Trendlines in Blazor Stock Chart Component

4 Nov 202519 minutes to read

Trendlines illustrate the direction and speed of price movement. The Stock Chart supports six trendline types: Linear, Exponential, Logarithmic, Polynomial, Power, and Moving Average. Using the trendline dropdown button, the required trendline type can be added or removed.

Linear

A linear trendline is a best‑fit straight line used with simpler data sets. To render a linear trendline, set the trendline Type to Linear.

@using Syncfusion.Blazor.Charts

<SfStockChart Title="AAPL Stock Price" SeriesType="@SeriesType" IndicatorType="@Indicator" ExportType="@ExportType">
    <StockChartPrimaryXAxis>
        <StockChartAxisMajorGridLines Color="Transparent"></StockChartAxisMajorGridLines>
    </StockChartPrimaryXAxis>
    <StockChartPrimaryYAxis>
        <StockChartAxisLineStyle Color="Transparent"></StockChartAxisLineStyle>
        <StockChartAxisMajorTickLines Color="Transparent" Width="0"></StockChartAxisMajorTickLines>
    </StockChartPrimaryYAxis>
    <StockChartSeriesCollection>
        <StockChartSeries DataSource="@StockDetails" Type="ChartSeriesType.Candle" XName="Date" High="High" Low="Low" Open="Open" Close="Close" Volume="Volume" Name="Google">
            <StockChartTrendlines>
                <StockChartTrendline Type="TrendlineTypes.Linear" EnableTooltip="false"></StockChartTrendline>
            </StockChartTrendlines>
        </StockChartSeries>
    </StockChartSeriesCollection>
</SfStockChart>

@code {
    public List<TechnicalIndicators> Indicator = new List<TechnicalIndicators>();
    public List<ChartSeriesType> SeriesType = new List<ChartSeriesType>();
    public List<ExportType> ExportType = new List<ExportType>();

    public class StockChartData
    {
        public DateTime Date { get; set; }
        public Double Open { get; set; }
        public Double Low { get; set; }
        public Double Close { get; set; }
        public Double High { get; set; }
        public Double Volume { get; set; }
    }

    public List<StockChartData> StockDetails = new List<StockChartData>
    {
        new StockChartData { Date = new DateTime(2012, 04, 02), Open = 85.9757, High = 90.6657, Low = 85.7685, Close = 90.5257, Volume = 660187068 },
        new StockChartData { Date = new DateTime(2012, 04, 09), Open = 89.4471, High = 92, Low = 86.2157, Close = 86.4614, Volume = 912634864 },
        new StockChartData { Date = new DateTime(2012, 04, 16), Open = 87.1514, High = 88.6071, Low = 81.4885, Close = 81.8543, Volume = 1221746066 },
        new StockChartData { Date = new DateTime(2012, 04, 23), Open = 81.5157, High = 88.2857, Low = 79.2857, Close = 86.1428, Volume = 965935749 },
        new StockChartData { Date = new DateTime(2012, 04, 30), Open = 85.4, High = 85.4857, Low = 80.7385, Close = 80.75, Volume = 615249365 },
        new StockChartData { Date = new DateTime(2012, 05, 07), Open = 80.2143, High = 82.2685, Low = 79.8185, Close = 80.9585, Volume = 541742692 },
        new StockChartData { Date = new DateTime(2012, 05, 14), Open = 80.3671, High = 81.0728, Low = 74.5971, Close = 75.7685, Volume = 708126233 },
        new StockChartData { Date = new DateTime(2012, 05, 21), Open = 76.3571, High = 82.3571, Low = 76.2928, Close = 80.3271, Volume = 682076215 },
        new StockChartData { Date = new DateTime(2012, 05, 28), Open = 81.5571, High = 83.0714, Low = 80.0743, Close = 80.1414, Volume = 480059584 }
     };
}

Blazor Stock Chart with Linear Trendline

Logarithmic

A logarithmic trendline is a best fit curved line that is most useful when the rate of change in the data increases or decreases quickly and then levels out. A logarithmic trendline can use negative and positive values.

To render a logarithmic trendline, set the trendline Type to Logarithmic.

