How do I make a google charts larger by scale

I've just started using google charts and want to use it in a small project I'm workin on but I've bumped into a problem. The thing is I want the charts rather big at a static size and look good but I'm generating the charts dynamically with php. Now the problem is that I can't get it to scale properly in width but height is perfectly fine.

Here's an example chart I've generated开发者_开发百科:

Parameters:

cht=bvo&chs=400x400

chd=t:1,4,1

chxr=2,0,4,1

chds=0,4

chco=4d89f9

chxt=x,x,y,y

chxl=0:|3|7|26|1:|Correct+answers|3:|People

You see how the chart fills the 400px of height but not the width. I've searched and look through the api but I can't get it right.

The default is not to scale the bar width to fit the width of the chart. Adding chbh=a will probably do what you want.

See the documentation for more information on controlling bar width and spacing.