Knockback efficiency

function Knock takes unit u, real angle, real speed, real time returns nothing
    local integer x=Cos(a)*speed
    local integer y=Sin(a)*speed
 // Yeah, some people like to store just the value of Sin(a), then multiplying it in each loop. That's too an option.

 // Now we have the x and y speed, and can begin the looping

 // Initiate the loop and run it!
 // etc, etc.
endfunction

function Trig_Action takes nothing returns nothing
    local unit u=GetSpellAbilityUnit()
    local unit u2=GetSpellTargetUnit()
    call Knock(u2,Atan2(GetUnitY(u2)-GetUnitY(u),GetUnitX(u2)-GetUnitX(u),600,1.5)
    set u2=null
    set u=null
endfunction

function Knock takes real dx, real dy, real speed, real dur returns noting
    local real r
    local real x
    local real y

    if dy==0 then
// Yeah, should never happen. But let's do this properly :)
        set x=speed
        set y=0
    else
        set r=dx/dy
        if dy<0 then
            set y=-1/SquareRoot(1+r*r)
        else
            set y=1/SquareRoot(1+k*k)
        endif

        if dx<0 then
            // Pythagoras'
            set x=-SquareRoot(speed*speed-y*y)
        else
            // Pythagoras'
            set x=SquareRoot(speed*speed-y*y)
        endif
    endif

 // Now we have the x and y speed, and can begin the looping

// Now it's the same as the trig-version.
 // Initiate the loop and run it!
 // etc, etc.
endfunction

function Trig_Actions takes nothing returns nothing
    local unit u=GetSpellAbilityUnit()
    local unit u2=GetSpellTargetUnit()
    call Knock(u2,GetUnitX(u2)-GetUnitX(u),GetUnitY(u2)-GetUnitY(u),600,1.5)
    set u2=null
    set u=null
endfunction

call SetArrayReal(myArray,myArrayIndexForXSpeed, Cos(angle)*speed*timer_updateInterval )