@using Syncfusion.Blazor.Charts

<SfStockChart Title="AAPL Stock Price" SeriesType="@SeriesType" IndicatorType="@Indicator" ExportType="@ExportType">
    <StockChartPrimaryXAxis>
        <StockChartAxisMajorGridLines Color="Transparent"></StockChartAxisMajorGridLines>
    </StockChartPrimaryXAxis>
    <StockChartPrimaryYAxis>
        <StockChartAxisLineStyle Color="Transparent"></StockChartAxisLineStyle>
        <StockChartAxisMajorTickLines Color="Transparent" Width="0"></StockChartAxisMajorTickLines>
    </StockChartPrimaryYAxis>
    <StockChartSeriesCollection>
        <StockChartSeries DataSource="@StockDetails" Type="ChartSeriesType.Candle" XName="Date" High="High" Low="Low" Open="Open" Close="Close" Volume="Volume" Name="Google">
            <StockChartTrendlines>
                <StockChartTrendline Type="TrendlineTypes.Logarithmic" EnableTooltip="false"></StockChartTrendline>
            </StockChartTrendlines>
        </StockChartSeries>
    </StockChartSeriesCollection>
</SfStockChart>

@code {
    public List<TechnicalIndicators> Indicator = new List<TechnicalIndicators>();
    public List<ChartSeriesType> SeriesType = new List<ChartSeriesType>();
    public List<ExportType> ExportType = new List<ExportType>();

    public class StockChartData
    {
        public DateTime Date { get; set; }
        public Double Open { get; set; }
        public Double Low { get; set; }
        public Double Close { get; set; }
        public Double High { get; set; }
        public Double Volume { get; set; }
    }

    public List<StockChartData> StockDetails = new List<StockChartData>
    {
        new StockChartData { Date = new DateTime(2012, 04, 02), Open = 85.9757, High = 90.6657, Low = 85.7685, Close = 90.5257, Volume = 660187068 },
        new StockChartData { Date = new DateTime(2012, 04, 09), Open = 89.4471, High = 92, Low = 86.2157, Close = 86.4614, Volume = 912634864 },
        new StockChartData { Date = new DateTime(2012, 04, 16), Open = 87.1514, High = 88.6071, Low = 81.4885, Close = 81.8543, Volume = 1221746066 },
        new StockChartData { Date = new DateTime(2012, 04, 23), Open = 81.5157, High = 88.2857, Low = 79.2857, Close = 86.1428, Volume = 965935749 },
        new StockChartData { Date = new DateTime(2012, 04, 30), Open = 85.4, High = 85.4857, Low = 80.7385, Close = 80.75, Volume = 615249365 },
        new StockChartData { Date = new DateTime(2012, 05, 07), Open = 80.2143, High = 82.2685, Low = 79.8185, Close = 80.9585, Volume = 541742692 },
        new StockChartData { Date = new DateTime(2012, 05, 14), Open = 80.3671, High = 81.0728, Low = 74.5971, Close = 75.7685, Volume = 708126233 },
        new StockChartData { Date = new DateTime(2012, 05, 21), Open = 76.3571, High = 82.3571, Low = 76.2928, Close = 80.3271, Volume = 682076215 },
        new StockChartData { Date = new DateTime(2012, 05, 28), Open = 81.5571, High = 83.0714, Low = 80.0743, Close = 80.1414, Volume = 480059584 }
     };
}

Blazor Stock Chart with Logarithmic Trendline

Exponential

An exponential trendline is a curved line that is most useful when data values rise or fall at increasingly higher rates. An exponential trendline cannot be created if the data contains zero or negative values.

To render an exponential trendline, set the trendline Type to Exponential.

@using Syncfusion.Blazor.Charts

<SfStockChart Title="AAPL Stock Price" SeriesType="@SeriesType" IndicatorType="@Indicator" ExportType="@ExportType">
    <StockChartPrimaryXAxis>
        <StockChartAxisMajorGridLines Color="Transparent"></StockChartAxisMajorGridLines>
    </StockChartPrimaryXAxis>
    <StockChartPrimaryYAxis>
        <StockChartAxisLineStyle Color="Transparent"></StockChartAxisLineStyle>
        <StockChartAxisMajorTickLines Color="Transparent" Width="0"></StockChartAxisMajorTickLines>
    </StockChartPrimaryYAxis>
    <StockChartSeriesCollection>
        <StockChartSeries DataSource="@StockDetails" Type="ChartSeriesType.Candle" XName="Date" High="High" Low="Low" Open="Open" Close="Close" Volume="Volume" Name="Google">
            <StockChartTrendlines>
                <StockChartTrendline Type="TrendlineTypes.Exponential" EnableTooltip="false"></StockChartTrendline>
            </StockChartTrendlines>
        </StockChartSeries>
    </StockChartSeriesCollection>
</SfStockChart>

