Using scales

Besides changing the appearance of axes and legends, we can rescale the mapping of the data and how it should be displayed on the plot with the scale function. In this recipe, we introduce how to scale data in ggvis.

Getting ready

Ensure you have installed and loaded ggvis into your R session. Also, you need to complete the previous steps by storing house in your R environment.

How to do it …

Please perform the following steps to rescale data in ggvis:

1. First, create a bar plot and then replace the linear scale with a power scale:

   > house %>% ggvis(~Status, ~Price, fill=~Status) %>% layer_bars() %>% scale_numeric("y", trans = "pow", exponent = 0.2)
   

   

   Figure 26. Adjusting the scale of the bar plot

2. We can change the fill color with the scale_nominal function:

   > house %>% ggvis(~Status, ~Price, fill=~Status) %>% layer_bars() %>% scale_nominal("fill", range = c("pink", "green", "lightblue"))
   

   

   Figure 27. Changing the fill color of the bar plot

How it works…

In the previous...