Class PolarRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.circular.PolarRenderer

All Implemented Interfaces:

ChartRenderer

public final class PolarRenderer
extends BaseRenderer

Modern Polar Area Renderer

Draws a professional, interactive polar area chart (also known as a rose chart). It's similar to a pie chart, but sectors have equal angles and differ in radius.

Features:

• Concentric Grid: A clean, circular grid for easy value comparison.
• Data Points: Renders data as distinct points on the polar grid.
• Hover Effect: Points are highlighted on mouse hover.
• Color Mapping: Point color can be mapped to a third dimension (weight).

Since:

2024-06-01

Version:

1.0.0

Author:

Arber Gashi

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	PolarRenderer.PointShape	Supported marker shapes for polar points.

Field Summary

Fields inherited from class BaseRenderer

PIXEL_BUF, PIXEL_BUF4

Constructor Summary

Constructors

Constructor	Description
PolarRenderer()

Method Summary

Modifier and Type	Method	Description
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.
PolarRenderer	setPointShape(PolarRenderer.PointShape shape)
PolarRenderer	setPointSize(double size)

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

clearHover, createContext, getFocusValues, getPreferredYRange, renderEmptyState, supportsEmptyState

Constructor Details

PolarRenderer

public PolarRenderer()

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

setPointSize

public PolarRenderer setPointSize(double size)

setPointShape

public PolarRenderer setPointShape(PolarRenderer.PointShape shape)