static Vector2?PolygonClosestIntersection(Polygon2 poly, Vector2 startPoint, Vector2 endPoint)
{
float distance = 1000000000;
Vector2?result = null;
for (int i = 0; i < poly.points.Length; i++)
{
Vector2 pa = poly.points[i];
Vector2 pb = poly.points[(i + 1) % poly.points.Length];
pairA.A.x = startPoint.x;
pairA.A.y = startPoint.y;
pairA.B.x = endPoint.x;
pairA.B.y = endPoint.y;
pairB.A.x = pa.x;
pairB.A.y = pa.y;
pairB.B.x = pb.x;
pairB.B.y = pb.y;
Vector2?intersection = Math2D.GetPointLineIntersectLine2(pairA, pairB);
if (intersection != null)
{
float d = Vector2.Distance(intersection.Value, startPoint);
if (result != null)
{
if (d < distance)
{
result = intersection.Value;
d = distance;
}
}
else
{
result = intersection.Value;
distance = d;
}
}
}
return(result);
}