[英]How to get date time from PointPair in X axis using ZedGraph in C#?
我能够使图形X轴以DateTime格式显示,但是当鼠标指向曲线项时,我无法获取日期时间,PointPair仅返回两倍的数据。 我如何获得日期?
myPane.XAxis.Type = AxisType.Date;
myPane.XAxis.Scale.Min = new XDate(DateTime.Now); // We want to use time from now
myPane.XAxis.Scale.Max = new XDate(DateTime.Now.AddMinutes(5)); // to 5 minutes per default
myPane.XAxis.Scale.MinorUnit = DateUnit.Second; // set the minimum x unit to time/seconds
myPane.XAxis.Scale.MajorUnit = DateUnit.Minute; // set the maximum x unit to time/minutes
myPane.XAxis.Scale.Format = "T";
下面是功能
private string MyPointValueHandler(ZedGraphControl control, GraphPane pane, CurveItem curve, int iPt)
{
// Get the PointPair that is under the mouse
PointPair pt = curve[iPt];
if( curve.Label.Text == "Temperature" )
return curve.Label.Text + " is " + pt.Y.ToString("f2") + " ºC at " + pt.X.ToString("f2");
else
return curve.Label.Text + " is " + pt.Y.ToString("f2") + " % at " + pt.X.ToString("f2");
}
我想要这样的结果,例如:下午4:20:12温度为23ºC
PointPair pt = curve[iPt];
XDate the_date = new XDate(pt.X);
if( curve.Label.Text == "Temperature" )
return curve.Label.Text + " is " + pt.Y.ToString("f2") + " ºC at " + the_date.DateTime;
else
return curve.Label.Text + " is " + pt.Y.ToString("f2") + " % at " + the_date.DateTime;
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