Class DelaunayRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.specialized.DelaunayRenderer

All Implemented Interfaces:

ChartRenderer

public class DelaunayRenderer
extends BaseRenderer

Delaunay-like renderer (approximation): connects each point to nearby neighbors using a spatial grid or a KD-tree for large datasets. This reduces O(n^2) behavior while keeping the rendering path allocation-light. For very large datasets, it precomputes edges off-EDT and caches them to avoid jank.

Since:

2026-01-01

Version:

1.0.0

Author:

Arber Gashi

Field Summary

Fields inherited from class BaseRenderer

PIXEL_BUF, PIXEL_BUF4

Constructor Summary

Constructors

Constructor	Description
DelaunayRenderer()

Method Summary

Modifier and Type	Method	Description
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.
DelaunayRenderer	setMultiColor(boolean enabled)	Enables or disables multi-color rendering for supported renderers.

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, 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

clearHover, createContext, getFocusValues, getPreferredYRange, renderEmptyState, supportsEmptyState

Constructor Details

DelaunayRenderer

public DelaunayRenderer()

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

setMultiColor

public DelaunayRenderer setMultiColor(boolean enabled)

Description copied from class: BaseRenderer

Enables or disables multi-color rendering for supported renderers.

Overrides:

setMultiColor in class BaseRenderer

Parameters:

enabled - true to enable multi-color mode

Returns:

this renderer for chaining