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derickr/bench-rdp.php

Created June 27, 2020 09:50
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PHP RDP Simplify Benchmark
Raw
bench-rdp.php
<?php
$rounds = (int) $argv[1];
$callback = 'rdp_simplify';
if (! function_exists( $callback ) )
{
include 'rdp.php';
$callback = [ 'RDP', 'simplify' ];
}
echo "Using ", var_export( $callback, true ), "\n";
$json = json_decode( file_get_contents( dirname( __FILE__ ) . '/rdp-belgium.json' ) );
$points = $json[0]->geometry->coordinates[0];
for ($i = 0; $i < $rounds; $i++) {
$result = $callback( $points, 0.01 );
}
?>
Raw
rdp-belgium.json
[
{
"type": "Feature",
"properties": {
"popupContent": "<b><\/b><br\/>TZID: Europe\/Brussels\n<br\/>Time: 2017-05-18 16:45:42 CEST (+0200)\n",
"changed": false,
"name": "",
"classes": ""
},
"geometry": {
"type": "Polygon",
"coordinates": [
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}
}
]
Raw
rdp.php
<?php
class RDP
{
static function simplify( $points, $epsilon )
{
self::simplifyInternal( $points, $epsilon, 0, sizeof( $points ) - 1 );
return array_merge( $points );
}
private static function findPerpendicularDistance( $p, $p1, $p2 )
{
if ( $p1[0] == $p2[0] ) {
return abs( $p[0] - $p1[0] );
} else {
$slope = ( $p2[1] - $p1[1] ) / ( $p2[0] - $p1[0] );
$intercept = $p1[1] - ( $slope * $p1[0] );
$result = abs( $slope * $p[0] - $p[1] + $intercept ) / sqrt( pow( $slope, 2 ) + 1 );
return $result;
}
}
static private function simplifyInternal( &$points, $epsilon, $start, $end )
{
$firstPoint = $points[$start];
$lastPoint = $points[$end];
$index = -1;
$dist = 0;
if ( $end - $start < 2 ) {
return;
}
for ( $i = $start + 1; $i < $end; $i++ ) {
if ( !isset( $points[$i] ) ) {
continue;
}
$cDist = self::findPerpendicularDistance( $points[ $i ], $firstPoint, $lastPoint );
if ( $cDist > $dist ) {
$dist = $cDist;
$index = $i;
}
}
if ( $dist > $epsilon ) {
self::simplifyInternal( $points, $epsilon, $start, $index );
self::simplifyInternal( $points, $epsilon, $index, $end );
return;
} else {
for ( $i = $start + 1; $i < $end; $i++ ) {
unset( $points[$i] );
}
return;
}
}
}
@pounard
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pounard commented Jul 2, 2020

May be you should explicit types everywhere you can, it could help the JIT to optimize further ?

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