@code {
    public List<TechnicalIndicators> Indicator = new List<TechnicalIndicators>();
    public List<ChartSeriesType> SeriesType = new List<ChartSeriesType>();
    public List<ExportType> ExportType = new List<ExportType>();

    public class StockChartData
    {
        public DateTime Date { get; set; }
        public Double Open { get; set; }
        public Double Low { get; set; }
        public Double Close { get; set; }
        public Double High { get; set; }
        public Double Volume { get; set; }
    }

    public List<StockChartData> StockDetails = new List<StockChartData>
    {
        new StockChartData { Date = new DateTime(2012, 04, 02), Open = 85.9757, High = 90.6657, Low = 85.7685, Close = 90.5257, Volume = 660187068 },
        new StockChartData { Date = new DateTime(2012, 04, 09), Open = 89.4471, High = 92, Low = 86.2157, Close = 86.4614, Volume = 912634864 },
        new StockChartData { Date = new DateTime(2012, 04, 16), Open = 87.1514, High = 88.6071, Low = 81.4885, Close = 81.8543, Volume = 1221746066 },
        new StockChartData { Date = new DateTime(2012, 04, 23), Open = 81.5157, High = 88.2857, Low = 79.2857, Close = 86.1428, Volume = 965935749 },
        new StockChartData { Date = new DateTime(2012, 04, 30), Open = 85.4, High = 85.4857, Low = 80.7385, Close = 80.75, Volume = 615249365 },
        new StockChartData { Date = new DateTime(2012, 05, 07), Open = 80.2143, High = 82.2685, Low = 79.8185, Close = 80.9585, Volume = 541742692 },
        new StockChartData { Date = new DateTime(2012, 05, 14), Open = 80.3671, High = 81.0728, Low = 74.5971, Close = 75.7685, Volume = 708126233 },
        new StockChartData { Date = new DateTime(2012, 05, 21), Open = 76.3571, High = 82.3571, Low = 76.2928, Close = 80.3271, Volume = 682076215 },
        new StockChartData { Date = new DateTime(2012, 05, 28), Open = 81.5571, High = 83.0714, Low = 80.0743, Close = 80.1414, Volume = 480059584 }
    };
}

Blazor Stock Chart with Exponential Trendline

Polynomial

A polynomial trendline is a curved line used when data fluctuates. To render a polynomial trendline, set the trendline Type to Polynomial. The PolynomialOrder property defines the polynomial value.

@using Syncfusion.Blazor.Charts

<SfStockChart Title="AAPL Stock Price" SeriesType="@SeriesType" IndicatorType="@Indicator" ExportType="@ExportType">
    <StockChartPrimaryXAxis>
        <StockChartAxisMajorGridLines Color="Transparent"></StockChartAxisMajorGridLines>
    </StockChartPrimaryXAxis>
    <StockChartPrimaryYAxis>
        <StockChartAxisLineStyle Color="Transparent"></StockChartAxisLineStyle>
        <StockChartAxisMajorTickLines Color="Transparent" Width="0"></StockChartAxisMajorTickLines>
    </StockChartPrimaryYAxis>
    <StockChartSeriesCollection>
        <StockChartSeries DataSource="@StockDetails" Type="ChartSeriesType.Candle" XName="Date" High="High" Low="Low" Open="Open" Close="Close" Volume="Volume" Name="Google">
            <StockChartTrendlines>
                <StockChartTrendline Type="TrendlineTypes.Polynomial" EnableTooltip="false"></StockChartTrendline>
            </StockChartTrendlines>
        </StockChartSeries>
    </StockChartSeriesCollection>
</SfStockChart>

