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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qvector2darray.h"
#include <QtGui/qmatrix4x4.h>
QT_BEGIN_NAMESPACE
/*!
\class QVector2DArray
\brief The QVector2DArray class is a convenience for wrapping a QArray of QVector2D values.
\since 4.8
\ingroup qt3d
\ingroup qt3d::arrays
QVector2DArray is used to build an array of 2D vector values
based on floating-point x and y arguments:
\code
QVector2DArray array;
array.append(1.0f, 2.0f);
array.append(-1.0f, 2.0f);
array.append(1.0f, -2.0f);
\endcode
This is more convenient and readable than the equivalent with
QArray:
\code
QArray<QVector2D> array;
array.append(QVector2D(1.0f, 2.0f));
array.append(QVector2D(-1.0f, 2.0f));
array.append(QVector2D(1.0f, -2.0f));
\endcode
QVector2DArray also has convenience functions for transforming
the contents of the array with translate(), translated(),
transform(), and transformed().
\sa QArray, QVector3DArray, QVector4DArray
*/
/*!
\fn QVector2DArray::QVector2DArray()
Constructs an empty array of QVector2D values.
*/
/*!
\fn QVector2DArray::QVector2DArray(int size, const QVector2D& value)
Constructs an array of QVector2D values with an initial \a size.
All elements in the array are initialized to \a value.
*/
/*!
\fn QVector2DArray::QVector2DArray(const QArray<QVector2D>& other)
Constructs a copy of \a other.
*/
/*!
\fn void QVector2DArray::append(qreal x, qreal y)
\overload
Appends (\a x, \a y) to this array of QVector2D values.
*/
/*!
\fn void QVector2DArray::append(const QPointF& point)
\overload
Appends \a point to this array of QVector2D values.
*/
/*!
\fn void QVector2DArray::append(const QPoint& point);
\overload
Appends \a point to this array of QVector2D values.
*/
/*!
Multiplies the elements in this array of QVector2D values by
the \a scale.
\sa scaled()
*/
void QVector2DArray::scale(qreal scale)
{
if (isDetached()) {
// Modify the array in-place.
int size = count();
QVector2D *dst = data();
for (int index = 0; index < size; ++index)
*dst++ *= scale;
} else {
// Create a new array, translate the values, and assign.
QArray<QVector2D> result;
int size = count();
const QVector2D *src = constData();
QVector2D *dst = result.extend(size);
for (int index = 0; index < size; ++index)
*dst++ = *src++ * scale;
*this = result;
}
}
/*!
Returns a copy of this array of QVector2D values, multiplied
by the \a scale.
\sa scale()
*/
QVector2DArray QVector2DArray::scaled(qreal scale) const
{
const qreal identity = 1.0;
if (qFuzzyCompare(scale, identity))
return *this;
QArray<QVector2D> result;
int size = count();
const QVector2D *src = constData();
QVector2D *dst = result.extend(size);
for (int index = 0; index < size; ++index)
*dst++ = *src++ * scale;
return result;
}
/*!
Translates the elements in this array of QVector2D values
by the components of \a value.
\sa translated()
*/
void QVector2DArray::translate(const QVector2D& value)
{
if (isDetached()) {
// Modify the array in-place.
int size = count();
QVector2D *dst = data();
for (int index = 0; index < size; ++index)
*dst++ += value;
} else {
// Create a new array, translate the values, and assign.
QArray<QVector2D> result;
int size = count();
const QVector2D *src = constData();
QVector2D *dst = result.extend(size);
for (int index = 0; index < size; ++index)
*dst++ = *src++ + value;
*this = result;
}
}
/*!
\fn void QVector2DArray::translate(qreal x, qreal y)
\overload
Translates the elements in this array of QVector2D values
by (\a x, \a y).
\sa translated()
*/
/*!
Returns a copy of this array of QVector2D values, translated
by the components of \a value.
\sa translate()
*/
QArray<QVector2D> QVector2DArray::translated(const QVector2D& value) const
{
QArray<QVector2D> result;
int size = count();
QVector2D *dst = result.extend(size);
const QVector2D *src = constData();
for (int index = 0; index < size; ++index)
*dst++ = *src++ + value;
return result;
}
/*!
\fn QArray<QVector2D> QVector2DArray::translated(qreal x, qreal y) const
\overload
Returns a copy of this array of QVector2D values, translated
by (\a x, \a y).
\sa translate()
*/
/*!
Transforms the elements in this array of QVector2D values
by \a matrix.
\sa transformed()
*/
void QVector2DArray::transform(const QMatrix4x4& matrix)
{
if (isDetached()) {
// Modify the array in-place.
int size = count();
QVector2D *dst = data();
for (int index = 0; index < size; ++index) {
*dst = (matrix * QVector3D(*dst, 0.0f)).toVector2D();
++dst;
}
} else {
// Create a new array, transform the values, and assign.
QArray<QVector2D> result;
int size = count();
const QVector2D *src = constData();
QVector2D *dst = result.extend(size);
for (int index = 0; index < size; ++index)
*dst++ = (matrix * QVector3D(*src++, 0.0f)).toVector2D();
*this = result;
}
}
/*!
Returns a copy of this array of QVector2D values,
transformed by \a matrix.
\sa transform()
*/
QArray<QVector2D> QVector2DArray::transformed(const QMatrix4x4& matrix) const
{
QArray<QVector2D> result;
int size = count();
const QVector2D *src = constData();
QVector2D *dst = result.extend(size);
for (int index = 0; index < size; ++index)
*dst++ = (matrix * QVector3D(*src++, 0.0f)).toVector2D();
return result;
}
QT_END_NAMESPACE
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