Public Shared Function LineLineIntersection ( _
	ByRef p0 As PointD, _
	ByRef p1 As PointD, _
	ByRef p2 As PointD, _
	ByRef p3 As PointD, _
	<OutAttribute> ByRef intersectionPoint As PointD, _
	<OutAttribute> ByRef tVal As Double, _
	<OutAttribute> ByRef vVal As Double _
) As Boolean

public static bool LineLineIntersection(
	ref PointD p0,
	ref PointD p1,
	ref PointD p2,
	ref PointD p3,
	out PointD intersectionPoint,
	out double tVal,
	out double vVal
)

public:
static bool LineLineIntersection(
	PointD% p0, 
	PointD% p1, 
	PointD% p2, 
	PointD% p3, 
	[OutAttribute] PointD% intersectionPoint, 
	[OutAttribute] double% tVal, 
	[OutAttribute] double% vVal
)

EGIS.ShapeFileLib.GeometryAlgorithms.lineLineIntersection = function(p0, p1, p2, p3, intersectionPoint, tVal, vVal);

Return Value

This method tests "infinite" lines defined by two points on the line. Line 1 is defined as the line passing through points p0 and p1. Line 2 is defined as the line passing through points p2 and p3

The two lines will not intersect if the lines are parallel and the method will return false. If either p0 == p1 or p2 == p3 then a line cannot be defined and the method will return false;

The tVal and vVal are from the parametric representations of the lines in the equations:
line1 : (X,Y) = p0 + (t * (p1 - p0))
: X = p0.X + (t * (p1.X-p0.X))
: Y = p0.Y + (t * (p1.Y-p0.Y))
The tVal returned indicates where on Line1 the intersection ocurrs.
If tVal < 0 the intersection ocurrs before p0 on the line.
If tVal > 1 the intersection ocurrs after p1 on the line.
If tVal is between 0 and 1 the intersection ocurrs between p0 and p1 on the line