Spline Range Area in Blazor Charts Component

13 Sep 202422 minutes to read

Spline Range Area

Spline Range Area Chart shows variation in data values over time and fills the high and low range areas accordingly. To render a spline range area series in your chart, you need to follow a few steps to configure it correctly. Here’s a concise guide on how to do this:

  1. Set the series type: Define the series Type as SplineRangeArea in your chart configuration. This indicates that the data should be represented as a spline range area chart, which is ideal for visualizing continuous data points as a set of splines that vary between high and low values over intervals of time and across different categories.

  2. Provide high and low values: The SplineRangeArea series requires two y-values for each data point, you need to specify both the high and low values. The high value represents the maximum range, while the low value represents the minimum range for each data point. These values define the upper and lower boundaries of the area for each point on the chart.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"/>	
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Type="ChartSeriesType.SplineRangeArea">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X= "Wed", Low= 9.6, High= 17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

Blazor Spline Range Area Chart

Refer to our Blazor Spline Range Area Chart feature tour page to know about its other groundbreaking feature representations. Explore our Blazor Spline Range Area Chart Example to know how to show variations in the data values for a given time.

Binding data with series

You can bind data to the chart using the DataSource property within the series configuration. The DataSource value can be set using either SfDataManager property values or a list of business objects. More information on data binding can be found here. To display the data correctly, map the fields from the data to the chart series’ XName, High and Low properties.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"/>	
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Type="ChartSeriesType.SplineRangeArea">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X= "Wed", Low= 9.6, High= 17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

Series customization

The following properties can be used to customize the Spline Range Area series.

Fill

The Fill property determines the color applied to the series.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Fill="blue" Type="ChartSeriesType.SplineRangeArea">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X= "Wed", Low= 9.6, High= 17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

The Fill property can be used to apply a gradient color to the spline range area series. By configuring this property with gradient values, you can create a visually appealing effect in which the color transitions smoothly from one shade to another.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Fill="url(#grad1)" Type="ChartSeriesType.SplineRangeArea">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

<svg style="height: 0">
    <defs>
        <linearGradient id="grad1" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="20%" style="stop-color:orange;stop-opacity:1" />
            <stop offset="100%" style="stop-color:black;stop-opacity:1" />
        </linearGradient>
    </defs>
</svg>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X= "Wed", Low= 9.6, High= 17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

Opacity

The Opacity property specifies the transparency level of the Fill. Adjusting this property allows you to control how opaque or transparent the fill color of the series appears.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Fill="blue" Opacity="0.5" Type="ChartSeriesType.SplineRangeArea">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X= "Wed", Low= 9.6, High= 17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

DashArray

The DashArray property determines the dashes of series border.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
	
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Opacity="0.5"
                     DashArray="5,5" Fill="blue" Type="ChartSeriesType.SplineRangeArea">
            <ChartSeriesBorder Width="2" Color="red"></ChartSeriesBorder>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
	{
        new  ChartData { X=  "Sun", Low=  2.5, High=  9.8 },
        new  ChartData { X=  "Mon", Low=  4.7, High=  11.4 },
        new  ChartData { X=  "Tue", Low=  6.4, High=  14.4 },
        new  ChartData { X=  "Wed", Low=  9.6, High=  17.2 },
        new  ChartData { X=  "Thu", Low=  7.5, High=  15.1 },
        new  ChartData { X=  "Fri", Low=  3.0, High=  10.5 },
        new  ChartData { X=  "Sat", Low=  1.2, High=  7.9 }
    };
}

Border

ChartSeriesBorder property determines the Color and Width of series border.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
	
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Opacity="0.5"
                     DashArray="5,5" Fill="blue" Type="ChartSeriesType.SplineRangeArea">
            <ChartSeriesBorder Width="2" Color="red"></ChartSeriesBorder>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
	{
        new  ChartData { X=  "Sun", Low=  2.5, High=  9.8 },
        new  ChartData { X=  "Mon", Low=  4.7, High=  11.4 },
        new  ChartData { X=  "Tue", Low=  6.4, High=  14.4 },
        new  ChartData { X=  "Wed", Low=  9.6, High=  17.2 },
        new  ChartData { X=  "Thu", Low=  7.5, High=  15.1 },
        new  ChartData { X=  "Fri", Low=  3.0, High=  10.5 },
        new  ChartData { X=  "Sat", Low=  1.2, High=  7.9 }
    };
}

Empty points

Data points with null, double.NaN or undefined values are considered empty. Empty data points are ignored and not plotted on the chart.

