QwtClipper Namespace Reference

Some clipping algorithms. More...

Functions
QWT_EXPORT void	clipPolygon (const QRect &, QPolygon &, bool closePolygon=false)
QWT_EXPORT void	clipPolygon (const QRectF &, QPolygon &, bool closePolygon=false)
QWT_EXPORT void	clipPolygonF (const QRectF &, QPolygonF &, bool closePolygon=false)
QWT_EXPORT QPolygon	clippedPolygon (const QRect &, const QPolygon &, bool closePolygon=false)
QWT_EXPORT QPolygon	clippedPolygon (const QRectF &, const QPolygon &, bool closePolygon=false)
QWT_EXPORT QPolygonF	clippedPolygonF (const QRectF &, const QPolygonF &, bool closePolygon=false)
QWT_EXPORT QVector< QwtInterval >	clipCircle (const QRectF &, const QPointF &, double radius)

Detailed Description

Some clipping algorithms.

Function Documentation

clipCircle()

QVector< QwtInterval > QwtClipper::clipCircle	(	const QRectF &	clipRect,
		const QPointF &	center,
		double	radius )

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

Definition at line 477 of file qwt_clipper.cpp.

clippedPolygon() [1/2]

QPolygon QwtClipper::clippedPolygon	(	const QRect &	clipRect,
		const QPolygon &	polygon,
		bool	closePolygon = false )

Sutherland-Hodgman polygon clipping

Parameters

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

Returns

Clipped polygon

Definition at line 437 of file qwt_clipper.cpp.

clippedPolygon() [2/2]

QPolygon QwtClipper::clippedPolygon	(	const QRectF &	clipRect,
		const QPolygon &	polygon,
		bool	closePolygon = false )

Sutherland-Hodgman polygon clipping

Parameters

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

Returns

Clipped polygon

Definition at line 420 of file qwt_clipper.cpp.

clippedPolygonF()

QPolygonF QwtClipper::clippedPolygonF	(	const QRectF &	clipRect,
		const QPolygonF &	polygon,
		bool	closePolygon = false )

Sutherland-Hodgman polygon clipping

Parameters

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

Returns

Clipped polygon

Definition at line 455 of file qwt_clipper.cpp.

clipPolygon() [1/2]

void QwtClipper::clipPolygon	(	const QRect &	clipRect,
		QPolygon &	polygon,
		bool	closePolygon = false )

Sutherland-Hodgman polygon clipping

Parameters

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

Definition at line 390 of file qwt_clipper.cpp.

clipPolygon() [2/2]

void QwtClipper::clipPolygon	(	const QRectF &	clipRect,
		QPolygon &	polygon,
		bool	closePolygon = false )

Sutherland-Hodgman polygon clipping

Parameters

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

Definition at line 369 of file qwt_clipper.cpp.

clipPolygonF()

void QwtClipper::clipPolygonF	(	const QRectF &	clipRect,
		QPolygonF &	polygon,
		bool	closePolygon = false )

Sutherland-Hodgman polygon clipping

Parameters

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

Definition at line 404 of file qwt_clipper.cpp.