Trendlines

13 Jun 202312 minutes to read

EjChart can generate Trendlines for Cartesian type series (Line, Column, Scatter, Area, Candle, HiLo etc.) except Bar type series. You can add more than one trendline object to the Trendlines option.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Enable Trendline to chart series
                        .Visibility("visible").Add();
                }).Add();
        })
         //...
     )

Click here to view the Trendlines online demo sample.

Customize the trendline styles

A trendline can be customized by using the properties such as Fill, Width, DashArray and Opacity. The default type of Trendline is Linear.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Customize the Trendline styles
                        .Fill("#99CCFF").Width(3).Opacity(1).DashArray("2,3").Add();
                }).Add();
        })
         //...
     )

Types of Trendline

EjChart supports the following type of Trendlines.

• Linear
• Exponential
• Logarithmic
• Power
• Polynomial
• MovingAverage

Linear

To render Linear Trendline, you have to set the Type as Linear.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Change Trendline type
                        .Type(TrendlineType.Linear).Add();
                }).Add();
        })
         //...
     )

Exponential

Exponential Trendline can be rendered by setting the Type as Exponential.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Change Trendline type
                        .Type(TrendlineType.Exponential).Add();
                }).Add();
        })
         //...
     )

Logarithmic

Logarithmic Trendline can be rendered by setting the Type as Logarithmic.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Change Trendline type
                        .Type(TrendlineType.Logarithmic).Add();
                }).Add();
        })
         //...
     )

Power

Power Trendline can be rendered by setting the Type of the trendline as Power.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Change Trendline type
                        .Type(TrendlineType.Power).Add();
                }).Add();
        })
         //...
     )

Polynomial

Polynomial Trendline can be rendered by setting the trendline Type as Polynomial. You can change the polynomial order by using the PolynomialOrder of the trendlines. It ranges from 2 to 6.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Change Trendline type
                        .Type(TrendlineType.Polynomial).Add();
                }).Add();
        })
         //...
     )

MovingAverage

MovingAverage Trendline can be rendered by setting the Type of the trendline as MovingAverage.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Change Trendline type
                        .Type(TrendlineType.MovingAverage).Add();
                }).Add();
        })
         //...
     )

Forecasting

Trendline forecasting is the prediction of future/past situations. Forecasting can be classified into two types as follows.

• Forward Forecasting
• Backward Forecasting

Forward Forecasting

The value set for ForwardForecast is used to determine the distance moving towards the future trend.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Set forward forecasting value
                        .ForwardForecast(5).Add();
                }).Add();
        })
         //...
     )

Backward Forecasting

The value set for the BackwardForecast is used to determine the past trends.

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Set backward forecasting value
                        .BackwardForecast(5).Add();
                }).Add();
        })
         //...
     )

Trendlines Legend

To display the legend item for trendline, use the Name property. You can interact with the trendline legends similar to the series legends (show/hide trendlines on legend click).

CSHTML

@(Html.EJ().Chart("chartContainer")
            //...

        .Series(sr =>
        {
            sr
                .Trendlines(trendline =>
                {
                    trendline
                        //Set Trendline name to display in the legend
                        .Name("Linear").Add();
                }).Add();
        })
         //...
     )