Built-in Mathematica Symbol

BarChart

BarChart[{y₁, y₂, ...}]
makes a bar chart with bar lengths y₁, y₂,....

BarChart[{..., w_i[y_i, ...], ..., w_j[y_j, ...], ...}]
makes a bar chart with bar features defined by the symbolic wrappers w_k.

BarChart[{data₁, data₂, ...}]
makes a bar chart from multiple datasets data_i.

	y_i	a pure bar value
	w_i[y_i,...]	a bar with value y_i and wrapper w_i
	form_i->m_i	a bar form with metadata m_i

data not given in these forms is taken to be missing, and typically yields a gap in the bar chart.

	{e₁,e₂,...}	list of elements with or without wrappers
	w[{e₁,e₂,...},...]	wrapper applied to a whole dataset
	w[{data₁,data₁,...},...]	wrapper applied to all datasets

	Annotation[e,label]	provide an annotation
	Button[e,action]	define an action to execute when the element is clicked
	EventHandler[e,...]	define a general event handler for the element
	Hyperlink[e,uri]	make the element act as a hyperlink
	Labeled[e,...]	display the element with labeling
	Legended[e,...]	include features of the element in a chart legend
	Mouseover[e,over]	make the element show a mouseover form
	PopupWindow[e,cont]	attach a popup window to the element
	StatusArea[e,label]	display in the status area when the element is moused over
	Style[e,opts]	show the element using the specified styles
	Tooltip[e,label]	attach an arbitrary tooltip to the element

	Top,Bottom,Left,Right,Center	positions within bars
	Above, Below, Before, After	positions outside bars
	Axis	on the bar origin axis
	{{b_x,b_y},{l_x,l_y}}	scaled position {l_x, l_y} in the label at scaled position {b_x, b_y} in the bar

BarChart has the same options as Graphics with the following additions and changes:

AspectRatio	1/GoldenRatio	overall ratio of width to height
Axes	True	whether to draw axes
BarOrigin	Bottom	origin placement for bars
BarSpacing	Automatic	fractional spacing between bars
ChartBaseStyle	Automatic	overall style for bars
ChartElementFunction	Automatic	how to generate raw graphics for bars
ChartElements	Automatic	graphics to use in each of the bars
ChartLabels	None	labels for data elements and datasets
ChartLayout	Automatic	overall layout to use
ChartLegends	None	legends for data elements and datasets
ChartStyle	Automatic	style for bars
ColorFunction	Automatic	how to color bars
ColorFunctionScaling	True	whether to normalize arguments to ColorFunction
Joined	False	whether to join bars
LabelingFunction	Automatic	how to label bars
LegendAppearance	Automatic	overall appearance of legends
PerformanceGoal	$PerformanceGoal	aspects of performance to try to optimize

Possible settings for ChartLayout include "Grouped", "Stacked", "Stepped" and "Percentile".

The arguments supplied to ChartElementFunction are the bar region {{x_min, x_max}, {y_min, y_max}}, the data value y_i, and metadata {m₁, m₂, ...} from each level in a nested list of datasets.

A list of built-in settings for ChartElementFunction can be obtained from ChartElementData["BarChart"].

Style and other specifications from options and other constructs in BarChart are effectively applied in the order ChartStyle, ColorFunction, Style and other wrappers, ChartElements and ChartElementFunction, with later specifications overriding earlier ones.