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annotate OrthancStone/Sources/Scene2D/Internals/CairoArrowRenderer.cpp @ 1739:9ac2a65d4172

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upgrade to year 2021
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 06 Jan 2021 17:50:00 +0100
parents ad9b425f27ae
children 3889ae96d2e9
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
1739
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "CairoArrowRenderer.h"
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24
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25 #include "../ArrowSceneLayer.h"
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26
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27 namespace OrthancStone
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28 {
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29 namespace Internals
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30 {
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31 void CairoArrowRenderer::Render(const AffineTransform2D& transform,
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32 unsigned int canvasWidth,
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33 unsigned int canvasHeight)
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34 {
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35 const ArrowSceneLayer& layer = GetLayer<ArrowSceneLayer>();
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36
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37 cairo_t* cr = GetCairoContext();
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38
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39 cairo_set_line_width(cr, layer.GetThickness());
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40
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41 const Color& color = layer.GetColor();
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42 cairo_set_source_rgb(cr, color.GetRedAsFloat(),
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43 color.GetGreenAsFloat(),
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44 color.GetBlueAsFloat());
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45
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46 const double zoom = transform.ComputeZoom();
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47
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48 ScenePoint2D axis = layer.GetB() - layer.GetA();
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49 double n = ScenePoint2D::SquaredMagnitude(axis);
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50
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51 if (!LinearAlgebra::IsCloseToZero(n))
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52 {
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53 axis = axis * layer.GetArrowLength() / (sqrt(n) * zoom);
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54
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55 const ScenePoint2D a = layer.GetA().Apply(transform);
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56 const ScenePoint2D b = layer.GetB().Apply(transform);
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57
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58 cairo_move_to(cr, a.GetX(), a.GetY());
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59 cairo_line_to(cr, b.GetX(), b.GetY());
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60
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61 AffineTransform2D r1 = AffineTransform2D::CreateRotation(layer.GetArrowAngle());
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62 const ScenePoint2D c = (layer.GetA() + axis.Apply(r1)).Apply(transform);
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63
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64 AffineTransform2D r2 = AffineTransform2D::CreateRotation(-layer.GetArrowAngle());
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65 const ScenePoint2D d = (layer.GetA() + axis.Apply(r2)).Apply(transform);
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66
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67 cairo_move_to(cr, a.GetX(), a.GetY());
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68 cairo_line_to(cr, c.GetX(), c.GetY());
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69
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70 cairo_move_to(cr, a.GetX(), a.GetY());
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71 cairo_line_to(cr, d.GetX(), d.GetY());
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72
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73 cairo_stroke(cr);
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74 }
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75 }
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76 }
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77 }