static public Point2d[] LineLine(Line2d lin1, Line2d lin2)
{
double s, t;
if (!LineLineParametric(lin1, lin2, out s, out t))
{
return(null);
}
return(new Point2d[] { lin1.PointAt(s) });
}
static public Point2d LineLineAsPoint(Line2d lin1, Line2d lin2)
{
double s, t;
if (!LineLineParametric(lin1, lin2, out s, out t))
{
return(null);
}
return(lin1.PointAt(s));
}
const double seg_maxparam = 1.0; //used as max limit for parameters beeing on a segment
#region PRIVATE_UTILS
/// <summary>
/// Converts an array of line parameters to an array of points, limited
/// by a minimum and maximum parameter. On emty result, null is returned,
/// otherwise a list of points along the line.
/// </summary>
private static Point2d[] LineParamsToPoints(double[] ts, Line2d l, double mint, double maxt)
{
if (ts == null)
{
return(null);
}
int n = ts.Length;
if (n <= 0)
{
return(null);
}
Point2d[] res = new Point2d[n];
int idx = 0;
for (int q = 0; q < n; q++)
{
double t = ts[q];
if (t >= mint && t <= maxt)
{
res[idx++] = l.PointAt(ts[q]);
}
}
if (idx == 0)
{
return(null); //all params out of range
}
if (idx != n)
{
Array.Resize(ref res, idx);
}
return(res);
}