更改图例中的字体大小

Question

I have a legend in my plot, but I'm trying to increase the font size so it fit the legend-box. When I try to increase the cex as defined below. The box gets bigger, while the text is still small.

Code:

legend(0,16, c("Available vCPUs", "Added vCPUs (1 per iteration ) "),
 col=c('red', 'black'), cex=0.39, lty=1:1, lwd=2)

Excerpt from plot:

Answer 1

First approach:

Try to set the font size before to plot the legend.

 x <- y <- rnorm(100, 0, 1)
 plot(x, y, type = "n")

## here you set the font size default to `x`, in this example 0.5
## save defaults in `op`

 op <- par(cex = 0.5)

 legend("topright", legend = "foo legend", pch = 1, bty = "n")

## here you set cexto 1.5
## save new defaults in `op`

 op <- par(cex = 1.5)

 legend("topright", legend = "foo legend", pch = 1, bty = "n")

Second approach:

Holding the pt.cex parameter to 1, while trying different values for cex inside the legend call. Remember to delete op .

x <- rnorm(100, 10, 4)
y <- rnorm(100, 10, 4)
plot(x, y, type = "n")

## I tried to feed cex with 1.5 and 0.5. The font size changes while the points remain unchanged.

legend("topleft", "Legend", cex=0.5, pch=1, pt.cex = 1)

Answer 2

You can use cex to determine font size, use bty='n' to indicate no lines around the legend, then draw a rectangle separately on the graph with rect(). For example:

with(data, legend(-10,7, legend=c("Name_of_Legend"), bty = 'n', col=c("red"), lty=0, pch=20, cex=0.75))
with(data, rect(-10,6.2,-3,7))

Answer 3

I think you can try using the y.intersp in legend, when the intervals between different text lines are reduced, you could increase text size without changing the size of legend box.

legend(0,16, c("Available vCPUs","Added vCPUs (1 per iteration )
"),col=c('red','black'),cex=0.39,lty=1:1,lwd=2, y.intersp = 0.3)