public static void MoveItemToTop <T>(this FastObservableCollection <T> collection, T item)
{
using (collection.SuspendChangeNotifications())
{
collection.Remove(item);
collection.Insert(0, item);
}
}
//A More exact Mouse In PolygonCheck
public static bool MouseIsInPolygon(FastObservableCollection<INode> poly, PolyPoint point)
{
Vector3 vecPoint = new Vector3(point.X, point.Y,0);
var tempList = new FastObservableCollection<INode>();
foreach (var node in poly)
{
tempList.Add(node);
}
//Copy the list so we can add the last two verts into the start so we can get a full circle check easy.
tempList.Insert(0,tempList[tempList.Count-2]);
tempList.Insert(0,tempList[tempList.Count-1]);
for (int i = 1; i < tempList.Count - 2; i++)
{
//we'll feed 3 verts at a time to PointInTriangle to see if it returns true or not. If one time returns true then we can stop calculating
Vector3 A = new Vector3((tempList[0] as PolyPoint).X, (tempList[0] as PolyPoint).Y ,0);
Vector3 B = new Vector3((tempList[i + 1] as PolyPoint).X, (tempList[i + 1] as PolyPoint).Y,0);
Vector3 C = new Vector3((tempList[i + 2] as PolyPoint).X, (tempList[i + 2] as PolyPoint).Y,0);
if (PointInTriangle(ref A, ref B, ref C, ref vecPoint))
{
return true;
}
}
return false;
}
