<?php
/*
* convert square definition from x,y,l (x,y, length) to x1,y1,x2,y2
*/
function point($sq)
{
return array(
'x1' => $sq['x'],
'y1' => $sq['y'],
'x2' => $sq['x'] + $sq['l'],
'y2' => $sq['y'] + $sq['l'],
);
}
/*
* return intersect square
*/
function intersect(array $ps)
{
$r = max(array_map(function($e) { return $e['x1']; }, $ps));
$l = min(array_map(function($e) { return $e['x2']; }, $ps));
$t = max(array_map(function($e) { return $e['y1']; }, $ps));
$b = min(array_map(function($e) { return $e['y2']; }, $ps));
if ($r < $l && $b > $t) {
return array(
'x1' => $l,
'y1' => $b,
'x2' => $r,
'y2' => $t,
);
}
return false;
}
/*
* return square area
*/
function area($sq) {
return abs(($sq['x1'] - $sq['x2']) * ($sq['y1'] - $sq['y2']));
}
// input data
$sq1 = array('x' => 2, 'y' => 2, 'l' => 4);
$sq2 = array('x' => 3, 'y' => 2, 'l' => 4);
echo 'Intersect: ' . ((false !== $intersect = intersect(array(point($sq1), point($sq2)))) ? 'yes' : 'no') . PHP_EOL;
if (false !== $intersect) {
echo 'Area: ' . area($intersect) . PHP_EOL;
}
preferences:
58.12 ms | 402 KiB | 5 Q