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#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