/usr/share/doc/libplplot11/examples/octave/x19c.m is in octave-plplot 5.9.9-2ubuntu2.
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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 | ## Copyright (C) 1998, 1999, 2000 Joao Cardoso.
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by the
## Free Software Foundation; either version 2 of the License, or (at your
## option) any later version.
##
## This program 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
## General Public License for more details.
##
## This file is part of plplot_octave.
## It is based on the corresponding demo function of PLplot.
1;
## Shows two views of the world map.
function ix19c
## Parse and process command line arguments
## (void) plparseopts( &argc, argv, PL_PARSE_FULL );
## Longitude (x) and latitude (y)
miny = -70;
maxy = 80;
plinit();
## Cartesian plots
## Most of world
minx = 190;
maxx = 190 + 360;
## Setup a custom latitude and longitude-based scaling function.
plslabelfunc( @geolocation_labeler, [] );
plcol0( 1 );
plenv( minx, maxx, miny, maxy, 1, 70 );
plmap( [], "usaglobe", minx, maxx, miny, maxy );
## The Americas
minx = 190;
maxx = 340;
plcol0( 1 );
plenv( minx, maxx, miny, maxy, 1, 70 );
plmap( [], "usaglobe", minx, maxx, miny, maxy );
## Clear the labeling function
plslabelfunc( [], [] );
## 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, [] );
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( [], "globe", minx, maxx, miny, maxy );
pllsty( 2 );
plmeridians( [], 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( [], [] );
plend1();
endfunction
function [xt, yt] = map_transform( x, y, data )
radius = 90.0 - y;
xt = radius .* cos( x * pi / 180.0 );
yt = radius .* sin( x * pi / 180.0 );
endfunction
##--------------------------------------------------------------------------
## 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.
##--------------------------------------------------------------------------
function [xp, yp] = mapform19( x, y )
[xp, yp] = map_transform( x, y, [] );
endfunction
## "Normalize" longitude values so that they always fall between -180.0 and
## 180.0
function norm = normalize_longitude( lon )
if ( lon >= -180.0 && lon <= 180.0 )
norm = lon;
else
times = floor( ( abs( lon ) + 180.0 ) / 360.0 );
if ( lon < 0.0 )
norm = lon + 360.0 * times;
else
norm = lon - 360.0 * times;
endif
endif
endfunction
## A custom axis labeling function for longitudes and latitudes.
function label = geolocation_labeler( axis, value, data )
global PL_X_AXIS PL_Y_AXIS
if ( axis == PL_Y_AXIS )
label_val = value;
if ( label_val > 0.0 )
direction_label = " N";
elseif ( label_val < 0.0 )
direction_label = " S";
else
direction_label = "Eq";
endif
elseif ( axis == PL_X_AXIS )
label_val = normalize_longitude( value );
if ( label_val > 0.0 )
direction_label = " E";
elseif ( label_val < 0.0 )
direction_label = " W";
else
direction_label = "";
endif
endif
if ( axis == PL_Y_AXIS && value == 0.0 )
## A special case for the equator
label = sprintf( "%s", direction_label );
else
label = sprintf( "%.0f%s", abs( label_val ), direction_label );
endif
endfunction
ix19c
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