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Task/2048/PHP/2048.php
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227
Task/2048/PHP/2048.php
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<?php
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$game = new Game();
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while(true) {
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$game->cycle();
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}
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class Game {
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private $field;
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private $fieldSize;
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private $command;
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private $error;
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private $lastIndexX, $lastIndexY;
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private $score;
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private $finishScore;
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function __construct() {
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$this->field = array();
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$this->fieldSize = 4;
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$this->finishScore = 2048;
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$this->score = 0;
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$this->addNumber();
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$this->render();
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}
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public function cycle() {
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$this->command = strtolower($this->readchar('Use WASD, q exits'));
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$this->cls();
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if($this->processCommand()) {
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$this->addNumber();
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} else {
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if(count($this->getFreeList()) == 0 ) {
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$this->error = 'No options left!, You Lose!!';
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} else {
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$this->error = 'Invalid move, try again!';
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}
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}
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$this->render();
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}
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private function readchar($prompt) {
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readline_callback_handler_install($prompt, function() {});
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$char = stream_get_contents(STDIN, 1);
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readline_callback_handler_remove();
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return $char;
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}
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/**
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* Insert a number in an empty spot on the field
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*/
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private function addNumber() {
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$freeList = $this->getFreeList();
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if(count($freeList) == 0) {
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return;
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}
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$index = mt_rand(0, count($freeList)-1);
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$nr = (mt_rand(0,9) == 0)? 4 : 2;
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$this->field[$freeList[$index]['x']][$freeList[$index]['y']] = $nr;
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return;
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}
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/**
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* @return array(array('x' => <x>, 'y' => <y>)) with empty positions in the field
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*/
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private function getFreeList() {
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$freeList = array();
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for($y =0; $y< $this->fieldSize;$y++) {
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for($x=0; $x < $this->fieldSize; $x++) {
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if(!isset($this->field[$x][$y])) {
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$freeList[] = array('x' => $x, 'y' => $y);
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} elseif($this->field[$x][$y] == $this->finishScore) {
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$this->error = 'You Win!!';
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}
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}
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}
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return $freeList;
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}
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/**
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* Process a command:
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* @return is the command valid (Did it cause a change in the field)
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*/
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private function processCommand() {
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if(!in_array($this->command, array('w','a','s','d','q'))) {
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$this->error = 'Invalid Command';
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return false;
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}
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if($this->command == 'q') {
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echo PHP_EOL. 'Bye!'. PHP_EOL;
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exit;
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}
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// Determine over which axis and in which direction we move:
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$axis = 'x';
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$sDir = 1;
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switch($this->command) {
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case 'w':
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$axis = 'y';
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$sDir = -1;
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break;
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case 'a':
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$sDir = -1;
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break;
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case 's':
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$axis = 'y';
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break;
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case 'd':
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break;
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}
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$done = 0;
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// shift all numbers in that direction
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$done += $this->shift($axis, $sDir);
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// merge equal numbers in opposite direction
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$done += $this->merge($axis, $sDir * -1);
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// shift merged numbers in that direction
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$done += $this->shift($axis, $sDir);
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return $done >0;
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}
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private function shift($axis, $dir) {
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$totalDone = 0;
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for($i = 0; $i <$this->fieldSize; $i++) {
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$done = 0;
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foreach($this->iterate($axis,$dir) as $xy) {
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if($xy['vDest'] === NULL && $xy['vSrc'] !== NULL) {
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$this->field[$xy['dX']][$xy['dY']] = $xy['vSrc'];
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$this->field[$xy['sX']][$xy['sY']] = NULL;
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$done++;
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}
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}
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$totalDone += $done;
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if($done == 0) {
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// nothing to shift anymore
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break;
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}
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}
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return $totalDone;
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}
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private function merge($axis, $dir) {
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$done = 0;
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foreach($this->iterate($axis,$dir) as $xy) {
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if($xy['vDest'] !== NULL && $xy['vDest'] === $xy['vSrc']) {
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$this->field[$xy['sX']][$xy['sY']] += $xy['vDest'];
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$this->field[$xy['dX']][$xy['dY']] = NULL;
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$this->score += $this->field[$xy['sX']][$xy['sY']];
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$done ++;
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}
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}
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return $done;
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}
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/**
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* @return array List of src, dest pairs and their values to iterate over.
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*/
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private function iterate($axis, $dir) {
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$res = array();
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for($y = 0; $y < $this->fieldSize; $y++) {
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for($x=0; $x < $this->fieldSize; $x++) {
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$item = array('sX'=> $x,'sY' => $y, 'dX' => $x, 'dY' => $y, 'vDest' => NULL,'vSrc' => NULL);
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if($axis == 'x') {
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$item['dX'] += $dir;
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} else {
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$item['dY'] += $dir;
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}
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if($item['dX'] >= $this->fieldSize || $item['dY'] >=$this->fieldSize || $item['dX'] < 0 || $item['dY'] < 0) {
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continue;
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}
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$item['vDest'] = (isset($this->field[$item['dX']][$item['dY']]))? $this->field[$item['dX']][$item['dY']] : NULL;
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$item['vSrc'] = (isset($this->field[$item['sX']][$item['sY']]))? $this->field[$item['sX']][$item['sY']] : NULL;
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$res[] = $item;
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}
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}
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if($dir < 0) {
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$res = array_reverse($res);
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}
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return $res;
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}
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/// RENDER ///
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/**
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* Clear terminal screen
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*/
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private function cls() {
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echo chr(27).chr(91).'H'.chr(27).chr(91).'J';
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}
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private function render() {
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echo $this->finishScore . '! Current score: '. $this->score .PHP_EOL;
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if(!empty($this->error)) {
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echo $this->error . PHP_EOL;
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$this->error = NULL;
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}
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$this->renderField();
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}
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private function renderField() {
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$width = 5;
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$this->renderVSeperator($width);
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for($y =0; $y < $this->fieldSize; $y ++) {
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for($x = 0;$x < $this->fieldSize; $x++) {
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echo '|';
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if(!isset($this->field[$x][$y])) {
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echo str_repeat(' ', $width);
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continue;
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}
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printf('%'.$width.'s', $this->field[$x][$y]);
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}
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echo '|'. PHP_EOL;
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$this->renderVSeperator($width);
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}
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}
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private function renderVSeperator($width) {
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echo str_repeat('+'. str_repeat('-', $width), $this->fieldSize) .'+' .PHP_EOL;
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}
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}
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