Once again, it depends on the context and complexity of your visualization.Back in 2016, I had to prepare my PhD introductory talk and I started using package. It’s just the position of the circle on X and Y axes. Of course, this is not a requirement and it will change based on the complexity of the visualization you are making. Otherwise you will get an oval rather than a circle. This is required to make sure that there is no scaling along the X and Y axis and you indeed get a circle. I am using this example because you are familiar with the general idea from my previous post.ĭt 0 we get the inner circle, which results in a donut chart.Īpart from geom_arc_bar() you also need coord_fixed(). Let’s create a simple data set with electoral votes of Biden and Trump. Since it uses Cartesian coordinate system, including images in the plot is super simple. We will use geom_arc_bar() function from ggforce to create pie charts and donut charts. He is also the author of gganimate and patchwork packages. The developer of this package, Thomas Lin Pedersen, is in the core development team for ggplot2. In this post I show you how to overcome both these issues by using a relatively unknown package called ggforce. Otherwise, it is just a bar plot in Cartesian coordinates! On the other hand, the donut charts were created using polar coordinates. This is because annoate_raster() in ggplot2, which is used to insert images, doesn’t work with polar coordinates. For instance, it is impossible to overlay images on top of the donut charts. However, this creates problems when you want to use layers that belong to separate coordinate systems. This makes sense because these are two totally different coordinate systems. This means, you can’t have polar coordinates and Cartesian coordinates in the same plot. Ggplot2 can handle only one coordinate system per plot. This is confusing irrespective of how long you have been using ggplot2. Whether you will get a pie chart or a donut chart depends on xlim() which has no apparent connection to how the resulting plot will look like. However, there are two issues with this method. You can also create pie charts in the same way. In the previous post, I created a geofacet of donut charts using coord_polar() function from ggplot2.
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