Adjusting themes

Besides deciding the visual property of a geometric object with aesthetic mapping, one can adjust the background color, grid lines, and other non-data properties with the theme. We introduce how to change the theme in this recipe.

Getting ready

Ensure you have completed the previous steps by storing sample_sum in your R environment.

How to do it…

Please perform the following steps to adjust the theme in ggplot2:

1. We can use different theme functions to adjust the theme of the plot:

   > g <- ggplot(data=sample_sum, mapping=aes(x=Year_Month, y=Total_Sales, colour = Province ))
   > g+geom_point(size=5) + theme_bw()+ ggtitle('theme_bw Example')
   > g+geom_point(size=5) + theme_dark()+ ggtitle('theme_dark Example')
   

   

   Figure 23: Scatterplot with different themes

2. We can set the theme freely with the theme function:

   > g +geom_point(size=5) + 
   + theme(
   +   axis.text = element_text(size = 12),
   +   legend.background = element_rect(fill = "white"),
   +   panel.grid.major = element_line...