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Using a Different Palette for a Discrete Variable

Problem

You want to use different colors for a discrete mapped variable.

Use one of the scales listed in Table 12-1.

Table 12-1. Discrete fill and color scales

Fill scale	Color scale	Description
`scale_fill_discrete()`	`scale_colour_discrete()`	Colors evenly spaced around the color wheel (same as hue)
`scale_fill_hue()`	`scale_colour_hue()`	Colors evenly spaced around the color wheel (same as discrete)
`scale_fill_grey()`	`scale_colour_grey()`	Greyscale palette
`scale_fill_brewer()`	`scale_colour_brewer()`	ColorBrewer palettes
`scale_fill_manual()`	`scale_colour_manual()`	Manually specified colors

In the example here we’ll use the default palette (hue), and a ColorBrewer palette (Figure 12-4):

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