1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
#!/usr/bin/env python3
# Copyright (C) 2008-2016 Alan W. Irwin
#
# This file is part of PLplot.
#
# PLplot is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; version 2 of the License.
#
# PLplot is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with the file PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# Generate PLplot logo.
# Append to effective python path so that can find plplot modules.
from plplot_python_start import *
import sys
import plplot as w
# Parse and process command line arguments
w.plparseopts(sys.argv, w.PL_PARSE_FULL)
# Initialize plplot
w.plinit()
from numpy import *
# Data points in x
XPTS = 35
# Data points in
YPTS = 46
alt = 60.0
az = 30.0
# Routine for defining a specific color map 1 in HLS space.
# if gray is true, use basic grayscale variation from half-dark to light.
# otherwise use false color variation from blue (240 deg) to red (360 deg).
def cmap1_init(w, gray):
# Independent variable of control points.
i = array((0., 1.))
if gray:
# Hue for control points. Doesn't matter since saturation is zero.
h = array((0., 0.))
# Lightness ranging from half-dark (for interest) to light.
l = array((0.5, 1.))
# Gray scale has zero saturation
s = array((0., 0.))
else:
# Hue ranges from blue (240 deg) to red (0 or 360 deg)
h = array((240., 0.))
# Lightness and saturation are constant (values taken from C example).
l = array((0.6, 0.6))
s = array((0.8, 0.8))
# number of cmap1 colours is 256 in this case.
w.plscmap1n(256)
# Interpolate between control points to set up cmap1.
w.plscmap1l(0, i, h, l, s)
def main(w):
x = (arange(XPTS) - (XPTS / 2)) / float(XPTS / 2)
y = (arange(YPTS) - (YPTS / 2)) / float(YPTS / 2)
x = 1.5*x
y = 0.5 + y
x.shape = (-1,1)
r2 = (x*x) + (y*y)
z = (1. - x)*(1. - x) + 100 * (x*x - y)*(x*x - y)
# The log argument may be zero for just the right grid. */
z = log(choose(greater(z,0.), (exp(-5.), z)))
x.shape = (-1,)
zmin = min(z.flat)
zmax = max(z.flat)
nlevel = 10
step = (zmax-zmin)/(nlevel+1)
clevel = zmin + step + arange(nlevel)*step
w.plschr(0., 1.8)
w.plwidth(1)
w.pladv(0)
w.plvpor(0.0, 1.0, 0.0, 1.0)
w.plwind(-0.43, 0.840, 0.05, 0.48)
w.plcol0(1)
w.plw3d(1.0, 1.0, 1.0, -1.5, 1.5, -0.5, 1.5, zmin, zmax,
alt, az)
w.plbox3("bnstu", "", 0.0, 0,
"bnstu", "", 0.0, 0,
"bcdmnstuv", "", 0.0, 0)
# If converting the -dev svg result later with the ImageMagick
# "convert" application or viewing the svg result with the ImageMagick
# "display" application must compensate for the librsvg-2.22
# positioning bug since librsvg is what ImageMagick uses
# to interpret SVG results.
if_rsvg_bug = True
if if_rsvg_bug:
shift = 1.00
else:
shift = 1.07
w.plmtex3("zs", 5.0, shift, 1.0, "z axis")
w.plcol0(2)
# magnitude colored plot with faceted squares
cmap1_init(w, 0)
w.plsurf3d(x, y, z, w.MAG_COLOR | w.FACETED, ())
# Shading to provide a good background for legend.
x1 = 0.10
x2 = 0.8
w.plvpor(0.0, 1.0, 0.0, 1.0)
w.plwind(0.0, 1.0, 0.0, 1.0)
# Completely opaque from 0. to x1
w.plscol0a(15, 0, 0, 0, 1.0)
w.plcol0(15)
x=array([0., 0., x1, x1])
y=array([0., 1., 1., 0.])
w.plfill(x,y)
# Black transparent gradient.
pos = array([0.0, 1.0])
rcoord = array([0.0, 0.0])
gcoord = array([0.0, 0.0])
bcoord = array([0.0, 0.0])
acoord = array([1.0, 0.0])
rev = array([0, 0])
w.plscmap1n(2)
w.plscmap1la(1, pos, rcoord, gcoord, bcoord, acoord, rev)
x=array([x1, x1, x2, x2])
w.plgradient(x,y,0.)
# Logo Legend
w.plscol0a(15, 255, 255, 255, 1.0)
w.plcol0(15)
x1 = 0.03
w.plschr(0., 2.9)
w.plsfont(w.PL_FCI_SANS, w.PL_FCI_UPRIGHT, w.PL_FCI_BOLD)
w.plptex(x1, 0.57, 1.0, 0.0, 0.0, "PLplot")
w.plschr(0., 1.5)
w.plptex(x1, 0.30, 1.0, 0.0, 0.0,
"The ultimate in cross-platform plotting")
main(w)
# Terminate plplot
w.plend()
|
