//----------------------------------------------------------------------------------------------------------------
// - Isometric Buffer Node Constructor
//----------------------------------------------------------------------------------------------------------------
public IsometricBufferNode(IsometricObject target, IsometricBuffer container)
{
Target = target;
// Add events to target to dispose this node when the target is disposed, and alert this node of any changes
// in position
if (Target != null)
{
Target.Disposed += (s, e) => { Dispose(); };
Target.PositionChanged += (s, e) => { Alert(); };
}
Container = container;
// New nodes immediately signal a re-sort call
if (Target != null && Container != null)
{
Alert();
}
}
//----------------------------------------------------------------------------------------------------------------
// - Compare Painter's Order Of Target Objects
//----------------------------------------------------------------------------------------------------------------
private bool Compare(IsometricObject a, IsometricObject b)
{
if (a != null && b != null)
{
// If A.Z is above B.Z + B.Height relative to A, then A is on top
if (a.Position.Z >= b.Position.Z + b.Height(new Vector2f(a.Position.X - b.Position.X, a.Position.Y - b.Position.Y)))
{
return(true);
}
// Else, if A.Z + A.Height relative to B is lower than B.Z, B is on top
else if (b.Position.Z >= a.Position.Z + a.Height(new Vector2f(a.Position.X - b.Position.X, a.Position.Y - b.Position.Y)))
{
return(false);
}
// If neither, then compare isometric X+Y (closeness) relationship ...
else
{
return(a.Position.X + a.Position.Y >= b.Position.X + b.Position.Y);
}
}
return(false);
}
//--------------------------------------------------------------------------------------------------------------------
// - Remove Object From Buffer
//--------------------------------------------------------------------------------------------------------------------
public void Remove(IsometricObject obj)
{
IsometricBufferNode node = Nodes.FirstOrDefault(n => n.Target == obj);
node?.Dispose();
}
//--------------------------------------------------------------------------------------------------------------------
// - Add New Object To Buffer
//--------------------------------------------------------------------------------------------------------------------
public void Add(IsometricObject obj)
{
// Will signal this buffer to re-sort by setting Dirty
Nodes.Add(new IsometricBufferNode(obj, this));
}