[android-developers] Zooming in opengl es

hi all,

I have created 3d room using opengl es 1.1 on android
platform. i have implemented the rotate part and works fine now i want
to implement zoom in and out. how can i implement that i know v can do
it with the help of translatef or scalef but i dont know hot to detect
zoom in and zoom out please help me out...

Thanks in advance.....

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