AStarCollisionMap.QuadTree.Quad.Draw C# (CSharp) Method

        internal void Draw(SpriteBatch sb)
        {
            // If it ain't on the screen
            if (!tree.collisionMap.windowSize.Intersects( this.GetDrawRectangle() ) ) return;

            if (this.children == null)
            {
                // Draw the texture
                sb.Draw(this.collisionTexture.texture, this.GetDrawRectangle(), null, this.tree.drawColor, 0f,
                    Vector2.Zero, SpriteEffects.None, 0.999999f);
                // Draw the rectangle bounds
                if( this.tree.drawGridLines )
                    DrawUtil.DrawClearRectangle(sb, this.GetDrawRectangle(), this.tree.borderWidth, this.tree.borderColor);

                // Draw the ????
                if (this.highlighted)
                {
                    DrawUtil.DrawLine(sb,
                        new Point(this.rectangle.Left, this.rectangle.Top),
                        new Point(this.rectangle.Right, this.rectangle.Bottom),
                        this.tree.highlightedColor,
                        this.tree.borderWidth);
                    DrawUtil.DrawLine(sb,
                        new Point(this.rectangle.Right, this.rectangle.Top),
                        new Point(this.rectangle.Left, this.rectangle.Bottom),
                        this.tree.highlightedColor,
                        this.tree.borderWidth);
                }
                return;
            }
            foreach (Quad quad in children)
            {
                quad.Draw(sb);
            }
        }