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## A Winking Pink Elephant by Neil Gunther (with very slight modifications)
## URL: http://perfdynamics.blogspot.com/2011/06/winking-pink-elephant.html
param <- c(50-30i,18+8i,12-10i,-14-60i,1+20i)
parar <- param * exp(1i*pi/2) #rotate by 90 degrees
pinky <- function() {
Cx <- as.complex(rep(0,length(param)))
Cy <- as.complex(rep(0,length(param)))
tv <- seq(0,2*pi,length=1000)
for (i in 1:2) { #movie frames
Cx[1] <- parar[1] + Im(param[1])
Cx[2] <- parar[2] + Im(param[2])
Cx[3] <- Re(param[3])
Cx[4] <- Re(param[5]) - (i-1)
Cx[5] <- Re(param[4])
Cy[1] <- param[1] - Re(param[1]) + Im(param[4])
Cy[2] <- param[2] - Re(param[2])
Cy[3] <- param[3] - Re(param[3])
x <- c(fourier(tv, Cx))
y <- c(fourier(tv, Cy))
dev.hold()
plot(y, -x, type='l', col='red', lwd=10, axes=FALSE, ylab='', xlab='')
lines(y, -x, type='l', col='pink', lwd=4)
if (i > 1) points(Im(param[5]), Im(param[5]), col='black', pch=126, cex=2)
else points(Im(param[5]), Im(param[5]), col='black', pch=20, cex=2)
ani.pause(.25)
}
}
fourier <- function(tt,cc) {
wt <- rep(0, length(tt))
fsum <- function(n) {
if (n > 0) wt <- wt + fsum(n-1) + Re(cc[n]) * cos(n*tt) + Im(cc[n]) * sin(n*tt)
return(wt)
}
fsum(length(cc))
}
message('Press Esc under Windows or Ctrl-C under *nix to stop the animation')
while (TRUE) pinky()
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