Easier way to extend and trim curves?

Scripting
,
1

Is there a way to extend and trim a pair of curves by each other to where they would/do intersect? I’m hoping to be able to treat them like if you used the fillet command with a 0 radius. It’s just a huge pain to have to test and correct curve directions to extend them in the right way.

2

Try the “Connect” command.

3

Thanks for the reply, but I meant in the context of python scripting. I could use the command function, but it’s kinda clunky.

4

Ahh, sorry, missed the Scripting category assignment.

5

Hi @Bailey
You could make a very simple method

x = (b2 - b1) / (m1 - m2)
y = m1 * x + b1

Based on the point p. you can then trim or extend.
This is the method :
def find_intersection(line1, line2):
    m1, b1 = get_line_params(line1)
    m2, b2 = get_line_params(line2)
    x = (b2 - b1) / (m1 - m2)
    y = m1 * x + b1
    return Rhino.Geometry.Point3d(x, y, 0)

You can use it like this

def fancy_intersection(line1, line2):
    # Get the parameters of the lines
    m1, b1 = get_line_params(line1)
    m2, b2 = get_line_params(line2)
    x = (b2 - b1) / (m1 - m2)
    y = m1 * x + b1
    return Rhino.Geometry.Point3d(x, y, 0)

def ExtendTrimCurves():
    curve1_id = rs.GetObject("Select first curve", rs.filter.curve)
    curve2_id = rs.GetObject("Select second curve", rs.filter.curve)
    if curve1_id is None or curve2_id is None:
        return
    curve1 = rs.coercecurve(curve1_id)
    curve2 = rs.coercecurve(curve2_id)
    line1 = Rhino.Geometry.Line(curve1.PointAtStart, curve1.PointAtEnd)
    line2 = Rhino.Geometry.Line(curve2.PointAtStart, curve2.PointAtEnd)
    intersection_point = fancy_intersection(line1, line2)
    extension_length1 = curve1.PointAtEnd.DistanceTo(intersection_point)
    extension_length2 = curve2.PointAtEnd.DistanceTo(intersection_point)

    # Extend the curves
    curve1_extended = curve1.Extend(Rhino.Geometry.CurveEnd.End, extension_length1, Rhino.Geometry.CurveExtensionStyle.Line)
    curve2_extended = curve2.Extend(Rhino.Geometry.CurveEnd.End, extension_length2, Rhino.Geometry.CurveExtensionStyle.Line)

    sc.doc.Objects.Add(curve1_extended)
    sc.doc.Objects.Add(curve2_extended)

ExtendTrimCurves()