Note: The newer Chart Gadget is much easier to use, unless you are well familiar with the Chart API.
Chart-bot is a Google Wave robot that can be used to display various charts and diagrams within a wave, using Google Chart API service.
Chart-bot Wave address is chart-bot@appspot.com.
To use Chart-bot, add chart-bot@appspot.com to a Wave and use the following syntax to display a chart:
chart:{google chart api parameters, url escaped}
For example, the following code:
chart:{cht=p3&chd=t:60,40&chs=250x100&chl=Hello|Wave}
will display the following chart:
and the following code:
chart:{cht=lxy&chs=200x125&chd=t:10,20,40,80,90,95,99|20,30,40,50,60,70,80|-1|5,25,45,65,85&chco=3072F3,ff0000,00aaaa&chls=2,4,1&chm=s,FF0000,0,-1,5|s,0000ff,1,-1,5|s,00aa00,2,-1,5}
will display the following chart:
Note that a broken image will appear if the syntax is invalid. If you re-edit the code, the chart will be replaced. However, there is a limit of one chart per blip.
For more info, wave eyalzh@googlewave.com.