private void CreateGraph_FilteredPointList( ZedGraphControl z1 )
{
// Get a reference to the GraphPane
GraphPane myPane = z1.GraphPane;
// The data will have 10000 points, generated randomly
const int count = 100000;
Random rand = new Random();
// FilteredPointList stores the data as ordinary arrays
double[] x = new double[count];
double[] y = new double[count];
// Loop to calculate all the data values
for ( int i = 0; i < count; i++ )
{
// data are random
double val = rand.NextDouble();
double time = Math.Pow( (double) i, 1.5 ) / 1e6;
x[i] = time + 2.0;
y[i] = Math.Log( time * 1e6 ) * ( 1 + ( val - 0.5 ) * 0.1 );
}
// FilteredPointList requires that the data are monotonically increasing in X
// FilteredPointList stores its data internally as an ordinary array. The X, Y arrays
// below are saved as references (not copies).
FilteredPointList list = new FilteredPointList( x, y );
// Create a curve, and show only the symbols with no lines
LineItem myCurve = z1.GraphPane.AddCurve( "curve", list, Color.Blue, SymbolType.Diamond );
myCurve.Line.IsVisible = false;
// The IsApplyHighLowLogic property does not work properly. This option has been removed as
// of ZedGraph version 5.1.4. In the meantime, you should disable it as follows
//list.IsApplyHighLowLogic = false;
// Set the range of data of interest. In effect you can limit the plotted data to only a
// certain window within the total data range. In this case, I set the minimum and maximum
// bounds to include all data points. Also, all points are initially visible since the
// maxPts is set to a large value.
list.SetBounds( 2, 2.5, 5000 );
// Pretty it up
//myPane.Title.Text = "FilteredPointList Example\n100,000 Points Total, Filtered to 400 Points Visible";
myPane.Title.Text = "FilteredPointList Example\n100,000 Points Total, 2.5 seconds of data";
myPane.Title.FontSpec.Size = 18;
myPane.XAxis.Title.Text = "Time Span, seconds";
myPane.YAxis.Title.Text = "Signal Strength";
myPane.YAxis.Scale.Min = 0;
myPane.Legend.IsVisible = false;
myPane.Fill = new Fill( Color.WhiteSmoke, Color.Lavender, 0F );
myPane.Chart.Fill = new Fill( Color.FromArgb( 255, 255, 245 ),
Color.FromArgb( 255, 255, 190 ), 90F );
z1.IsAntiAlias = true;
z1.AxisChange();
}