@code {

    public List<TechnicalIndicators> Indicator = new List<TechnicalIndicators>();
    public List<ChartSeriesType> SeriesType = new List<ChartSeriesType>();
    public List<ExportType> ExportType = new List<ExportType>();

    public class StockChartData
    {
        public DateTime Date { get; set; }
        public Double Open { get; set; }
        public Double Low { get; set; }
        public Double Close { get; set; }
        public Double High { get; set; }
        public Double Volume { get; set; }
    }

    public List<StockChartData> StockDetails = new List<StockChartData>
    {
        new StockChartData { Date = new DateTime(2012, 04, 02), Open = 85.9757, High = 90.6657, Low = 85.7685, Close = 90.5257, Volume = 660187068 },
        new StockChartData { Date = new DateTime(2012, 04, 09), Open = 89.4471, High = 92, Low = 86.2157, Close = 86.4614, Volume = 912634864 },
        new StockChartData { Date = new DateTime(2012, 04, 16), Open = 87.1514, High = 88.6071, Low = 81.4885, Close = 81.8543, Volume = 1221746066 },
        new StockChartData { Date = new DateTime(2012, 04, 23), Open = 81.5157, High = 88.2857, Low = 79.2857, Close = 86.1428, Volume = 965935749 },
        new StockChartData { Date = new DateTime(2012, 04, 30), Open = 85.4, High = 85.4857, Low = 80.7385, Close = 80.75, Volume = 615249365 },
        new StockChartData { Date = new DateTime(2012, 05, 07), Open = 80.2143, High = 82.2685, Low = 79.8185, Close = 80.9585, Volume = 541742692 },
        new StockChartData { Date = new DateTime(2012, 05, 14), Open = 80.3671, High = 81.0728, Low = 74.5971, Close = 75.7685, Volume = 708126233 },
        new StockChartData { Date = new DateTime(2012, 05, 21), Open = 76.3571, High = 82.3571, Low = 76.2928, Close = 80.3271, Volume = 682076215 },
        new StockChartData { Date = new DateTime(2012, 05, 28), Open = 81.5571, High = 83.0714, Low = 80.0743, Close = 80.1414, Volume = 480059584 }
     };
}

Blazor Stock Chart with Polynomial Trendline

Power

A power trendline is a curved line best used with data sets that compare measurements increasing at a specific rate. To render a power trendline, set the trendline Type to Power.

Moving Average

A moving average trendline smooths fluctuations in data to show a pattern or trend more clearly. To render a moving average trendline, set the trendline Type to MovingAverage.

The Period property defines the period used to calculate the moving average.

@using Syncfusion.Blazor.Charts

<SfStockChart Title="AAPL Stock Price" SeriesType="@SeriesType" IndicatorType="@Indicator" ExportType="@ExportType">
    <StockChartPrimaryXAxis>
        <StockChartAxisMajorGridLines Color="Transparent"></StockChartAxisMajorGridLines>
    </StockChartPrimaryXAxis>
    <StockChartPrimaryYAxis>
        <StockChartAxisLineStyle Color="Transparent"></StockChartAxisLineStyle>
        <StockChartAxisMajorTickLines Color="Transparent" Width="0"></StockChartAxisMajorTickLines>
    </StockChartPrimaryYAxis>
    <StockChartSeriesCollection>
        <StockChartSeries DataSource="@StockDetails" Type="ChartSeriesType.Candle" XName="Date" High="High" Low="Low" Open="Open" Close="Close" Volume="Volume" Name="Google">
            <StockChartTrendlines>
                <StockChartTrendline Type="TrendlineTypes.MovingAverage" EnableTooltip="false"></StockChartTrendline>
            </StockChartTrendlines>
        </StockChartSeries>
    </StockChartSeriesCollection>
</SfStockChart>

@code {
    public List<TechnicalIndicators> Indicator = new List<TechnicalIndicators>();
    public List<ChartSeriesType> SeriesType = new List<ChartSeriesType>();
    public List<ExportType> ExportType = new List<ExportType>();

    public class ChartData
    {
        public DateTime Date { get; set; }
        public Double Open { get; set; }
        public Double Low { get; set; }
        public Double Close { get; set; }
        public Double High { get; set; }
        public Double Volume { get; set; }
    }

