Class StreamgraphRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.specialized.StreamgraphRenderer

All Implemented Interfaces:

ChartRenderer

public final class StreamgraphRenderer
extends BaseRenderer

Streamgraph renderer: stacked, flowing area plots with optional smoothing. Avoids allocations in the main draw loop by reusing buffers and Path2D.

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
StreamgraphRenderer()

Method Summary

Modifier and Type	Method	Description
protected void	drawData(Graphics2D g2, 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

StreamgraphRenderer

public StreamgraphRenderer()

Method Details

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

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