Trendlines in ASP.NET Core Chart

7 Jul 20227 minutes to read

Chart can generate trendlines for Cartesian type series such as line, column, scatter, area, candle, HiLo, etc., except bar type series. You can add more than one trendline object to the Trendlines option.

CSHTML

<ej-chart id="chartContainer">
// ...
<e-chart-series>
    <e-series>
        <e-trend-lines>
            <e-trend-line visibility="Visible"></e-trend-line>
        </e-trend-lines>
    </e-series>
</e-chart-series>
// ...
</ej-chart>

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

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line fill="#99CCFF" width="3" opacity="1" dash-array="2,3"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Types of trendline

Chart supports the following types of Trendline:

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

Linear

To render linear trendline, set the type to Linear.

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line type="Linear"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Exponential

Exponential trendline can be rendered by setting the type to Exponential.

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line type="Exponential"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Logarithmic

Logarithmic trendline can be rendered by setting the type to Logarithmic.

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line type="Logarithmic"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Power

Power trendline can be rendered by setting the type to Power.

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line type="Power"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Polynomial

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

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line type="Polynomial"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

MovingAverage

Moving average trendline can be rendered by setting the type to MovingAverage.

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line type="MovingAverage"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Forecasting

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

• Forward Forecasting
• Backward Forecasting

Forward forecasting

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

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line forward-forecast="5"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

Backward forecasting

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

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line backward-forecast="5"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>

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, i.e. show/hide trendlines on legend click.

CSHTML

<ej-chart id="chartContainer">
    // ...
    <e-chart-series>
        <e-series>
            <e-trend-lines>
                <e-trend-line name="Linear"></e-trend-line>
            </e-trend-lines>
        </e-series>
    </e-chart-series>
    // ...
</ej-chart>