Connected.Components/Components/Chart/Charts/Donut.razor.cs

using Microsoft.AspNetCore.Components;

namespace Connected.Components;

partial class Donut : Chart
{
	[CascadingParameter] public Chart ChartParent { get; set; }

	private List<SvgCircle> _circles = new();
	private List<SvgLegend> _legends = new();

	protected string ParentWidth => ChartParent?.Width;
	protected string ParentHeight => ChartParent?.Height;

	protected override void OnParametersSet()
	{
		_circles.Clear();
		_legends.Clear();
		double counterClockwiseOffset = 25;
		double totalPercent = 0;
		double offset;

		var counter = 0;
		foreach (var data in GetNormalizedData())
		{
			var percent = data * 100;
			var reversePercent = 100 - percent;
			offset = 100 - totalPercent + counterClockwiseOffset;
			totalPercent += percent;

			var circle = new SvgCircle()
			{
				Index = counter,
				CX = 21,
				CY = 21,
				Radius = 15.91549430918954,
				StrokeDashArray = $"{ToS(percent)} {ToS(reversePercent)}",
				StrokeDashOffset = offset
			};
			_circles.Add(circle);


			var labels = "";
			if (counter < InputLabels.Length)
			{
				labels = InputLabels[counter];
			}
			var legend = new SvgLegend()
			{
				Index = counter,
				Labels = labels,
				Data = data.ToString()
			};
			_legends.Add(legend);

			counter += 1;
		}
	}

}