func (n *BasicNode) Color() Color {
	return n.color
}
Color returns the node Color.
package rquad
import "image"
type BasicNode struct {
	parent   Node             
	c        [4]Node          
	bounds   image.Rectangle  
	color    Color            
	location Quadrant         
}
func (n *BasicNode) Parent() Node {
	if n.parent == nil {
		return nil
	}
	return n.parent
}
func (n *BasicNode) Child(q Quadrant) Node {
	if n.c[q] == nil {
		return nil
	}
	return n.c[q]
}
func (n *BasicNode) Bounds() image.Rectangle {
	return n.bounds
}