Class MovingAverageRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.analysis.MovingAverageRenderer

All Implemented Interfaces:

ChartRenderer

public final class MovingAverageRenderer
extends BaseRenderer

MovingAverageRenderer - Simple Moving Average (SMA) Overlay

Enterprise-grade moving average renderer with configurable window size, pixel decimation for large datasets, and dashed line styling.

Features:

• SMA Algorithm: Rolling window average calculation
• Configurable Window: Adjustable averaging period (default: 10)
• Pixel Decimation: Automatic downsampling for large datasets
• Dashed Style: Distinctive visual appearance with dash pattern
• Zero-Allocation: Path pooling and shape reuse
• Overlay Mode: Renders on top of existing data

Algorithm:

SMA[i] = (y[i] + y[i-1] + ... + y[i-window+1]) / window

Rolling window implementation:
  sum = sum + y[i] - y[i-window]
  avg = sum / window

Performance Characteristics:

• Complexity: O(n) with rolling sum (not O(n*w)!)
• Small (< 2k points): < 5ms
• Large (2k-50k): < 15ms with decimation
• Memory: Zero allocations (path pooling)

Configuration:

chart.render.ma.window=10          // Averaging window size
chart.render.ma.maxPoints=8000     // Decimation threshold
chart.render.ma.width=1.6          // Line width (scaled)
chart.render.decimate.pixel=true   // Enable pixel decimation

Visual Style:

• Dashed line (6px dash, 4px space)
• Semi-transparent (85% opacity)
• Rounded caps and joins
• Inherits series color

Use Cases:

• Trend identification in time-series data
• Noise reduction in scientific measurements
• Signal smoothing in financial charts

Since:

2026-01-01

Version:

2.0.0

Author:

Arber Gashi

Field Summary

Fields inherited from class BaseRenderer

PIXEL_BUF, PIXEL_BUF4

Constructor Summary

Constructors

Constructor	Description
MovingAverageRenderer()

Method Summary

Modifier and Type	Method	Description
protected void	drawData(Graphics2D g2, ChartModel model, PlotContext context)	Implementation-specific drawing logic.
boolean	isLegendRequired()	Indicates whether this renderer should appear in the legend.

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, 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

MovingAverageRenderer

public MovingAverageRenderer()

Method Details

isLegendRequired

public boolean isLegendRequired()

Description copied from class: BaseRenderer

Indicates whether this renderer should appear in the legend.

Specified by:

isLegendRequired in interface ChartRenderer

Overrides:

isLegendRequired in class BaseRenderer

Returns:

true if the renderer should appear in the legend

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