Drawing an excellent cow

Question

I'm working in a big farm as a statistician and my master asked me to draw something to remind him his childhood. It was not easy for me to do that, because there was one big restriction: to do everything using only R. That's how I did that. Could you be so kind and help me to draw better cow?

library(ggplot2)

sim=function(xy){
  xx=xy[,"x"]*(-1)
  yy=xy[,"y"]
  gg=xy[,"gr"]
  xy=rbind(xy,cbind(xx,yy,gg))
  return(as.data.frame(xy))
}

circleFun <- function(center = c(0,0),diameter = 1, npoints = 100){
  r = diameter / 2
  tt <- seq(0,2*pi,length.out = npoints)
  xx <- center[1] + r * cos(tt)
  yy <- center[2] + r * sin(tt)
  return(data.frame(x = xx, y = yy))
}

n=100 

akys <- circleFun(c(1,5),1.5,npoints = n)
akys=as.matrix(cbind(akys,gr=4))
akys=sim(akys)

akys21 <- circleFun(c(1,4.5),0.5,npoints = n)
akys21=as.matrix(cbind(akys21,gr=5))

akys22 <- circleFun(c(-1,5.3),0.7,npoints = n)
akys22=as.matrix(cbind(akys22,gr=5))

nosis=circleFun(c(0.6,1),0.6,npoints = n)
nosis=as.matrix(cbind(nosis,gr=6))
nosis=sim(nosis)

x=c(0,1,3,3,2,0,0,1,1,0,3,5,2)
y=c(0,0,4,6,7,7,0,0,2,2,6,10,7)
gr=c(2,2,2,2,2,2,3,3,3,3,1,1,1)
xy=cbind(x=x,y=y,gr=gr)

data=sim(xy)
data=rbind(data,akys,akys21,akys22,nosis)

ggplot()+geom_polygon(data=data,mapping=aes(x=x,y=y,fill=factor(gr),group=gr), linetype=0, colour="black")+theme_bw()+
  scale_fill_manual(values=c("cornsilk2","chocolate4","lightpink","white","black","maroon4"))+
  theme(axis.line=element_blank(),axis.ticks=element_blank(),axis.text=element_blank(),legend.position="none",panel.grid=element_blank(),panel.border=element_blank())+xlab("")+ylab("")+
  ggtitle("Crazy Cow Wishing You Happy Easter!!!")

Answer 1

If you are on Linux and have cowsay installed the solution is fairly straightforward:

> system("cowsay I quit")
 ________
< I quit >
 --------
    \   ^__^
     \  (oo)\_______
        (__)\       )\/\
            ||----w |
            ||     ||