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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "logo.h" |
| #include <qmath.h> |
| |
| Logo::Logo() |
| : m_count(0) |
| { |
| m_data.resize(2500 * 6); |
| |
| const GLfloat x1 = +0.06f; |
| const GLfloat y1 = -0.14f; |
| const GLfloat x2 = +0.14f; |
| const GLfloat y2 = -0.06f; |
| const GLfloat x3 = +0.08f; |
| const GLfloat y3 = +0.00f; |
| const GLfloat x4 = +0.30f; |
| const GLfloat y4 = +0.22f; |
| |
| quad(x1, y1, x2, y2, y2, x2, y1, x1); |
| quad(x3, y3, x4, y4, y4, x4, y3, x3); |
| |
| extrude(x1, y1, x2, y2); |
| extrude(x2, y2, y2, x2); |
| extrude(y2, x2, y1, x1); |
| extrude(y1, x1, x1, y1); |
| extrude(x3, y3, x4, y4); |
| extrude(x4, y4, y4, x4); |
| extrude(y4, x4, y3, x3); |
| |
| const int NumSectors = 100; |
| |
| for (int i = 0; i < NumSectors; ++i) { |
| GLfloat angle = (i * 2 * M_PI) / NumSectors; |
| GLfloat angleSin = qSin(angle); |
| GLfloat angleCos = qCos(angle); |
| const GLfloat x5 = 0.30f * angleSin; |
| const GLfloat y5 = 0.30f * angleCos; |
| const GLfloat x6 = 0.20f * angleSin; |
| const GLfloat y6 = 0.20f * angleCos; |
| |
| angle = ((i + 1) * 2 * M_PI) / NumSectors; |
| angleSin = qSin(angle); |
| angleCos = qCos(angle); |
| const GLfloat x7 = 0.20f * angleSin; |
| const GLfloat y7 = 0.20f * angleCos; |
| const GLfloat x8 = 0.30f * angleSin; |
| const GLfloat y8 = 0.30f * angleCos; |
| |
| quad(x5, y5, x6, y6, x7, y7, x8, y8); |
| |
| extrude(x6, y6, x7, y7); |
| extrude(x8, y8, x5, y5); |
| } |
| } |
| |
| void Logo::add(const QVector3D &v, const QVector3D &n) |
| { |
| GLfloat *p = m_data.data() + m_count; |
| *p++ = v.x(); |
| *p++ = v.y(); |
| *p++ = v.z(); |
| *p++ = n.x(); |
| *p++ = n.y(); |
| *p++ = n.z(); |
| m_count += 6; |
| } |
| |
| void Logo::quad(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2, GLfloat x3, GLfloat y3, GLfloat x4, GLfloat y4) |
| { |
| QVector3D n = QVector3D::normal(QVector3D(x4 - x1, y4 - y1, 0.0f), QVector3D(x2 - x1, y2 - y1, 0.0f)); |
| |
| add(QVector3D(x1, y1, -0.05f), n); |
| add(QVector3D(x4, y4, -0.05f), n); |
| add(QVector3D(x2, y2, -0.05f), n); |
| |
| add(QVector3D(x3, y3, -0.05f), n); |
| add(QVector3D(x2, y2, -0.05f), n); |
| add(QVector3D(x4, y4, -0.05f), n); |
| |
| n = QVector3D::normal(QVector3D(x1 - x4, y1 - y4, 0.0f), QVector3D(x2 - x4, y2 - y4, 0.0f)); |
| |
| add(QVector3D(x4, y4, 0.05f), n); |
| add(QVector3D(x1, y1, 0.05f), n); |
| add(QVector3D(x2, y2, 0.05f), n); |
| |
| add(QVector3D(x2, y2, 0.05f), n); |
| add(QVector3D(x3, y3, 0.05f), n); |
| add(QVector3D(x4, y4, 0.05f), n); |
| } |
| |
| void Logo::extrude(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2) |
| { |
| QVector3D n = QVector3D::normal(QVector3D(0.0f, 0.0f, -0.1f), QVector3D(x2 - x1, y2 - y1, 0.0f)); |
| |
| add(QVector3D(x1, y1, +0.05f), n); |
| add(QVector3D(x1, y1, -0.05f), n); |
| add(QVector3D(x2, y2, +0.05f), n); |
| |
| add(QVector3D(x2, y2, -0.05f), n); |
| add(QVector3D(x2, y2, +0.05f), n); |
| add(QVector3D(x1, y1, -0.05f), n); |
| } |