VEXpression

Extract Edge Groups

string edgegrp = chs('edge_group');
string newgrpname = chs('new_polyline_group_name');

int edges[] = expandedgegroup(0, edgegrp);

int prevpt = -1;
int curprim = -1;

for(int i=0; i<len(edges); i+=2)
{
    if(edges[i] == prevpt)
    {
        addvertex(0, curprim, edges[i+1]);
        prevpt = edges[i+1];
    }
    else if(edges[i+1] == prevpt)
    {
        addvertex(0, curprim, edges[i]);
        prevpt = edges[i];
    }
    else
    {
        if(edges[i] == edges[i+2] || edges[i] == edges[i+3])
        {
            curprim = addprim(0, 'polyline', edges[i+1], edges[i]);
            prevpt = edges[i];
        }
        else
        {
            curprim = addprim(0, 'polyline', edges[i], edges[i+1]);
            prevpt = edges[i+1];
        }
        setprimgroup(0, newgrpname, curprim, 1);
    }
}