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50
51#include "logo.h"
52#include <qmath.h>
53
54Logo::Logo()
55{
56 m_data.resize(asize: 2500 * 6);
57
58 const GLfloat x1 = +0.06f;
59 const GLfloat y1 = -0.14f;
60 const GLfloat x2 = +0.14f;
61 const GLfloat y2 = -0.06f;
62 const GLfloat x3 = +0.08f;
63 const GLfloat y3 = +0.00f;
64 const GLfloat x4 = +0.30f;
65 const GLfloat y4 = +0.22f;
66
67 quad(x1, y1, x2, y2, x3: y2, y3: x2, x4: y1, y4: x1);
68 quad(x1: x3, y1: y3, x2: x4, y2: y4, x3: y4, y3: x4, x4: y3, y4: x3);
69
70 extrude(x1, y1, x2, y2);
71 extrude(x1: x2, y1: y2, x2: y2, y2: x2);
72 extrude(x1: y2, y1: x2, x2: y1, y2: x1);
73 extrude(x1: y1, y1: x1, x2: x1, y2: y1);
74 extrude(x1: x3, y1: y3, x2: x4, y2: y4);
75 extrude(x1: x4, y1: y4, x2: y4, y2: x4);
76 extrude(x1: y4, y1: x4, x2: y3, y2: x3);
77
78 const int NumSectors = 100;
79
80 for (int i = 0; i < NumSectors; ++i) {
81 GLfloat angle = (i * 2 * M_PI) / NumSectors;
82 GLfloat angleSin = qSin(v: angle);
83 GLfloat angleCos = qCos(v: angle);
84 const GLfloat x5 = 0.30f * angleSin;
85 const GLfloat y5 = 0.30f * angleCos;
86 const GLfloat x6 = 0.20f * angleSin;
87 const GLfloat y6 = 0.20f * angleCos;
88
89 angle = ((i + 1) * 2 * M_PI) / NumSectors;
90 angleSin = qSin(v: angle);
91 angleCos = qCos(v: angle);
92 const GLfloat x7 = 0.20f * angleSin;
93 const GLfloat y7 = 0.20f * angleCos;
94 const GLfloat x8 = 0.30f * angleSin;
95 const GLfloat y8 = 0.30f * angleCos;
96
97 quad(x1: x5, y1: y5, x2: x6, y2: y6, x3: x7, y3: y7, x4: x8, y4: y8);
98
99 extrude(x1: x6, y1: y6, x2: x7, y2: y7);
100 extrude(x1: x8, y1: y8, x2: x5, y2: y5);
101 }
102}
103
104void Logo::add(const QVector3D &v, const QVector3D &n)
105{
106 GLfloat *p = m_data.data() + m_count;
107 *p++ = v.x();
108 *p++ = v.y();
109 *p++ = v.z();
110 *p++ = n.x();
111 *p++ = n.y();
112 *p++ = n.z();
113 m_count += 6;
114}
115
116void Logo::quad(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2, GLfloat x3, GLfloat y3, GLfloat x4, GLfloat y4)
117{
118 QVector3D n = QVector3D::normal(v1: QVector3D(x4 - x1, y4 - y1, 0.0f), v2: QVector3D(x2 - x1, y2 - y1, 0.0f));
119
120 add(v: QVector3D(x1, y1, -0.05f), n);
121 add(v: QVector3D(x4, y4, -0.05f), n);
122 add(v: QVector3D(x2, y2, -0.05f), n);
123
124 add(v: QVector3D(x3, y3, -0.05f), n);
125 add(v: QVector3D(x2, y2, -0.05f), n);
126 add(v: QVector3D(x4, y4, -0.05f), n);
127
128 n = QVector3D::normal(v1: QVector3D(x1 - x4, y1 - y4, 0.0f), v2: QVector3D(x2 - x4, y2 - y4, 0.0f));
129
130 add(v: QVector3D(x4, y4, 0.05f), n);
131 add(v: QVector3D(x1, y1, 0.05f), n);
132 add(v: QVector3D(x2, y2, 0.05f), n);
133
134 add(v: QVector3D(x2, y2, 0.05f), n);
135 add(v: QVector3D(x3, y3, 0.05f), n);
136 add(v: QVector3D(x4, y4, 0.05f), n);
137}
138
139void Logo::extrude(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
140{
141 QVector3D n = QVector3D::normal(v1: QVector3D(0.0f, 0.0f, -0.1f), v2: QVector3D(x2 - x1, y2 - y1, 0.0f));
142
143 add(v: QVector3D(x1, y1, +0.05f), n);
144 add(v: QVector3D(x1, y1, -0.05f), n);
145 add(v: QVector3D(x2, y2, +0.05f), n);
146
147 add(v: QVector3D(x2, y2, -0.05f), n);
148 add(v: QVector3D(x2, y2, +0.05f), n);
149 add(v: QVector3D(x1, y1, -0.05f), n);
150}
151

source code of qtbase/examples/opengl/hellogl2/logo.cpp