public static int ComputeHash(IAddon addon)
{
unchecked
{
var hash = -1;
hash = (hash * 397) ^ addon.GetTypeHashCode();
IList comp;
if (addon.GetPropertyValue("Components", out comp))
{
hash = (hash * 397) ^ comp.Count;
hash = comp.Cast <Item>().Aggregate(hash, (h, c) => (h * 397) ^ c.GetTypeHashCode());
hash = comp.Cast <Item>().Aggregate(hash, (h, c) => (h * 397) ^ c.ItemID);
}
return(hash);
}
}
public static MultiComponentList GetComponents(this IAddon addon)
{
if (addon == null)
{
return(null);
}
var hash = ComputeHash(addon);
var mcl = ComponentsCache.GetValue(hash);
if (mcl != null)
{
return(mcl);
}
mcl = new MultiComponentList(MultiComponentList.Empty);
int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
IList comp;
if (addon.GetPropertyValue("Components", out comp))
{
Point3D off;
foreach (var c in comp)
{
if (c.GetPropertyValue("Offset", out off))
{
x1 = Math.Min(off.X, x1);
y1 = Math.Min(off.Y, y1);
x2 = Math.Max(off.X, x2);
y2 = Math.Max(off.Y, y2);
}
}
}
mcl.Resize(1 + (x2 - x1), 1 + (y2 - y1));
if (comp != null)
{
Point3D off;
foreach (var c in comp.OfType <Item>())
{
if (c.GetPropertyValue("Offset", out off))
{
off = off.Clone3D(Math.Abs(x1), Math.Abs(y1));
mcl.Add(c.ItemID, off.X, off.Y, off.Z);
}
}
}
if (addon is Item)
{
((Item)addon).Delete();
}
return(ComponentsCache[hash] = mcl);
}
