Mercurial > hg > orthanc-stone
comparison OrthancStone/Sources/Scene2D/Internals/CairoArrowRenderer.cpp @ 1614:ad9b425f27ae
new class: ArrowSceneLayer
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 30 Oct 2020 16:26:39 +0100 |
parents | |
children | 9ac2a65d4172 |
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1613:5f0660fe06c3 | 1614:ad9b425f27ae |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * Copyright (C) 2017-2020 Osimis S.A., Belgium | |
6 * | |
7 * This program is free software: you can redistribute it and/or | |
8 * modify it under the terms of the GNU Lesser General Public License | |
9 * as published by the Free Software Foundation, either version 3 of | |
10 * the License, or (at your option) any later version. | |
11 * | |
12 * This program is distributed in the hope that it will be useful, but | |
13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 * Lesser General Public License for more details. | |
16 * | |
17 * You should have received a copy of the GNU Lesser General Public | |
18 * License along with this program. If not, see | |
19 * <http://www.gnu.org/licenses/>. | |
20 **/ | |
21 | |
22 | |
23 #include "CairoArrowRenderer.h" | |
24 | |
25 #include "../ArrowSceneLayer.h" | |
26 | |
27 namespace OrthancStone | |
28 { | |
29 namespace Internals | |
30 { | |
31 void CairoArrowRenderer::Render(const AffineTransform2D& transform, | |
32 unsigned int canvasWidth, | |
33 unsigned int canvasHeight) | |
34 { | |
35 const ArrowSceneLayer& layer = GetLayer<ArrowSceneLayer>(); | |
36 | |
37 cairo_t* cr = GetCairoContext(); | |
38 | |
39 cairo_set_line_width(cr, layer.GetThickness()); | |
40 | |
41 const Color& color = layer.GetColor(); | |
42 cairo_set_source_rgb(cr, color.GetRedAsFloat(), | |
43 color.GetGreenAsFloat(), | |
44 color.GetBlueAsFloat()); | |
45 | |
46 const double zoom = transform.ComputeZoom(); | |
47 | |
48 ScenePoint2D axis = layer.GetB() - layer.GetA(); | |
49 double n = ScenePoint2D::SquaredMagnitude(axis); | |
50 | |
51 if (!LinearAlgebra::IsCloseToZero(n)) | |
52 { | |
53 axis = axis * layer.GetArrowLength() / (sqrt(n) * zoom); | |
54 | |
55 const ScenePoint2D a = layer.GetA().Apply(transform); | |
56 const ScenePoint2D b = layer.GetB().Apply(transform); | |
57 | |
58 cairo_move_to(cr, a.GetX(), a.GetY()); | |
59 cairo_line_to(cr, b.GetX(), b.GetY()); | |
60 | |
61 AffineTransform2D r1 = AffineTransform2D::CreateRotation(layer.GetArrowAngle()); | |
62 const ScenePoint2D c = (layer.GetA() + axis.Apply(r1)).Apply(transform); | |
63 | |
64 AffineTransform2D r2 = AffineTransform2D::CreateRotation(-layer.GetArrowAngle()); | |
65 const ScenePoint2D d = (layer.GetA() + axis.Apply(r2)).Apply(transform); | |
66 | |
67 cairo_move_to(cr, a.GetX(), a.GetY()); | |
68 cairo_line_to(cr, c.GetX(), c.GetY()); | |
69 | |
70 cairo_move_to(cr, a.GetX(), a.GetY()); | |
71 cairo_line_to(cr, d.GetX(), d.GetY()); | |
72 | |
73 cairo_stroke(cr); | |
74 } | |
75 } | |
76 } | |
77 } |