Complex wave

Rem the purple wave is made out of two simple sinosoidal waves
fastgraphics
for t = 1 to 1000 step 0.1
clg
for n = 1 to 30  step 0.1
r=30*sin(t+n*0.2)
b=10*sin(t+n*0.8)
p= r+b
color red
circle 10*n,r+250,3
color blue
circle 10*n,b+200,3
color purple
circle 10*n,p+100,3
next n
refresh
next t