Mercurial > hg > orthanc-stone
view OrthancStone/Sources/Scene2D/Internals/CairoArrowRenderer.cpp @ 1886:ca89fec8c48f
test
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 14 Jan 2022 19:10:30 +0100 |
parents | 7053b8a0aaec |
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 "CairoArrowRenderer.h" #include "../ArrowSceneLayer.h" namespace OrthancStone { namespace Internals { void CairoArrowRenderer::Render(const AffineTransform2D& transform, unsigned int canvasWidth, unsigned int canvasHeight) { const ArrowSceneLayer& layer = GetLayer<ArrowSceneLayer>(); cairo_t* cr = GetCairoContext(); cairo_set_line_width(cr, layer.GetThickness()); const Color& color = layer.GetColor(); cairo_set_source_rgb(cr, color.GetRedAsFloat(), color.GetGreenAsFloat(), color.GetBlueAsFloat()); const double zoom = transform.ComputeZoom(); ScenePoint2D axis = layer.GetB() - layer.GetA(); double n = ScenePoint2D::SquaredMagnitude(axis); if (!LinearAlgebra::IsCloseToZero(n)) { axis = axis * layer.GetArrowLength() / (sqrt(n) * zoom); const ScenePoint2D a = layer.GetA().Apply(transform); const ScenePoint2D b = layer.GetB().Apply(transform); cairo_move_to(cr, a.GetX(), a.GetY()); cairo_line_to(cr, b.GetX(), b.GetY()); AffineTransform2D r1 = AffineTransform2D::CreateRotation(layer.GetArrowAngle()); const ScenePoint2D c = (layer.GetA() + axis.Apply(r1)).Apply(transform); AffineTransform2D r2 = AffineTransform2D::CreateRotation(-layer.GetArrowAngle()); const ScenePoint2D d = (layer.GetA() + axis.Apply(r2)).Apply(transform); cairo_move_to(cr, a.GetX(), a.GetY()); cairo_line_to(cr, c.GetX(), c.GetY()); cairo_move_to(cr, a.GetX(), a.GetY()); cairo_line_to(cr, d.GetX(), d.GetY()); cairo_stroke(cr); } } } }