Mercurial > hg > orthanc-stone
view Framework/Toolbox/ViewportGeometry.cpp @ 270:2d64f4d39610 am-2
backup (work in progress)
author | am@osimis.io |
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date | Thu, 23 Aug 2018 14:45:04 +0200 |
parents | 5412adf19980 |
children | 7a364e44fbb4 |
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/** * Stone of Orthanc * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2018 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 "ViewportGeometry.h" #include <Core/Logging.h> #include <Core/OrthancException.h> #include <boost/math/special_functions/round.hpp> namespace OrthancStone { void ViewportGeometry::ComputeTransform() { // The following lines must be read in reverse order! cairo_matrix_t tmp; // Bring the center of the scene to the center of the view cairo_matrix_init_translate(&transform_, panX_ + static_cast<double>(width_) / 2.0, panY_ + static_cast<double>(height_) / 2.0); // Apply the zoom around (0,0) cairo_matrix_init_scale(&tmp, zoom_, zoom_); cairo_matrix_multiply(&transform_, &tmp, &transform_); // Bring the center of the scene to (0,0) cairo_matrix_init_translate(&tmp, -(sceneExtent_.GetX1() + sceneExtent_.GetX2()) / 2.0, -(sceneExtent_.GetY1() + sceneExtent_.GetY2()) / 2.0); cairo_matrix_multiply(&transform_, &tmp, &transform_); } ViewportGeometry::ViewportGeometry() { width_ = 0; height_ = 0; zoom_ = 1; panX_ = 0; panY_ = 0; ComputeTransform(); } void ViewportGeometry::SetDisplaySize(unsigned int width, unsigned int height) { if (width_ != width || height_ != height) { LOG(INFO) << "New display size: " << width << "x" << height; width_ = width; height_ = height; ComputeTransform(); } } void ViewportGeometry::SetSceneExtent(const Extent2D& extent) { LOG(INFO) << "New scene extent: (" << extent.GetX1() << "," << extent.GetY1() << ") => (" << extent.GetX2() << "," << extent.GetY2() << ")"; sceneExtent_ = extent; ComputeTransform(); } void ViewportGeometry::MapDisplayToScene(double& sceneX /* out */, double& sceneY /* out */, double x, double y) const { cairo_matrix_t transform = transform_; if (cairo_matrix_invert(&transform) != CAIRO_STATUS_SUCCESS) { LOG(ERROR) << "Cannot invert singular matrix"; throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); } sceneX = x; sceneY = y; cairo_matrix_transform_point(&transform, &sceneX, &sceneY); } void ViewportGeometry::MapSceneToDisplay(int& displayX /* out */, int& displayY /* out */, double x, double y) const { cairo_matrix_transform_point(&transform_, &x, &y); displayX = static_cast<int>(boost::math::iround(x)); displayY = static_cast<int>(boost::math::iround(y)); } void ViewportGeometry::SetDefaultView() { if (width_ > 0 && height_ > 0 && !sceneExtent_.IsEmpty()) { double zoomX = static_cast<double>(width_) / (sceneExtent_.GetX2() - sceneExtent_.GetX1()); double zoomY = static_cast<double>(height_) / (sceneExtent_.GetY2() - sceneExtent_.GetY1()); zoom_ = zoomX < zoomY ? zoomX : zoomY; panX_ = 0; panY_ = 0; ComputeTransform(); } } void ViewportGeometry::ApplyTransform(CairoContext& context) const { cairo_set_matrix(context.GetObject(), &transform_); } void ViewportGeometry::GetPan(double& x, double& y) const { x = panX_; y = panY_; } void ViewportGeometry::SetPan(double x, double y) { panX_ = x; panY_ = y; ComputeTransform(); } void ViewportGeometry::SetZoom(double zoom) { zoom_ = zoom; ComputeTransform(); } }