radzen-blazor/Radzen.Blazor/RadzenArcGauge.razor

@using Radzen.Blazor.Rendering
@inherits GaugeBase

@if (Visible)
{
    <div @ref="Element" style=@Style @attributes=@Attributes class=@GetCssClass() id="@GetId()">
    @if (Width.HasValue && Height.HasValue)
    {
        <svg style="width: 100%; height: 100%">
            <CascadingValue Value=@this>
                @ChildContent
            </CascadingValue>
        </svg>
        @if (Values.Any())
        {
            @foreach (var value in Values)
            {
                <div class="rz-arc-gauge-value" style=@ValueStyle(value)>
                    @if (value.ShowValue)
                    {
                        @if (value.Template != null)
                        {
                            @value.Template(value)
                        }
                        else if (!string.IsNullOrEmpty(value.FormatString))
                        {
                            @string.Format(value.FormatString, value.Value)
                        }
                        else
                        {
                            @value.Value
                        }
                    }
                </div>
            }
        }
    }
    </div>
}

@code {
    IList<RadzenArcGaugeScaleValue> Values { get; set; } = new List<RadzenArcGaugeScaleValue>();

    string ValueStyle(RadzenArcGaugeScaleValue value)
    {
        var scale = value?.Scale;
        if (scale == null)
        {
            return "left: 0px; top: 0px";
        }

        return $"left: {scale.CurrentCenter.X.ToInvariantString()}px; top: {scale.CurrentCenter.Y.ToInvariantString()}px";
    }

    internal void AddValue(RadzenArcGaugeScaleValue value)
    {
        if (!Values.Contains(value))
        {
            Values.Add(value);

            StateHasChanged();
        }
    }

    protected override string GetComponentCssClass()
    {
        return $"rz-arc-gauge";
    }
}