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50 
51 #include "logo.h"
52 #include <qmath.h>
53 
Logo()54 Logo::Logo()
55 {
56     m_data.resize(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, y2, x2, y1, x1);
68     quad(x3, y3, x4, y4, y4, x4, y3, x3);
69 
70     extrude(x1, y1, x2, y2);
71     extrude(x2, y2, y2, x2);
72     extrude(y2, x2, y1, x1);
73     extrude(y1, x1, x1, y1);
74     extrude(x3, y3, x4, y4);
75     extrude(x4, y4, y4, x4);
76     extrude(y4, x4, y3, 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(angle);
83         GLfloat angleCos = qCos(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(angle);
91         angleCos = qCos(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(x5, y5, x6, y6, x7, y7, x8, y8);
98 
99         extrude(x6, y6, x7, y7);
100         extrude(x8, y8, x5, y5);
101     }
102 }
103 
add(const QVector3D & v,const QVector3D & n)104 void 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 
quad(GLfloat x1,GLfloat y1,GLfloat x2,GLfloat y2,GLfloat x3,GLfloat y3,GLfloat x4,GLfloat y4)116 void Logo::quad(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2, GLfloat x3, GLfloat y3, GLfloat x4, GLfloat y4)
117 {
118     QVector3D n = QVector3D::normal(QVector3D(x4 - x1, y4 - y1, 0.0f), QVector3D(x2 - x1, y2 - y1, 0.0f));
119 
120     add(QVector3D(x1, y1, -0.05f), n);
121     add(QVector3D(x4, y4, -0.05f), n);
122     add(QVector3D(x2, y2, -0.05f), n);
123 
124     add(QVector3D(x3, y3, -0.05f), n);
125     add(QVector3D(x2, y2, -0.05f), n);
126     add(QVector3D(x4, y4, -0.05f), n);
127 
128     n = QVector3D::normal(QVector3D(x1 - x4, y1 - y4, 0.0f), QVector3D(x2 - x4, y2 - y4, 0.0f));
129 
130     add(QVector3D(x4, y4, 0.05f), n);
131     add(QVector3D(x1, y1, 0.05f), n);
132     add(QVector3D(x2, y2, 0.05f), n);
133 
134     add(QVector3D(x2, y2, 0.05f), n);
135     add(QVector3D(x3, y3, 0.05f), n);
136     add(QVector3D(x4, y4, 0.05f), n);
137 }
138 
extrude(GLfloat x1,GLfloat y1,GLfloat x2,GLfloat y2)139 void Logo::extrude(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
140 {
141     QVector3D n = QVector3D::normal(QVector3D(0.0f, 0.0f, -0.1f), QVector3D(x2 - x1, y2 - y1, 0.0f));
142 
143     add(QVector3D(x1, y1, +0.05f), n);
144     add(QVector3D(x1, y1, -0.05f), n);
145     add(QVector3D(x2, y2, +0.05f), n);
146 
147     add(QVector3D(x2, y2, -0.05f), n);
148     add(QVector3D(x2, y2, +0.05f), n);
149     add(QVector3D(x1, y1, -0.05f), n);
150 }
151