Table of Contents

Class BOBPieChartBase<TY>

Namespace
BlazOrbit.Charts.Components
Assembly
BlazOrbit.Charts.dll

Shared rendering pipeline for circular distribution charts. Subclassed by BOBPieChart<TY> (full disc, InnerRadius = 0) and BOBDonutChart<TY> (annulus, InnerRadius ≈ 0.6).

Pie / donut do not have X / Y axes, so this base derives from BOBChartBase<object, TY> with TX bound to the dummy object type. 

public abstract class BOBPieChartBase<TY> : BOBChartBase<object, TY>, IDataVisualizationFamilyComponent

Type Parameters

TY

Numeric type of the slice values.

Inheritance
object
ComponentBase
BOBChartBase<object, TY>
BOBPieChartBase<TY>
Implements
Derived
Inherited Members

Constructors

BOBPieChartBase() 

protected BOBPieChartBase()

Properties

ChartTypeNoun

Subclass-specific noun used in BuildAriaLabel() (e.g. "Pie", "Donut") so the screen-reader announcement is accurate.

protected abstract string ChartTypeNoun { get; }

Property Value

string

InnerRadius

Inner-radius / outer-radius ratio in [0, 1). 0 → full pie. ~0.5–0.7 → donut. ≥1 invalid (clamped to 0.99).

[Parameter]
public double InnerRadius { get; set; }

Property Value

double

OnSliceClick

Fired when the user clicks a slice. Carries the slice label, raw value, declaration index and the computed percentage.

[Parameter]
public EventCallback<BOBChartSliceClickArgs<TY>> OnSliceClick { get; set; }

Property Value

EventCallback<BOBChartSliceClickArgs<TY>>

OnSliceHover

Fired when the user hovers a slice (mouseenter). Raised in addition to the native SVG <title> tooltip.

[Parameter]
public EventCallback<BOBChartSliceHoverArgs<TY>> OnSliceHover { get; set; }

Property Value

EventCallback<BOBChartSliceHoverArgs<TY>>

Padding

Pixel padding inside the SVG viewport so labels don't bump against the edge. 16px default.

[Parameter]
public double Padding { get; set; }

Property Value

double

ShowPercentages

When true (default), the slice's percentage is rendered at the arc's mid-radius. Skipped for slices smaller than 5% to avoid label collisions.

[Parameter]
public bool ShowPercentages { get; set; }

Property Value

bool

Slices

The slices rendered by the chart, in declaration order (clockwise from 12 o'clock).

[Parameter]
public IEnumerable<BOBChartSlice<TY>>? Slices { get; set; }

Property Value

IEnumerable<BOBChartSlice<TY>>

Methods

BuildAriaLabel()

Default ARIA label for the chart's <svg> root. Subclasses override to inject series / value summaries (improves screen-reader experience).

protected override string BuildAriaLabel()

Returns

string

RenderSvg(RenderTreeBuilder)

Concrete charts override this to emit SVG content. The supplied builder is positioned inside the <svg> root, so implementations only need to add geometry primitives (lines, paths, rects, text). Sequence numbers must remain unique within the override.

protected override void RenderSvg(RenderTreeBuilder builder)

Parameters

builder RenderTreeBuilder

Render tree builder positioned inside the SVG root.

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