#
# quick4.rb
#   $Id: quick4.rb,v 1.2 2000/11/18 19:03:42 keiko Exp $
#

require "narray"
require "numru/dcl"

include NumRu
include Math

nx = 37
ny = 37
xmin = 0
xmax = 360
ymin = -90
ymax = 90
drad = PI/180

p = NArray.sfloat(nx, ny)

#-- data ----
for j in 0..ny-1
  for i in 0..nx-1
    alon = (xmin + (xmax-xmin)*i/(nx-1))*drad
    alat = (ymin + (ymax-ymin)*j/(ny-1))*drad
    slat = sin(alat)
    p[i,j] = 3*sqrt(1-slat**2)*slat*cos(alon) - 0.5*(3*slat**2-1)
  end
end

#-- graph ----
iws = (ARGV[0] || (puts ' WORKSTATION ID (I)  ? ;'; DCL::sgpwsn; gets)).to_i
DCL::gropn iws
DCL::grfrm

DCL::grswnd(xmin, xmax, ymin, ymax)
DCL::grsvpt(0.2, 0.8, 0.2, 0.8)
DCL::grstrn(1)
DCL::grstrf

DCL::uetone(p)
DCL::usdaxs
DCL::udcntr(p)

DCL::grcls