11.6 Bar Chart Colour No Legend
%>% ds ggplot(aes(x=wind_dir_3pm, fill=wind_dir_3pm)) + geom_bar() + scale_y_continuous(labels=comma) + labs(x=vnames["wind_dir_3pm"], y="Count") + theme(legend.position="none")
Colour can add interest to a plot, though (unlike this example) it is usually good to use the colour to communicate further information about the data. Nonetheless, it adds to the attractiveness of the visualisation.
A spread of colour is added through the aesthetic
wind_dir_3pm. This will fill the bars with
colour controlled by the different values of the variable
wind_dir_3pm. As this is also the variable being plotted
on the x-axis a different colour is chosen for each bar from a good
default set of colours.
We add a ggplot2::theme() element here to remove the legend
that would be displayed by default, by indicating that the
"none". An alternative to turn the
legend off is to provide show.legend=
FALSE to the
layer (i.e., ggplot2::geom_bar()). This then allows layer
specific control of the legends.
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