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参数说明：x：非负的数值向量，表示每个扇形的面积；
labels：各扇形面积标签的字符型向量；
radius ：表示饼图的圆的半径，取值-1到1之间；
clockwise ：逻辑值,用来指示饼图各个切片是否按顺时针做出分割；
init.angle：扇形面积起始角度，默认是0。如clockwise为真，init.angle默认取值90度；
code及示例：par(mfrow=c(2,3))
pie(c(1,2,3,4),)
pie(c(1,2,3,4),labels = c("e","w","n","s"))
pie(c(1,2,3,4),labels = c("e","w","n","s"),clockwise = TRUE)
pie(c(1,2,3,4),labels = c("e","w","n","s"),clockwise = TRUE,col = c("red","gray","green","black"))
pie(c(1,2,3,4),labels = c("e","w","n","s"),density = 10,clockwise = TRUE,col = c("red","gray","green","black"))
pie(c(1,2,3,4),labels = c("e","w","n","s"),density=10,angle=60,clockwise = TRUE,col = c("red","gray","green","black"))
补充：
1、饼图数据标签以百分数来表示
2、3D饼图的绘制方式
利用包plotrix中函数pie3D
pie3D(x,edges=NA,radius=1,height=0.1,theta=pi/6,start=0,border=par("fg"), col=NULL,labels=NULL,labelpos=NULL,labelcol=par("fg"),labelcex=1.5, sector.order=NULL,explode=0,shade=0.8,mar=c(4,4,4,4),pty="s",...)参数说明：radius：半径，默认取值1；height:饼块的高度，默认值为0.1；
start:绘制每一个冰块的起始角度，默认值为0；
labelpos:标签的可选位置；
sector.order:制定每个冰块的绘制顺序；
explode:冰块间距，默认取值0；
shade:取值0到1之间时，则降低扇区颜色的亮度以获得更好的3D效果。默认取值0.8；
pty：是否控制绘图区域，默认取值s（表示不能调整绘图区域），如取值m，可调整业边距；
code及示例
par(mfrow=c(2,3))
l<-c(1,2,3,4)
names<-c("a","b","c","d")
pct<-l/sum(l)*100
l1<-paste(pct,sep="","%")
l2<-paste(names,sep = " ",l1)
pie(l,labels = l2)
library(plotrix)
pie3D(l,labels=l2)
pie3D(l,labels = l2,explode = 0.1)
pie3D(l,labels = l2,explode = 0.1,col = terrain.colors(length(l)))
pie3D(l,labels = l2,explode = 0.1,col = terrain.colors(length(l)),shade = 0.1)
pie3D(l,labels = l2,explode = 0.1,col = terrain.colors(length(l)),shade = 0.1,sector.order = 4:1)
3、扇形图的绘制函数
fan.plot(x,edges=200,radius=1,col=NULL,align.at=NULL,max.span=NULL, labels=NULL,labelpos=NULL,label.radius=1.2,align="left",shrink=0.02, main="",ticks=NULL,include.sumx=FALSE,...)
示例及图形fan.plot(l,labels = names,main = "simple chart")
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