List of ChartTypeVal for generating excel chart


I am trying to use ruby to generate graph in excel. However, i am facing
problem as I do not have the complete list of constant value for
different chart type. Do anyone know where can I find the source?

Also, may I know what is the code to change the chart title, x-axis
title and y-axis title?

I have tried to search from net, but usually I get the answer is in
Perl, VB, etc, but not ruby.