Graphics Reference
In-Depth Information
If you use geom_text() , the text will be heavily overplotted on the same location, with one
copy per data point:
p + annotate( "text" , x = 3 , y = 48 , label = "Group 1" , alpha = .1 ) +
# Normal
geom_text(x = 4.5 , y = 66 , label = "Group 2" , alpha = .1 )
# Overplotted
In Figure 7-3 , each text label is 90% transparent, making it clear which one is overplotted. The
overplotting can lead to output with aliased (jagged) edges when outputting to a bitmap.
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