}
function findConvexHull($points)
{
if (count($points) < 4) {
return $points;
}
$hull = array();
// Step 1: Find the two points with the min and max x positions.
$min_point = array_reduce($points, function ($carry, $item) {
return $item["x"] < $carry["x"] ? $item : $carry;
}, $points[0]);
$max_point = array_reduce($points, function ($carry, $item) {
return $item["x"] > $carry["x"] ? $item : $carry;
}, $points[0]);
array_push($hull, $min_point, $max_point);
// Step 2: Use the line between the two points to divide the remaining
// points into two sets, one for each side of the line.
list($side1, $side2) = partitionSides($min_point, $max_point, $points);
$hull = array_merge($hull, buildHullWithTriangles($min_point, $max_point, $side1), buildHullWithTriangles($min_point, $max_point, $side2));
return $hull;
}
function verifyConvexHull($actual, $expected)
{
return true;
}
$quickHull = function () {
srand(42);
$points = generatePoints(1000);
$hull = findConvexHull($points);
};
$QuickHull = new BenchmarkSuite('QuickHull', [100000], array(new Benchmark('QuickHull', true, false, 4400, $quickHull)));
use Sandfox\KDTree;
//This assumes you have cloned this repo and run composer dumpautoload
require_once '../vendor/autoload.php';
require_once 'libs.php';
$tree = new Sandfox\KDTree\Point();
$yFactor = 3;
$numDimensions = 4;
$totalPoints = 100000;
$resultsToReturn = 5000;
echo "Getting cached tree\n";
$cacheFindStartTime = microtime(true);
$myTree = getCachedTree();
if ($myTree === null) {
echo "No cached tree found\n";
echo "Generating a tree with " . $totalPoints . " points existing in " . $numDimensions . " space\n";
$points = generatePoints($totalPoints, $numDimensions, $yFactor);
echo "Building tree\n";
$startTime = microtime(true);
$myTree = KDTree\KDTree::build($points);
$stopTime = microtime(true);
echo "Finished building tree in " . ($stopTime - $startTime) . " seconds\n\n";
echo "Caching tree\n";
$cacheWriteStartTime = microtime(true);
cacheTree($myTree);
$cacheWriteStopTime = microtime(true);
echo "Finished caching tree in " . ($cacheWriteStopTime - $cacheWriteStartTime) . " seconds\n";
} else {
$cacheFindStopTime = microtime(true);
echo "Cache unserialized in " . ($cacheFindStopTime - $cacheFindStartTime) . " seconds\n";
}
$originPoint = new KDTree\Point();