背景

ZedGraph控件中有多Y轴时，Y轴刻度值的小数位数和数值范围会影响各Y轴之间的间隔，因此为了保证让各Y轴之间的间距相等，且刻度值美观，最好对刻度值进行格式化。如下图：


要想格式化Y轴刻度值，需要在创建Y轴坐标时订阅事件ScaleFormatEvent
创建Y轴的参考代码

/// <summary>
/// 统一设置新生成的Y轴的样式
/// </summary>
/// <param name="myPane">pane对象</param>
/// <param name="yAxis">Y轴对象</param>
/// <param name="yAxisModel">Y轴样式信息</param>
/// <returns></returns>
public static GraphPane SetNewYAxisStyle(GraphPane myPane, YAxis yAxis, YAxisModel yAxisModel)
{yAxis = SetYAxisStyle(yAxis, yAxisModel);yAxis.ScaleFormatEvent -= yAxis_ScaleFormatEvent;yAxis.ScaleFormatEvent += yAxis_ScaleFormatEvent;myPane.YAxisList.Add(yAxis);            //添加到Y轴的listreturn myPane;
}

ScaleFormatEvent事件处理代码如下

/// <summary>
/// Y轴坐标数据格式化
/// </summary>
/// <param name="pane"></param>
/// <param name="axis"></param>
/// <param name="val"></param>
/// <param name="index"></param>
/// <returns></returns>
private static string yAxis_ScaleFormatEvent(GraphPane pane, Axis axis, double val, int index)
{int maxLabelLen = 10;			//Y轴刻度值占位符个数string strValue = Wongoing.Basic.DataProcessor.FormatFloatValue(val, 3).ToString();		//最多保留3为小数if (strValue.Length > maxLabelLen){return strValue.Substring(0, maxLabelLen);}if (strValue.Length < maxLabelLen){return Wongoing.Basic.DataProcessor.FillSpace(strValue, maxLabelLen);}return strValue;
}