swap to nix and working version with multiple faded triangles

image-triangles.cabal

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+-- Initial image-triangles.cabal generated by cabal init.  For further
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+-- The name of the package.
+name:                image-triangles
+
+-- The package version.  See the Haskell package versioning policy (PVP)
+-- for standards guiding when and how versions should be incremented.
+-- https://wiki.haskell.org/Package_versioning_policy
+-- PVP summary:      +-+------- breaking API changes
+--                   | | +----- non-breaking API additions
+--                   | | | +--- code changes with no API change
+version:             0.1.0.0
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+-- The license under which the package is released.
+license:             BSD3
+
+-- The file containing the license text.
+license-file:        LICENSE
+
+-- The package author(s).
+author:              Jack Wines
+
+-- An email address to which users can send suggestions, bug reports, and
+-- patches.
+maintainer:          jackwines@mac.com
+
+-- A copyright notice.
+-- copyright:
+
+-- category:
+
+build-type:          Simple
+
+-- Extra files to be distributed with the package, such as examples or a
+-- README.
+extra-source-files:  CHANGELOG.md, README.md
+
+-- Constraint on the version of Cabal needed to build this package.
+cabal-version:       >=1.10
+
+
+executable image-triangles
+  -- .hs or .lhs file containing the Main module.
+  main-is:             Main.hs
+
+  -- Modules included in this executable, other than Main.
+  -- other-modules:
+
+  -- LANGUAGE extensions used by modules in this package.
+  other-extensions:    TupleSections
+
+  -- Other library packages from which modules are imported.
+  build-depends:       base, random, hip, colour, diagrams-lib, diagrams-svg
+
+  -- Directories containing source files.
+  hs-source-dirs:      src
+
+  -- Base language which the package is written in.
+  default-language:    Haskell2010