Logo Search packages:      
Sourcecode: qt4-x11 version File versions  Download package

q3pointarray.cpp

/****************************************************************************
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.1, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "q3pointarray.h"
#include "private/qbezier_p.h"
#include "private/qpainterpath_p.h"

/*!
    \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
00076 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.
*/
00107 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.
*/
00165 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.
*/
00178 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

Generated by  Doxygen 1.6.0   Back to index