| circos.text | R Documentation | 
Draw text in a cell
circos.text(
    x, y,
    labels,
    sector.index = get.current.sector.index(),
    track.index = get.current.track.index(),
    direction = NULL,
    facing = c("inside", "outside", "reverse.clockwise", "clockwise",
    "downward", "bending", "bending.inside", "bending.outside"),
    niceFacing = FALSE,
    adj = par("adj"),
    cex = 1,
    col = par("col"),
    font = par("font"),
    ...)
| x | Data points on x-axis | 
| y | Data points on y-axis | 
| labels | Labels for each points | 
| sector.index | Index for the sector | 
| track.index | Index for the track | 
| direction | deprecated, use  | 
| facing | Facing of text. Please refer to vignette for different settings | 
| niceFacing | Should the facing of text be adjusted to fit human eyes? | 
| adj | offset for text. By default the text position adjustment is either horizontal or vertical in the canvas coordinate system. The "circular horizontal" offset can be set as a value in degree unit and the value should be wrapped by  | 
| ... | Pass to  | 
| cex | Font size | 
| col | Font color | 
| font | Font style | 
The function is similar to text. All you need to note is the facing settings.
https://jokergoo.github.io/circlize_book/book/graphics.html#text
sectors = letters[1:4]
circos.par(points.overflow.warning = FALSE)
circos.initialize(sectors, xlim = c(0, 10))
circos.trackPlotRegion(sectors, ylim = c(0, 10),
  track.height = 0.5, panel.fun = function(x, y) {
    circos.text(3, 1, "inside", facing = "inside", cex = 0.8)
    circos.text(7, 1, "outside", facing = "outside", cex = 0.8)
    circos.text(0, 5, "reverse.clockwise", facing = "reverse.clockwise",
        adj = c(0.5, 0), cex = 0.8)
    circos.text(10, 5, "clockwise", facing = "clockwise", adj = c(0.5, 0),
        cex = 0.8)
    circos.text(5, 5, "downward", facing = "downward", cex = 0.8)
    circos.text(3, 9, "====bending.inside====", facing = "bending.inside",
        cex = 0.8)
    circos.text(7, 9, "====bending.outside====", facing = "bending.outside",
        cex = 0.8)
})
circos.clear()
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