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comparison OrthancStone/Sources/Scene2D/Internals/OpenGLArrowRenderer.cpp @ 1614:ad9b425f27ae

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new class: ArrowSceneLayer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 30 Oct 2020 16:26:39 +0100
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children 9ac2a65d4172
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1613:5f0660fe06c3 1614:ad9b425f27ae
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 "OpenGLArrowRenderer.h"
24
25 #include <OrthancException.h>
26
27 #include <math.h>
28
29
30 namespace OrthancStone
31 {
32 namespace Internals
33 {
34 void OpenGLArrowRenderer::LoadLayer(const ArrowSceneLayer& layer)
35 {
36 // "dataBody_" contains the "body" of the arrow, in scene coordinates
37 {
38 PolylineSceneLayer l;
39 l.SetThickness(layer.GetThickness());
40
41 PolylineSceneLayer::Chain chain;
42 chain.push_back(layer.GetA());
43 chain.push_back(layer.GetB());
44 l.AddChain(chain, false, layer.GetColor());
45
46 dataBody_.reset(new OpenGLLinesProgram::Data(context_, l));
47 }
48
49 // "dataHead_" contains the "head" of the arrow, properly scaled in
50 // pixel coordinates, but with center at (0,0)
51 {
52 PolylineSceneLayer l;
53 l.SetThickness(layer.GetThickness());
54
55 const double c = cos(layer.GetArrowAngle());
56 const double s = sin(layer.GetArrowAngle());
57
58 PolylineSceneLayer::Chain chain;
59 chain.push_back(ScenePoint2D(c, s) * layer.GetArrowLength());
60 chain.push_back(ScenePoint2D(0, 0));
61 chain.push_back(ScenePoint2D(c, -s) * layer.GetArrowLength());
62 l.AddChain(chain, false, layer.GetColor());
63
64 dataHead_.reset(new OpenGLLinesProgram::Data(context_, l));
65 }
66
67 // Compute a unit vector encoding the direction of the body of the arrow
68 ScenePoint2D direction = layer.GetB() - layer.GetA();
69 double n = ScenePoint2D::SquaredMagnitude(direction);
70 if (LinearAlgebra::IsCloseToZero(n))
71 {
72 direction = ScenePoint2D(1, 0);
73 }
74 else
75 {
76 direction = direction / sqrt(n);
77 }
78
79 // Compute a rotation matrix, to bring the "head" in the axis of the "body"
80 // https://math.stackexchange.com/a/3565068
81 Matrix rotation = LinearAlgebra::ZeroMatrix(3, 3);
82 rotation(0, 0) = direction.GetX();
83 rotation(1, 0) = direction.GetY();
84 rotation(0, 1) = -direction.GetY();
85 rotation(1, 1) = direction.GetX();
86 rotation(2, 2) = 1;
87
88 transformHead_ = AffineTransform2D::Combine(
89 AffineTransform2D::CreateOffset(layer.GetA().GetX(), layer.GetA().GetY()),
90 AffineTransform2D(rotation));
91
92 if (dataBody_.get() == NULL ||
93 dataHead_.get() == NULL)
94 {
95 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
96 }
97 }
98
99
100 OpenGLArrowRenderer::OpenGLArrowRenderer(OpenGL::IOpenGLContext& context,
101 OpenGLLinesProgram& program,
102 const ArrowSceneLayer& layer) :
103 context_(context),
104 program_(program)
105 {
106 LoadLayer(layer);
107 }
108
109
110 void OpenGLArrowRenderer::Render(const AffineTransform2D& transform,
111 unsigned int canvasWidth,
112 unsigned int canvasHeight)
113 {
114 if (!context_.IsContextLost())
115 {
116 program_.Apply(*dataBody_, transform, canvasWidth, canvasHeight, true, true);
117
118 const double z = 1.0 / transform.ComputeZoom();
119 const AffineTransform2D t2 = AffineTransform2D::Combine(
120 transform, // 3. Apply the original transform
121 transformHead_, // 2. Bring the "head" of the arrow at the proper position/angle
122 AffineTransform2D::CreateScaling(z, z)); // 1. Neutralize the zoom level
123
124 program_.Apply(*dataHead_, t2, canvasWidth, canvasHeight, true, true);
125 }
126 }
127
128
129 void OpenGLArrowRenderer::Update(const ISceneLayer& layer)
130 {
131 LoadLayer(dynamic_cast<const ArrowSceneLayer&>(layer));
132 }
133 }
134 }