topic Re: Traceboundary or... in .NET Forum

Traceboundary or...

fieldguy — Thu, 01 Mar 2018 17:56:55 GMT

I need to find perpendicular distances from line work to a point. It looks like I can use Traceboundary, but I need to know the best way to:

1) save the current layer status

2) freeze all layers except the layers the boundary objects are on

3) get the polyline from traceboundary (I have this part already)

4) restore the user's layer status

Or, is there another way? I looked at ray but I don't see how to implement the perpendicular part.

In the attached image, I need to calculate the distances.

Re: Traceboundary or...

norman.yuan — Thu, 01 Mar 2018 19:57:04 GMT

In one of CAd tool I developed, I did something in the exactly the same steps as you described.

Re: Traceboundary or...

norman.yuan — Thu, 01 Mar 2018 20:01:03 GMT

Oh, as for the perpendicular distance, you only need to find closed point on the each segment (between 2 vertices) to your point inside the polyline.

Re: Traceboundary or...

fieldguy — Sun, 04 Mar 2018 17:22:36 GMT

I ended up using rays. i got the start from >>here<<.

the layer idea with trace boundary works but for me messing with users layers is not the best method.

i created an objectid collection of the lines for checking and kept track of the length - i needed the closest. create a 2 vertex polyline and get the closest point for the perpendicular distance.

the ray part of the code is attached (requires transaction tr). thx @norman.yuan

Re: Traceboundary or...

ActivistInvestor — Sun, 04 Mar 2018 22:36:39 GMT

@fieldguy wrote:
I ended up using rays. i got the start from >>here<<.

the layer idea with trace boundary works but for me messing with users layers is not the best method.

i created an objectid collection of the lines for checking and kept track of the length - i needed the closest. create a 2 vertex polyline and get the closest point for the perpendicular distance.

the ray part of the code is attached (requires transaction tr). thx @norman.yuan

Sorry, but that doesn't make any sense.

If you already have the line, it is just a matter of calling GetClosestPointTo() to get the point on the line where it intersects a perpendicular line passing through the test point..

There are no rays needed.

Re: Traceboundary or...

fieldguy — Mon, 05 Mar 2018 02:19:42 GMT

>>If you already have the line<<

i do not. i have a point and 100s of lines to test.