一些可能用得上的

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ChartPanel:


public ChartEntity getEntityForPoint(int viewX,  int viewY)Returns the chart entity at a given point.This method will return null if there is (a) no entity at the given point, or (b) no entity collection has been generated.Parameters:viewX - the x-coordinate.viewY - the y-coordinate.Returns:The chart entity (possibly null).

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