This is part 3 in my series of articles about creating a custom field. I recommend reading Part 1: Field type and Part 2: Field widget first, if you have not done so already.
After creating the field type and field widget it is now time to complete the set by creating the field formatter.
a) Create the file
The field type must be located as follows:
N.B. The field formatter name should be in CamelCase.
In the newly created field type file add a brief comment to explain what it...