Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/CairoArrowRenderer.cpp @ 1800:2c0497d61a5d
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 20 May 2021 12:05:15 +0200 |
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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 |
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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 } |