fld dword ptr [Xangle]      //Load Xangle in ST(0)
fsincos                     //ST(0) = Sin(Xangle) and ST(1) = Cos(Xangle)

fmul dword ptr [wobbleSize]  //push wobbleSize on the stack, ST(0) = wobbleSize, ST(1) = Sin, ST(2) = Cos
fiadd dword ptr[x]          //ST(0) = ST(0)+ x
fistp dword ptr[imXi]       //imXi = rounded integer of ST(0) and pop the stack

fmul dword ptr [wobbleSize]
fiadd dword ptr[y]          //ST(0) = ST(0)+ y
fistp dword ptr[imYi]       //imXi = rounded integer of ST(0) and pop the stack