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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
# $Id: xw19.py 12532 2013-09-26 15:18:37Z andrewross $
# Copyright (C) Wesley Ebisuzaki
# Copyright (C) 2009 Andrew Ross
#
# Illustrates backdrop plotting of world, US maps.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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 PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
from plplot_py_demos import *
def map_transform( x, y, xt, yt, data ):
radius = 90.0 - y
xt[0] = radius * cos( x * pi / 180.0 )
yt[0] = radius * sin( x * pi / 180.0 )
# mapform19
#
# Defines specific coordinate transformation for example 19.
# Not to be confused with mapform in src/plmap.c.
# x[], y[] are the coordinates to be plotted.
def mapform19(n, x, y):
for i in range(n):
radius = 90.0 - y[i]
xp = radius * cos(x[i] * pi / 180.0)
yp = radius * sin(x[i] * pi / 180.0)
x[i] = xp
y[i] = yp
return [x,y]
## "Normalize" longitude values so that they always fall between -180.0 and
## 180.0
def normalize_longitude(lon):
if ((lon >= -180.0) and (lon <= 180.0)):
return lon
else :
times = floor ((fabs(lon) + 180.0) / 360.0)
if (lon < 0.0) :
return(lon + 360.0 * times)
else :
return(lon - 360.0 * times)
## A custom axis labeling function for longitudes and latitudes.
def geolocation_labeler(axis, value, data):
if (axis == PL_Y_AXIS) :
label_val = value
if (label_val > 0.0) :
direction_label = " N"
elif (label_val < 0.0) :
direction_label = " S"
else :
direction_label = "Eq"
elif (axis == PL_X_AXIS) :
label_val = normalize_longitude(value)
if (label_val > 0.0) :
direction_label = " E"
elif (label_val < 0.0) :
direction_label = " W"
else :
direction_label = ""
if (axis == PL_Y_AXIS and value == 0.0) :
# A special case for the equator
label = direction_label
else :
label = `int(abs(label_val))` + direction_label
return label
# main
#
# Does a series of 3-d plots for a given data set, with different
# viewing options in each plot.
def main():
# Longitude (x) and latitude (y)
miny = -70
maxy = 80
# Cartesian plots
# Most of world
minx = -170
maxx = minx+360
# Setup a custom latitude and longitude-based scaling function.
plslabelfunc(geolocation_labeler, None)
plcol0(1)
plenv(minx, maxx, miny, maxy, 1, 70)
plmap(None,"usaglobe", minx, maxx, miny, maxy)
# The Americas
minx = 190
maxx = 340
plcol0(1)
plenv(minx, maxx, miny, maxy, 1, 70)
plmap(None, "usaglobe", minx, maxx, miny, maxy)
# Clear the labeling function
plslabelfunc(None, None)
# Polar, Northern hemisphere
minx = 0
maxx = 360
plenv(-75., 75., -75., 75., 1, -1)
plmap(mapform19,"globe", minx, maxx, miny, maxy)
pllsty(2)
plmeridians(mapform19,10.0, 10.0, 0.0, 360.0, -10.0, 80.0)
# Polar, Northern hemisphere, this time with a PLplot-wide transform
minx = 0
maxx = 360
plstransform( map_transform, None )
pllsty( 1 )
plenv( -75., 75., -75., 75., 1, -1 )
# No need to set the map transform here as the global transform will be
# used.
plmap( None, "globe", minx, maxx, miny, maxy )
pllsty( 2 )
plmeridians( None, 10.0, 10.0, 0.0, 360.0, -10.0, 80.0 )
# Show Baltimore, MD on the map
plcol0( 2 )
plssym( 0.0, 2.0 )
x = [ -76.6125 ]
y = [ 39.2902778 ]
plpoin( x, y, 18 )
plssym( 0.0, 1.0 )
plptex( -76.6125, 43.0, 0.0, 0.0, 0.0, "Baltimore, MD" )
# For C, this is how the global transform is cleared
plstransform( None, None )
main()
|
