Class PieRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.circular.PieRenderer

All Implemented Interfaces:

ChartRenderer

Direct Known Subclasses:

DonutRenderer

public class PieRenderer
extends BaseRenderer

Modern Pie Renderer

Draws a professional, interactive pie chart with intelligent external labeling and hover effects, adhering to strict zero-allocation guidelines.

Features:

• Smart Labels: Automatically places labels outside with leader lines to avoid clutter.
• Rich Labels: Displays category name and percentage value.
• Hover Effect: Segments brighten on mouse hover for better interactivity.
• Zero-Allocation: Highly optimized for performance.

Since:

2025-06-01

Version:

1.0.0

Author:

Arber Gashi

Field Summary

Fields inherited from class BaseRenderer

PIXEL_BUF, PIXEL_BUF4

Constructor Summary

Constructors

Modifier	Constructor	Description
	PieRenderer()
protected	PieRenderer(String key)

Method Summary

Modifier and Type	Method	Description
void	clearHover()	Clears any hover/highlight state.
protected void	drawData(Graphics2D g2, ChartModel model, PlotContext context)	Implementation-specific drawing logic.
Optional<Integer>	getPointAt(Point2D pixel, ChartModel model, PlotContext context)	Returns the data index nearest to the given pixel coordinate, if supported.
void	setHoverIndex(int index)

Methods inherited from class BaseRenderer

drawHighlightPoint, drawI18nLabel, drawLabel, getArc, getCachedFont, getCachedGradient, getCachedStroke, getCachedStroke, getCachedStroke, getCubicCurve, getEllipse, getId, getLayerIndex, getLegendColor, getLine, getName, getPathCache, getRect, getRoundRectangle, getSeriesColor, getSeriesStroke, getTheme, getTooltipText, isLegendRequired, isMultiColor, pBuffer, pBuffer4, render, resolveTheme, seriesOrBase, setLayerIndex, setMultiColor, setTheme, setupQualityHints, themeAccent, themeAxisLabel, themeBackground, themeBearish, themeBullish, themeForeground, themeGrid, themeSeries

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ChartRenderer

createContext, getFocusValues, getPreferredYRange, renderEmptyState, supportsEmptyState

Constructor Details

PieRenderer

public PieRenderer()

PieRenderer

protected PieRenderer(String key)

Method Details

drawData

protected void drawData(Graphics2D g2,
 ChartModel model,
 PlotContext context)

Description copied from class: BaseRenderer

Implementation-specific drawing logic. Must follow Zero-Allocation rules.

Specified by:

drawData in class BaseRenderer

getPointAt

public Optional<Integer> getPointAt(Point2D pixel,
 ChartModel model,
 PlotContext context)

Description copied from class: BaseRenderer

Returns the data index nearest to the given pixel coordinate, if supported.

Specified by:

getPointAt in interface ChartRenderer

Overrides:

getPointAt in class BaseRenderer

Parameters:

pixel - mouse/crosshair position in component coordinates

model - data model for this layer

context - current plot context

Returns:

optional point index

clearHover

public void clearHover()

Description copied from interface: ChartRenderer

Clears any hover/highlight state.

setHoverIndex

public void setHoverIndex(int index)