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# Copyright (c) 1996, 1997, The Regents of the University of California.
# All rights reserved. See Legal.htm for full text and disclaimer.
# ed williams' colorbar stuff
from Numeric import *
from scipy_base.fastumath import *
from arrayfns import *
from gist import *
from slice3 import *
def nice_levels (z, n = 8) :
"""nice_levels(z, n = 8) finds approximately n "nice values"
between min(z) and max(z) for axis labels. n defaults to eight.
"""
zmax = max (ravel (z))
zmin = min (ravel (z))
finest = abs (zmax - zmin) / float (n)
# blows up on zmin=zmax
unit = 10. ** floor (log10 (finest))
finest = finest / unit
if finest > 5.0 :
finest = 10.
elif finest > 2. :
finest = 5.
elif finest > 1. :
finest = 2.
unit = unit * finest
cmin = unit * ceil (zmin / unit)
if (abs (cmin - zmin) < 0.01 * unit) :
cmin = cmin + unit
cmax = unit * floor (zmax / unit)
if (abs (cmax - zmax) < 0.01 * unit) :
cmax = cmax - unit
n = int ( ( (cmax - cmin) / unit + 0.5) + 1)
levs = span (cmin, cmax, n)
list = nonzero (less (abs (levs), 0.1 * unit))
if len (list) > 0 :
array_set (levs, list, 0.0)
return levs
def color_bar (minz, maxz, split = 0, ncol = None, ymax=0.85, ymin=0.44, xmin0=0.62, xmax0=0.64, zlabel=None, fontsize=16, font='helvetica', color='black') :
"""
color_bar (minz, maxz) plots a color bar to the right of the plot square
labelled by the z values from minz to maxz.
plf (z, y, x)
color_bar (z (min, min), z (max, max))
or
plf (z, y, x, cmin = MINZ, cmax = MAXZ)
color_bar (MINZ, MAXZ)
are typical usage
"""
if ncol is None:
ncol = 100 + (1 - split) * 100
plsys (0)
if type (minz) == type (maxz) == type (1) : # Do not change!!!
plotval = reshape (arange (minz, maxz + 1, typecode = 'b'),
(maxz + 1 - minz, 1))
pli (plotval, xmin0, ymin, xmax0, ymax) # draw bar
elif not split :
pli (reshape (span (0, 1, ncol), (ncol, 1)),
xmin0, ymin, xmax0, ymax) # draw bar
else :
pli (reshape (split_bytscl (span (0, 1, ncol), 0).astype ('b'), (ncol, 1)),
xmin0, ymin, xmax0, ymax) # draw bar
pldj (array ( [xmin0, xmin0]), array ( [ymin, ymax]), array ( [xmax0, xmax0]),
array ( [ymin, ymax]), color=color)
plsys (1)
levs = nice_levels (array ( [minz, maxz]))
scales = []
for i in range (len (levs)) :
scales.append ( "% .5g" % levs [i])
ys = ymin + (ymax - ymin) * (levs - minz) / (maxz - minz)
llev = len (levs)
rllev = range (llev)
for i in rllev :
plt (scales [i], xmax0+0.005, ys [i], color=color) # labels
xmin = zeros (llev, Float)
xmax = zeros (llev, Float)
xmin [0:llev] = xmin0
xmax [0:llev] = xmax0+0.005
plsys (0)
pldj (xmin, ys, xmax, ys, color=color) # ticks
plsys (1)
# Write the max and min on bar
xmid = (xmin0 + xmax0)/2.0
if max (ys) > (ymax-0.01):
plt ("% .5g" % maxz, xmid, ymax + 0.020, justify="CA",
color=color)
else :
plt ("% .5g" % maxz, xmid, ymax + 0.005, justify="CA",
color=color)
plt ("% .5g" % minz, xmid, ymin - 0.0025, justify = "CT",
color=color)
if zlabel is None:
pass
elif zlabel != "":
ymidpt = (ymax+ymin)/2.0
x0 = xmax0 + 0.04
plt(zlabel, x0, ymidpt, color=color,
font=font, justify="CB", height=fontsize, orient=3)
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