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annotate Framework/Scene2D/PanSceneTracker.cpp @ 1270:2d8ab34c8c91

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 31 Jan 2020 17:34:29 +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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22 #include "PanSceneTracker.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 PanSceneTracker::PanSceneTracker(boost::weak_ptr<ViewportController> controllerW,
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28 const PointerEvent& event)
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29 : OneGesturePointerTracker(controllerW)
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30 , originalSceneToCanvas_(GetController()->GetSceneToCanvasTransform())
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31 , originalCanvasToScene_(GetController()->GetCanvasToSceneTransform())
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32 {
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33 pivot_ = event.GetMainPosition().Apply(originalCanvasToScene_);
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34 }
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36
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37 void PanSceneTracker::PointerMove(const PointerEvent& event)
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38 {
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39 ScenePoint2D p = event.GetMainPosition().Apply(originalCanvasToScene_);
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41 // The controller is a weak pointer. It could be deleted when the
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42 // tracker is still alive (for instance, because of a lost WebGL
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43 // context)
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44 if(GetController().get() != NULL)
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45 {
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46 GetController()->SetSceneToCanvasTransform(
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47 AffineTransform2D::Combine(
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48 originalSceneToCanvas_,
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49 AffineTransform2D::CreateOffset(p.GetX() - pivot_.GetX(),
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50 p.GetY() - pivot_.GetY())));
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51 }
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52 }
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54 void PanSceneTracker::Cancel()
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55 {
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56 if(GetController().get() != NULL)
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57 {
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58 GetController()->SetSceneToCanvasTransform(originalSceneToCanvas_);
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59 }
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60 }
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61
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62 }