# QPolygonF¶

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

## Detailed Description¶

A `QPolygonF` is a `QVector` < `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 `QVector` , `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 .

`QVector` `QPolygon` `QLineF`

class PySide2.QtGui.QPolygonF

PySide2.QtGui.QPolygonF(v)

PySide2.QtGui.QPolygonF(a)

PySide2.QtGui.QPolygonF(a)

PySide2.QtGui.QPolygonF(r)

PySide2.QtGui.QPolygonF(v)

PySide2.QtGui.QPolygonF(size)

param size:

int

param a:

`PySide2.QtGui.QPolygon`

param r:

`PySide2.QtCore.QRectF`

param v:

Constructs a polygon with no points.

`isEmpty()`

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

`isEmpty()`

PySide2.QtGui.QPolygonF.append(t)
Parameters:
PySide2.QtGui.QPolygonF.append(t)
Parameters:
PySide2.QtGui.QPolygonF.append(l)
Parameters:

l

PySide2.QtGui.QPolygonF.at(i)
Parameters:

i – int

Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.back()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.boundingRect()
Return type:

`PySide2.QtCore.QRectF`

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

`isEmpty()`

PySide2.QtGui.QPolygonF.capacity()
Return type:

int

PySide2.QtGui.QPolygonF.clear()
PySide2.QtGui.QPolygonF.constData()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.constFirst()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.constLast()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.contains(t)
Parameters:
Return type:

bool

PySide2.QtGui.QPolygonF.containsPoint(pt, fillRule)
Parameters:
Return type:

bool

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

PySide2.QtGui.QPolygonF.count()
Return type:

int

PySide2.QtGui.QPolygonF.count(t)
Parameters:
Return type:

int

PySide2.QtGui.QPolygonF.data()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.empty()
Return type:

bool

PySide2.QtGui.QPolygonF.endsWith(t)
Parameters:
Return type:

bool

PySide2.QtGui.QPolygonF.fill(t[, size=-1])
Parameters:
• size – int

Return type:

PySide2.QtGui.QPolygonF.first()
Return type:

`PySide2.QtCore.QPointF`

static PySide2.QtGui.QPolygonF.fromList(list)
Parameters:

list

Return type:

PySide2.QtGui.QPolygonF.front()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.indexOf(t[, from=0])
Parameters:
• from – int

Return type:

int

PySide2.QtGui.QPolygonF.insert(i, t)
Parameters:
• i – int

PySide2.QtGui.QPolygonF.insert(i, t)
Parameters:
• i – int

PySide2.QtGui.QPolygonF.insert(i, n, t)
Parameters:
• i – int

• n – int

PySide2.QtGui.QPolygonF.intersected(r)
Parameters:
Return type:

`PySide2.QtGui.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.

PySide2.QtGui.QPolygonF.intersects(r)
Parameters:
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.

PySide2.QtGui.QPolygonF.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.

`first()` `last()`

PySide2.QtGui.QPolygonF.isEmpty()
Return type:

bool

PySide2.QtGui.QPolygonF.isSharedWith(other)
Parameters:

other

Return type:

bool

PySide2.QtGui.QPolygonF.last()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.lastIndexOf(t[, from=-1])
Parameters:
• from – int

Return type:

int

PySide2.QtGui.QPolygonF.length()
Return type:

int

PySide2.QtGui.QPolygonF.mid(pos[, len=-1])
Parameters:
• pos – int

• len – int

Return type:

PySide2.QtGui.QPolygonF.move(from, to)
Parameters:
• from – int

• to – int

PySide2.QtGui.QPolygonF.__ne__(v)
Parameters:

v

Return type:

bool

PySide2.QtGui.QPolygonF.__mul__(m)
Parameters:
Return type:

`PySide2.QtGui.QPolygonF`

PySide2.QtGui.QPolygonF.__mul__(m)
Parameters:
Return type:

`PySide2.QtGui.QPolygonF`

Parameters:

l

Return type:

Parameters:
Return type:

Parameters:
Return type:

PySide2.QtGui.QPolygonF.__lshift__(t)
Parameters:
Return type:

PySide2.QtGui.QPolygonF.__eq__(v)
Parameters:

v

Return type:

bool

PySide2.QtGui.QPolygonF.operator[](i)
Parameters:

i – int

Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.pop_back()
PySide2.QtGui.QPolygonF.pop_front()
PySide2.QtGui.QPolygonF.prepend(t)
Parameters:
PySide2.QtGui.QPolygonF.prepend(t)
Parameters:
PySide2.QtGui.QPolygonF.push_back(t)
Parameters:
PySide2.QtGui.QPolygonF.push_back(t)
Parameters:
PySide2.QtGui.QPolygonF.push_front(t)
Parameters:
PySide2.QtGui.QPolygonF.push_front(t)
Parameters:
PySide2.QtGui.QPolygonF.remove(i)
Parameters:

i – int

PySide2.QtGui.QPolygonF.remove(i, n)
Parameters:
• i – int

• n – int

PySide2.QtGui.QPolygonF.removeAll(t)
Parameters:
Return type:

int

PySide2.QtGui.QPolygonF.removeAt(i)
Parameters:

i – int

PySide2.QtGui.QPolygonF.removeFirst()
PySide2.QtGui.QPolygonF.removeLast()
PySide2.QtGui.QPolygonF.removeOne(t)
Parameters:
Return type:

bool

PySide2.QtGui.QPolygonF.replace(i, t)
Parameters:
• i – int

PySide2.QtGui.QPolygonF.reserve(size)
Parameters:

size – int

PySide2.QtGui.QPolygonF.resize(size)
Parameters:

size – int

PySide2.QtGui.QPolygonF.setSharable(sharable)
Parameters:

sharable – bool

PySide2.QtGui.QPolygonF.shrink_to_fit()
PySide2.QtGui.QPolygonF.size()
Return type:

int

PySide2.QtGui.QPolygonF.squeeze()
PySide2.QtGui.QPolygonF.startsWith(t)
Parameters:
Return type:

bool

PySide2.QtGui.QPolygonF.subtracted(r)
Parameters:
Return type:

`PySide2.QtGui.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.

PySide2.QtGui.QPolygonF.swap(other)
Parameters:

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

PySide2.QtGui.QPolygonF.swapItemsAt(i, j)
Parameters:
• i – int

• j – int

PySide2.QtGui.QPolygonF.takeAt(i)
Parameters:

i – int

Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.takeFirst()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.takeLast()
Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.toList()
Return type:

PySide2.QtGui.QPolygonF.toPolygon()
Return type:

`PySide2.QtGui.QPolygon`

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

`toPoint()`

PySide2.QtGui.QPolygonF.translate(offset)
Parameters:

Translate all points in the polygon by the given `offset` .

PySide2.QtGui.QPolygonF.translate(dx, dy)
Parameters:
• dx – float

• dy – float

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

PySide2.QtGui.QPolygonF.translated(offset)
Parameters:
Return type:

`PySide2.QtGui.QPolygonF`

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

PySide2.QtGui.QPolygonF.translated(dx, dy)
Parameters:
• dx – float

• dy – float

Return type:

`PySide2.QtGui.QPolygonF`

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

PySide2.QtGui.QPolygonF.united(r)
Parameters:
Return type:

`PySide2.QtGui.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.

PySide2.QtGui.QPolygonF.value(i)
Parameters:

i – int

Return type:

`PySide2.QtCore.QPointF`

PySide2.QtGui.QPolygonF.value(i, defaultValue)
Parameters:
Return type:

`PySide2.QtCore.QPointF`