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QPolygonF Class Reference

^{[ QtGui module]}

The QPolygonF class provides a vector of points using floating point precision. 更多...

方法

• __init__ ( self )
• __init__ ( self , QPolygonF  a )
• __init__ ( self , list-of-QPointF  v )
• __init__ ( self , QRectF  r )
• __init__ ( self , QPolygon  a )
• __init__ ( self , int  asize )
• append ( self , QPointF  value )
• QPointF at ( self , int  i )
• QRectF boundingRect ( self )
• clear ( self )
• bool contains ( self , QPointF  value )
• bool containsPoint ( self , QPointF  pt , Qt.FillRule  fillRule )
• int count ( self , QPointF  value )
• int count ( self )
• sip.voidptr data ( self )
• fill ( self , QPointF  value , int  size  = -1)
• QPointF first ( self )
• int indexOf ( self , QPointF  value , int  from  = 0)
• insert ( self , int  i , QPointF  value )
• QPolygonF intersected ( self , QPolygonF  r )
• bool isClosed ( self )
• bool isEmpty ( self )
• QPointF last ( self )
• int lastIndexOf ( self , QPointF  value , int  from  = -1)
• QPolygonF mid ( self , int  pos , int  length  = -1)
• prepend ( self , QPointF  value )
• remove ( self , int  i )
• remove ( self , int  i , int  count )
• replace ( self , int  i , QPointF  value )
• int size ( self )
• QPolygonF subtracted ( self , QPolygonF  r )
• swap ( self , QPolygonF  other )
• QPolygon toPolygon ( self )
• translate ( self , QPointF  offset )
• translate ( self , float  dx , float  dy )
• QPolygonF translated ( self , QPointF  offset )
• QPolygonF translated ( self , float  dx , float  dy )
• QPolygonF united ( self , QPolygonF  r )
• QPointF value ( self , int  i )
• QPointF value ( self , int  i , QPointF  defaultValue )

Special Methods

• QPolygonF __add__ ( self , QPolygonF  other )
• int __contains__ ( self , QPointF  value )
• __delitem__ ( self , int  i )
• __delitem__ ( self , slice  slice )
• bool __eq__ ( self , QPolygonF  other )
• QPointF __getitem__ ( self , int  i )
• QPolygonF __getitem__ ( self , slice  slice )
• QPolygonF __iadd__ ( self , QPolygonF  other )
• QPolygonF __iadd__ ( self , QPointF  value )
• __len__ ( self )
• object __lshift__ ( self , QPointF  value )
• QPolygonF __mul__ ( self , QMatrix  m )
• QPolygonF __mul__ ( self , QTransform  m )
• bool __ne__ ( self , QPolygonF  other )
• __setitem__ ( self , int  i , QPointF  value )
• __setitem__ ( self , slice  slice , QPolygonF  list )

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详细描述

The QPolygonF class provides a vector of points using floating point precision.

A QPolygonF is a QVector < QPointF >. The easiest way to add points to a QPolygonF is to use its streaming operator, as illustrated below:

         QPolygonF polygon;
         polygon << QPointF(10.4, 20.5) << QPointF(20.2, 30.2);
			

In addition to the functions provided by QVector , QPolygonF provides the boundingRect () 和 translate () functions for geometry operations. Use the QMatrix.map () function for more general transformations of QPolygonFs.

QPolygonF also provides the isClosed () function to determine whether a polygon's start and end points are the same, and the toPolygon () function returning an integer precision copy of this polygon.

The QPolygonF class is implicitly shared .

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方法文档编制

QPolygonF.__init__ ( self )

Constructs a polygon with no points.

另请参阅 QVector.isEmpty ().

QPolygonF.__init__ ( self , QPolygonF   a )

Constructs a polygon of the given size . Creates an empty polygon if size == 0.

另请参阅 QVector.isEmpty ().

QPolygonF.__init__ ( self , list-of-QPointF  v )

构造副本为给定 polygon .

QPolygonF.__init__ ( self , QRectF   r )

Constructs a polygon containing the specified points .

QPolygonF.__init__ ( self , QPolygon   a )

Constructs a closed polygon from the specified rectangle .

The polygon contains the four vertices of the rectangle in clockwise order starting and ending with the top-left vertex.

另请参阅 isClosed ().

QPolygonF.__init__ ( self , int  asize )

Constructs a float based polygon from the specified integer based polygon .

另请参阅 toPolygon ().

