Mercurial > hg > orthanc-stone
diff OrthancStone/Sources/Scene2D/Internals/CairoArrowRenderer.cpp @ 1614:ad9b425f27ae
new class: ArrowSceneLayer
author | Sebastien Jodogne <s.jodogne@gmail.com> |
---|---|
date | Fri, 30 Oct 2020 16:26:39 +0100 |
parents | |
children | 9ac2a65d4172 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OrthancStone/Sources/Scene2D/Internals/CairoArrowRenderer.cpp Fri Oct 30 16:26:39 2020 +0100 @@ -0,0 +1,77 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2020 Osimis S.A., 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); + } + } + } +}