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annotate OrthancStone/Sources/Scene2D/Internals/OpenGLArrowRenderer.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 "OpenGLArrowRenderer.h"
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24
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25 #include <OrthancException.h>
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26
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27 #include <math.h>
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28
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29
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30 namespace OrthancStone
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31 {
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32 namespace Internals
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33 {
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34 void OpenGLArrowRenderer::LoadLayer(const ArrowSceneLayer& layer)
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35 {
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36 // "dataBody_" contains the "body" of the arrow, in scene coordinates
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37 {
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38 PolylineSceneLayer l;
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39 l.SetThickness(layer.GetThickness());
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40
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41 PolylineSceneLayer::Chain chain;
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42 chain.push_back(layer.GetA());
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43 chain.push_back(layer.GetB());
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44 l.AddChain(chain, false, layer.GetColor());
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45
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46 dataBody_.reset(new OpenGLLinesProgram::Data(context_, l));
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47 }
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48
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49 // "dataHead_" contains the "head" of the arrow, properly scaled in
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50 // pixel coordinates, but with center at (0,0)
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51 {
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52 PolylineSceneLayer l;
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53 l.SetThickness(layer.GetThickness());
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54
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55 const double c = cos(layer.GetArrowAngle());
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56 const double s = sin(layer.GetArrowAngle());
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57
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58 PolylineSceneLayer::Chain chain;
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59 chain.push_back(ScenePoint2D(c, s) * layer.GetArrowLength());
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60 chain.push_back(ScenePoint2D(0, 0));
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61 chain.push_back(ScenePoint2D(c, -s) * layer.GetArrowLength());
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62 l.AddChain(chain, false, layer.GetColor());
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63
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64 dataHead_.reset(new OpenGLLinesProgram::Data(context_, l));
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65 }
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66
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67 // Compute a unit vector encoding the direction of the body of the arrow
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68 ScenePoint2D direction = layer.GetB() - layer.GetA();
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69 double n = ScenePoint2D::SquaredMagnitude(direction);
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70 if (LinearAlgebra::IsCloseToZero(n))
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71 {
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72 direction = ScenePoint2D(1, 0);
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73 }
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74 else
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75 {
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76 direction = direction / sqrt(n);
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77 }
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78
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79 // Compute a rotation matrix, to bring the "head" in the axis of the "body"
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80 // https://math.stackexchange.com/a/3565068
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81 Matrix rotation = LinearAlgebra::ZeroMatrix(3, 3);
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82 rotation(0, 0) = direction.GetX();
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83 rotation(1, 0) = direction.GetY();
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84 rotation(0, 1) = -direction.GetY();
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85 rotation(1, 1) = direction.GetX();
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86 rotation(2, 2) = 1;
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87
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88 transformHead_ = AffineTransform2D::Combine(
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89 AffineTransform2D::CreateOffset(layer.GetA().GetX(), layer.GetA().GetY()),
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90 AffineTransform2D(rotation));
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91
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92 if (dataBody_.get() == NULL ||
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93 dataHead_.get() == NULL)
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94 {
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95 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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96 }
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97 }
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98
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99
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100 OpenGLArrowRenderer::OpenGLArrowRenderer(OpenGL::IOpenGLContext& context,
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101 OpenGLLinesProgram& program,
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102 const ArrowSceneLayer& layer) :
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103 context_(context),
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104 program_(program)
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105 {
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106 LoadLayer(layer);
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107 }
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108
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109
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110 void OpenGLArrowRenderer::Render(const AffineTransform2D& transform,
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111 unsigned int canvasWidth,
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112 unsigned int canvasHeight)
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113 {
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114 if (!context_.IsContextLost())
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115 {
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116 program_.Apply(*dataBody_, transform, canvasWidth, canvasHeight, true, true);
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117
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118 const double z = 1.0 / transform.ComputeZoom();
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119 const AffineTransform2D t2 = AffineTransform2D::Combine(
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120 transform, // 3. Apply the original transform
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121 transformHead_, // 2. Bring the "head" of the arrow at the proper position/angle
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122 AffineTransform2D::CreateScaling(z, z)); // 1. Neutralize the zoom level
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123
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124 program_.Apply(*dataHead_, t2, canvasWidth, canvasHeight, true, true);
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125 }
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126 }
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127
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128
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129 void OpenGLArrowRenderer::Update(const ISceneLayer& layer)
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130 {
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131 LoadLayer(dynamic_cast<const ArrowSceneLayer&>(layer));
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132 }
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133 }
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134 }