/// <summary>
/// Combines two drawables into one group. Sets the group for both
/// </summary>
/// <param name="left">Left drawable of edge</param>
/// <param name="right">Right drawable of edge</param>
public void CombineIntoGroup(IDrawable left, IDrawable right)
{
// If drawable is already in group, use that group
if (right is MetaNoun)
{
right.CombineIntoGroup(left);
left.Group = (MetaNoun)right;
return;
}
IDrawableGroup group = null;
//Create new group
if (left.Group == null && right.Group == null)
{
group = new MetaNoun(left, right);
}
// Use drawable group
else if (left.Group == null)
{
group = right.Group;
group.CombineIntoGroup(left);
}
// Use this group
else
{
group = left.Group;
var oldGroup = right.Group;
group.CombineIntoGroup(right);
right.Group.Dispose();
}
// Set to both same group
left.Group = group;
right.Group = group;
}