Blazor Polar Area Chart

A Blazor Bootstrap polar area charts are similar to pie charts, but each segment has the same angle - the radius of the segment differs depending on the value.

Parameters

Name	Type	Default	Description	Added Version
Height	`int?`	null	Gets or sets chart container height.	3.0.0
HeightUnit	`Unit`	`Unit.Px`	Gets or sets chart container height unit of measure.	3.0.0
Width	`int?`	null	Gets or sets chart container width.	3.0.0
WidthUnit	`Unit`	`Unit.Px`	Gets or sets chart container width unit of measure.	3.0.0

Methods

Name	Return type	Description	Added Version
AddDataAsync(ChartData chartData, string dataLabel, IChartDatasetData data)	`Task<ChartData>`	Adds data to chart.	3.0.0
AddDataAsync(ChartData chartData, string dataLabel, `List<IChartDatasetData>` data)	`Task<ChartData>`	Adds dataset to chart.	3.0.0
AddDatasetAsync(ChartData chartData, IChartDataset chartDataset, IChartOptions chartOptions)	`Task<ChartData>`	Adds dataset to chart.	3.0.0
InitializeAsync(ChartData chartData, IChartOptions chartOptions, `string[]?` plugins = null)	Task	Initialize the chat.	3.0.0
ResizeAsync(int width, int height, Unit widthUnit = Unit.Px, Unit heightUnit = Unit.Px)	Task	Resize the chart.	3.0.0
UpdateAsync(ChartData chartData, IChartOptions chartOptions)	Task	Update the chart.	3.0.0

ChartData Members

Property Name	Type	Default	Required	Description	Added Version
Datasets	`List<IChartDataset>`	null	✔️	Gets or sets the Datasets.	3.0.0
Labels	`List<string>`	null	✔️	Gets or sets the Labels.	3.0.0

PolarAreaChartDataset Members

info

PolarAreaChartDataset implements IChartDataset and inherits from the parent class ChartDataset.

Property Name	Type	Default	Required	Description	Added Version
BackgroundColor	`List<string>?`	null		Arc background color.	3.0.0
BorderAlign	`List<string>?`	null		Supported values are 'center' and 'inner'. When 'center' is set, the borders of arcs next to each other will overlap. When 'inner' is set, it is guaranteed that all borders will not overlap.	3.0.0
BorderColor	`List<string>?`	null		Arc border color.	3.0.0
BorderDash	`List<double>?`	null		Arc border length and spacing of dashes.	3.0.0
BorderDashOffset	double	0.0		Arc border offset for line dashes.	3.0.0
BorderJoinStyle	`List<string>?`	null		Arc border join style. Supported values are 'round', 'bevel', 'miter'.	3.0.0
BorderWidth	`List<double>?`	null		Arc border width (in pixels).	3.0.0
Circular	bool	true		By default the Arc is curved. If false, the Arc will be flat.	3.0.0
Clip	`string?`	null		How to clip relative to chartArea. Positive value allows overflow, negative value clips that many pixels inside chartArea. 0 = clip at chartArea. Clipping can also be configured per side: `clip: {left: 5, top: false, right: -2, bottom: 0}`	3.0.0
Data	`List<double?>?`	null	✔️	Get or sets the Data.	3.0.0
Datalabels	`PieChartDatasetDataLabels`			Get or sets the data labels	3.0.0
Hidden	bool	false		Configures the visibility state of the dataset. Set it to true, to hide the dataset from the chart.	3.0.0
HoverBackgroundColor	`List<string>?`	null		Arc background color when hovered.	3.0.0
HoverBorderColor	`List<string>?`	null		Arc border color when hovered.	3.0.0
HoverBorderDash	`List<double>?`	null		Arc border length and spacing of dashes when hovered.	3.0.0
HoverBorderDashOffset	`double?`	null		Arc border offset for line dashes when hovered.	3.0.0
HoverBorderJoinStyle	`List<string>?`	null	Arc border join style when hovered. Supported values are 'round', 'bevel', 'miter'.	3.0.0
HoverBorderWidth	`List<double>?`	null		Arc border width when hovered (in pixels).	3.0.0
Label	`string?`	null		The label for the dataset which appears in the legend and tooltips.	3.0.0
Order	int	0		The drawing order of dataset. Also affects order for stacking, tooltip and legend.	3.0.0

