diff options
author | Mika Salmela <mika.salmela@theqtcompany.com> | 2014-12-04 09:57:20 +0200 |
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committer | Mika Salmela <mika.salmela@theqtcompany.com> | 2014-12-04 09:57:57 +0200 |
commit | deaab27525898386ff9bf655e58810e744b518ee (patch) | |
tree | a8089be6fdd8c5e37f6719bf73510e2a889f0757 /tests/galaxy/star.cpp | |
parent | 9644652e37d13430e318332652288b05866a432f (diff) |
Initial version of Galaxy.
Change-Id: I29898bed342022290c8c8a6c4459969ffba3df56
Reviewed-by: Mika Salmela <mika.salmela@theqtcompany.com>
Diffstat (limited to 'tests/galaxy/star.cpp')
-rw-r--r-- | tests/galaxy/star.cpp | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/tests/galaxy/star.cpp b/tests/galaxy/star.cpp new file mode 100644 index 00000000..dd94698c --- /dev/null +++ b/tests/galaxy/star.cpp @@ -0,0 +1,51 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.io +** +** This file is part of the Qt Data Visualization module. +** +** Licensees holding valid commercial license for Qt may use this file in +** accordance with the Qt License Agreement provided with the Software +** or, alternatively, in accordance with the terms contained in a written +** agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.io +** +****************************************************************************/ + +#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)); +} |