Trendlines

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.

  • ts
  • this.ChartTrendlines= [{
         //Enable Trendline to chart series
         visibility: "visible", type: "linear"
       }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Trendlines Visibility

    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”.

  • ts
  • this.ChartTrendlines = [{
        //...
        //Customize the Trendline styles
        fill: '#99CCFF', width: 3, opacity: 1, dashArray: '2,3'
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Trendline Customization

    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”.

  • ts
  • this.ChartTrendlines = [{
        //Change Trendline type
        type: "linear"
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Linear Trendline

    Exponential

    Exponential Trendline can be rendered by setting the type as “exponential”.

  • ts
  • this.ChartTrendlines = [{
        //Change Trendline type
        type: "exponential"
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Exponential Trendline

    Logarithmic

    Logarithmic Trendline can be rendered by setting the type as “Logarithmic”.

  • ts
  • this.ChartTrendlines = [{
        //Change Trendline type
        type: "logarithmic"
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Logarithmic Trendline

    Power

    Power Trendline can be rendered by setting the type of the trendline as “power”.

  • ts
  • this.ChartTrendlines = [{
        //Change Trendline type
        type: "power"
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Power Trendline

    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.

  • ts
  • this.ChartTrendlines = [{
        //Change Trendline type
        type: "polynomial"
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Polynomial Trendline

    MovingAverage

    MovingAverage Trendline can be rendered by setting the type of the trendline as “movingAverage”.

  • ts
  • this.ChartTrendlines = [{
        //Change Trendline type and set period for moving average
        type: "movingAverage", period: 3
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Moving Average Trendline

    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.

  • ts
  • this.ChartTrendlines = [{
        //...
        //Set forward forecasting value
        forwardForecast: 5
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Forward Forecast

    Backward Forecasting

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

  • ts
  • this.ChartTrendlines = [{
        //...
        //Set forward forecasting value
        backwardForecast: 5
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Backward Forecast

    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).

  • ts
  • this.ChartTrendlines = [{
        //...
        //Set Trendline name to display in the legend
        name: 'Linear'
    }];
  • html
  • <ej-chart id="chartcontainer">
        <e-seriescollection>
            <e-series [trendlines]="ChartTrendlines"> 		
    		</e-series>		
        </e-seriescollection>
    </ej-chart>

    Trendline Legend