This is a demo of the Drawing API objects being used to make a bar chart all by themselves (without the actual Bar chart).
Is it quicker than using the standard Bar chart?
No.
Is it easier to implement than the standard Bar chart?
No.
Is it easier to maintain than the standard Bar chart?
No.
Does it encompass all of the features of the standard Bar chart?
No.
So why?
It's just an example of three of the drawing API objects - the XAxis, the Yaxis and the Rect. If what you want is a Bar
chart - use the RGraph Bar chart.