annotate Framework/Scene2D/RotateSceneTracker.cpp @ 958:769249e1f3b4

added guards to prevent calling methods on a dead controller (see comment in diff for expl.) + build fix
author Benjamin Golinvaux <bgo@osimis.io>
date Fri, 23 Aug 2019 10:16:32 +0200
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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 #include "RotateSceneTracker.h"
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22 #include "../Scene2DViewport/ViewportController.h"
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24 namespace OrthancStone
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25 {
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26 RotateSceneTracker::RotateSceneTracker(boost::weak_ptr<ViewportController> controllerW,
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27 const PointerEvent& event)
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28 : OneGesturePointerTracker(controllerW)
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29 , click_(event.GetMainPosition())
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30 , aligner_(controllerW, click_)
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31 , isFirst_(true)
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32 , originalSceneToCanvas_(GetController()->GetSceneToCanvasTransform())
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33 {
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34 }
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35
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36 void RotateSceneTracker::PointerMove(const PointerEvent& event)
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37 {
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38 ScenePoint2D p = event.GetMainPosition();
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39 double dx = p.GetX() - click_.GetX();
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40 double dy = p.GetY() - click_.GetY();
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41
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42 if (std::abs(dx) > 5.0 ||
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43 std::abs(dy) > 5.0)
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44 {
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45 double a = atan2(dy, dx);
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46
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47 if (isFirst_)
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48 {
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49 referenceAngle_ = a;
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50 isFirst_ = false;
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51 }
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52
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53 // The controller is a weak pointer. It could be deleted when the
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54 // tracker is still alive (for instance, because of a lost WebGL
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55 // context that triggers a recreation of the viewport)
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56 if(GetController().get() != NULL)
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57 {
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58 GetController()->SetSceneToCanvasTransform(
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59 AffineTransform2D::Combine(
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60 AffineTransform2D::CreateRotation(a - referenceAngle_),
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61 originalSceneToCanvas_));
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62
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63 aligner_.Apply();
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64 }
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65 }
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66 }
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68 void RotateSceneTracker::Cancel()
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69 {
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70 // See remark above
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71 if(GetController().get() != NULL)
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72 {
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73 GetController()->SetSceneToCanvasTransform(originalSceneToCanvas_);
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74 }
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75 }
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76
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77 }