java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.statistical.QQPlotRenderer

All Implemented Interfaces:: ChartRenderer

public final class QQPlotRenderer extends BaseRenderer

QQPlotRenderer - Quantile-Quantile Plot

Professional Q-Q plot renderer for distribution comparison. Compares sample quantiles against theoretical distribution quantiles.

Features:

Quantile Points: Scatter plot of observed vs. expected quantiles
Reference Line: 45-degree line for perfect normal distribution
Distribution Test: Visual test for normality
Deviation Highlighting: Points far from line indicate non-normality

Interpretation:

Points on line = Data follows theoretical distribution
S-curve = Heavy tails (leptokurtic)
Inverted S-curve = Light tails (platykurtic)
Points above line at ends = Right-skewed data
Points below line at ends = Left-skewed data

Use Cases:

Normality testing
Distribution comparison
Regression diagnostics
Quality control

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

QQPlotRenderer()
Method Summary

Modifier and Type

Method

Description

protected void

drawData(Graphics2D g, ChartModel model, PlotContext context)

Implementation-specific drawing logic.

Methods inherited from class BaseRenderer
drawHighlightPoint, drawI18nLabel, drawLabel, getArc, getCachedFont, getCachedGradient, getCachedStroke, getCachedStroke, getCachedStroke, getCubicCurve, getEllipse, getId, getLayerIndex, getLegendColor, getLine, getName, getPathCache, getPointAt, 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
- QQPlotRenderer
  
  public QQPlotRenderer()
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