QtCore.QLineF Class Reference

The QLineF class provides a two-dimensional vector using floating point precision. More...

Inheritance diagram for QtCore.QLineF:

Collaboration diagram for QtCore.QLineF:

Public Types
enum	IntersectType { BoundedIntersection = 1, NoIntersection = 0, UnboundedIntersection = 2 }
	More...

Public Member Functions
override bool	Equals (object o)
override int	GetHashCode ()
	QLineF ()
	QLineF (QLine line)
	QLineF (QLineF copy)
	QLineF (QPointF pt1, QPointF pt2)
	QLineF (double x1, double y1, double x2, double y2)
virtual void	CreateProxy ()
new double	Angle ()
new double	Angle (QLineF l)
new double	AngleTo (QLineF l)
new double	Dx ()
new double	Dy ()
new QLineF.IntersectType	Intersect (QLineF l, QPointF intersectionPoint)
new bool	IsNull ()
new QLineF	NormalVector ()
new QPointF	PointAt (double t)
new void	SetAngle (double angle)
new void	SetLine (double x1, double y1, double x2, double y2)
new void	SetPoints (QPointF p1, QPointF p2)
new QLine	ToLine ()
new void	Translate (QPointF p)
new void	Translate (double dx, double dy)
new QLineF	Translated (QPointF p)
new QLineF	Translated (double dx, double dy)
new QLineF	UnitVector ()
new double	X1 ()
new double	X2 ()
new double	Y1 ()
new double	Y2 ()
new void	Dispose ()

Static Public Member Functions
static QLineF	FromPolar (double length, double angle)
static bool	operator!= (QLineF arg1, QLineF arg2)
static bool	operator== (QLineF arg1, QLineF arg2)

Protected Member Functions
	QLineF (System.Type dummy)

Protected Attributes
SmokeInvocation	interceptor

Properties
new double	Length [get, set]
new QPointF	P1 [get, set]
new QPointF	P2 [get, set]
virtual System.IntPtr	SmokeObject [get, set]

Detailed Description

The QLineF class provides a two-dimensional vector using floating point precision.

A QLineF describes a finite length line (or line segment) on a two-dimensional surface. QLineF defines the start and end points of the line using floating point accuracy for coordinates. Use the 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 p1(), x1(), y1(), p2(), x2(), and y2() functions. The dx() and dy() functions return the horizontal and vertical components of the line, respectively.

The line's length can be retrieved using the length() function, and altered using the setLength() function. Similarly, angle() and setAngle() are respectively used for retrieving and altering the angle of the line. Use the isNull() function to determine whether the QLineF represents a valid line or a null line.

The intersect() function determines the IntersectType for this line and a given line, while the angle() function returns the angle between the lines. In addition, the unitVector() function returns a line that has the same starting point as this line, but with a length of only 1, while the 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 translate() function, and can be traversed using the pointAt() function.

See also QLine, QPolygonF, and QRectF.

Member Enumeration Documentation

enum QtCore.QLineF.IntersectType

Describes the intersection between two lines.

QLineF::UnboundedIntersection QLineF::BoundedIntersection

intersect() will also return this value if the intersect point is within the start and end point of only one of the lines.

See also intersect().

Enumerator:

BoundedIntersection	The two lines intersect with each other within the start and end points of each line.
NoIntersection	Indicates that the lines do not intersect; i.e. they are parallel.
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.

Constructor & Destructor Documentation

QtCore.QLineF.QLineF ( System.Type  dummy )

protected

QtCore.QLineF.QLineF

(

)

Constructs a null line.

QtCore.QLineF.QLineF

(

QLine

line

)

Construct a QLineF object from the given integer-based line.

See also toLine().

QtCore.QLineF.QLineF

(

QLineF

copy

)

Constructs a null line.

QtCore.QLineF.QLineF	(	QPointF	pt1,
		QPointF	pt2
	)

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

QtCore.QLineF.QLineF	(	double	x1,
		double	y1,
		double	x2,
		double	y2
	)

Constructs a null line.

Member Function Documentation

new double QtCore.QLineF.Angle

(

)

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 counter-clockwise from a point on the x-axis to the right of the origin (x > 0).

This function was introduced in Qt 4.4.

