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This is due to a bug in GHC. As a workaround, you can simply add the import
 
This is due to a bug in GHC. As a workaround, you can simply add the import
   
import Graphics.Rendering.Diagrams.Points
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import Diagrams.Core.Points
   
to your file. See also [http://projects.haskell.org/diagrams/manual/diagrams-manual.html#couldn-t-match-type-v-p2-with-r2 the user manual].
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to your file. See also [http://projects.haskell.org/diagrams/doc/manual.html#couldn-t-match-type-v-p2-with-r2 the user manual].
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[[Category:FAQ]]

Revision as of 09:08, 13 November 2013

Diagrams frequently asked questions.

Contents

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 Diagrams.Core.Points

to your file. See also the user manual.