Unable to get the user defined variables in JMETER through java

I am new to jmeter and I created a new column in agregate report for it. Now I need to place the values in it with some logic based on User Defined variables.

Now I wanted to know how to get these variable in StatGraphVisualizer.

This is the open source code. Please do the need full for solving this issue and you can get the code from here.

Please find the screen shots for it below.