What is the use of Auxiliary Line in R language Visualization ggplot Chart system

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In previous tweets, there was an introduction to the method of making excel chart guides, which used a variety of dazzling techniques.

On the other hand, the auxiliary lines in the ggplot chart system are very simple and easy to operate.

This is mainly due to the layer control concept of the ggplot function system and the developers of the package have long been aware of the chart element requirements at the chart auxiliary line level.

Next, I will demonstrate the chart auxiliary line operation in the form of several cases:

Library (ggplot2)

Library (reshape2)

Library (ggthemes)

Data