IntervalOffset Property

StripLine.IntervalOffset Property

.NET Framework 4.6 and 4.5

Gets or sets the offset of grid lines, tick marks, strip lines and axis labels.

Namespace:   System.Web.UI.DataVisualization.Charting
Assembly:  System.Web.DataVisualization (in System.Web.DataVisualization.dll)

public double IntervalOffset { get; set; }

Property Value

Type: System.Double

A double value that represents the interval offset.

The interval offset of minor tick marks and grid lines is never affected by the value of the IntervalOffset property of the Axis object.

The IntervalOffset property setting defines the units of measurement of the offset.

The Interval can be a negative value.

The default value is Auto (0).

The following code example demonstrates three applications of strip lines. First, horizontal strip lines are added at recurring intervals. Second, vertical strip lines are added to highlight weekend data points. Lastly, a non-recurring strip line is added to denote the mean of the data points in the first series of the chart.

public partial class StripLines : System.Web.UI.Page 
        protected void Page_Load(object sender, EventArgs e)
            // Add chart data

            // Adds repeating horizontal strip lines.

            // Highlights weekend points using strip lines.

            // Adds a threshold line using strip lines.

        /// <summary>
        /// Adds a week of data with values between 20 and 35.
        /// </summary>
        private void AddChartData()
            // Declare new random variable
            Random rand = new Random();

            // Add a week of data
            for (int i = 0; i < 7; i++) 
                chart1.Series[0].Points.AddXY(DateTime.Now.AddDays(i), rand.Next(20,35));

        /// <summary>
        /// Adds repeating horizontal strip lines at intervals of 5.
        /// </summary>
        private void AddHorizRepeatingStripLines()
            // Instantiate new strip line
            StripLine stripLine1 = new StripLine();
            stripLine1.StripWidth = 0;
            stripLine1.BorderColor = Color.Black;
            stripLine1.BorderWidth = 3;
            stripLine1.Interval = 5;

            // Consider adding transparency so that the strip lines are lighter
            stripLine1.BackColor = Color.FromArgb(120, Color.Red);

            stripLine1.BackSecondaryColor = Color.Black;
            stripLine1.BackGradientStyle = GradientStyle.LeftRight;

            // Add the strip line to the chart

        /// <summary>
        /// Adds strip lines to highlight weekend values.
        /// </summary>
        private void HighlightWeekendsWithStripLines()
            // Set strip line to highlight weekends
            StripLine stripLine2 = new StripLine();
            stripLine2.BackColor = Color.FromArgb(120, Color.Gold);            
            stripLine2.IntervalOffset = -1.5;
            stripLine2.IntervalOffsetType = DateTimeIntervalType.Days;
            stripLine2.Interval = 1;
            stripLine2.IntervalType = DateTimeIntervalType.Weeks;
            stripLine2.StripWidth = 2;
            stripLine2.StripWidthType = DateTimeIntervalType.Days;

            // Add strip line to the chart

            // Set the axis label to show the name of the day
            // This is done in order to demonstrate that weekends are highlighted
            chart1.ChartAreas[0].AxisX.LabelStyle.Format = "ddd";

        /// <summary>
        /// Adds a horizontal threshold strip line at the calculated mean 
        /// value of all data points in the first series of the chart.
        /// </summary>
        private void AddThresholdStripLine()
            StripLine stripLine3 = new StripLine();

            // Set threshold line so that it is only shown once
            stripLine3.Interval = 0;

            // Set the threshold line to be drawn at the calculated mean of the first series
            stripLine3.IntervalOffset = chart1.DataManipulator.Statistics.Mean(chart1.Series[0].Name);

            stripLine3.BackColor = Color.DarkGreen;
            stripLine3.StripWidth = 0.25;

            // Set text properties for the threshold line
            stripLine3.Text = "Mean";
            stripLine3.ForeColor = Color.Black;

            // Add strip line to the chart

.NET Framework
Available since 4.0
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