1
# Copyright (c) 1996, 1997, The Regents of the University of California.
2
# All rights reserved. See Legal.htm for full text and disclaimer.
4
# ed williams' colorbar stuff
6
from scipy_base.fastumath import *
11
def nice_levels (z, n = 8) :
12
"""nice_levels(z, n = 8) finds approximately n "nice values"
13
between min(z) and max(z) for axis labels. n defaults to eight.
15
zmax = max (ravel (z))
16
zmin = min (ravel (z))
17
finest = abs (zmax - zmin) / float (n)
18
# blows up on zmin=zmax
19
unit = 10. ** floor (log10 (finest))
20
finest = finest / unit
28
cmin = unit * ceil (zmin / unit)
29
if (abs (cmin - zmin) < 0.01 * unit) :
31
cmax = unit * floor (zmax / unit)
32
if (abs (cmax - zmax) < 0.01 * unit) :
34
n = int ( ( (cmax - cmin) / unit + 0.5) + 1)
35
levs = span (cmin, cmax, n)
36
list = nonzero (less (abs (levs), 0.1 * unit))
38
array_set (levs, list, 0.0)
41
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') :
43
color_bar (minz, maxz) plots a color bar to the right of the plot square
44
labelled by the z values from minz to maxz.
47
color_bar (z (min, min), z (max, max))
50
plf (z, y, x, cmin = MINZ, cmax = MAXZ)
51
color_bar (MINZ, MAXZ)
56
ncol = 100 + (1 - split) * 100
58
if type (minz) == type (maxz) == type (1) : # Do not change!!!
59
plotval = reshape (arange (minz, maxz + 1, typecode = 'b'),
61
pli (plotval, xmin0, ymin, xmax0, ymax) # draw bar
63
pli (reshape (span (0, 1, ncol), (ncol, 1)),
64
xmin0, ymin, xmax0, ymax) # draw bar
66
pli (reshape (split_bytscl (span (0, 1, ncol), 0).astype ('b'), (ncol, 1)),
67
xmin0, ymin, xmax0, ymax) # draw bar
68
pldj (array ( [xmin0, xmin0]), array ( [ymin, ymax]), array ( [xmax0, xmax0]),
69
array ( [ymin, ymax]), color=color)
71
levs = nice_levels (array ( [minz, maxz]))
73
for i in range (len (levs)) :
74
scales.append ( "% .5g" % levs [i])
75
ys = ymin + (ymax - ymin) * (levs - minz) / (maxz - minz)
79
plt (scales [i], xmax0+0.005, ys [i], color=color) # labels
80
xmin = zeros (llev, Float)
81
xmax = zeros (llev, Float)
83
xmax [0:llev] = xmax0+0.005
85
pldj (xmin, ys, xmax, ys, color=color) # ticks
87
# Write the max and min on bar
88
xmid = (xmin0 + xmax0)/2.0
89
if max (ys) > (ymax-0.01):
90
plt ("% .5g" % maxz, xmid, ymax + 0.020, justify="CA",
93
plt ("% .5g" % maxz, xmid, ymax + 0.005, justify="CA",
95
plt ("% .5g" % minz, xmid, ymin - 0.0025, justify = "CT",
100
ymidpt = (ymax+ymin)/2.0
102
plt(zlabel, x0, ymidpt, color=color,
103
font=font, justify="CB", height=fontsize, orient=3)