QwtClipper(3) Qwt User's Guide QwtClipper(3)

QwtClipper - Some clipping algorithms.

#include <qwt_clipper.h>


static QPolygon clipPolygon (const QRect &, const QPolygon &, bool closePolygon=false)
static QPolygon clipPolygon (const QRectF &, const QPolygon &, bool closePolygon=false)
static QPolygonF clipPolygonF (const QRectF &, const QPolygonF &, bool closePolygon=false)
static QVector< QwtInterval > clipCircle (const QRectF &, const QPointF &, double radius)

Some clipping algorithms.

Circle clipping

clipCircle() divides a circle into intervals of angles representing arcs of the circle. When the circle is completely inside the clip rectangle an interval [0.0, 2 * M_PI] is returned.

Parameters:

clipRect Clip rectangle
center Center of the circle
radius Radius of the circle

Returns:

Arcs of the circle

Sutherland-Hodgman polygon clipping

Parameters:

clipRect Clip rectangle
polygon Polygon
closePolygon True, when the polygon is closed

Returns:

Clipped polygon

Sutherland-Hodgman polygon clipping

Parameters:

clipRect Clip rectangle
polygon Polygon
closePolygon True, when the polygon is closed

Returns:

Clipped polygon

Sutherland-Hodgman polygon clipping

Parameters:

clipRect Clip rectangle
polygon Polygon
closePolygon True, when the polygon is closed

Returns:

Clipped polygon

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Wed Jan 2 2019 Version 6.1.4