Class ChordDiagramRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.circular.ChordDiagramRenderer

All Implemented Interfaces:

ChartRenderer

public final class ChordDiagramRenderer
extends BaseRenderer

Modern Chord Diagram Renderer

Draws a professional, interactive chord diagram to visualize relationships or flows between entities. Adheres to strict zero-allocation guidelines by pre-calculating layout.

Features:

• Interactive Highlighting: Hovering over a group highlights its connections.
• Smart Labels: Labels are placed around the circle for readability.
• Pre-calculated Layout: All shapes are calculated once, making rendering extremely fast.

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

Constructor	Description
ChordDiagramRenderer()

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.

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

ChordDiagramRenderer

public ChordDiagramRenderer()

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.