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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "q3pointarray.h"
#include "private/qbezier_p.h"
#include "private/qpainterpath_p.h"
QT_BEGIN_NAMESPACE
/*!
\class Q3PointArray
The Q3PointArray class provides an array of points.
\compat
Q3PointArray is a QPolygon subclass that provides functions
to make it more source compatible with the \c QPointArray class
in Qt 3.
In Qt 4, we recommend that you use QPainterPath for representing
arcs, ellipses, and Bezier curves, rather than QPolygon.
*/
/*!
Sets the points of the array to those describing an arc of an
ellipse with size, width \a w by height \a h, and position (\a x,
\a y), starting from angle \a a1 and spanning by angle \a a2. The
resulting array has sufficient resolution for pixel accuracy (see
the overloaded function which takes an additional QMatrix
parameter).
Angles are specified in 16ths of a degree, i.e. a full circle
equals 5760 (16*360). Positive values mean counter-clockwise,
whereas negative values mean the clockwise direction. Zero degrees
is at the 3 o'clock position.
*/
#ifndef QT_NO_WMATRIX
void Q3PointArray::makeArc(int x, int y, int w, int h, int a1, int a2)
{
QRectF r(x, y, w, h);
QPointF startPoint;
qt_find_ellipse_coords(r, a1 / 16.0, a2 / 16.0, &startPoint, 0);
QPainterPath path(startPoint);
path.arcTo(r, a1 / 16.0, a2 / 16.0);
if (path.isEmpty())
*this = Q3PointArray();
else
*this = path.toSubpathPolygons().at(0).toPolygon();
}
#endif
#ifndef QT_NO_TRANSFORMATIONS
/*!
\overload
Sets the points of the array to those describing an arc of an
ellipse with width \a w and height \a h and position (\a x, \a y),
starting from angle \a a1, and spanning angle by \a a2, and
transformed by the matrix \a xf. The resulting array has
sufficient resolution for pixel accuracy.
Angles are specified in 16ths of a degree, i.e. a full circle
equals 5760 (16 * 360). Positive values mean counter-clockwise,
whereas negative values mean the clockwise direction. Zero
degrees is at the 3 o'clock position.
*/
void Q3PointArray::makeArc(int x, int y, int w, int h, int a1, int a2, const QMatrix &xf)
{
QRectF r(x, y, w, h);
QPointF startPoint;
qt_find_ellipse_coords(r, a1 / 16.0, a2 / 16.0, &startPoint, 0);
QPainterPath path(startPoint);
path.arcTo(r, a1 / 16.0, a2 / 16.0);
path = path * xf;
if (path.isEmpty())
*this = Q3PointArray();
else
*this = path.toSubpathPolygons().at(0).toPolygon();
}
#endif // QT_NO_TRANSFORMATIONS
/*!
\fn Q3PointArray::Q3PointArray()
Constructs an empty Q3PointArray.
*/
/*!
\fn Q3PointArray::Q3PointArray(const QRect &r, bool closed)
Constructs a point array from the rectangle \a r.
If \a closed is false, then the point array just contains the
following four points of the rectangle ordered clockwise. The
bottom-right point is located at (r.x() + r.width(), r.y() +
r.height()).
*/
/*!
\fn Q3PointArray::Q3PointArray(const QPolygon& other)
Constructs a copy of \a other.
*/
/*!
\fn Q3PointArray Q3PointArray::copy() const
Returns a copy of this Q3PointArray.
*/
/*!
\fn bool Q3PointArray::isNull()
Returns isEmpty(). Use isEmpty() instead.
*/
/*!
Sets the points of the array to those describing an ellipse with
size, width \a w by height \a h, and position (\a x, \a y).
The returned array has sufficient resolution for use as pixels.
*/
void Q3PointArray::makeEllipse(int x, int y, int w, int h)
{
QPainterPath path;
path.addEllipse(x, y, w, h);
*this = path.toSubpathPolygons().at(0).toPolygon();
}
#ifndef QT_NO_BEZIER
/*!
Returns the Bezier points for the four control points in this
array.
*/
Q3PointArray Q3PointArray::cubicBezier() const
{
if (size() != 4) {
qWarning( "Q3PointArray::bezier: The array must have 4 control points" );
return QPolygon();
}
QPolygonF polygon = QBezier::fromPoints(at(0), at(1), at(2), at(3)).toPolygon();
return polygon.toPolygon();
}
#endif //QT_NO_BEZIER
QT_END_NAMESPACE
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