Steema Central

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

namespace TeeChartLabelProblemDemo
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private Steema.TeeChart.TChart tChart1;
		private DevExpress.XtraEditors.SimpleButton btnAddSeries;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private bool withNulls = true;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.tChart1 = new Steema.TeeChart.TChart();
			this.btnAddSeries = new DevExpress.XtraEditors.SimpleButton();
			this.SuspendLayout();
			// 
			// tChart1
			// 
			// 
			// tChart1.Header
			// 
			this.tChart1.Header.Lines = new string[] {
														 "TeeChart"};
			// 
			// tChart1.Legend
			// 
			// 
			// tChart1.Legend.Title
			// 
			// 
			// tChart1.Legend.Title.Font
			// 
			this.tChart1.Legend.Title.Font.Bold = true;
			// 
			// tChart1.Legend.Title.Pen
			// 
			this.tChart1.Legend.Title.Pen.Visible = false;
			this.tChart1.Location = new System.Drawing.Point(8, 8);
			this.tChart1.Name = "tChart1";
			this.tChart1.Size = new System.Drawing.Size(576, 576);
			this.tChart1.TabIndex = 0;
			// 
			// btnAddSeries
			// 
			this.btnAddSeries.Location = new System.Drawing.Point(640, 16);
			this.btnAddSeries.Name = "btnAddSeries";
			this.btnAddSeries.Size = new System.Drawing.Size(96, 32);
			this.btnAddSeries.TabIndex = 1;
			this.btnAddSeries.Text = "Add Series";
			this.btnAddSeries.Click += new System.EventHandler(this.btnAddSeries_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(888, 598);
			this.Controls.Add(this.btnAddSeries);
			this.Controls.Add(this.tChart1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private DataTable dt = null;
		private void InitDataSet() 
		{
			dt = new DataTable();
			AddLabelColumn(dt);
		}

		private void AddLabelColumn(DataTable table)
		{
			table.Columns.Add(new DataColumn("Label", System.Type.GetType("System.DateTime")));
		}

		private void AddColumn(DataTable table, string columnName) 
		{
			table.Columns.Add(new DataColumn(columnName, System.Type.GetType("System.Decimal")));
		}

		private void SetData(DataTable table) 
		{
			Random rnd = new Random();

			table.Rows.Clear();
			for(int i = 0; i < 50; i++) 
			{
				DataRow dr = table.NewRow();
				foreach(DataColumn dc in table.Columns) 
				{
					if(dc.DataType == System.Type.GetType("System.DateTime")) 
					{
						dr[dc] = DateTime.Now.AddDays(i);
					} 
					else if(dc.DataType == System.Type.GetType("System.Decimal")) 
					{
						
						if((i < 15 || i > 40) && withNulls)
						{
							dr[dc] = DBNull.Value; 
						} 
						else 
						{
							dr[dc] = Convert.ToDecimal(rnd.Next(10, 100));
						}
					}
				}
				table.Rows.Add(dr);
			}
		}

		private void btnAddSeries_Click(object sender, System.EventArgs e)
		{
			if(dt == null) 
			{
				InitDataSet();
			}
			if(dt.Columns.Count == 0) 
			{
				AddLabelColumn(dt);
			} 
			Steema.TeeChart.Styles.FastLine fl = new Steema.TeeChart.Styles.FastLine(tChart1.Chart);
			AddColumn(dt, fl.Title);
			SetData(dt);
			fl.DataSource = dt;

			fl.XValues.DataMember = "Label";
			fl.XValues.DateTime = true;
			
			fl.XValues.FillSequence();			
			fl.YValues.DataMember = fl.Title;
			
			fl.IgnoreNulls = false;

			fl.CheckDataSource(); 
			tChart1.Series.Add(fl);
			tChart1.Axes.Bottom.Labels.Style = Steema.TeeChart.AxisLabelStyle.Value;
		}
	}
}