Area chart (fill below) on CubicLineChart does not fill correctly

What steps will reproduce the problem?
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1. Create an area chart by setFillBelowLine(true) on a CubicLineChart

What is the expected output? What do you see instead?
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An area chart with a smooth line is expected. What appears is almost correct, 
but the last point on the line causes the fill to have a rounded edge, and not 
completely fill the area.

What version of the product binary library are you using?
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0.7.0

See attached screenshot

Original issue reported on code.google.com by mdpea...@gmail.com on 12 Aug 2011 at 3:18

Attachments:

[Screen Shot 2011-08-12 at 1.15.20 PM.png](https://storage.googleapis.com/google-code-attachments/achartengine/issue-118/comment-0/Screen Shot 2011-08-12 at 1.15.20 PM.png)

ibrahimsaputra / achartengine

Area chart (fill below) on CubicLineChart does not fill correctly #118