PolarAreaChartDatasetDataLabels Members

info

PolarAreaChartDatasetDataLabels inherits from the parent class ChartDatasetDataLabels.

Property Name	Type	Default	Description	Added Version
Alignment	`Alignment`	`Alignment.None`	Gets or sets the data labels alignment.	3.0.0
Anchor	`Anchor`	`Anchor.None`	Gets or sets the data labels anchor.	3.0.0
BorderWidth	double	2	Gets or sets the border width	3.0.0

PolarAreaChartOptions Members

info

PolarAreaChartOptions inherits from the parent class ChartOptions.

Property Name	Type	Default	Description	Added Version
Locale	`string?`		Gets or sets the locale. By default, the chart is using the default locale of the platform which is running on.	3.0.0
MaintainAspectRatio	bool	true	Maintain the original canvas aspect ratio (width / height) when resizing.	3.0.0
Plugins	`PolarAreaChartPlugins`		Gets or sets the Plugins.	3.0.0
Responsive	bool	false	Resizes the chart canvas when its container does.	3.0.0

Examples

Prerequisites

Refer to the getting started guide for setting up charts.

How it works

In the following example, a categorical 12-color palette is used.

tip

For data visualization, you can use the predefined palettes ColorBuilder.CategoricalTwelveColors for a 12-color palette and ColorBuilder.CategoricalSixColors for a 6-color palette. These palettes offer a range of distinct and visually appealing colors that can be applied to represent different categories or data elements in your visualizations.

Blazor Bootstrap: Polar Area Chart Component - How it works

<PolarAreaChart @ref="polarAreaChart" Width="600" />

<div class="mt-5">
    <button class="btn btn-primary btn-sm" @onclick="async () => await RandomizeAsync()"> Randomize </button>
    <button class="btn btn-primary btn-sm" @onclick="async () => await AddDatasetAsync()"> Add Dataset </button>
    <button class="btn btn-primary btn-sm" @onclick="async () => await AddDataAsync()">Add Data</button>
</div>

@code {
    private PolarAreaChart polarAreaChart = default!;
    private PolarAreaChartOptions polarAreaChartOptions = default!;
    private ChartData chartData = default!;
    private string[]? chartColors;

    private int datasetsCount = 0;
    private int dataLabelsCount = 0;

    private Random random = new();

    protected override void OnInitialized()
    {
        chartColors = ColorUtility.CategoricalTwelveColors;
        chartData = new ChartData { Labels = GetDefaultDataLabels(5), Datasets = GetDefaultDataSets(1) };
        polarAreaChartOptions = new();
        polarAreaChartOptions.Responsive = true;
        polarAreaChartOptions.Plugins.Title!.Text = "2022 - Sales";
        polarAreaChartOptions.Plugins.Title.Display = true;
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await polarAreaChart.InitializeAsync(chartData, polarAreaChartOptions);
        }
        await base.OnAfterRenderAsync(firstRender);
    }

    private async Task RandomizeAsync()
    {
        if (chartData is null || chartData.Datasets is null || !chartData.Datasets.Any()) return;

        var newDatasets = new List<IChartDataset>();

        foreach (var dataset in chartData.Datasets)
        {
            if (dataset is PolarAreaChartDataset polarAreaChartDataset
                && polarAreaChartDataset is not null
                && polarAreaChartDataset.Data is not null)
            {
                var count = polarAreaChartDataset.Data.Count;

