Class IntersectionComputer

Functions to compute intersection points between lines and line segments.

In general it is not possible to compute the intersection point of two lines exactly, due to numerical roundoff. This is particularly true when the lines are nearly parallel. These routines uses numerical conditioning on the input values to ensure that the computed value is very close to the correct value.

The Z-ordinate is ignored, and not populated.
Inheritance
object
IntersectionComputer
Inherited Members
Namespace: NetTopologySuite.Algorithm
Assembly: NetTopologySuite.dll
Syntax
public class IntersectionComputer
Remarks

NOTE: In JTS this function is called Intersection.

Methods

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Intersection(Coordinate, Coordinate, Coordinate, Coordinate)

Computes the intersection point of two lines. If the lines are parallel or collinear this case is detected and null is returned.

Declaration
public static Coordinate Intersection(Coordinate p1, Coordinate p2, Coordinate q1, Coordinate q2)
Parameters
Type Name Description
Coordinate p1

An endpoint of line 1
Coordinate p2

An endpoint of line 1
Coordinate q1

An endpoint of line 2
Coordinate q2

An endpoint of line 2
Returns
Type Description
Coordinate

The intersection point between the lines, if there is one, or null if the lines are parallel or collinear
See Also
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LineSegment(Coordinate, Coordinate, Coordinate, Coordinate)

Computes the intersection point of a line and a line segment (if any). There will be no intersection point if:

If the segment is collinear with the line the first segment endpoint is returned.

Declaration
public static Coordinate LineSegment(Coordinate line1, Coordinate line2, Coordinate seg1, Coordinate seg2)
Parameters
Type Name Description
Coordinate line1
Coordinate line2
Coordinate seg1
Coordinate seg2
Returns
Type Description
Coordinate

The intersection point, or null if it is not possible to find an intersection