QPolygonF.append ( self , QPointF   value )

QPointF QPolygonF.at ( self , int  i )

QRectF QPolygonF.boundingRect ( self )

Returns the bounding rectangle of the polygon, or QRectF (0,0,0,0) if the polygon is empty.

另请参阅 QVector.isEmpty ().

QPolygonF.clear ( self )

bool QPolygonF.contains ( self , QPointF   value )

bool QPolygonF.containsPoint ( self , QPointF   pt , Qt.FillRule   fillRule )

Returns true if the given point is inside the polygon according to the specified fillRule ；否则返回 false.

该函数在 Qt 4.3 引入。

int QPolygonF.count ( self , QPointF   value )

int QPolygonF.count ( self )

sip.voidptr QPolygonF.data ( self )

QPolygonF.fill ( self , QPointF   value , int  size  = -1)

QPointF QPolygonF.first ( self )

int QPolygonF.indexOf ( self , QPointF   value , int  from  = 0)

QPolygonF.insert ( self , int  i , QPointF   value )

QPolygonF QPolygonF.intersected ( self , QPolygonF   r )

Returns a polygon which is the intersection of this polygon and r .

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

该函数在 Qt 4.3 引入。

bool QPolygonF.isClosed ( self )

Returns true if the polygon is closed; otherwise returns false.

A polygon is said to be closed if its start point and end point are equal.

另请参阅 QVector.first () 和 QVector.last ().

bool QPolygonF.isEmpty ( self )

QPointF QPolygonF.last ( self )

int QPolygonF.lastIndexOf ( self , QPointF   value , int  from  = -1)

QPolygonF QPolygonF.mid ( self , int  pos , int  length  = -1)

QPolygonF.prepend ( self , QPointF   value )

QPolygonF.remove ( self , int  i )

QPolygonF.remove ( self , int  i , int  count )

QPolygonF.replace ( self , int  i , QPointF   value )

int QPolygonF.size ( self )

QPolygonF QPolygonF.subtracted ( self , QPolygonF   r )

Returns a polygon which is r subtracted from this polygon.

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

该函数在 Qt 4.3 引入。

QPolygonF.swap ( self , QPolygonF   other )

Swaps polygon other with this polygon. This operation is very fast and never fails.

该函数在 Qt 4.8 引入。

QPolygon QPolygonF.toPolygon ( self )

创建和返回 QPolygon by converting each QPointF 到 QPoint .

另请参阅 QPointF.toPoint ().

QPolygonF.translate ( self , QPointF   offset )

Translate all points in the polygon by the given offset .

另请参阅 translated ().

QPolygonF.translate ( self , float  dx , float  dy )

这是重载函数。

Translates all points in the polygon by ( dx , dy ).

另请参阅 translated ().

QPolygonF QPolygonF.translated ( self , QPointF   offset )

Returns a copy of the polygon that is translated by the given offset .

该函数在 Qt 4.6 引入。

另请参阅 translate ().

QPolygonF QPolygonF.translated ( self , float  dx , float  dy )

这是重载函数。

Returns a copy of the polygon that is translated by ( dx , dy ).

该函数在 Qt 4.6 引入。

另请参阅 translate ().

QPolygonF QPolygonF.united ( self , QPolygonF   r )

Returns a polygon which is the union of this polygon and r .

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

该函数在 Qt 4.3 引入。

另请参阅 intersected () 和 subtracted ().

QPointF QPolygonF.value ( self , int  i )

QPointF QPolygonF.value ( self , int  i , QPointF   defaultValue )

QPolygonF QPolygonF.__add__ ( self , QPolygonF   other )

int QPolygonF.__contains__ ( self , QPointF   value )

QPolygonF.__delitem__ ( self , int  i )

QPolygonF.__delitem__ ( self , slice  slice )

bool QPolygonF.__eq__ ( self , QPolygonF   other )

QPointF QPolygonF.__getitem__ ( self , int  i )

QPolygonF QPolygonF.__getitem__ ( self , slice  slice )

QPolygonF QPolygonF.__iadd__ ( self , QPolygonF   other )

QPolygonF QPolygonF.__iadd__ ( self , QPointF   value )

QPolygonF.__len__ ( self )

object QPolygonF.__lshift__ ( self , QPointF   value )

QPolygonF QPolygonF.__mul__ ( self , QMatrix   m )

QPolygonF QPolygonF.__mul__ ( self , QTransform   m )

bool QPolygonF.__ne__ ( self , QPolygonF   other )

QPolygonF.__setitem__ ( self , int  i , QPointF   value )

QPolygonF.__setitem__ ( self , slice  slice , QPolygonF   list )

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