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折线图如果只有一条数据的话程序会崩溃 #63

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@victorjiang-zz

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@victorjiang-zz

JHLineChart 折线图,如果只有一条数据,程序奔溃,在某些计算的方法中,如:
_perXLen = (_xLength-kXandYSpaceForSuperView)/(_xLineDataArr.count-1);

因为只有一条数据,_xLineDataArr.count = 1,所以分母为0,计算出_perXLen 为非法数值

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