An implementation Bandlines introduced by Stephen Few.
Yong Lee Qizly
A line chart with a smooth-traveling tooltip. It's an up date on part 1 with a jumpy tooltip. The smoothness is achieved using HTML elements and using CSS Transition from one position to the next.
A line chart with tooltip based on Mike Bostock's X-Value Mouseover. Notice the tooltip is jumpy. Refer to part 2 for a smoother tooltip.