get vertices for an edge query?

adamohern

My feature queries for an edge, and I need to know the locations of its endpoints. How do I do that?

(Apologies for the noob question, but I've been digging for twenty minutes and can't find it.)

jacob_kingery

Something like this should work, though there may be a better way.

const endpoints = qVertexAdjacent(edgeQuery, EntityType.VERTEX);
for (var vertex in evaluateQuery(context, endpoints))
{
    const point = evVertexPoint(context, {
        "vertex" : vertex
    });
    println(point);
}

The qVertexAdjacent() gets the vertices of the edge and calling evVertexPoint() on each gives you their coordinates.

ilya_baran

Another option if you, for example, know you have an edge with two endpoints is:

var lines = evEdgeTangentLines(context, { "edge" : edgeQuery, "parameters" : [0, 1] });
println(lines[0].origin);
println(lines[1].origin);

adamohern

Ah, both great options. Thanks, guys!