FluidInfo ILineFluidAffectable.GetFluidInfo(GetTangentCallback callback, Line line)
{
if (polygons.Length == 1)
{
return(ShapeHelper.GetFluidInfo(Vertexes, callback, line));
}
List <Vector2D[]> submerged = new List <Vector2D[]>(polygons.Length);
for (int index = 0; index < polygons.Length; ++index)
{
Vector2D[] vertexes = ShapeHelper.GetIntersection(polygons[index], line);
if (vertexes.Length >= 3)
{
submerged.Add(vertexes);
}
}
if (submerged.Count == 0)
{
return(null);
}
Vector2D[][] newPolygons = submerged.ToArray();
Vector2D centroid = MultiPolygonShape.GetCentroid(newPolygons);
Scalar area = MultiPolygonShape.GetArea(newPolygons);
Vector2D tangent = callback(centroid);
Vector2D dragCenter;
Scalar dragArea;
ShapeHelper.GetFluidInfo(newPolygons, tangent, out dragCenter, out dragArea);
return(new FluidInfo(dragCenter, dragArea, centroid, area));
}
