// cpt-city: fme/feet/spiral (cpt)
//
// Gradients taken from the source-code of drawmap, a cartographic
// package by Fred M. Erickson
//
// author: Fred M. Erickson
// copyright: GPLv2
// year: 2005
// url: https://phillips.shef.ac.uk/pub/cpt-city/fme/feet
#declare spiral =
color_map {
  [0.00000 color rgbf <0.2353,1.0000,0.2353,0.0000>]
  [0.03333 color rgbf <1.0000,1.0000,0.2353,0.0000>]
  [0.06667 color rgbf <1.0000,0.6471,0.2353,0.0000>]
  [0.10000 color rgbf <1.0000,0.2353,0.2353,0.0000>]
  [0.13333 color rgbf <1.0000,0.2353,1.0000,0.0000>]
  [0.16667 color rgbf <0.2353,1.0000,1.0000,0.0000>]
  [0.20000 color rgbf <0.6471,1.0000,0.6471,0.0000>]
  [0.23333 color rgbf <1.0000,1.0000,0.6471,0.0000>]
  [0.26667 color rgbf <1.0000,0.8235,0.6471,0.0000>]
  [0.30000 color rgbf <1.0000,0.6471,0.6471,0.0000>]
  [0.33333 color rgbf <1.0000,0.6471,1.0000,0.0000>]
  [0.36667 color rgbf <0.6471,0.6471,1.0000,0.0000>]
  [0.40000 color rgbf <0.6471,1.0000,1.0000,0.0000>]
  [1.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
}