.GetMainPosition().GetY();
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55 double dy = static_cast<double>(y - clickY_) * normalization_; // In the range [-1,1]
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56 double z;
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57
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58 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM]
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59 if (dy < -1.0)
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60 {
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61 z = MIN_ZOOM;
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62 }
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63 else if (dy > 1.0)
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64 {
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65 z = MAX_ZOOM;
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66 }
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67 else
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68 {
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69 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0;
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70 }
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71
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72 double zoom = pow(2.0, z);
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73
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74 scene_.SetSceneToCanvasTransform(
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75 AffineTransform2D::Combine(
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76 AffineTransform2D::CreateScaling(zoom, zoom),
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77 originalSceneToCanvas_));
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78
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79 aligner_.Apply();
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80 }
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81 }
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82 }
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