Mercurial > hg > orthanc-stone
diff Framework/Scene2D/ZoomSceneTracker.cpp @ 596:b716763571ad
IPointerTracker
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 26 Apr 2019 17:05:14 +0200 |
parents | |
children | 7efa2543699d |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Framework/Scene2D/ZoomSceneTracker.cpp Fri Apr 26 17:05:14 2019 +0200 @@ -0,0 +1,82 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2019 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero General Public License + * as published by the Free Software Foundation, either version 3 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "ZoomSceneTracker.h" + +namespace OrthancStone +{ + ZoomSceneTracker::ZoomSceneTracker(Scene2D& scene, + const PointerEvent& event, + unsigned int canvasWidth, + unsigned int canvasHeight) : + scene_(scene), + clickY_(event.GetMainPosition().GetY()), + aligner_(scene, event.GetMainPosition(), canvasWidth, canvasHeight), + originalSceneToCanvas_(scene.GetSceneToCanvasTransform()) + { + if (canvasHeight <= 3) + { + active_ = false; + } + else + { + normalization_ = 1.0 / static_cast<double>(canvasHeight - 1); + active_ = true; + } + } + + + void ZoomSceneTracker::Update(const PointerEvent& event) + { + static const double MIN_ZOOM = -4; + static const double MAX_ZOOM = 4; + + if (active_) + { + double y = event.GetMainPosition().GetY(); + double dy = static_cast<double>(y - clickY_) * normalization_; // In the range [-1,1] + double z; + + // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM] + if (dy < -1.0) + { + z = MIN_ZOOM; + } + else if (dy > 1.0) + { + z = MAX_ZOOM; + } + else + { + z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0; + } + + double zoom = pow(2.0, z); + + scene_.SetSceneToCanvasTransform( + AffineTransform2D::Combine( + AffineTransform2D::CreateScaling(zoom, zoom), + originalSceneToCanvas_)); + + aligner_.Apply(); + } + } +}