                var newData = new List<double?>();
                for (var i = 0; i < count; i++)
                {
                    newData.Add(random.Next(0, 100));
                }

                var backgroundColors = new List<string>();
                for (var index = 0; index < count; index++)
                {
                    backgroundColors.Add(chartColors![index].ToColor().ToRgbaString(0.5)); // RGBA
                }

                polarAreaChartDataset.Data = newData;
                polarAreaChartDataset.BackgroundColor = backgroundColors;
                newDatasets.Add(polarAreaChartDataset);
            }
        }

        chartData.Datasets = newDatasets;

        await polarAreaChart.UpdateAsync(chartData, polarAreaChartOptions);
    }

    private async Task AddDatasetAsync()
    {
        if (chartData is null || chartData.Datasets is null) return;

        var chartDataset = GetRandomPolarAreaChartDataset();
        chartData = await polarAreaChart.AddDatasetAsync(chartData, chartDataset, polarAreaChartOptions);
    }

    private async Task AddDataAsync()
    {
        if (dataLabelsCount >= 12)
            return;

        if (chartData is null || chartData.Datasets is null)
            return;

        dataLabelsCount += 1;

        var data = new List<IChartDatasetData>();
        foreach (var dataset in chartData.Datasets)
        {
            if (dataset is PolarAreaChartDataset polarAreaChartDataset)
                data.Add(new PolarAreaChartDatasetData(polarAreaChartDataset.Label, random.Next(0, 100), chartColors![dataLabelsCount - 1].ToColor().ToRgbaString(0.5), null));
        }

        chartData = await polarAreaChart.AddDataAsync(chartData, GetNextDataLabel(), data);
    }

    #region Data Preparation

    private List<string> GetDefaultDataLabels(int numberOfLabels)
    {
        var labels = new List<string>();
        for (var index = 0; index < numberOfLabels; index++)
        {
            dataLabelsCount += 1;
            labels.Add(GetNextDataLabel());
        }

        return labels;
    }

    private string GetNextDataLabel() => $"Product {dataLabelsCount}";

    private List<IChartDataset> GetDefaultDataSets(int numberOfDatasets)
    {
        var datasets = new List<IChartDataset>();

        for (var index = 0; index < numberOfDatasets; index++)
        {
            datasets.Add(GetRandomPolarAreaChartDataset());
        }

        return datasets;
    }

    private PolarAreaChartDataset GetRandomPolarAreaChartDataset()
    {
        datasetsCount += 1;
        return new()
            {
                Label = $"Team {datasetsCount}",
                Data = GetRandomData(),
                BackgroundColor = GetRandomBackgroundColors()
            };
    }

    private List<double?> GetRandomData()
    {
        var data = new List<double?>();
        for (var index = 0; index < dataLabelsCount; index++)
        {
            data.Add(random.Next(0, 100));
        }

        return data;
    }

    private List<string> GetRandomBackgroundColors()
    {
        var colors = new List<string>();
        for (var index = 0; index < dataLabelsCount; index++)
        {
            colors.Add(chartColors![index].ToColor().ToRgbaString(0.5)); // RGBA
        }

        return colors;
    }

    private List<string> GetRandomBorderColors()
    {
        var colors = new List<string>();
        for (var index = 0; index < dataLabelsCount; index++)
        {
            colors.Add(chartColors![index].ToColor().ToRgbString()); // RGB
        }

        return colors;
    }

    #endregion  Data Preparation
}

See the demo here.

Blazor Polar Area Chart

Parameters​

Methods​

ChartData Members​

PolarAreaChartDataset Members​

PolarAreaChartDatasetDataLabels Members​

PolarAreaChartOptions Members​

Examples​

Prerequisites​

How it works​

Parameters

Methods

ChartData Members

PolarAreaChartDataset Members

PolarAreaChartDatasetDataLabels Members

PolarAreaChartOptions Members

Examples

Prerequisites

How it works