you could ponder around with pow(x, 2), or use sin on the z element to make your arrow go up and down, or if you're really inclined use beziers. (hint: use sin).
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Re: How to calculate a flight arc....
[Re: Joozey]
#345477 10/26/1018:5410/26/1018:54
google 7zip , its a free compression tool like winzip but better
and your in luck too , that demo is one of the rare ones i made that is well commented , and the read me file explains clearly how i achieved the effect. good luck with your game