    public List<ChartData> StockDetails = new List<ChartData>
    {
        new StockChartData { Date = new DateTime(2012, 04, 02), Open = 85.9757, High = 90.6657, Low = 85.7685, Close = 90.5257, Volume = 660187068 },
        new StockChartData { Date = new DateTime(2012, 04, 09), Open = 89.4471, High = 92, Low = 86.2157, Close = 86.4614, Volume = 912634864 },
        new StockChartData { Date = new DateTime(2012, 04, 16), Open = 87.1514, High = 88.6071, Low = 81.4885, Close = 81.8543, Volume = 1221746066 },
        new StockChartData { Date = new DateTime(2012, 04, 23), Open = 81.5157, High = 88.2857, Low = 79.2857, Close = 86.1428, Volume = 965935749 },
        new StockChartData { Date = new DateTime(2012, 04, 30), Open = 85.4, High = 85.4857, Low = 80.7385, Close = 80.75, Volume = 615249365 },
        new StockChartData { Date = new DateTime(2012, 05, 07), Open = 80.2143, High = 82.2685, Low = 79.8185, Close = 80.9585, Volume = 541742692 },
        new StockChartData { Date = new DateTime(2012, 05, 14), Open = 80.3671, High = 81.0728, Low = 74.5971, Close = 75.7685, Volume = 708126233 },
        new StockChartData { Date = new DateTime(2012, 05, 21), Open = 76.3571, High = 82.3571, Low = 76.2928, Close = 80.3271, Volume = 682076215 },
        new StockChartData { Date = new DateTime(2012, 05, 28), Open = 81.5571, High = 83.0714, Low = 80.0743, Close = 80.1414, Volume = 480059584 }
   };
}

Blazor Stock Chart with Moving Average Trendline

Customization of Trendline

The Fill and Width properties customize the appearance of the trendline.

@using Syncfusion.Blazor.Charts

<SfStockChart Title="AAPL Stock Price">
    <StockChartSeriesCollection>
        <StockChartSeries DataSource="@StockDetails" Type="ChartSeriesType.Candle" XName="Date" High="High" Low="Low" Close="Close" Open="Open" Name="Google">
            <StockChartTrendlines>
                <StockChartTrendline Type="TrendlineTypes.MovingAverage" EnableTooltip="false" Fill="red" Width="2"></StockChartTrendline>
            </StockChartTrendlines>
        </StockChartSeries>
    </StockChartSeriesCollection>
</SfStockChart>

@code {
    public class ChartData
    {
        public DateTime Date { get; set; }
        public Double Open { get; set; }
        public Double Low { get; set; }
        public Double Close { get; set; }
        public Double High { get; set; }
        public Double Volume { get; set; }
    }

    public List<ChartData> StockDetails = new List<ChartData>
    {
        new ChartData { Date = new DateTime(2012, 04, 02), Open = 85.9757, High = 90.6657, Low = 85.7685, Close = 90.5257, Volume = 660187068 },
        new ChartData { Date = new DateTime(2012, 04, 09), Open = 89.4471, High = 92, Low = 86.2157, Close = 86.4614, Volume = 912634864 },
        new ChartData { Date = new DateTime(2012, 04, 16), Open = 87.1514, High = 88.6071, Low = 81.4885, Close = 81.8543, Volume = 1221746066 },
        new ChartData { Date = new DateTime(2012, 04, 23), Open = 81.5157, High = 88.2857, Low = 79.2857, Close = 86.1428, Volume = 965935749 },
        new ChartData { Date = new DateTime(2012, 04, 30), Open = 85.4, High = 85.4857, Low = 80.7385, Close = 80.75, Volume = 615249365 },
        new ChartData { Date = new DateTime(2012, 05, 07), Open = 80.2143, High = 82.2685, Low = 79.8185, Close = 80.9585, Volume = 541742692 },
        new ChartData { Date = new DateTime(2012, 05, 14), Open = 80.3671, High = 81.0728, Low = 74.5971, Close = 75.7685, Volume = 708126233 },
        new ChartData { Date = new DateTime(2012, 05, 21), Open = 76.3571, High = 82.3571, Low = 76.2928, Close = 80.3271, Volume = 682076215 },
        new ChartData { Date = new DateTime(2012, 05, 28), Open = 81.5571, High = 83.0714, Low = 80.0743, Close = 80.1414, Volume = 480059584 }
   };
}

Blazor Stock Chart with Custom Trendline