PHP樹の深さ編歴生成迷宮とA*自動探索アルゴリズムの実例分析


本論文の実例はPHP樹の深さ編歴生成迷宮及びA*自動探索アルゴリズムについて述べている。皆さんの参考にしてください。具体的な分析は以下の通りです。
ある同僚が三思の迷宮アルゴリズムを紹介しました。見た感じは悪くないです。phpになります。
三思の迷宮のアルゴリズムは木の深さを採用して原理を遍歴するので、このように生成する迷宮はかなり細いです。
どの2点の間にも唯一の通路があります。
A*道を探すアルゴリズムは最も大衆化した全自動道を探すアルゴリズムです。
余計なことを言わないで、コードを貼ってください。
ラビリンス生成クラス:
class Maze{
    // Maze Create
    private $_w;
    private $_h;
    private $_grids;
    private $_walkHistory;
    private $_walkHistory2;
    private $_targetSteps;
    // Construct
    public function Maze() {
        $this->_w = 6;
        $this->_h = 6;
        $this->_grids = array();
    }
    //
    public function set($width = 6, $height = 6) {
        if ( $width > 0 ) $this->_w = $width;
        if ( $height > 0 ) $this->_h = $height;
        return $this;
    }
    //
    public function get() {
        return $this->_grids;
    }
    //
    public function create() {
        $this->_init();
        return $this->_walk(rand(0, count($this->_grids) -1 ));
    }
    //
    public function block($n = 0, $rand = false) {
        $l = count($this->_grids);
        for( $i = 1; $i < $l; $i++ ) {
            $v = $this->_grids[$i];
            if ( $v == 1 || $v == 2 || $v == 4 || $v == 8 ) {
                $return[] = $i;
            }
        }
        //
        if ( $rand ) shuffle($return);
 
        if ( $n == 0 ) return $return;
 
        if ( $n == 1 ) {
            return array_pop($return);
        } else {
            return array_slice($return, 0, $n);
        }
    }
    /**
    |---------------------------------------------------------------
    |
    |---------------------------------------------------------------
    */
    private function _walk($startPos) {
        $this->_walkHistory = array();
        $this->_walkHistory2 = array();
        $curPos = $startPos;
        while ($this->_getNext0() != -1) {
            $curPos = $this->_step($curPos);
            if ( $curPos === false ) break;
        }
        return $this;
    }
    private function _getTargetSteps($curPos) {
        $p = 0;
        $a = array();
        $p = $curPos - $this->_w;
        if ($p > 0 && $this->_grids[$p] === 0 && ! $this->_isRepeating($p)) {
            array_push($a, $p);
        } else {
            array_push($a, -1);
        }
        $p = $curPos + 1;
        if ($p % $this->_w != 0 && $this->_grids[$p] === 0 && ! $this->_isRepeating($p)) {
            array_push($a, $p);
        } else {
            array_push($a, -1);
        }
        $p = $curPos + $this->_w;
        if ($p < count($this->_grids) && $this->_grids[$p] === 0 && ! $this->_isRepeating($p)) {
            array_push($a, $p);
        } else {
            array_push($a, -1);
        }
        $p = $curPos - 1;
        if (($curPos % $this->_w) != 0 && $this->_grids[$p] === 0 && ! $this->_isRepeating($p)) {
            array_push($a, $p);
        } else {
            array_push($a, -1);
        }
        return $a;
    }
    private function _noStep() {
        $l = count($this->_targetSteps);
        for ($i = 0; $i < $l; $i ++) {
            if ($this->_targetSteps[$i] != -1) return false;
        }
        return true;
    }
    private function _step($curPos) {
        $this->_targetSteps = $this->_getTargetSteps($curPos);
        if ( $this->_noStep() ) {
            if ( count($this->_walkHistory) > 0 ) {
                $tmp = array_pop($this->_walkHistory);
            } else {
                return false;
            }
            array_push($this->_walkHistory2, $tmp);
            return $this->_step($tmp);
        }
        $r = rand(0, 3);
        while ( $this->_targetSteps[$r] == -1) {
            $r = rand(0, 3);
        }
        $nextPos = $this->_targetSteps[$r];
        $isCross = false;
        if ( $this->_grids[$nextPos] != 0)
            $isCross = true;
        if ($r == 0) {
            $this->_grids[$curPos] ^= 1;
            $this->_grids[$nextPos] ^= 4;
        } elseif ($r == 1) {
            $this->_grids[$curPos] ^= 2;
            $this->_grids[$nextPos] ^= 8;
        } elseif ($r == 2) {
            $this->_grids[$curPos] ^= 4;
            $this->_grids[$nextPos] ^= 1;
        } elseif ($r == 3) {
            $this->_grids[$curPos] ^= 8;
            $this->_grids[$nextPos] ^= 2;
        }
        array_push($this->_walkHistory, $curPos);
        return $isCross ? false : $nextPos;
    }
    private function _isRepeating($p) {
        $l = count($this->_walkHistory);
        for ($i = 0; $i < $l; $i ++) {
            if ($this->_walkHistory[$i] == $p) return true;
        }
        $l = count($this->_walkHistory2);
        for ($i = 0; $i < $l; $i ++) {
            if ($this->_walkHistory2[$i] == $p) return true;
        }
        return false;
    }
    private function _getNext0() {
        $l = count($this->_grids);
 
