Effect Dopler

rem ============================================================================
rem        Effect Dopler
rem          By Papydall
rem ============================================================================

dim x,y,a,b,n
width 0,screen_x/2 : height 0,width(0)
top 0,(screen_y - height(0))/2 : left 0, (screen_x - width(0))/2
x = 200 : y = height(0)/2
picture 10 : width 10 ,width(0) : height 10,height(0): hide 10 : 2d_target_is 10
font_bold 10 : font_color 10,255,0,0 : font_size 10,20 : font_name 10,"comic sans ms"
color 10,0,0,0
print_target_is 10
print_locate 50,50 : print "EFFECT DOPLER ......... <CLICK> TO STOP"
image 20
rem ============================================================================
repeat
  for b = 1 to 10
      x = x + 1 : a = .5
      for n = 1 to 255 step 5
          a = a * -1 + .5
          2d_pen_color 255-a*n,255-a*n,255-a*n : 2d_fill_color 255-a*n,255-a*n,255-a*n
          2d_circle x + (n-b)*.5-255, y, 255-(n-b)
      next n
      copy_image()
  next b
  if x > screen_x -350 then x = 200
until scancode <> 0
terminate
rem ============================================================================
SUB Copy_Image()
    2d_image_copy 20,left(10),top(10),width(10),height(10)
    2d_target_is 0: 2d_image_paste 20,left(10),top(10)
    2d_target_is 10
END_SUB
rem ============================================================================