MSChart(Microsoft Chart Controls)Thread Safe线程安全方式的实时图表

            minValue
=  DateTime
.Now;
            maxValue
= minValue.AddSeconds(30);
            chart1.ChartAreas[0].AxisX.Minimum =
minValue.ToOADate();
            chart1.ChartAreas[0].AxisX.Maximum =
maxValue.ToOADate();   //设置X轴为时间的范围
 
         public   void  AddNewPoint(  DateTime  timeStamp,
System.Windows.Forms.DataVisualization.Charting. Series  ptSeries
)
        {
             // Add new data point to its
series.
            ptSeries.Points.AddXY(
timeStamp.ToOADate(), rand.Next(10, 20));
             // remove all points from the source series older than 20
seconds.
             double  removeBefore = timeStamp.AddSeconds( ( double )(20) * ( -1
)).ToOADate();
             //remove oldest values to maintain a constant number of data
points
             while  ( ptSeries.Points[0].XValue < removeBefore
)
            {
                ptSeries.Points.RemoveAt(0);
            }
            chart1.ChartAreas[0].AxisX.Minimum =
ptSeries.Points[0].XValue;
            chart1.ChartAreas[0].AxisX.Maximum =  DateTime .FromOADate(ptSeries.Points[0].XValue).AddSeconds(30).ToOADate();
            chart1.Invalidate();
        }