The PySide.QtCore.QLineF class provides a twodimensional vector using floating point precision.
A PySide.QtCore.QLineF describes a finite length line (or line segment) on a twodimensional surface. PySide.QtCore.QLineF defines the start and end points of the line using floating point accuracy for coordinates. Use the PySide.QtCore.QLineF.toLine() function to retrieve an integer based copy of this line.
The positions of the line’s start and end points can be retrieved using the PySide.QtCore.QLineF.p1() , PySide.QtCore.QLineF.x1() , PySide.QtCore.QLineF.y1() , PySide.QtCore.QLineF.p2() , PySide.QtCore.QLineF.x2() , and PySide.QtCore.QLineF.y2() functions. The PySide.QtCore.QLineF.dx() and PySide.QtCore.QLineF.dy() functions return the horizontal and vertical components of the line, respectively.
The line’s length can be retrieved using the PySide.QtCore.QLineF.length() function, and altered using the PySide.QtCore.QLineF.setLength() function. Similarly, PySide.QtCore.QLineF.angle() and PySide.QtCore.QLineF.setAngle() are respectively used for retrieving and altering the angle of the line. Use the PySide.QtCore.QLineF.isNull() function to determine whether the PySide.QtCore.QLineF represents a valid line or a null line.
The PySide.QtCore.QLineF.intersect() function determines the QLineF.IntersectType for this line and a given line, while the PySide.QtCore.QLineF.angle() function returns the angle between the lines. In addition, the PySide.QtCore.QLineF.unitVector() function returns a line that has the same starting point as this line, but with a length of only 1, while the PySide.QtCore.QLineF.normalVector() function returns a line that is perpendicular to this line with the same starting point and length.
Finally, the line can be translated a given offset using the PySide.QtCore.QLineF.translate() function, and can be traversed using the PySide.QtCore.QLineF.pointAt() function.
Parameters: 


Constructs a null line.
Construct a PySide.QtCore.QLineF object from the given integerbased line .
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Constructs a line object that represents the line between p1 and p2 .
Constructs a line object that represents the line between (x1 , y1 ) and (x2 , y2 ).
Describes the intersection between two lines.
QLineF.UnboundedIntersection  QLineF.BoundedIntersection 
Constant  Description 

QLineF.NoIntersection  Indicates that the lines do not intersect; i.e. they are parallel. 
QLineF.UnboundedIntersection  The two lines intersect, but not within the range defined by their lengths. This will be the case if the lines are not parallel. 
PySide.QtCore.QLineF.intersect() will also return this value if the intersect point is within the start and end point of only one of the lines.
Constant  Description 

QLineF.BoundedIntersection  The two lines intersect with each other within the start and end points of each line. 
See also
Return type:  PyObject 

Return type:  PyObject 

Parameters:  l – PySide.QtCore.QLineF 

Return type:  PySide.QtCore.qreal 
Returns the angle (in degrees) between this line and the given line , taking the direction of the lines into account. If the lines do not intersect within their range, it is the intersection point of the extended lines that serves as origin (see QLineF.UnboundedIntersection ).
When the lines are parallel, this function returns 0 if they have the same direction; otherwise it returns 180.
See also
Return type:  PySide.QtCore.qreal 

Returns the angle of the line in degrees.
The return value will be in the range of values from 0.0 up to but not including 360.0. The angles are measured counterclockwise from a point on the xaxis to the right of the origin (x > 0).
See also
Parameters:  l – PySide.QtCore.QLineF 

Return type:  PySide.QtCore.qreal 
Returns the angle (in positive degrees) from this line to the given line , taking the direction of the lines into account. If the lines do not intersect within their range, it is the intersection point of the extended lines that serves as origin (see QLineF.UnboundedIntersection ).
The returned value represents the number of degrees you need to add to this line to make it have the same angle as the given line , going counterclockwise.
See also
Return type:  PySide.QtCore.qreal 

Returns the horizontal component of the line’s vector. Return value is positive if PySide.QtCore.QLineF.x2() >= PySide.QtCore.QLineF.x1() and negative if PySide.QtCore.QLineF.x2() < PySide.QtCore.QLineF.x1() .
Return type:  PySide.QtCore.qreal 

