Steema Central

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Steema.TeeChart.WPF;
using Steema.TeeChart.WPF.Styles;
using Steema.TeeChart;

namespace TChartCustomAxisZoom
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
	public partial class Window1 : Window
	{
		Random rnd = new Random();
		TChart tChart;
		bool zoomed = false;
		private double MouseXDown, MouseYDown;
		FastLine fLine1 = new FastLine();
		FastLine fLine2 = new FastLine();
		FastLine fLine3 = new FastLine();

		public Window1()
		{
			InitializeComponent();
			InitializeChart();

		}
		Axis bottomAxis1, bottomAxis2, bottomAxis3;
		private void InitializeChart()
		{

			tChart = CreateChart();
			tChart.Zoomed += new EventHandler(tChart_Zoomed);
			tChart.UndoneZoom += new EventHandler(tChart_UndoneZoom);
			tChart.MouseDown += new MouseButtonEventHandler(tChart_MouseDown);
			fLine1.BeforeDrawValues += new PaintChartEventHandler(fLine1_BeforeDrawValues);
			fLine1.AfterDrawValues += new PaintChartEventHandler(fLine1_AfterDrawValues);

			fLine2.BeforeDrawValues += new PaintChartEventHandler(fLine1_BeforeDrawValues);
			fLine2.AfterDrawValues += new PaintChartEventHandler(fLine1_AfterDrawValues);
			fLine3.BeforeDrawValues += new PaintChartEventHandler(fLine1_BeforeDrawValues);
			fLine3.AfterDrawValues += new PaintChartEventHandler(fLine1_AfterDrawValues);

			tChart.Series.Add(fLine1);
			tChart.Series.Add(fLine2);
			tChart.Series.Add(fLine3);
			Axis bottomAxis = tChart.Axes.Bottom;
			bottomAxis1 = bottomAxis.Clone() as Axis;
			bottomAxis1.StartPosition = 0;
			bottomAxis1.EndPosition = 25;
			bottomAxis2 = bottomAxis.Clone() as Axis;
			bottomAxis2.StartPosition = 30;
			bottomAxis2.EndPosition = 55;
			bottomAxis3 = bottomAxis.Clone() as Axis;
			bottomAxis3.StartPosition = 60;
			bottomAxis3.EndPosition = 85;
			fLine1.CustomHorizAxis = bottomAxis1;
			fLine2.CustomHorizAxis = bottomAxis2;
			fLine3.CustomHorizAxis = bottomAxis3;


			FillRandomValues(fLine1);
			FillRandomValues(fLine2);
			FillRandomValues(fLine3);

			grid1.Children.Add(tChart);
		}

		void fLine1_AfterDrawValues(object sender, Steema.TeeChart.WPF.Drawing.Graphics3D g)
		{
			if (zoomed)
			{
				g.UnClip();
			}
		}

		void fLine1_BeforeDrawValues(object sender, Steema.TeeChart.WPF.Drawing.Graphics3D g)
		{
			if (zoomed)
			{
				Series s = sender as Series;
				double left = s.GetHorizAxis.IStartPos;
				double right = s.GetHorizAxis.IEndPos;
				double top = s.GetVertAxis.IStartPos;
				double bottom = s.GetVertAxis.IEndPos;
				g.ClipRectangle(left, top, right, bottom);
			}
		}

		void tChart_Zoomed(object sender, EventArgs e)
		{
			if (seriesArea != -1)
			{
				Axis axis = tChart.Series[seriesArea].GetHorizAxis;
				axis.Automatic = false;

				double min = axis.CalcPosPoint(tChart.Series[seriesArea].Chart.Zoom.x0);
				double max = axis.CalcPosPoint(tChart.Series[seriesArea].Chart.Zoom.x1);
				axis.SetMinMax(min, max);

				zoomed = true;
			}
		}
		private TChart CreateChart()
		{
			TChart tChart = new TChart();
			tChart.Aspect.View3D = false;
			tChart.Legend.Visible = false;
			tChart.Aspect.ClipPoints = false;
			tChart.Zoom.Allow = true;
			tChart.Zoom.Direction = ZoomDirections.Horizontal;
			return tChart;
		}
		private double[] FillRandomValues(FastLine fLine)
		{
			double[] randomValues = new double[100];
			for (int i = 0; i < 100; i++)
			{
				fLine.Add(rnd.NextDouble(), rnd.NextDouble());
			}
			return randomValues;
		}

		void tChart_UndoneZoom(object sender, EventArgs e)
		{
			zoomed = false;
			for (int i = 0; i < tChart.Series.Count; i++)
			{
				tChart[i].CustomHorizAxis.Automatic = true;
			}
		}

		int seriesArea;

		private int GetSeriesArea(Point p)
		{
			if (p.X > bottomAxis1.IStartPos && p.X < bottomAxis1.IEndPos)
			{
				return 0;
			}
			else if (p.X > bottomAxis2.IStartPos && p.X < bottomAxis2.IEndPos)
			{
				return 1;
			}
			else if (p.X > bottomAxis3.IStartPos && p.X < bottomAxis3.IEndPos)
			{
				return 2;
			}
			else
			{
				return -1;
			}
		}


		void tChart_MouseDown(object sender, MouseButtonEventArgs e)
		{
			Point p = e.GetPosition(tChart);
			MouseXDown = p.X;
			MouseYDown = p.Y;

			seriesArea = GetSeriesArea(p);
		}
	}
}