function draw_bullets()

 bullet_length = 3
 bullet_speed = 2

 if (#bullets > 0) then
  for k,v in pairs(bullets) do

   --check if out of screen
   if (v[1] > 200) then
    del(bullets,v)
   end

   if ( v[3] >= 0) then
    x1 = (v[1])
    x2 = (v[1] + bullet_length)
    y1 = (v[0]) * x1 + v[4]
    y2 = (v[0]) * x2 + v[4]

    y1=y1-1
    y2=y2-1

    line(x1,y1,x2,y2,11)
    v[2] = v[2] + bullet_speed
   else
    x1 = (v[1])
    x2 = (v[1] - bullet_length)
    y1 = (v[0]) * x1 + v[4]
    y2 = (v[0]) * x2 + v[4]

    y1=y1-1
    y2=y2-1

    line(x1,y1,x2,y2,11)
    v[2] = v[2] - bullet_speed
   end
  end
 end
end

function createbullet(x1,y1,x2,y2)
 bullet = {}
 bullet[0] = (y2-y1) / (x2-x1)
 bullet[1] = x1
 bullet[2] = y1
 bullet[3] = crosshair_x
 bullet[4] = -1*((y2-y1)/(x2-x1))*x1+y1
 add(bullets,bullet)
end