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Diagrams frequently asked questions.


1 Miscellaneous

1.1 Can I render a diagram to the screen and then know which part of the diagram a user has clicked on?

Yes. See the user manual section on using queries.

1.2 When I try to compile, the linking phase hangs eating CPU and never finishes

It seems this can be caused on OS X by a mixture of 32- and 64-bit libraries. For example see this bug report. Ensure that your GHC and your gtk libraries are either both 32-bit or both 64-bit.

2 Error messages

2.1 Couldn't match type `V (Point R2)' with `R2'

This is due to a bug in GHC. As a workaround, you can simply add the import

import Graphics.Rendering.Diagrams.Points

to your file. See also the user manual.