real DT2S(real distance, real time){
        return distance / time
    }
    
    real SD2T(real speed, real distance){
        return distance / speed
    }
    
    real ST2D(real speed, real time){
        return speed * time 
    }
    
    real ABU (unit A, unit B) {
        return Atan2(GetUnitY(B)-GetUnitY(A), GetUnitX(B)-GetUnitX(A))*bj_RADTODEG
    }

    real ABUC (unit A, real B_x, real B_y) {
        return Atan2(B_y-GetUnitY(A), B_x-GetUnitX(A))*bj_RADTODEG
    }

    real ABUC2 (real A_x, real A_y, real B_x, real B_y) {
        return Atan2(B_y - A_y, B_x - A_x) * bj_RADTODEG
    }

    real DBU (unit A, unit B) {
        real dx = GetUnitX(B) - GetUnitX(A)
        real dy = GetUnitY(B) - GetUnitY(A)
        return SquareRoot((dx * dx) + (dy * dy))
    }

    real DBC (unit A, real B_x, real B_y) {
        real dx = B_x - GetUnitX(A)
        real dy = B_y - GetUnitY(A)
        return SquareRoot((dx * dx) + (dy * dy))
    }

    real DBC2 (real A_x, real A_y, real B_x, real B_y) {
        real dx = B_x - A_x
        real dy = B_y - A_y
        return SquareRoot((dx * dx) + (dy * dy))
    }

    real DBC_Ex (unit A, real B_x, real B_y) {
        real dx = B_x - GetUnitX(A)
        real dy = B_y - GetUnitY(A)
        return GetMaxAvailableDistanceEx(A, SquareRoot((dx * dx) + (dy * dy)), ABUC(A, B_x, B_y))
    }

    real TBU (unit A, unit B, real speed) {
        real dx = GetUnitX(B) - GetUnitX(A)
        real dy = GetUnitY(B) - GetUnitY(A)
        return (SquareRoot((dx * dx) + (dy * dy)) / speed)
    }

    real TBC (unit A, real B_x, real B_y, real speed) {
        real dx = B_x - GetUnitX(A)
        real dy = B_y - GetUnitY(A)
        return (SquareRoot((dx * dx) + (dy * dy)) / speed)
    }

    real TBC_Ex (unit A, real B_x, real B_y, real speed) {
        real dx = B_x - GetUnitX(A)
        real dy = B_y - GetUnitY(A)
        return (GetMaxAvailableDistanceEx(A, SquareRoot((dx * dx) + (dy * dy)), ABUC(A, B_x, B_y))/speed)
    }

    function DisBtwUaI takes unit u, item i returns real
        local real dx = GetItemX(i) - GetUnitX(u)
        local real dy = GetItemY(i) - GetUnitY(u)
        return SquareRoot(dx * dx + dy * dy)
    endfunction