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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 "PanSceneTracker.h"
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23
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24 namespace OrthancStone
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25 {
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26 PanSceneTracker::PanSceneTracker(Scene2D& scene,
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27 const PointerEvent& event) :
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28 scene_(scene),
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29 originalSceneToCanvas_(scene_.GetSceneToCanvasTransform()),
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30 originalCanvasToScene_(scene_.GetCanvasToSceneTransform())
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31 {
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32 pivot_ = event.GetMainPosition().Apply(originalCanvasToScene_);
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33 }
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34
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35
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36 void PanSceneTracker::Update(const PointerEvent& event)
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37 {
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38 ScenePoint2D p = event.GetMainPosition().Apply(originalCanvasToScene_);
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39
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40 scene_.SetSceneToCanvasTransform(
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41 AffineTransform2D::Combine(
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42 originalSceneToCanvas_,
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43 AffineTransform2D::CreateOffset(p.GetX() - pivot_.GetX(),
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44 p.GetY() - pivot_.GetY())));
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45 }
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46 }
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