Multiple background color in pChart

How to fill the multiple color in the pChart background. For example at开发者_如何学JAVA the x-axis I want the background of 1-30 is red, 31-60 is blue and 61-90 is green(something like that) Is pChart has a function to do this kind of background or is it has some technique to do it.

Thank you in advance.

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You can use the drawThresholdArea() function to do so. See the doc here