Radar HUD calculation

for i = 1, max_targets do
        if targets[i] then
            -- calculate radar's values in radians
            azi_rad = target_azi[i] * pi2
            ele_rad = target_ele[i] * pi2

            -- local "unrotated" values
            target_x_unrot = math.sin(azi_rad)
            target_y_unrot = math.cos(ele_rad)

            -- rotate the radar values around the roll and pitch
            target_x = ((target_x_unrot * math.cos(roll)) + (target_y_unrot * math.sin(roll))) * target_dst[i]
            target_y = (-(target_x_unrot * math.sin(pitch)) + (target_y_unrot * math.cos(pitch))) * target_dst[i]

            -- idk why those numbers are like this, but this is the least f.cky solution
            target_px = ((w/2) - target_x/2)
            target_py = (target_y/2)

            -- draw the point on the screen where the enemy should be
            screen.setColor(255, 0, 0)
            screen.drawCircle(target_px, target_py, 2)  -- target point

            target_count = target_count + 1 -- update target cnt
        end
    end