/// <summary>
/// Calculate the intersection points when a line across many segments.
/// </summary>
/// <param name="sEqs">The segment equations.</param>
/// <param name="lEq">The line equation.</param>
/// <returns>Returns the intersection points.</returns>
public static List <Point> GetIntersection(IEnumerable <SegmentEquation> sEqs, LinearEquation lEq)
{
var pts = new List <Point>();
foreach (var sEq in sEqs)
{
var pt = SegmentEquation.GetIntersection(sEq, lEq);
if (null != pt && sEq.IsPointInRange(pt))
{
pts.Add(pt);
}
}
return(pts);
}
/// <summary>
/// Calculate the intersection point between the segment and line (Special).
/// </summary>
/// <param name="sEq">The segment equation.</param>
/// <param name="lEq">The line equation.</param>
/// <returns>Returns the intersection points.</returns>
public static Point GetIntersectionSp(SegmentEquation sEq, LinearEquation lEq)
{
var pt = SegmentEquation.GetIntersection(sEq, lEq);
if (pt == sEq.endpoint1)
{
if (pt.Y <= sEq.endpoint2.Y)
{
pt = null;
}
}
else if (pt == sEq.endpoint2)
{
if (pt.Y <= sEq.endpoint1.Y)
{
pt = null;
}
}
return(pt);
}
