/// <summary>
/// Get item that is interseted by ray comming through from point and to point.
/// </summary>
/// <param name="from">From point.</param>
/// <param name="to">To point.</param>
/// <param name="planes">The planes where intersection is searched.</param>
/// <param name="intersectionPoint">The intersection point.</param>
/// <returns>Intersected item.</returns>
private DiagramItem intersectedItem(Point from, Point to, Planes planes, out Point intersectionPoint)
{
if (planes == null)
{
intersectionPoint = default(Point);
return(null);
}
var item = planes.GetIntersectedItem(from, to, out intersectionPoint);
return(item);
}
/// <summary>
/// Selects according to ray direction defined by given points.
/// </summary>
/// <param name="p1">The p1.</param>
/// <param name="p2">The p2.</param>
/// <param name="incrementalPlanes">The incremental planes.</param>
/// <param name="decrementalPlanes">The decremental planes.</param>
/// <returns>Selected planes.</returns>
private Planes selectPlanes(double p1, double p2, Planes incrementalPlanes, Planes decrementalPlanes)
{
switch (Math.Sign(p2 - p1))
{
case 1:
return(incrementalPlanes);
case -1:
return(decrementalPlanes);
default:
return(null);
}
}