Bar Displayer

A bar displayer has the following basic characteristics:

Class	IlvBarChartDisplayer
Category	Single
Number of real data sets displayed	1
Can be used with all types of projections	Yes
Items drawn	Bars

The following property is specific to a bar displayer:

Property	Methods	Default Value
Width of a Bar	getWidth setWidth	IlvChartDisplayerWidth
Width Percentage of a Bar	getWidthPercent setWidthPercent	100

If a width percentage is set, the width of the bars is no longer constant but proportional to the zoom level of the chart.

Bar Displayers in a Cartesian Chart and in a Polar Chart illustrates the fact that a bar displayer can be used with all types of projections. Data sets are represented by bar displayers in a Cartesian chart (using a Cartesian projection) and in a polar chart (using a polar projection).

Bar Displayers in a Cartesian Chart and in a Polar Chart

We can use the bar displayer displaying the gold bars as an example. We can create this displayer by using the following code:

IlvBarChartDisplayer* displayer = new IlvBarChartDisplayer(IlvChartDisplayerWidth); displayer->setForeground(dpy->getColor("red")); displayer->setBackground(dpy->getColor("gold"));

Note By default, the bars are outlined with the foreground color and filled with the background color the defined palette. They will be displayed only with the outline if the Drawn Filled property is set to IlvFalse.