Overlap domain

Scripting
1

Hello,

I have a Polyline that has two line segments that overlap each other:
Example.3dm (31.8 KB)

Example
Example837×511 11.6 KB

I need the domain between these two overlapping segments:

import rhinoscriptsyntax as rs
curve = rs.GetObject(“Get Curve”, rs.filter.curve)
point = rs.GetPointOnCurve(curve, “Pick a test point”)
domain = rs.CurveDomain(curve)
cutpoint = rs.CurveClosestPoint( curve, point,0 );
print domain
print cutpoint

In this case the returns domain is always from the top line, and I also need the bottom line domain, how can I choose which domain to return?

Top curve or bottom curve?
Domain closer to the start point, or closer to the end point??

Any idea?

2

You could maybe check for self intersection and evaluate the start and end intersect parameters…

import rhinoscriptsyntax as rs

curve = rs.GetObject("Get Curve", rs.filter.curve)
# if only one curve is supplied as an argument, it checks for self intersections...
insec=rs.CurveCurveIntersection(curve)
if insec and len(insec)==2:
    dom_start=min(insec[0][5],insec[1][5])
    dom_end=max(insec[0][5],insec[1][5])
    print "Olap domain start={} | Olap domain end={}".format(dom_start,dom_end)
    #check
    rs.AddPoint(rs.EvaluateCurve(curve,dom_start))
    rs.AddPoint(rs.EvaluateCurve(curve,dom_end))
else:
    print "Curve does not self-intersect"
3

Thanks @Helvetosaur,

I can’t see how it can help me, intersection give me the start/end intersection domains, this curve actually has 4 intersection domains.

I don’t understand your idea.

Thanks

4

Perhaps it’s me that’s not understanding your idea… What are you trying to do once you have the overlap points?

5

I already solved it in another way, but it’s good to try a way to do this in overlapping curves.

Basically:
i’m trying to fillet the first and last vertice:

fillet
fillet1014×620 17.8 KB
:

I try get the domain for trim the curve, and EX: I get the CurveEndPoint and find the curve
domain for trim.

The problem is on overlapping curves, the domain is all the same.

Did I explain?

6

Is that like a 2D CAM toolpath with an approach path and a radius entry/exit?

I can see the problem using the typical fillet tools, which require getting the trim parameters. I wonder if this - which doesn’t depend on parameters - might work better:

https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Curve_CreateFilletCurves.htm

As a radical solution could be to split the rectangle away from the overlap area - say at the upper right and lower right corners - then you will have two separate curves. Do your filleting on each and join all back together afterward.

7

Hello @Helvetosaur,

Yes is correct.

At this point I solved with a radical solution, exploded the curve, making fillet and then putting everything join together, a little more work but it works.

Thanks