On 28/06/2018 5:29 PM, Jeff Reichman wrote:
R-Help
Is there a way to make a rectangle transparent (alpha=0.1??)
plot(c(100, 200), c(300, 450), type= "n", xlab = "", ylab = "")
rect(110, 300, 175, 350, density = 5, border = "red")
Can't figure out how to take the changepoint function results and plot in
ggplot2 so I can just simply add rectangles to the plot function, but I need
to make transparent and there doesn't seem to be an alpha option.
Alpha is part of the colour spec. For example,
rect(110, 300, 175, 350, density = 5, border = rgb("red")
rect(110, 300, 175, 350, density = 5, border = rgb(red=1, green=0,
blue=0, alpha=0.1))
I'm not sure what is the quickest way to work out the rgb values for a
named colour (col2rgb can do it, but not in a convenient format) if you
want to add alpha to it.
Duncan Murdoch
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