66 lines
1.9 KiB
PHP
66 lines
1.9 KiB
PHP
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<?php
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/**
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* @param Moon[] $moons
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*/
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function calculateVelocity(array $moons)
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{
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foreach ($moons as $i => $base_moon) {
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foreach ($moons as $j => $target_moon) {
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if ($i === $j) {
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// same planet
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continue;
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}
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$velocity_x = $base_moon->getVelocity()->getX();
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$velocity_y = $base_moon->getVelocity()->getY();
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$velocity_z = $base_moon->getVelocity()->getZ();
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if ($base_moon->getX() > $target_moon->getX()) {
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--$velocity_x;
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} elseif ($base_moon->getX() < $target_moon->getX()) {
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++$velocity_x;
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}
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if ($base_moon->getY() > $target_moon->getY()) {
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--$velocity_y;
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} elseif ($base_moon->getY() < $target_moon->getY()) {
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++$velocity_y;
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}
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if ($base_moon->getZ() > $target_moon->getZ()) {
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--$velocity_z;
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} elseif ($base_moon->getZ() < $target_moon->getZ()) {
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++$velocity_z;
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}
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$base_moon->getVelocity()->setX($velocity_x)->setY($velocity_y)->setZ($velocity_z);
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}
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}
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}
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/**
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* @param Moon[] $moons
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*/
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function updateCoordinates(array $moons)
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{
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foreach ($moons as $moon) {
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$moon->setX($moon->getX() + $moon->getVelocity()->getX());
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$moon->setY($moon->getY() + $moon->getVelocity()->getY());
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$moon->setZ($moon->getZ() + $moon->getVelocity()->getZ());
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}
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}
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/**
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* @param Moon[] $moons
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* @return float|int
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*/
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function calculateEnergy(array $moons)
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{
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$energy = 0;
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foreach ($moons as $moon) {
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$pot = abs($moon->getX()) + abs($moon->getY()) + abs($moon->getZ());
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$velocity = $moon->getVelocity();
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$kin = abs($velocity->getX()) + abs($velocity->getY()) + abs($velocity->getZ());
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$energy += $pot * $kin;
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}
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return $energy;
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}
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