library(circlize)
library(RColorBrewer)
col<-RColorBrewer::brewer.pal(6,"Paired")
df<-data.frame(chr=sample(c(paste0("chr",1:6)),1000,replace = T),
               x=rnorm(1000),
               y=rnorm(1000))
head(df)
circos.initialize(factors = df$chr,x=df$x)
circos.trackPlotRegion(factors = df$chr,y=df$y,
                       panel.fun = function(x,y){
                         circos.axis()
                       })
for(i in 1:6){
  highlight.sector(sector.index = paste0("chr",i),col=col[i])
  circos.text(CELL_META$xcenter, CELL_META$ycenter,
              labels = paste0("chr",i),sector.index = paste0("chr",i))
}
circos.trackHist(df$chr,df$x,col=col)
circos.link("chr1",0,"chr2",0)
circos.link("chr4",c(-2,0),"chr3",c(-2,2),col="blue")
circos.link("chr4", c(0, 2), "chr6", c(-2, 0), col = "orange")
circos.link("chr5", c(0, 2), "chr1", c(-2, 2), col = "lightgrey")
circos.clear()

 

這里遇到一個問題是

circos.trackPoints(df$chr,df$x,df$y,pch=16,cex=0.5,col=col)
circos.trackHist(df$chr,df$x,col=col)

為什么circos.trackPoints(df$chr,df$x,df$y,pch=16,cex=0.5,col=col)沒有新創(chuàng)建一圈呢？
第二個問題是：
circos.text()函數的兩個參數

CELL_META$xcenter

CELL_META$ycenter

是哪里來的呀？如果我想把文本放在每個單元格的中間是固定用這兩個參數就可以嗎？

另外的參數

• sector.index

• track.index