# Plot Rect Transparency

4 messages
Open this post in threaded view
|

## Plot Rect Transparency

 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.   Jeff         [[alternative HTML version deleted]] ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
Open this post in threaded view
|

## Re: Plot Rect Transparency

 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 ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.