【zedgraph】Dual-Y Demo

 

// Call this method from the Form_Load method, passing your ZedGraphControl
public void CreateChart( ZedGraphControl zgc )
{
   GraphPane myPane = zgc.GraphPane;

   // Set the titles and axis labels
   myPane.Title.Text = "Demonstration of Dual Y Graph";
   myPane.XAxis.Title.Text = "Time, Days";
   myPane.YAxis.Title.Text = "Parameter A";
   myPane.Y2Axis.Title.Text = "Parameter B";
    
   // Make up some data points based on the Sine function
   PointPairList list = new PointPairList();
   PointPairList list2 = new PointPairList();
   for ( int i=0; i<36; i++ )
   {
      double x = (double) i * 5.0;
      double y = Math.Sin( (double) i * Math.PI / 15.0 ) * 16.0;
      double y2 = y * 13.5;
      list.Add( x, y );
      list2.Add( x, y2 );
   }
    
   // Generate a red curve with diamond symbols, and "Alpha" in the legend
   LineItem myCurve = myPane.AddCurve( "Alpha",
      list, Color.Red, SymbolType.Diamond );
   // Fill the symbols with white
   myCurve.Symbol.Fill = new Fill( Color.White );
    
   // Generate a blue curve with circle symbols, and "Beta" in the legend
   myCurve = myPane.AddCurve( "Beta",
      list2, Color.Blue, SymbolType.Circle );
   // Fill the symbols with white
   myCurve.Symbol.Fill = new Fill( Color.White );
   // Associate this curve with the Y2 axis
   myCurve.IsY2Axis = true;
    
   // Show the x axis grid
   myPane.XAxis.MajorGrid.IsVisible = true;
    
   // Make the Y axis scale red
   myPane.YAxis.Scale.FontSpec.FontColor = Color.Red;
   myPane.YAxis.Title.FontSpec.FontColor = Color.Red;
   // turn off the opposite tics so the Y tics don't show up on the Y2 axis
   myPane.YAxis.MajorTic.IsOpposite = false;
   myPane.YAxis.MinorTic.IsOpposite = false;
   // Don't display the Y zero line
   myPane.YAxis.MajorGrid.IsZeroLine = false;
   // Align the Y axis labels so they are flush to the axis
   myPane.YAxis.Scale.Align = AlignP.Inside;
   // Manually set the axis range
   myPane.YAxis.Scale.Min = -30;
   myPane.YAxis.Scale.Max = 30;
    
   // Enable the Y2 axis display
   myPane.Y2Axis.IsVisible = true;
   // Make the Y2 axis scale blue
   myPane.Y2Axis.Scale.FontSpec.FontColor = Color.Blue;
   myPane.Y2Axis.Title.FontSpec.FontColor = Color.Blue;
   // turn off the opposite tics so the Y2 tics don't show up on the Y axis
   myPane.Y2Axis.MajorTic.IsOpposite = false;
   myPane.Y2Axis.MinorTic.IsOpposite = false;
   // Display the Y2 axis grid lines
   myPane.Y2Axis.MajorGrid.IsVisible = true;
   // Align the Y2 axis labels so they are flush to the axis
   myPane.Y2Axis.Scale.Align = AlignP.Inside;
    
   // Fill the axis background with a gradient
   myPane.Chart.Fill = new Fill( Color.White, Color.LightGray, 45.0f );
    
   // Calculate the Axis Scale Ranges
   zgc.AxisChange();
}