High-Low Bar Displayer

Charts > Using the Charts Library > Data Display > Using Single Displayers > High-Low Bar Displayer

A high-low bar displayer has the following basic characteristics:

Class	IlvHiLoBarChartDisplayer
Category	Single
Inherits from	IlvHiLoChartDisplayer
Number of real data sets displayed	2
Can be used with all types of projections	Yes
Items drawn	High-low bar items

As with the high-low displayer, the high-low bar displayer displays two data sets. The first data set is composed of the low values and the second data set is composed of the high values. A high-low bar item is drawn between each pair of low-high values, the low values being taken in order from the first data set and the high values being taken in order from the second data set.

Figure 8.11 illustrates the fact that a high-low bar displayer can be used with all types of projections. Data sets are represented by a high-low bar displayer in a Cartesian chart (using a Cartesian projection) and in a polar chart (using a polar projection).

Figure 8.11 High-Low Bar Displayers in a Cartesian Chart and in a Polar Chart

We can use the high-low bar displayer displaying the white high-low bar items outlined in green and red as an example. We can create this displayer by using the following code:

IlvPalette* risePal = dpy->getPalette(dpy->getColor("white"),

dpy->getColor("green"),0,0,0,0,2);

IlvPalette* fallPal = dpy->getPalette(dpy->getColor("white"),

dpy->getColor("red"),0,0,0,0,2);

IlvHiLoBarChartDisplayer* displayer =

new IlvHiLoBarChartDisplayer(IlvChartDisplayerWidth,

risePal,

fallPal);

Note: By default, the high-low bar items are outlined with the foreground color of the defined rise and fall palettes and are filled with the background color of these palettes. The high-low bar items will be displayed only with the outline if the Drawn Filled property is set to IlvFalse.

Version 6.0