Returns the vertical component of the line’s vector. Return value is positive if PySide.QtCore.QLineF.y2() >= PySide.QtCore.QLineF.y1() and negative if PySide.QtCore.QLineF.y2() < PySide.QtCore.QLineF.y1() .
Parameters: 


Return type: 
Returns a PySide.QtCore.QLineF with the given length and angle .
The first point of the line will be on the origin.
Positive values for the angles mean counterclockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o’clock position.
Parameters:  l – PySide.QtCore.QLineF 

Return type:  (intersectType, intersectionPoint) 
Returns a value indicating whether or not this line intersects with the given line .
The actual intersection point is extracted to intersectionPoint (if the pointer is valid). If the lines are parallel, the intersection point is undefined.
Return type:  PySide.QtCore.bool 

Returns true if the line is not set up with valid start and end point; otherwise returns false.
Return type:  PySide.QtCore.qreal 

Returns the length of the line.
See also
Return type:  PySide.QtCore.QLineF 

Returns a line that is perpendicular to this line with the same starting point and length.
See also
Parameters:  d – PySide.QtCore.QLineF 

Return type:  PySide.QtCore.bool 
Returns true if the given line is not the same as this line.
A line is different from another line if their start or end points differ, or the internal order of the points is different.
Parameters:  m – PySide.QtGui.QMatrix 

Return type:  PySide.QtCore.QLineF 
Parameters:  m – PySide.QtGui.QTransform 

Return type:  PySide.QtCore.QLineF 
Parameters:  d – PySide.QtCore.QLineF 

Return type:  PySide.QtCore.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.
Return type:  PySide.QtCore.QPointF 

Returns the line’s start point.
Return type:  PySide.QtCore.QPointF 

Returns the line’s end point.
Parameters:  t – PySide.QtCore.qreal 

Return type:  PySide.QtCore.QPointF 
Returns the point at the parameterized position specified by t . The function returns the line’s start point if t = 0, and its end point if t = 1.
Parameters:  angle – PySide.QtCore.qreal 

Sets the angle of the line to the given angle (in degrees). This will change the position of the second point of the line such that the line has the given angle.
Positive values for the angles mean counterclockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o’clock position.
See also
Parameters:  len – PySide.QtCore.qreal 

Sets the length of the line to the given length . PySide.QtCore.QLineF will move the end point  PySide.QtCore.QLineF.p2()  of the line to give the line its new length. If the given length is negative the PySide.QtCore.QLineF.angle() is also changed.
If the line is a null line, the length will remain zero regardless of the length specified.
Parameters: 


Sets this line to the start in x1 , y1 and end in x2 , y2 .
Parameters:  p1 – PySide.QtCore.QPointF 

Sets the starting point of this line to p1 .
Parameters:  p2 – PySide.QtCore.QPointF 

Sets the end point of this line to p2 .
Parameters: 


Sets the start point of this line to p1 and the end point of this line to p2 .
Return type:  PySide.QtCore.QLine 

Returns an integer based copy of this line.
Note that the returned line’s start and end points are rounded to the nearest integer.
See also
PySide.QtCore.QLineF.QLineF()
Return type:  PyObject 

Parameters:  p – PySide.QtCore.QPointF 

Translates this line by the given offset .
Parameters: 


This is an overloaded function.
Translates this line the distance specified by dx and dy .
Parameters:  p – PySide.QtCore.QPointF 

Return type:  PySide.QtCore.QLineF 
Returns this line translated by the given offset .
Parameters: 


Return type: 
This is an overloaded function.
Returns this line translated the distance specified by dx and dy .
Return type:  PySide.QtCore.QLineF 

Returns the unit vector for this line, i.e a line starting at the same point as this line with a length of 1.0.
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Return type:  PySide.QtCore.qreal 

Returns the xcoordinate of the line’s start point.
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Return type:  PySide.QtCore.qreal 

Returns the xcoordinate of the line’s end point.
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Return type:  PySide.QtCore.qreal 

Returns the ycoordinate of the line’s start point.
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Return type:  PySide.QtCore.qreal 

Returns the ycoordinate of the line’s end point.
See also