class QLine#

The QLine class provides a two-dimensional vector using integer precision. More…

Synopsis#

Methods#

def __init__()
def __reduce__()
def __repr__()
def center()
def dx()
def dy()
def isNull()
def __ne__()
def __mul__()
def __eq__()
def p1()
def p2()
def setLine()
def setP1()
def setP2()
def setPoints()
def toLineF()
def toTuple()
def translate()
def translated()
def x1()
def x2()
def y1()
def y2()

Note

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Detailed Description#

A QLine describes a finite length line (or a line segment) on a two-dimensional surface. The start and end points of the line are specified using integer point accuracy for coordinates. Use the QLineF constructor to retrieve a floating point copy.

The positions of the line’s start and end points can be retrieved using the p1() , x1() , y1() , p2() , x2() , and y2() functions. The dx() and dy() functions return the horizontal and vertical components of the line. Use isNull() to determine whether the QLine represents a valid line or a null line.

Finally, the line can be translated a given offset using the translate() function.

See also

QLineF QRect

__init__(pt1, pt2)#

Parameters:

pt1 – QPoint
pt2 – QPoint

Constructs a line object that represents the line between p1 and p2.

__init__(x1, y1, x2, y2)

Parameters:

x1 – int
y1 – int
x2 – int
y2 – int

Constructs a line object that represents the line between (x1, y1) and (x2, y2).

__init__()

Constructs a null line.

__reduce__()#

Return type:: object

__repr__()#

Return type:: object

center()#

Return type:: QPoint

Returns the center point of this line. This is equivalent to ( p1() + p2() ) / 2, except it will never overflow.

dx()#

Return type:: int

Returns the horizontal component of the line’s vector.

See also

dy()

dy()#

Return type:: int

Returns the vertical component of the line’s vector.

See also

dx()

isNull()#

Return type:: bool

Returns true if the line does not have distinct start and end points; otherwise returns false.

__ne__(d)#

Parameters:: d – QLine
Return type:: bool

Returns true if the given line is not the same as this line.

A line is different from another line if any of their start or end points differ, or the internal order of the points is different.

__mul__(m)#

Parameters:: m – QTransform
Return type:: QLine

__eq__(d)#

Parameters:: d – QLine
Return type:: bool

Returns true if the given line is the same as this line.

A line is identical to another line if the start and end points are identical, and the internal order of the points is the same.

p1()#

Return type:: QPoint

Returns the line’s start point.

See also

setP1() x1() y1() p2()

p2()#

Return type:: QPoint

Returns the line’s end point.

See also

setP2() x2() y2() p1()

setLine(x1, y1, x2, y2)#

Parameters:

x1 – int
y1 – int
x2 – int
y2 – int

Sets this line to the start in x1, y1 and end in x2, y2.

See also

setP1() setP2() p1() p2()

setP1(p1)#

Parameters:: p1 – QPoint

Sets the starting point of this line to p1.

See also

setP2() p1()

setP2(p2)#

Parameters:: p2 – QPoint

Sets the end point of this line to p2.

See also

setP1() p2()

setPoints(p1, p2)#

Parameters:

p1 – QPoint
p2 – QPoint

Sets the start point of this line to p1 and the end point of this line to p2.

See also

setP1() setP2() p1() p2()

toLineF()#

Return type:: QLineF

Returns this line as a line with floating point accuracy.

See also

toLine()

toTuple()#

Return type:: object

translate(p)#

Parameters:: p – QPoint

Translates this line by the given offset.

translate(dx, dy)

Parameters:

dx – int
dy – int

This is an overloaded function.

Translates this line the distance specified by dx and dy.

translated(p)#

Parameters:: p – QPoint
Return type:: QLine

Returns this line translated by the given offset.

translated(dx, dy)

Parameters:

dx – int
dy – int

Return type:

QLine

This is an overloaded function.

Returns this line translated the distance specified by dx and dy.

x1()#

Return type:: int

Returns the x-coordinate of the line’s start point.

See also

p1()

x2()#

Return type:: int

Returns the x-coordinate of the line’s end point.

See also

p2()

y1()#

Return type:: int

Returns the y-coordinate of the line’s start point.

See also

p1()

y2()#

Return type:: int

Returns the y-coordinate of the line’s end point.

See also

p2()