Square Wave chart

[marcio.nandi]

Hello. My name is Marcio and I am brasilian. I have a problem in my work because I didn't found how to plot a specific chart. Well, I need to plot a dinamic chart (but this is not the problem), this chart is a square wave that has a timesequence in the X axis and a number of categories (built in runTime) in the Y axis, and it must be categories, not numbers, I tried to use a LineStepChart and represent the categories with numbers but didn't work because the Y axis must show the categories. Sorry for any english mistake. Any help will be useful!! And thank you in advance.

[paradoxoff]

Use a SymbolAxis as y axis. Though this axis is a ValueAxis, it looks like a CategoryAxis, i.e. it can easily be used to show non-numeric tick labels.
Here is an example.