Mode

Use the Mode property to define how empty or missing data points are handled in the series. The default mode for empty points is Gap.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Type="Syncfusion.Blazor.Charts.ChartSeriesType.SplineRangeArea">
            <ChartEmptyPointSettings Mode="EmptyPointMode.Zero"></ChartEmptyPointSettings>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
        new  ChartData { X=  "Sun", Low=  2.5, High=  9.8 },
        new  ChartData { X=  "Mon", Low=  4.7, High=  11.4 },
        new  ChartData { X=  "Tue", Low=  6.4, High=  14.4 },
        new  ChartData { X=  "Wed", Low=  double.NaN, High=  double.NaN },
        new  ChartData { X=  "Thu", Low=  7.5, High=  15.1 },
        new  ChartData { X=  "Fri", Low=  3.0, High=  10.5 },
        new  ChartData { X=  "Sat", Low=  1.2, High=  7.9 }
    };
}

Fill

Use the Fill property to customize the fill color of empty points in the series.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Type="Syncfusion.Blazor.Charts.ChartSeriesType.SplineRangeArea">
            <ChartEmptyPointSettings Mode="EmptyPointMode.Zero" Fill="red"></ChartEmptyPointSettings>
            <ChartMarker Visible="true" Height="10" Width="10"></ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
        new  ChartData { X=  "Sun", Low=  2.5, High=  9.8 },
        new  ChartData { X=  "Mon", Low=  4.7, High=  11.4 },
        new  ChartData { X=  "Tue", Low=  6.4, High=  14.4 },
        new  ChartData { X=  "Wed", Low=  double.NaN, High=  double.NaN },
        new  ChartData { X=  "Thu", Low=  7.5, High=  15.1 },
        new  ChartData { X=  "Fri", Low=  3.0, High=  10.5 },
        new  ChartData { X=  "Sat", Low=  1.2, High=  7.9 }
    };
}

Border

Use the Border property to customize the Width and Color of the border for empty points.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Type="Syncfusion.Blazor.Charts.ChartSeriesType.SplineRangeArea">
            <ChartEmptyPointSettings Mode="EmptyPointMode.Zero" Fill="red">
                <ChartEmptyPointBorder Color="green" Width="2"></ChartEmptyPointBorder>
            </ChartEmptyPointSettings>
            <ChartMarker Visible="true" Height="10" Width="10"></ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
        new  ChartData { X=  "Sun", Low=  2.5, High=  9.8 },
        new  ChartData { X=  "Mon", Low=  4.7, High=  11.4 },
        new  ChartData { X=  "Tue", Low=  6.4, High=  14.4 },
        new  ChartData { X=  "Wed", Low=  double.NaN, High=  double.NaN },
        new  ChartData { X=  "Thu", Low=  7.5, High=  15.1 },
        new  ChartData { X=  "Fri", Low=  3.0, High=  10.5 },
        new  ChartData { X=  "Sat", Low=  1.2, High=  7.9 }
    };
}

Events

Series render

The OnSeriesRender event allows you to customize series properties, such as Data, Fill, and Series, before they are rendered on the chart.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartEvents OnSeriesRender="SeriesRender"></ChartEvents>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Fill="blue" Opacity="0.5" Type="Syncfusion.Blazor.Charts.ChartSeriesType.SplineRangeArea">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public void SeriesRender(SeriesRenderEventArgs args)
    {
        args.Fill = "#FF4081";
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X=  "Wed", Low=  9.6, High=  17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

Point render

The OnPointRender event allows you to customize each data point before it is rendered on the chart.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartEvents OnPointRender="PointRender"></ChartEvents>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports" XName="X" High="High" Low="Low" Type="Syncfusion.Blazor.Charts.ChartSeriesType.SplineRangeArea">
            <ChartMarker Visible="true" Height="10" Width="10"></ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public string X { get; set; }
        public double Low { get; set; }
        public double High { get; set; }
    }

    public void PointRender(PointRenderEventArgs args)
    {
        args.Fill = (args.Point.Index % 2 != 0) ? "#ff6347" : "#009cb8";
    }

    public List<ChartData> WeatherReports = new List<ChartData>
    {
         new ChartData { X= "Sun", Low= 2.5, High= 9.8 },
         new ChartData { X= "Mon", Low= 4.7, High= 11.4 },
         new ChartData { X= "Tue", Low= 6.4, High= 14.4 },
         new ChartData { X= "Wed", Low=  9.6, High=  17.2 },
         new ChartData { X= "Thu", Low= 7.5, High= 15.1 },
         new ChartData { X= "Fri", Low= 3.0, High= 10.5 },
         new ChartData { X= "Sat", Low= 1.2, High= 7.9 }
    };
}

Refer to our Blazor Charts feature tour page for its groundbreaking feature representations and also explore our Blazor Chart Example to know various chart types and how to represent time-dependent data, showing trends at equal intervals.

See also