title: How can I make custom color in ggplot2?
body: <pre><code>library(ggplot2)    
  ggplot(foo6, aes(x=area, y=fd, colour = id)) + geom_point()
  
  id         lon        lat         area          fd              tp          rt    
  West    -109.3906   48.57889    349.6484    5.500000e+01    5.00000000  50.0000000
  West    -109.3906   48.57889    349.6484    1.775000e+01    5.00000000  12.7500000
  </code></pre>
  
  <p>There are four different kinds of IDs. Right now the plot takes the colors automatically. But I would like to mention the colors each ID takes myself. Could you please explain how to do it?</p>
  
  <p>Best</p>