Doppler efect

#Doppler efect
fastgraphics

x=0

loop:

for b = 1 to 10

color white

rect 0,0,300,300

x=x+1

a=.5

for n = 1 to 255 step 5

a=a*-1+.5

color rgb(255-a*n,255-a*n,255-a*n)

circle x + (n-b)*.5-255,150,255-(n-b)

next n

refresh

clg

next b

goto loop