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#!/usr/bin/perl -w
# modules
use strict;
# tags used for grid drawing
my $TAGKEY="mapswithme";
my $GRIDVALUE="grid";
my $CAPTIONVALUE="gridcaption";
sub UsageAndExit
{
print("Generate OSM xml with world grid\n");
print("Usage: osm_grid_create.pl <bucketing_level>\n");
print(" where bucketing_level is [1..10]\n");
exit;
}
sub CellStringFromXYLevel
{
my $x = $_[0];
my $y = $_[1];
my $level = $_[2];
my $result = "";
while ($level > 0) {
if ($x % 2) {
if ($y % 2) {
$result .= "0";
} else {
$result .= "3";
}
} else {
if ($y % 2) {
$result .= "1";
} else {
$result .= "2";
}
}
$level--;
$x /= 2;
$y /= 2;
}
$result = reverse($result);
}
#######################################
# ENTRY POINT
#######################################
&UsageAndExit() if ($#ARGV < 0);
my $LEVEL = $ARGV[0];
&UsageAndExit() if ($LEVEL > 10 || $LEVEL < 1);
my $COUNT = 2 ** $LEVEL;
my $MINX = -180.0;
my $MAXX = 180.0;
my $MINY = -90.0;
my $MAXY = 90.0;
my $STEPX = ($MAXX - $MINX)/$COUNT;
my $STEPY = ($MAXY - $MINY)/$COUNT;
print <<OSM_HEADER;
<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="MapsWithMe">
<bounds minlat="$MINY" minlon="$MINX" maxlat="$MAXY" maxlon="$MAXX"/>
OSM_HEADER
# generate nodes
my $nodeID = 1;
for (my $y = $MINY; $y <= $MAXY; $y += $STEPY)
{
for (my $x = $MINX; $x <= $MAXX; $x += $STEPX)
{
printf(" <node id=\"$nodeID\" lat=\"%.10f\" lon=\"%.10f\"/>\n", $y, $x);
$nodeID++;
}
}
# generate squares and captions
my $wayID = 10000;
foreach my $y (0..$COUNT - 1)
{
foreach my $x (0..$COUNT - 1)
{
my $first = $x + $y * ($COUNT + 1) + 1;
my $second = $first + 1;
my $third = $second + $COUNT + 1;
my $fourth = $third - 1;
my $title = &CellStringFromXYLevel($x, $y, $LEVEL);
$nodeID++;
printf(" <node id=\"$nodeID\" lat=\"%.10f\" lon=\"%.10f\">\n", $MINY + $y * $STEPY + $STEPY/2, $MINX + $x * $STEPX + $STEPX/2);
printf(" <tag k=\"$TAGKEY\" v=\"$CAPTIONVALUE\"/>\n");
printf(" <tag k=\"name\" v=\"$title\"/>\n");
printf(" </node>\n");
print <<OSM_GRID_TILE;
<way id="$wayID">
<nd ref="$first"/>
<nd ref="$second"/>
<nd ref="$third"/>
<nd ref="$fourth"/>
<nd ref="$first"/>
<tag k="name" v="$title"/>
<tag k="$TAGKEY" v="$GRIDVALUE"/>
<tag k="layer" v="-5"/>
</way>
OSM_GRID_TILE
$wayID++;
}
}
print <<OSM_FOOTER;
</osm>
OSM_FOOTER
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