Render the square wave form graph using PHP

Question

I would like to render the square wave form of graph using the only values of zero and one on certain time intervals.

I used fusion chart line graph to render the chart but when the values changes from zero to one the line goes very slanting but i would like to show it straight.

For example check out the attached image it shows the square wave form. Suggest me which open source script used to generate these kind of chart( may be using GD with PHP). Anyother better idea ?

EDITED THE LINK

Square Wave Form image

Thanks in advance.

Answer 1

I suggest using JpGraph to generate these kind of charts.