protected override void ApplyDrawNode(DrawNode node)
{
ContainerDrawNode n = node as ContainerDrawNode;
n.MaskingRect = Masking ? ScreenSpaceDrawQuad.AABB : (Rectangle?)null;
base.ApplyDrawNode(node);
}
internal override DrawNode GenerateDrawNodeSubtree(DrawNode node = null)
{
ContainerDrawNode cNode = base.GenerateDrawNodeSubtree(node) as ContainerDrawNode;
if (children.AliveItems.Count > 0)
{
if (cNode.Children != null)
{
var current = children.AliveItems;
var target = cNode.Children;
int j = 0;
for (int i = 0; i < current.Count; i++)
{
if (!current[i].IsVisible)
{
continue;
}
//todo: make this more efficient.
if (Game?.ScreenSpaceDrawQuad.FastIntersects(current[i].ScreenSpaceDrawQuad) == false)
{
continue;
}
if (j < target.Count && target[j].Drawable == current[i])
{
current[i].GenerateDrawNodeSubtree(target[j]);
}
else
{
if (j < target.Count)
{
target.RemoveAt(j);
}
target.Insert(j, current[i].GenerateDrawNodeSubtree());
}
j++;
}
if (j < target.Count)
{
target.RemoveRange(j, target.Count - j);
}
}
else
{
cNode.Children = new List <DrawNode>(children.AliveItems.Count);
foreach (Drawable child in children.AliveItems)
{
//if (Game?.ScreenSpaceDrawQuad.Intersects(child.ScreenSpaceDrawQuad) == false)
// continue;
if (!child.IsVisible)
{
continue;
}
cNode.Children.Add(child.GenerateDrawNodeSubtree());
}
}
}
else
{
cNode.Children?.Clear();
}
return(cNode);
}