Class ATRRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.financial.ATRRenderer

All Implemented Interfaces:

ChartRenderer

public final class ATRRenderer
extends BaseRenderer

ATRRenderer - Average True Range

Professional ATR indicator renderer for volatility measurement. ATR measures market volatility by decomposing the entire range of an asset price.

Features:

• ATR Line: 14-period average true range (default)
• Volatility Bands: Optional bands at ±1 ATR
• Smooth Rendering: Uses Wilder's smoothing method
• Zero-Allocation: Optimized for performance

Data Requirements:

Requires OHLC data with min (low), max (high), and previous close.

Calculation:

True Range = max(High - Low, |High - PrevClose|, |Low - PrevClose|)
ATR = Wilder's Smoothing of True Range over 14 periods

Interpretation:

• High ATR = High volatility (trending market)
• Low ATR = Low volatility (consolidation)
• ATR does not indicate direction, only volatility

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
ATRRenderer()

Method Summary

Modifier and Type	Method	Description
protected void	drawData(Graphics2D g, ChartModel model, PlotContext context)	Implementation-specific drawing logic.
double[]	getPreferredYRange(ChartModel model)	Optional Y-range override for autoscaling.

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, renderEmptyState, supportsEmptyState

Constructor Details

ATRRenderer

public ATRRenderer()

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

getPreferredYRange

public double[] getPreferredYRange(ChartModel model)

Description copied from interface: ChartRenderer

Optional Y-range override for autoscaling.

Renderers may return a {minY, maxY} array when the visible range should be based on derived data rather than the model's raw Y-values (e.g. indicators like MACD).

Parameters:

model - the layer model

Returns:

{minY, maxY} or null to use model Y-values