ProjectsForTest/WinForm.NET5TeeChart-NET-Pro-Samples/Series/Line_Interpolate.cs

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using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace Steema.TeeChart.Samples
{
	public class Line_Interpolate : Steema.TeeChart.Samples.BaseForm
	{
    private Steema.TeeChart.Styles.Line line1;
    private Steema.TeeChart.Styles.Line line2;
    private Steema.TeeChart.Styles.Line line3;
    private Steema.TeeChart.Tools.CursorTool cursorTool1;
    private System.Windows.Forms.CheckBox checkBox1;
		private System.ComponentModel.IContainer components = null;
		private Steema.TeeChart.Tools.GridBand gridBand1;
    private double xval;

    /// <summary>
    /// Calculate y=y(x) for arbitrary x. Works fine only for line series with ordered x values.
    /// </summary>
    /// <param name="series"></param>
    /// <param name="firstindex"></param>
    /// <param name="lastindex"></param>
    /// <param name="xvalue"></param>
    /// <returns>y=y(xvalue) where xvalue is arbitrary x value.</returns>
    private double InterpolateLineSeries(TeeChart.Styles.Custom series, int firstindex, int lastindex, double xvalue)
    {
      int index;
      for (index=firstindex; index<=lastindex; index++)
      {
        if (index == -1 || series.XValues.Value[index]>xvalue) break;
      }
      // safeguard
      if (index<1) index = 1;
      else if (index>=series.Count) index = series.Count -1;
      // y=(y2-y1)/(x2-x1)*(x-x1)+y1
      double dx = series.XValues[index] - series.XValues[index-1];
      double dy = series.YValues[index] - series.YValues[index-1];
      if (dx!=0.0) return dy*(xvalue - series.XValues[index-1])/dx + series.YValues[index-1];
      else return 0.0;
    }

    private double InterpolateLineSeries(TeeChart.Styles.Custom series,double xvalue)
    {
      return InterpolateLineSeries(series,series.FirstVisibleIndex,series.LastVisibleIndex,xvalue);
    }

		public Line_Interpolate()
		{
			// This call is required by the Windows Form Designer.
			InitializeComponent();

			foreach (TeeChart.Styles.Series s in tChart1.Series)
        s.FillSampleValues(20);
		}

		/// <summary>
		/// Clean up any resources being used.