Class GaugeRenderer

java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.circular.GaugeRenderer

All Implemented Interfaces:

ChartRenderer, ActionListener, HierarchyListener, EventListener

public final class GaugeRenderer
extends BaseRenderer
implements ActionListener, HierarchyListener

Modern Gauge Renderer

Draws a professional, highly configurable radial gauge, adhering to strict zero-allocation guidelines.

Features:

• Configurable Bands: Define colored ranges (e.g., green, yellow, red).
• Custom Range: Explicitly set the min/max values for the gauge scale.
• Modern Needle: A sleek, animated needle design.
• Center Value Display: Prominently displays the current value and unit.

Since:

2025-06-01

Version:

1.0.0

Author:

Arber Gashi

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	GaugeRenderer.Band	Defines a colored value band on the gauge scale.

Field Summary

Fields inherited from class BaseRenderer

PIXEL_BUF, PIXEL_BUF4

Constructor Summary

Constructors

Constructor	Description
GaugeRenderer()

Method Summary

Modifier and Type	Method	Description
void	actionPerformed(ActionEvent e)
protected void	drawData(Graphics2D g2, ChartModel model, PlotContext context)	Implementation-specific drawing logic.
void	hierarchyChanged(HierarchyEvent e)
boolean	isLegendRequired()	Indicates whether this renderer should appear in the legend.
GaugeRenderer	setBands(List<GaugeRenderer.Band> bands)
GaugeRenderer	setRange(double min, double max)
GaugeRenderer	setUnit(String unit)
GaugeRenderer	setValue(double value)

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

GaugeRenderer

public GaugeRenderer()

Method Details

actionPerformed

public void actionPerformed(ActionEvent e)

Specified by:

actionPerformed in interface ActionListener

hierarchyChanged

public void hierarchyChanged(HierarchyEvent e)

Specified by:

hierarchyChanged in interface HierarchyListener

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

setRange

public GaugeRenderer setRange(double min,
 double max)

setValue

public GaugeRenderer setValue(double value)

setUnit

public GaugeRenderer setUnit(String unit)

setBands

public GaugeRenderer setBands(List<GaugeRenderer.Band> bands)