See also setAngle().

new double QtCore.QLineF.Angle

(

QLineF

l

)

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 counter-clockwise from a point on the x-axis to the right of the origin (x > 0).

This function was introduced in Qt 4.4.

See also setAngle().

new double QtCore.QLineF.AngleTo

(

QLineF

l

)

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 counter-clockwise.

This function was introduced in Qt 4.4.

See also intersect().

virtual void QtCore.QLineF.CreateProxy ( )

virtual

new void QtCore.QLineF.Dispose

(

)

new double QtCore.QLineF.Dx

(

)

Returns the horizontal component of the line's vector. Return value is positive if x2() >= x1() and negative if x2() < x1().

See also dy() and pointAt().

new double QtCore.QLineF.Dy

(

)

Returns the vertical component of the line's vector. Return value is positive if y2() >= y1() and negative if y2() < y1().

See also dx() and pointAt().

override bool QtCore.QLineF.Equals

(

object

o

)

static QLineF QtCore.QLineF.FromPolar ( double  length, double  angle  )

static

Returns a QLineF with the given length and angle.

The first point of the line will be on the origin.

Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

This function was introduced in Qt 4.4.

override int QtCore.QLineF.GetHashCode

(

)

new QLineF.IntersectType QtCore.QLineF.Intersect	(	QLineF	l,
		QPointF	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.

new bool QtCore.QLineF.IsNull

(

)

Returns true if the line is not set up with valid start and end point; otherwise returns false.

new QLineF QtCore.QLineF.NormalVector

(

)

Returns a line that is perpendicular to this line with the same starting point and length.

See also unitVector().

static bool QtCore.QLineF.operator!= ( QLineF  arg1, QLineF  arg2  )

static

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.

static bool QtCore.QLineF.operator== ( QLineF  arg1, QLineF  arg2  )

static

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.

new QPointF QtCore.QLineF.PointAt

(

double

t

)

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.

See also dx() and dy().

new void QtCore.QLineF.SetAngle

(

double

angle

)

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 counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

This function was introduced in Qt 4.4.

See also angle().

new void QtCore.QLineF.SetLine	(	double	x1,
		double	y1,
		double	x2,
		double	y2
	)

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

This function was introduced in Qt 4.4.

See also setP1(), setP2(), p1(), and p2().

new void QtCore.QLineF.SetPoints	(	QPointF	p1,
		QPointF	p2
	)

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

This function was introduced in Qt 4.4.

See also setP1(), setP2(), p1(), and p2().

new QLine QtCore.QLineF.ToLine

(

)

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 QLineF().

new void QtCore.QLineF.Translate

(

QPointF

p

)

Translates this line by the given offset.

new void QtCore.QLineF.Translate	(	double	dx,
		double	dy
	)

Translates this line by the given offset.

new QLineF QtCore.QLineF.Translated

(

QPointF

p

)

Returns this line translated by the given offset.

This function was introduced in Qt 4.4.

new QLineF QtCore.QLineF.Translated	(	double	dx,
		double	dy
	)

Returns this line translated by the given offset.

This function was introduced in Qt 4.4.

new QLineF QtCore.QLineF.UnitVector

(

)

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.

See also normalVector().

new double QtCore.QLineF.X1

(

)

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

See also p1().

new double QtCore.QLineF.X2

(

)

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

See also p2().

new double QtCore.QLineF.Y1

(

)

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

See also p1().

new double QtCore.QLineF.Y2

(

)

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

See also p2().

Member Data Documentation

SmokeInvocation QtCore.QLineF.interceptor

protected

Property Documentation

new double QtCore.QLineF.Length

getset

Returns the length of the line.

Sets the length of the line to the given length. QLineF will move the end point - p2() - of the line to give the line its new length. If the given length is negative the angle() is also changed.

If the line is a null line, the length will remain zero regardless of the length specified.

new QPointF QtCore.QLineF.P1

getset

Returns the line's start point.

Sets the starting point of this line to p1.

This function was introduced in Qt 4.4.

new QPointF QtCore.QLineF.P2

getset

Returns the line's end point.

Sets the end point of this line to p2.

This function was introduced in Qt 4.4.

virtual System.IntPtr QtCore.QLineF.SmokeObject

getset