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annotate OrthancStone/Sources/Scene2D/PanSceneTracker.cpp @ 1871:7053b8a0aaec

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:18:48 +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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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24 #include "PanSceneTracker.h"
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25 #include "../Viewport/IViewport.h"
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26 #include "../Scene2DViewport/ViewportController.h"
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28 #include <memory>
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30 namespace OrthancStone
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31 {
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32 PanSceneTracker::PanSceneTracker(boost::weak_ptr<IViewport> viewport,
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33 const PointerEvent& event)
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34 : OneGesturePointerTracker(viewport)
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35 {
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37 std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
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39 originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform();
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40 originalCanvasToScene_ = lock->GetController().GetCanvasToSceneTransform();
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41
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42 pivot_ = event.GetMainPosition().Apply(originalCanvasToScene_);
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43 }
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46 void PanSceneTracker::PointerMove(const PointerEvent& event)
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47 {
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48 ScenePoint2D p = event.GetMainPosition().Apply(originalCanvasToScene_);
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49
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50 std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
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52 lock->GetController().SetSceneToCanvasTransform(
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53 AffineTransform2D::Combine(
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54 originalSceneToCanvas_,
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55 AffineTransform2D::CreateOffset(p.GetX() - pivot_.GetX(),
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56 p.GetY() - pivot_.GetY())));
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57 lock->Invalidate();
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58 }
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60 void PanSceneTracker::Cancel()
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61 {
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62 std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
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63 lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_);
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64 }
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65 }