R for Data Science Cookbook by David Chiu

Author:David Chiu
Language: eng
Format: epub
Publisher: Packt Publishing

Figure 26. Adjusting the scale of the bar plot

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 recipe, we introduced how to change the axis property with the add_axis function. However, the add_axis function only modifies the appearance of the axis; it does not alter the mapping data. To scale both the axis and the mapping data, one can use the scale_* function.

In this example, we begin by making a bar plot with the layer_bar function. We then use scale_numeric to replace the linear scale with a power scale. This rescales both the y axis and the height of the bars. Besides rescaling continuous values with the scale_numeric function, one can change the property of a discrete value with scale_nominal. At the end of the previous recipe, we demonstrated how to use scale_nominal to refill the bar with a given color vector.

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