Qwt User's Guide 6.1.5

Static Public Member Functions | List of all members
QwtClipper Class Reference

Some clipping algorithms. More...

`#include <qwt_clipper.h>`

## Static Public Member Functions

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)

## Detailed Description

Some clipping algorithms.

## Member Function Documentation

## ◆ clipCircle()

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

static

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

## ◆ clipPolygon() [1/2]

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

static

Sutherland-Hodgman polygon clipping

Parameters

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

Returns
  Clipped polygon

## ◆ clipPolygon() [2/2]

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

static

Sutherland-Hodgman polygon clipping

Parameters

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

Returns
  Clipped polygon

## ◆ clipPolygonF()

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

static

Sutherland-Hodgman polygon clipping

Parameters

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

Returns
  Clipped polygon