Need equality of CPBarPlot.barOffset in CPScatterPlot

What is equality of CPBarPlot.barOffset in CPS开发者_运维知识库catterPlot ? So I can change the offset of my scatter plot.

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The barOffset is a CGFloat. It is the amount that the bars are offset from their true position given by the location coordinate. The units are a fraction of the barWidth property. For example:

barOffset = 0.5;   // moves the bars half a barWidth in the positive direction
barOffset = -0.25; // moves the bar a quarter of a barWidth in the negative direction