Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Scene2D/Internals/OpenGLArrowRenderer.cpp @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
parents 9ac2a65d4172
children 7053b8a0aaec
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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 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "OpenGLArrowRenderer.h"
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25
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26 #include <OrthancException.h>
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27
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28 #include <math.h>
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29
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30
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31 namespace OrthancStone
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32 {
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33 namespace Internals
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34 {
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35 void OpenGLArrowRenderer::LoadLayer(const ArrowSceneLayer& layer)
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36 {
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37 // "dataBody_" contains the "body" of the arrow, in scene coordinates
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38 {
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39 PolylineSceneLayer l;
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40 l.SetThickness(layer.GetThickness());
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41
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42 PolylineSceneLayer::Chain chain;
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43 chain.push_back(layer.GetA());
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44 chain.push_back(layer.GetB());
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45 l.AddChain(chain, false, layer.GetColor());
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46
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47 dataBody_.reset(new OpenGLLinesProgram::Data(context_, l));
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48 }
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49
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50 // "dataHead_" contains the "head" of the arrow, properly scaled in
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51 // pixel coordinates, but with center at (0,0)
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52 {
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53 PolylineSceneLayer l;
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54 l.SetThickness(layer.GetThickness());
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55
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56 const double c = cos(layer.GetArrowAngle());
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57 const double s = sin(layer.GetArrowAngle());
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58
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59 PolylineSceneLayer::Chain chain;
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60 chain.push_back(ScenePoint2D(c, s) * layer.GetArrowLength());
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61 chain.push_back(ScenePoint2D(0, 0));
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62 chain.push_back(ScenePoint2D(c, -s) * layer.GetArrowLength());
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63 l.AddChain(chain, false, layer.GetColor());
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64
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65 dataHead_.reset(new OpenGLLinesProgram::Data(context_, l));
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66 }
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67
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68 // Compute a unit vector encoding the direction of the body of the arrow
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69 ScenePoint2D direction = layer.GetB() - layer.GetA();
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70 double n = ScenePoint2D::SquaredMagnitude(direction);
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71 if (LinearAlgebra::IsCloseToZero(n))
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72 {
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73 direction = ScenePoint2D(1, 0);
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74 }
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75 else
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76 {
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77 direction = direction / sqrt(n);
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78 }
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79
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80 // Compute a rotation matrix, to bring the "head" in the axis of the "body"
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81 // https://math.stackexchange.com/a/3565068
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82 Matrix rotation = LinearAlgebra::ZeroMatrix(3, 3);
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83 rotation(0, 0) = direction.GetX();
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84 rotation(1, 0) = direction.GetY();
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85 rotation(0, 1) = -direction.GetY();
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86 rotation(1, 1) = direction.GetX();
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87 rotation(2, 2) = 1;
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88
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89 transformHead_ = AffineTransform2D::Combine(
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90 AffineTransform2D::CreateOffset(layer.GetA().GetX(), layer.GetA().GetY()),
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91 AffineTransform2D(rotation));
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92
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93 if (dataBody_.get() == NULL ||
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94 dataHead_.get() == NULL)
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95 {
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96 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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97 }
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98 }
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99
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100
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101 OpenGLArrowRenderer::OpenGLArrowRenderer(OpenGL::IOpenGLContext& context,
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102 OpenGLLinesProgram& program,
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103 const ArrowSceneLayer& layer) :
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104 context_(context),
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105 program_(program)
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106 {
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107 LoadLayer(layer);
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108 }
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109
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110
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111 void OpenGLArrowRenderer::Render(const AffineTransform2D& transform,
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112 unsigned int canvasWidth,
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113 unsigned int canvasHeight)
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114 {
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115 if (!context_.IsContextLost())
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116 {
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117 program_.Apply(*dataBody_, transform, canvasWidth, canvasHeight, true, true);
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118
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119 const double z = 1.0 / transform.ComputeZoom();
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120 const AffineTransform2D t2 = AffineTransform2D::Combine(
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121 transform, // 3. Apply the original transform
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122 transformHead_, // 2. Bring the "head" of the arrow at the proper position/angle
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123 AffineTransform2D::CreateScaling(z, z)); // 1. Neutralize the zoom level
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124
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125 program_.Apply(*dataHead_, t2, canvasWidth, canvasHeight, true, true);
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126 }
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127 }
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128
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129
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130 void OpenGLArrowRenderer::Update(const ISceneLayer& layer)
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131 {
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132 LoadLayer(dynamic_cast<const ArrowSceneLayer&>(layer));
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133 }
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134 }
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135 }