Here are a few options (others may have better ones): 1. Don't use shading lines. These were mainly used when color/grayscale was not available and are less needed now. Also, sometimes the used of shading lines causes a Moire vibration (the combination of the lines and the physiology of the eye give the illusion of movement) which makes the graph harder to read (see Tufte).
2. polygon (and friends) generally do either shading or color, but not both. When doing shading they use the color specified by par('fg'), so you can set par(fg='red'), plot the polygon, then change the forground color back to black (or whatever it was). If you want the outline of the polygon black, just plot another polygon (without density or color arguments) over the top of the red one. 3. create your plot they way you do now (with the wrong color), then use the plot2script function in the TeachingDemos package to get the low level commands that were used to create the plot. Find the segments functions and change the color from red to black (you will also need to remove the extra arguments from the box and polygon functions) then rerun the entire created script. This option is inferior to the 2 above unless you want really detailed control of the final plot, or really want to see the details that go into creating the plot. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Albrecht Kauffmann > Sent: Monday, April 23, 2007 3:27 AM > To: r-help@stat.math.ethz.ch > Subject: [R] colored shading lines > > Hi all, > > it there any possibility to draw colored shading lines of a > polygon plot? > E.g. > > plot(polygon_object,col="red",density=10,angle=45) > > produces only black shading lines within the polygon. > > With many thanks for any hint > > Albrecht > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.