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view OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 2006:862c572021de
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 02 Nov 2022 17:10:04 +0100 |
parents | 5a434f5889f8 |
children | 07964689cb0b |
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/** * Stone of Orthanc * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2022 Osimis S.A., Belgium * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/>. **/ #include "ZoomSceneTracker.h" #include "../Scene2DViewport/ViewportController.h" #include "../Viewport/ViewportLocker.h" namespace OrthancStone { ZoomSceneTracker::ZoomSceneTracker(boost::weak_ptr<IViewport> viewport, const PointerEvent& event, unsigned int canvasHeight) : viewport_(viewport), clickY_(event.GetMainPosition().GetY()) { ViewportLocker locker(viewport_); if (locker.IsValid()) { originalSceneToCanvas_ = locker.GetController().GetSceneToCanvasTransform(); if (canvasHeight > 3) { normalization_ = 1.0 / static_cast<double>(canvasHeight - 1); aligner_.reset(new Internals::FixedPointAligner(locker.GetController(), event.GetMainPosition())); } } } void ZoomSceneTracker::PointerMove(const PointerEvent& event, const Scene2D& scene) { static const double MIN_ZOOM = -4; static const double MAX_ZOOM = 4; if (aligner_.get() != NULL) { double y = event.GetMainPosition().GetY(); // In the range [-1,1] double dy = static_cast<double>(y - clickY_) * normalization_; 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); ViewportLocker locker(viewport_); if (locker.IsValid()) { locker.GetController().SetSceneToCanvasTransform( AffineTransform2D::Combine( AffineTransform2D::CreateScaling(zoom, zoom), originalSceneToCanvas_)); aligner_->Apply(locker.GetController()); locker.Invalidate(); } } } void ZoomSceneTracker::Cancel(const Scene2D& scene) { ViewportLocker locker(viewport_); if (locker.IsValid()) { locker.GetController().SetSceneToCanvasTransform(originalSceneToCanvas_); locker.Invalidate(); } } }