MSChart(Microsoft Chart Controls)Timer方式的实时图表

         private   void  timerRealTimeData_Tick( object  sender, System.
EventArgs  e)
        {
             // Define some
variables
             int  numberOfPointsInChart =  int
.Parse(comboBoxVisiblePoints.Text);
             int  numberOfPointsAfterRemoval = numberOfPointsInChart -  int
.Parse(comboBoxPointsRemoved.Text);
             // Simulate adding new data
points
             int  numberOfPointsAddedMin = 5;
             int  numberOfPointsAddedMax = 10;
             for ( int  pointNumber = 0; pointNumber <
                random.Next(numberOfPointsAddedMin,
numberOfPointsAddedMax); pointNumber++)
            {
                chart1.Series[0].Points.AddXY(pointIndex +
1, random.Next(1000, 5000));
                ++pointIndex;
            }
             // Adjust Y & X axis
scale
            chart1.ResetAutoValues();
             if (chart1.ChartAreas[ "Default" ].AxisX.Maximum <
pointIndex)
            {
                chart1.ChartAreas[
"Default" ].AxisX.Maximum =
pointIndex;
            }
             // Keep a constant number of points by removing them from the
left
             while (chart1.Series[0].Points.Count >
numberOfPointsInChart)
            {
                 // Remove data points on the left
side
                 while (chart1.Series[0].Points.Count >
numberOfPointsAfterRemoval)
                {
                    chart1.Series[0].Points.RemoveAt(0);
                }
        
                 // Adjust X axis
scale
                chart1.ChartAreas[
"Default" ].AxisX.Minimum = pointIndex -
numberOfPointsAfterRemoval;
                chart1.ChartAreas[
"Default" ].AxisX.Maximum = chart1.ChartAreas[ "Default"
].AxisX.Minimum +
numberOfPointsInChart;
            }
             // Redraw
chart
            chart1.Invalidate();
        }