Hi, I don't understand why you used scale_manual_colour if you want only black lines. To have different line types in the legend you can map the linetype to the data,
huron <- data.frame(year=1875:1972, level=LakeHuron) ggplot(huron, aes(year)) + geom_line(aes(y=level+5, linetype="above")) + geom_line(aes(y=level-5, linetype="below")) + scale_linetype_manual("offset", c(1, 2)) HTH, baptiste 2009/12/1 Edwin Sun <c...@cfr.msstate.edu>: > > Hello All, > > I am trying to create a legend for a black-white graph. The package I use is > ggplot2. It can add colors to the legend key but not line types. Can you > please help? > > # example from Wickman (2009, ggplot2 – elegant graphics for data analysis, > page 109) > > library(ggplot2) > huron <- data.frame(year=1875:1972, level=LakeHuron) > ggplot(huron, aes(year)) + > geom_line(aes(y=level+5, colour="above")) + > geom_line(aes(y=level-5, colour="below")) + > scale_colour_manual("Direction", c("above"="black", "below"="black")) > > Thanks, > > > Edwin > > Changyou Sun, Ph.D. > Associate Professor > Natural Resource Policy & Economics > Box 9681, Department of Forestry > Mississippi State University > Mississippi State, MS 39762 > > #363 Thompson Hall > (662) 325 7271 (ph), 325 8726 (fax) > c...@cfr.msstate.edu > www.cfr.msstate.edu/forestry > -- > View this message in context: > http://n4.nabble.com/ggplot-legend-for-multiple-time-series-tp932430p932430.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org 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@r-project.org 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.