Mercurial > hg > orthanc-stone
view Framework/Deprecated/Widgets/ZoomMouseTracker.cpp @ 886:5cfb479fdbde am-dev
fix BasicScene WASM sample
author | Alain Mazy <alain@mazy.be> |
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date | Tue, 09 Jul 2019 17:36:47 +0200 |
parents | c35e98d22764 |
children | 2d8ab34c8c91 |
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/** * 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 "ZoomMouseTracker.h" #include <Core/Logging.h> #include <Core/OrthancException.h> namespace Deprecated { ZoomMouseTracker::ZoomMouseTracker(WorldSceneWidget& that, int x, int y) : that_(that), originalZoom_(that.GetView().GetZoom()), downX_(x), downY_(y) { that.GetView().MapPixelCenterToScene(centerX_, centerY_, x, y); unsigned int height = that.GetView().GetDisplayHeight(); if (height <= 3) { idle_ = true; LOG(WARNING) << "image is too small to zoom (current height = " << height << ")"; } else { idle_ = false; normalization_ = 1.0 / static_cast<double>(height - 1); } } void ZoomMouseTracker::Render(OrthancStone::CairoContext& context, double zoom) { throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); } void ZoomMouseTracker::MouseMove(int displayX, int displayY, double x, double y, const std::vector<Touch>& displayTouches, const std::vector<Touch>& sceneTouches) { static const double MIN_ZOOM = -4; static const double MAX_ZOOM = 4; if (!idle_) { double dy = static_cast<double>(displayY - downY_) * 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; } z = pow(2.0, z); ViewportGeometry view = that_.GetView(); view.SetZoom(z * originalZoom_); // Correct the pan so that the original click point is kept at // the same location on the display double panX, panY; view.GetPan(panX, panY); int tx, ty; view.MapSceneToDisplay(tx, ty, centerX_, centerY_); view.SetPan(panX + static_cast<double>(downX_ - tx), panY + static_cast<double>(downY_ - ty)); that_.SetView(view); } } }