sgeos

# PostgreSQL `mix ecto.create` equivalent
psql -c "CREATE USER ${DB_USER} WITH PASSWORD '${DB_PASSWORD}';"
createdb "${DB_NAME}"
psql -c "GRANT ALL PRIVILEGES ON DATABASE ${DB_NAME} to ${DB_USER};"

# PostgreSQL `mix ecto.drop` equivalent
dropdb "${DB_NAME}"
dropuser "${DB_USER}"

# PostgresSQL interactive terminal

sgeos

# Reference:
# http://www.csee.umbc.edu/~olano/s2002c36/ch02.pdf
# https://www.google.com/patents/US6867776

# A complete implementation of a function returning a value that
# conforms to the new method is given below.
# Translated from Java class definition to Elixir module.
defmodule SimplexNoiseReference do
  use Bitwise

sgeos

# A speed-improved simplex noise algorithm for 2D, 3D and 4D
# translated from Java into Elixir.
#
# Based on example code by Stefan Gustavson ([email protected]).
# Optimisations by Peter Eastman ([email protected]).
# Better rank ordering method for 4D by Stefan Gustavson in 2012.
# Translated into Elixir by Brendan Sechter ([email protected]).
#
# The Java version could be speeded up even further, but it's useful
# as it is.  Assessment of Java optimazations for the Elixir version

sgeos

# Reference:
# http://webstaff.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf

# Simplex noise in 2D, 3D and 4D
defmodule SimplexNoise do
  @grad3 {
    {1, 1, 0}, {-1, 1, 0}, {1, -1, 0}, {-1, -1, 0},
    {1, 0, 1}, {-1, 0, 1}, {1, 0, -1}, {-1, 0, -1},
    {0, 1, 1}, {0, -1, 1}, {0, 1, -1}, {0, -1, -1}
  }

sgeos

# Reference:
# http://webstaff.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf

# Classic Perlin noise in 3D, for comparison 
defmodule ClassicNoise do
  @grad3 {
    {1, 1, 0}, {-1, 1, 0}, {1, -1, 0}, {-1, -1, 0},
    {1, 0, 1}, {-1, 0, 1}, {1, 0, -1}, {-1, 0, -1},
    {0, 1, 1}, {0, -1, 1}, {0, 1, -1}, {0, -1, -1}
  }

sgeos

import Html
quote(do: markup do: text("hi")) |> Code.eval_quoted
markup do: text("hi")