class QPolygonF#

The QPolygonF class provides a list of points using floating point precision. More…

Synopsis#

Methods#

def __init__()
def append()
def at()
def back()
def boundingRect()
def capacity()
def clear()
def constData()
def constFirst()
def constLast()
def containsPoint()
def count()
def data()
def empty()
def first()
def front()
def insert()
def intersected()
def intersects()
def isClosed()
def isEmpty()
def isSharedWith()
def last()
def length()
def mid()
def move()
def __mul__()
def __add__()
def operator[]()
def pop_back()
def pop_front()
def prepend()
def push_back()
def push_front()
def remove()
def removeAll()
def removeAt()
def removeFirst()
def removeLast()
def removeOne()
def reserve()
def resize()
def shrink_to_fit()
def size()
def sliced()
def squeeze()
def subtracted()
def swap()
def swapItemsAt()
def takeAt()
def toList()
def toPolygon()
def toVector()
def translate()
def translated()
def united()
def value()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description#

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

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

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

In addition to the functions provided by QList, QPolygonF provides the boundingRect() and translate() functions for geometry operations. Use the 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.

See also

QPolygon QLineF

__init__(v)#

Parameters:: v – .list of QPointF

Constructs a polygon containing the specified points.

__init__()

Constructs a polygon with no points.

See also

isEmpty()

__init__(r)

Parameters:: r – QRectF

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.

See also

isClosed()

__init__(a)

Parameters:: a – QPolygon

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

See also

toPolygon()

append(arg__1)#

Parameters:: arg__1 – QPointF

append(l)

Parameters:: l – .list of QPointF

at(i)#

Parameters:: i – int
Return type:: QPointF

back()#

Return type:: QPointF

boundingRect()#

Return type:: QRectF

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

See also

isEmpty()

capacity()#

Return type:: int

clear()#

constData()#

Return type:: QPointF

constFirst()#

Return type:: QPointF

constLast()#

Return type:: QPointF

containsPoint(pt, fillRule)#

Parameters:

pt – QPointF
fillRule – FillRule

Return type:

bool

Returns true if the given point is inside the polygon according to the specified fillRule; otherwise returns false.

count()#

Return type:: int

data()#

Return type:: QPointF

empty()#

Return type:: bool

first(n)#

Parameters:: n – int
Return type:: .list of QPointF

first()

Return type:: QPointF

static fromList(list)#

Parameters:: list – .list of QPointF
Return type:: .list of QPointF

static fromVector(vector)#

Parameters:: vector – .list of QPointF
Return type:: .list of QPointF

front()#

Return type:: QPointF

insert(arg__1, arg__2)#

Parameters:

arg__1 – int
arg__2 – QPointF

intersected(r)#

Parameters:: r – QPolygonF
Return type:: QPolygonF

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.

See also

intersects()

intersects(r)#

Parameters:: r – QPolygonF
Return type:: bool

Returns true if the current polygon intersects at any point the given polygon p. Also returns true if the current polygon contains or is contained by any part of p.

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

See also

intersected()

isClosed()#

Return type:: bool

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.

See also

last()

isEmpty()#

Return type:: bool

isSharedWith(other)#

Parameters:: other – .list of QPointF
Return type:: bool

last()#

Return type:: QPointF

last(n)

Parameters:: n – int
Return type:: .list of QPointF

length()#

Return type:: int

mid(pos[, len=-1])#

Parameters:

pos – int
len – int

Return type:

.list of QPointF

move(from, to)#

Parameters:

from – int
to – int

__mul__(m)#

Parameters:: m – QTransform
Return type:: QPolygonF

__add__(l)#

Parameters:: l – .list of QPointF
Return type:: .list of QPointF

operator(i)#

Parameters:: i – int
Return type:: QPointF

pop_back()#

pop_front()#

prepend(arg__1)#

Parameters:: arg__1 – QPointF

push_back(arg__1)#

Parameters:: arg__1 – QPointF

push_front(arg__1)#

Parameters:: arg__1 – QPointF

remove(i[, n=1])#

Parameters:

i – int
n – int

removeAll(arg__1)#

Parameters:: arg__1 – QPointF

removeAt(i)#

Parameters:: i – int

removeFirst()#

removeLast()#

removeOne(arg__1)#

Parameters:: arg__1 – QPointF

reserve(size)#

Parameters:: size – int

resize(size)#

Parameters:: size – int

shrink_to_fit()#

size()#

Return type:: int

sliced(pos)#

Parameters:: pos – int
Return type:: .list of QPointF

sliced(pos, n)

Parameters:

pos – int
n – int

Return type:

.list of QPointF

squeeze()#

subtracted(r)#

Parameters:: r – QPolygonF
Return type:: QPolygonF

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.

swap(other)#

Parameters:: other – QPolygonF

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

swapItemsAt(i, j)#

Parameters:

i – int
j – int

takeAt(i)#

Parameters:: i – int
Return type:: QPointF

toList()#

Return type:: .list of QPointF

toPolygon()#

Return type:: QPolygon

Creates and returns a QPolygon by converting each QPointF to a QPoint.

See also

toPoint()

toVector()#

Return type:: .list of QPointF

translate(offset)#

Parameters:: offset – QPointF

Translate all points in the polygon by the given offset.

See also

translated()

translate(dx, dy)

Parameters:

dx – float
dy – float

This is an overloaded function.

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

See also

translated()

translated(offset)#

Parameters:: offset – QPointF
Return type:: QPolygonF

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

See also

translate()

translated(dx, dy)

Parameters:

dx – float
dy – float

Return type:

QPolygonF

This is an overloaded function.

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

See also

translate()

united(r)#

Parameters:: r – QPolygonF
Return type:: QPolygonF

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.

See also

intersected() subtracted()

value(i)#

Parameters:: i – int
Return type:: QPointF