Class RadarRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.circular.RadarRenderer

All Implemented Interfaces:

ChartRenderer

public final class RadarRenderer
extends BaseRenderer

Modern Radar/Spider Renderer

Draws a professional, interactive radar chart with a spider-web grid, filled area, and hover effects, adhering to strict zero-allocation guidelines.

Features:

• Volumetric Fill: The chart area is filled with a transparent gradient for better visualization.
• Data Nodes: Each data point is highlighted with a distinct node.
• Hover Effect: Nodes and the chart outline glow on mouse hover.
• Smart Labels: Axis labels are automatically positioned for readability.

Since:

2024-06-01

Version:

1.0.0

Author:

Arber Gashi

Field Summary

Fields inherited from class BaseRenderer

PIXEL_BUF, PIXEL_BUF4

Constructor Summary

Constructors

Constructor	Description
RadarRenderer()

Method Summary

Modifier and Type	Method	Description
void	clearHover()	Clears any hover/highlight state.
protected void	drawData(Graphics2D g, 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

RadarRenderer

public RadarRenderer()

Method Details

drawData

protected void drawData(Graphics2D g,
 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.