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QPolygon Class Reference

[ QtGui module]

The QPolygon class provides a vector of points using integer precision. 更多...

方法

Special Methods

详细描述

This class can be pickled.

The QPolygon class provides a vector of points using integer precision.

A QPolygon object is a QVector < QPoint >. The easiest way to add points to a QPolygon is to use QVector 's streaming operator, as illustrated below: 

         QPolygon polygon;
         polygon << QPoint(10, 20) << QPoint(20, 30);

In addition to the functions provided by QVector , QPolygon provides some point-specific 函数。

Each point in a polygon can be retrieved by passing its index to the point () function. To populate the polygon, QPolygon provides the setPoint () function to set the point at a given index, the setPoints () function to set all the points in the polygon (resizing it to the given number of points), 和 putPoints () function which copies a number of given points into the polygon from a specified index (resizing the polygon if necessary).

QPolygon provides the boundingRect () 和 translate () functions for geometry functions. Use the QMatrix.map () function for more general transformations of QPolygons.

The QPolygon class is implicitly shared .

方法文档编制

QPolygon.__init__ ( self )

Constructs a polygon with no points.

另请参阅 QVector.isEmpty ().

QPolygon.__init__ ( self , QPolygon   a )

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

另请参阅 QVector.isEmpty ().

QPolygon.__init__ ( self , list-of-QPoint  v )

构造副本为给定 polygon .

另请参阅 setPoints ().

QPolygon.__init__ ( self , QRect   rectangle , bool  closed  = False)

Constructs a polygon containing the specified points .

另请参阅 setPoints ().

QPolygon.__init__ ( self , int  asize )

Constructs a polygon from the given rectangle 。若 closed is false, the polygon just contains the four points of the rectangle ordered clockwise, otherwise the polygon's fifth point is set to rectangle .topLeft().

Note that the bottom-right corner of the rectangle is located at (rectangle.x() + rectangle.width(), rectangle.y() + rectangle.height()).

另请参阅 setPoints ().

QPolygon.__init__ ( self , list-of-int  points )

QPolygon.__init__ ( self , QVariant  variant )

QPolygon.append ( self , QPoint   value )

QPoint QPolygon.at ( self , int  i )

QRect QPolygon.boundingRect ( self )

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

另请参阅 QVector.isEmpty ().

QPolygon.clear ( self )

bool QPolygon.contains ( self , QPoint   value )

bool QPolygon.containsPoint ( self , QPoint   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 QPolygon.count ( self , QPoint   value )

int QPolygon.count ( self )

sip.voidptr QPolygon.data ( self )

QPolygon.fill ( self , QPoint   value , int  size  = -1)

QPoint QPolygon.first ( self )

int QPolygon.indexOf ( self , QPoint   value , int  from  = 0)

QPolygon.insert ( self , int  i , QPoint   value )

QPolygon QPolygon.intersected ( self , QPolygon   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 QPolygon.isEmpty ( self )

QPoint QPolygon.last ( self )

int QPolygon.lastIndexOf ( self , QPoint   value , int  from  = -1)

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

QPoint QPolygon.point ( self , int  index )

Extracts the coordinates of the point at the given index to * x and * y (if they are valid pointers).

另请参阅 setPoint ().

QPolygon.prepend ( self , QPoint   value )

QPolygon.putPoints ( self , int  index , int  firstx , int  firsty , ...)

拷贝 nPoints points from the variable argument list into this polygon from the given index .

The points are given as a sequence of integers, starting with firstx then firsty , and so on. The polygon is resized if index+nPoints exceeds its current size.

The example code creates a polygon with three points (4,5), (6,7) and (8,9), by expanding the polygon from 1 to 3 points: 

         QPolygon polygon(1);
         polygon[0] = QPoint(4, 5);
         polygon.putPoints(1, 2, 6,7, 8,9);

The following code has the same result, but here the putPoints() function overwrites rather than extends: 

         QPolygon polygon(3);
         polygon.putPoints(0, 3, 4,5, 0,0, 8,9);
         polygon.putPoints(1, 1, 6,7);

另请参阅 setPoints ().

QPolygon.putPoints ( self , int  index , int  nPoints , QPolygon   fromPolygon , int  from  = 0)

QPolygon.remove ( self , int  i )

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

QPolygon.replace ( self , int  i , QPoint   value )

QPolygon.setPoint ( self , int  index , QPoint   pt )

Sets the point at the given index to the point specified by ( x , y ).

另请参阅 point (), putPoints ()，和 setPoints ().

QPolygon.setPoint ( self , int  index , int  x , int  y )

这是重载函数。

Sets the point at the given index 到给定 point .

QPolygon.setPoints ( self , list-of-int  points )

Resizes the polygon to nPoints and populates it with the given points .

The example code creates a polygon with two points (10, 20) and (30, 40): 

         static const int points[] = { 10, 20, 30, 40 };
         QPolygon polygon;
         polygon.setPoints(2, points);

另请参阅 setPoint () and putPoints ().

QPolygon.setPoints ( self , int  firstx , int  firsty , ...)

这是重载函数。

Resizes the polygon to nPoints and populates it with the points specified by the variable argument list. The points are given as a sequence of integers, starting with firstx then firsty , and so on.

The example code creates a polygon with two points (10, 20) and (30, 40): 

         QPolygon polygon;
         polygon.setPoints(2, 10, 20, 30, 40);

int QPolygon.size ( self )

QPolygon QPolygon.subtracted ( self , QPolygon   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。

QPolygon.swap ( self , QPolygon   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.translate ( self , int  dx , int  dy )

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

另请参阅 translated ().

QPolygon.translate ( self , QPoint   offset )

这是重载函数。

Translates all points in the polygon by the given offset .

另请参阅 translated ().

QPolygon QPolygon.translated ( self , int  dx , int  dy )

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 ().

QPolygon QPolygon.translated ( self , QPoint   offset )

这是重载函数。

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 ().

QPolygon QPolygon.united ( self , QPolygon   r )

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

Set operations on polygons, will treat the polygons as areas, and implicitly close the polygon.

该函数在 Qt 4.3 引入。

另请参阅 intersected () 和 subtracted ().

QPoint QPolygon.value ( self , int  i )

QPoint QPolygon.value ( self , int  i , QPoint   defaultValue )

QPolygon QPolygon.__add__ ( self , QPolygon   other )

int QPolygon.__contains__ ( self , QPoint   value )

QPolygon.__delitem__ ( self , int  i )

QPolygon.__delitem__ ( self , slice  slice )

bool QPolygon.__eq__ ( self , QPolygon   other )

QPoint QPolygon.__getitem__ ( self , int  i )

QPolygon QPolygon.__getitem__ ( self , slice  slice )

QPolygon QPolygon.__iadd__ ( self , QPolygon   other )

QPolygon QPolygon.__iadd__ ( self , QPoint   value )

QPolygon.__len__ ( self )

object QPolygon.__lshift__ ( self , QPoint   value )

QPolygon QPolygon.__mul__ ( self , QMatrix   m )

QPolygon QPolygon.__mul__ ( self , QTransform   m )

bool QPolygon.__ne__ ( self , QPolygon   other )

QPolygon.__setitem__ ( self , int  i , QPoint   value )

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

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