niter = 101
#
# Open a workstation.
#
wks_type = "png"
wks = Ngl.open_wks(wks_type, "color5")
#
# Define our own color table going around
# all the hues in the HLS color space, starting
# with blue.
#
for k in range(0, niter):
h = 360 * float(k) / float(niter)
r, g, b = Ngl.hlsrgb(h, 50., 100.)
Ngl.set_color(wks, k, r, g, b)
#
# Create the set and draw the color cells.
#
poly_res = Ngl.Resources()
for j in range(ny):
for i in range(nx):
x, y = get_cell(i, j, xl, xr, yb, yt, nx, ny)
iter = convg(complex(x[0], y[0]), niter, 0.001, 10000)
poly_res.gsFillColor = iter - 1 # iter will be at least one.
for i in range(len(x)):
x[i], y[i] = user2ndc(x[i], y[i])
Ngl.polygon_ndc(wks, x, y, poly_res)
Ngl.frame(wks)
niter = 101
#
# Open a workstation.
#
wks_type = "ps"
wks = Ngl.open_wks(wks_type,"color5")
#
# Define our own color table going around
# all the hues in the HLS color space, starting
# with blue.
#
for k in xrange(0,niter):
h = 360*float(k)/float(niter)
r,g,b = Ngl.hlsrgb(h, 50., 100.)
Ngl.set_color(wks, k, r, g, b)
#
# Create the set and draw the color cells.
#
poly_res = Ngl.Resources()
for j in xrange(ny):
for i in xrange(nx):
x, y = get_cell(i, j, xl, xr, yb, yt, nx, ny)
iter = convg(complex(x[0],y[0]), niter, 0.001, 10000)
poly_res.gsFillColor = iter-1 # iter will be at least one.
for i in xrange(len(x)):
x[i], y[i] = user2ndc(x[i], y[i])
Ngl.polygon_ndc(wks, x, y,poly_res)
Ngl.frame(wks)
#
Ngl.frame(wks)
#
# Illustrations and tests for the color conversion functions.
#
#
# Set a tolerance limit for HLS and HSV tests.
#
eps = 0.00001
#
# HLS to RGB: (120., 50., 100.) -> (1., 0., 0.)
#
r, g, b = Ngl.hlsrgb(120., 50., 100.)
if numpy.sometrue(numpy.greater(numpy.fabs([r - 1., g, b]), eps)):
print("color3: hlsrgb test failed")
#
# RGB to HLS: (1., 0., 0.) -> (120., 50., 100.)
#
h, l, s = Ngl.rgbhls(1., 0., 0.)
if numpy.sometrue(numpy.greater(numpy.fabs([h - 120., l - 50., s - 100.]),
eps)):
print("color3: rgbhls test failed")
#
# HSV to RGB: (120., 1., 1.) -> (0., 1., 0.)
#
r, g, b = Ngl.hsvrgb(120., 1., 1.)
# Ngl.frame(wks) # # Illustrations and tests for the color conversion functions. # # # Set a tolerance limit for HLS and HSV tests. # eps = 0.00001 # # HLS to RGB: (120., 50., 100.) -> (1., 0., 0.) # r,g,b = Ngl.hlsrgb(120., 50., 100.) if numpy.sometrue(numpy.greater(numpy.fabs([r-1., g, b]), eps)): print "color3: hlsrgb test failed" # # RGB to HLS: (1., 0., 0.) -> (120., 50., 100.) # h,l,s = Ngl.rgbhls(1., 0., 0.) if numpy.sometrue(numpy.greater(numpy.fabs([h-120.,l-50.,s-100.]), eps)): print "color3: rgbhls test failed" # # HSV to RGB: (120., 1., 1.) -> (0., 1., 0.) # r,g,b = Ngl.hsvrgb(120., 1., 1.) if numpy.sometrue(numpy.greater(numpy.fabs([r, g-1., b]), eps)):
