Building a pie chart
We know that a pie chart is a way to represent proportional numeric values by using slices that form a circle – a pie. With a pie chart being made up of a slice and a circle – simple geometric shapes – it is simple enough to implement them in SwiftUI.
This recipe will use a dataset based on the number of pets in three different European cities. Unlike the previous recipe, the data here has been made up.
Getting ready
This recipe doesn't have any external resources, so it is enough just to create a SwiftUI project called PieChart.
How to do it…
This recipe is slightly more complicated than usual because it has two main parts:
- Manipulating datapoints
- Visualizing datapoints
The datapoints value must be adjusted by finding the maximum value and adapting the others to fit the chart. Also, we must calculate the angles for each slice – the starting angle (which is the ending angle of the previous...
