ggplot2 Shapes and line types

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Note that the filled symbols 15-18 often render without proper anti-aliasing; they can appear jagged, pixelated, and not properly centered. Use symbols 19 and 21-25 to avoid these problems. For symbols 21-25 to appear solid, you will also need to specify a fill (bg) color that is the same as the outline color (col); otherwise they will be hollow.

Use the pch option to set the shape, and use lty and lwd to 

set the line type and width. The line type can be specified 

by name or by number. 

set.seed(331)

# Plot some points with lines
# Set up the plotting area
plot(NA, xlim=c(1,4), ylim=c(0,1))

# Plot solid circles with solid lines
points(1:4, runif(4), type="b", pch=19)
# Add open squares with dashed line, with heavier line width
points(1:4, runif(4), type="b", pch=0,  lty=2, lwd=3)

points(1:4, runif(4), type="b", pch=23,   # Diamond shape
       lty="dotted", cex=2,               # Dotted line, double-size shapes
       col="#000099", bg="#FF6666")       # blue line, red fill