        for ($i = 0; $i <= $l; $i++ ) {
            if ( $this->_grids[$i] == 0) return $i;
        }
        return -1;
    }
    private function _init() {
        $this->_grids = array();
        for ($y = 0; $y < $this->_h; $y ++) {
            for ($x = 0; $x < $this->_w; $x ++) {
                array_push($this->_grids, 0);
            }
        }
        return $this;
    }
}
A*道探しのアルゴリズム
class AStar{
    // A-star
    private $_open;
    private $_closed;
    private $_start;
    private $_end;
    private $_grids;
    private $_w;
    private $_h;
    // Construct
    public function AStar(){
        $this->_w = null;
        $this->_h = null;
        $this->_grids = null;
    }
    public function set($width, $height, $grids) {
        $this->_w = $width;
        $this->_h = $height;
        $this->_grids = $grids;
        return $this;
    }
    //
    public function search($start = false, $end = false) {
        return $this->_search($start, $end);
    }
    /**
    |---------------------------------------------------------------
    | - A-star
    |---------------------------------------------------------------
    */
    public function _search($start = false, $end = false) {
        if ( $start !== false ) $this->_start = $start;
        if ( $end !== false ) $this->_end = $end;
        $_sh = $this->_getH($start);
        $point['i'] = $start;
        $point['f'] = $_sh;
        $point['g'] = 0;
        $point['h'] = $_sh;
        $point['p'] = null;
        $this->_open[] = $point;
        $this->_closed[$start] = $point;
        while ( 0 < count($this->_open) ) {
            $minf = false;
            foreach( $this->_open as $key => $maxNode ) {
                if ( $minf === false || $minf > $maxNode['f'] ) {
                    $minIndex = $key;
                }
            }
            $nowNode = $this->_open[$minIndex];
            unset($this->_open[$minIndex]);
            if ( $nowNode['i'] == $this->_end ) {
                $tp = array();
                while( $nowNode['p'] !== null ) {
                    array_unshift($tp, $nowNode['p']);
                    $nowNode = $this->_closed[$nowNode['p']];
                }
                array_push($tp, $this->_end);
                break;
            }
            $this->_setPoint($nowNode['i']);
        }
        $this->_closed = array();
        $this->_open = array();
        return $tp;
    }
    private function _setPoint($me) {
        $point = $this->_grids[$me];
        //
        if ( $point & 1 ) {
            $next = $me - $this->_w;
            $this->_checkPoint($me, $next);
        }
        if ( $point & 2 ) {
            $next = $me + 1;
            $this->_checkPoint($me, $next);
        }
        if ( $point & 4 ) {
            $next = $me + $this->_w;
            $this->_checkPoint($me, $next);
        }
        if ( $point & 8 ) {
            $next = $me - 1;
            $this->_checkPoint($me, $next);
        }
    }
    private function _checkPoint($pNode, $next) {
        if ( $this->_closed[$next] ) {
            $_g = $this->_closed[$pNode]['g'] + $this->_getG($next);
            if ( $_g < $check['g'] ) {
                $this->_closed[$next]['g'] = $_g;
                $this->_closed[$next]['f'] = $this->_closed[$next]['g'] + $this->_closed[$next]['h'];
                $this->_closed[$next]['p'] = $pNode;
            }
        } else {
            $point['p'] = $pNode;
            $point['h'] = $this->_getH($next);
            $point['g'] = $this->_getG($next);
            $point['f'] = $point['h'] + $point['g'];
            $point['i'] = $next;
            $this->_open[] = $point;
            $this->_closed[$next] = $point;
        }
    }
    private function _getG($point) {
        return abs($this->_start - $point);
    }
    private function _getH($point) {
        return abs($this->_end - $point);
    }
}
完全なインスタンスコードはここをクリックしてダウンロードです。
みんなが直接デモを降りて、効果を見てください。
本論文で述べたように、皆さんのphpプログラムの設計に役に立ちます。