[Gtk2hs-devel] [ gtk2hs-Bugs-1350152 ] Missing methods in Cairo.Matrix

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Bugs item #1350152, was opened at 2005-11-07 10:40
Message generated for change (Settings changed) made by as49
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Category: General
Group: None
>Status: Closed
Resolution: None
Priority: 3
Submitted By: Axel Simon (as49)
Assigned to: Nobody/Anonymous (nobody)
Summary: Missing methods in Cairo.Matrix

Initial Comment:
I get this when compiling:

cairo/Graphics/Rendering/Cairo/Matrix.chs:60:
    Warning: No explicit method nor default method for `+'
             In the instance declaration for `Num Matrix'

cairo/Graphics/Rendering/Cairo/Matrix.chs:60:
    Warning: No explicit method nor default method for
`signum'
             In the instance declaration for `Num Matrix'

cairo/Graphics/Rendering/Cairo/Matrix.chs:60:
    Warning: No explicit method nor default method for
`abs'
             In the instance declaration for `Num Matrix'

cairo/Graphics/Rendering/Cairo/Matrix.chs:60:
    Warning: No explicit method nor default method for
`fromInteger'
             In the instance declaration for `Num Matrix'

What's the right way to fix this?
Axel.

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Comment By: Duncan Coutts (duncan_coutts)
Date: 2005-11-07 23:40

Message:
Logged In: YES 
user_id=36779

Fixed by supplying the following definitions for the class
methods:

  (+) = pointwise2 (+)
  (-) = pointwise2 (-)

  negate = pointwise negate
  abs    = pointwise abs
  signum = pointwise signum

  -- this definition of fromInteger means that 2*m = scale 2 m
  -- and it means 1 = identity
  fromInteger n = Matrix (fromInteger n) 0 0 (fromInteger n) 0 0

If these definitions look reasonable then lets close this bug.

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