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Diffstat (limited to 'tests/manual/galaxy/star.cpp')
-rw-r--r-- | tests/manual/galaxy/star.cpp | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/tests/manual/galaxy/star.cpp b/tests/manual/galaxy/star.cpp new file mode 100644 index 00000000..3a7db28a --- /dev/null +++ b/tests/manual/galaxy/star.cpp @@ -0,0 +1,54 @@ +/****************************************************************************** +** +** Copyright (C) 2015 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the Qt Data Visualization module. +** +** $QT_BEGIN_LICENSE:COMM$ +** +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. +** +** $QT_END_LICENSE$ +** +******************************************************************************/ + +#include "star.h" + +#include <QtCore/qmath.h> + +static const double DEG_TO_RAD = M_PI / 180.0; + +Star::Star() + : m_theta(0), + m_a(0), + m_b(0), + m_center(QVector2D(0.0f, 0.0f)) +{ +} + +const void Star::calcXY() +{ + qreal &a = m_a; + qreal &b = m_b; + qreal &theta = m_theta; + const QVector2D &p = m_center; + + qreal beta = -m_angle; + qreal alpha = theta * DEG_TO_RAD; + + // temporaries to save cpu time + qreal cosalpha = qCos(alpha); + qreal sinalpha = qSin(alpha); + qreal cosbeta = qCos(beta); + qreal sinbeta = qSin(beta); + + m_pos = QVector2D(p.x() + (a * cosalpha * cosbeta - b * sinalpha * sinbeta), + p.y() + (a * cosalpha * sinbeta + b * sinalpha * cosbeta)); +} |