java.lang.Object

com.arbergashi.charts.render.BaseRenderer

com.arbergashi.charts.render.standard.ColumnRenderer

All Implemented Interfaces:: ChartRenderer

public final class ColumnRenderer extends BaseRenderer

ColumnRenderer - Vertical Column Chart

Professional column chart renderer for categorical data visualization. Displays vertical columns with gradient fill and shadows.

Features:

Vertical Orientation: Columns grow upward from baseline
Gradient Fill: Professional depth visualization
Negative Support: Columns below baseline for negative values
Spacing Control: Automatic column width based on data density
Zero-Allocation: Shape pooling for performance

Differences from BarRenderer:

BarRenderer: Horizontal bars (good for long category names)
ColumnRenderer: Vertical columns (good for time series, comparisons)

Use Cases:

Sales by quarter
Revenue comparisons
Survey results
Statistical distributions

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

ColumnRenderer()
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
- ColumnRenderer
  
  public ColumnRenderer()
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