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LineDirection Property

Gets the direction of this line segment. The length of the direction vector equals the length of the line segment.

Namespace:  Rhino.Geometry
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 5.0
public Vector3d Direction { get; }

Property Value

Type: Vector3d
using Rhino.Geometry;

partial class Examples
  public static Rhino.Commands.Result IntersectLines(Rhino.RhinoDoc doc)
    Rhino.Input.Custom.GetObject go = new Rhino.Input.Custom.GetObject();
    go.SetCommandPrompt( "Select lines" );
    go.GeometryFilter = Rhino.DocObjects.ObjectType.Curve;
    go.GetMultiple( 2, 2);
    if( go.CommandResult() != Rhino.Commands.Result.Success )
      return go.CommandResult();
    if( go.ObjectCount != 2 )
      return Rhino.Commands.Result.Failure;

    LineCurve crv0 = go.Object(0).Geometry() as LineCurve;
    LineCurve crv1 = go.Object(1).Geometry() as LineCurve;
    if( crv0==null || crv1==null )
      return Rhino.Commands.Result.Failure;

    Line line0 = crv0.Line;
    Line line1 = crv1.Line;
    Vector3d v0 = line0.Direction;
    Vector3d v1 = line1.Direction;

    if( v0.IsParallelTo(v1) != 0 )
      Rhino.RhinoApp.WriteLine("Selected lines are parallel.");
      return Rhino.Commands.Result.Nothing;

    double a, b;
    if( !Rhino.Geometry.Intersect.Intersection.LineLine(line0, line1, out a, out b))
      Rhino.RhinoApp.WriteLine("No intersection found.");
      return Rhino.Commands.Result.Nothing;

    Point3d pt0 = line0.PointAt(a);
    Point3d pt1 = line1.PointAt(b);
    // pt0 and pt1 should be equal, so we will only add pt0 to the document
    doc.Objects.AddPoint( pt0 );
    return Rhino.Commands.Result.Success;
import Rhino
import scriptcontext

def IntersectLines():
    go = Rhino.Input.Custom.GetObject()
    go.SetCommandPrompt( "Select lines" )
    go.GeometryFilter = Rhino.DocObjects.ObjectType.Curve
    go.GetMultiple( 2, 2)
    if go.CommandResult()!=Rhino.Commands.Result.Success:
      return go.CommandResult()
    if go.ObjectCount!=2: return Rhino.Commands.Result.Failure

    crv0 = go.Object(0).Geometry()
    crv1 = go.Object(1).Geometry()
    if not crv0 or not crv1: return Rhino.Commands.Result.Failure

    line0 = crv0.Line
    line1 = crv1.Line
    v0 = line0.Direction
    v1 = line1.Direction

    if v0.IsParallelTo(v1)!=0:
        print "Selected lines are parallel."
        return Rhino.Commands.Result.Nothing

    rc, a, b = Rhino.Geometry.Intersect.Intersection.LineLine(line0, line1)
    if not rc:
        print "No intersection found."
        return Rhino.Commands.Result.Nothing

    pt0 = line0.PointAt(a)
    pt1 = line1.PointAt(b)
    # pt0 and pt1 should be equal, so we will only add pt0 to the document
    return Rhino.Commands.Result.Success

if __name__=="__main__":
See Also