92 lines
1.8 KiB
PHP
92 lines
1.8 KiB
PHP
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<?php
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class Direction
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{
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private static $top = 0;
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private static $bottom = 1;
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private static $left = 2;
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private static $right = 3;
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private $value;
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public $deltaX;
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public $deltaY;
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public function __construct(){
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$this->value = 0;
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}
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private function setValue($value){
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$this->value = $value;
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switch ($value){
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case Direction::$bottom:
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$this->deltaY = -1;
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$this->deltaX = 0;
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break;
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case Direction::$top:
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$this->deltaY = 1;
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$this->deltaX = 0;
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break;
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case Direction::$left:
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$this->deltaY = 0;
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$this->deltaX = -1;
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break;
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case Direction::$right:
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$this->deltaY = 0;
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$this->deltaX = 1;
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break;
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}
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}
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public function __toString(){
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switch ($this->value){
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case Direction::$top:
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return "y+";
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break;
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case Direction::$bottom:
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return "y-";
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break;
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case Direction::$left:
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return "x-";
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break;
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case Direction::$right:
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return "x+";
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break;
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}
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}
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public static function make($str){
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$dir = new Direction();
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switch((string)$str){
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case "x+":
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$dir->setValue(Direction::$right);
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break;
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case "x-":
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$dir->setValue(Direction::$left);
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break;
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case "y+":
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$dir->setValue(Direction::$top);
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break;
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case "y-":
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$dir->setValue(Direction::$bottom);
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break;
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default:
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//error_log("expected 'x+', 'x-', 'y+' or 'y-'". (string)$str."received.");
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return false;
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//throw new InvalidDirectionException("expected 'x+', 'x-', 'y+' or 'y-'". (string)$str."received.");
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break;
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}
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return $dir;
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}
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public function opposite(){
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$opposites = array(
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Direction::$top => Direction::$bottom,
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Direction::$bottom => Direction::$top,
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Direction::$left => Direction::$right,
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Direction::$right => Direction::$left
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);
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$opposite = new Direction();
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$opposite->setValue($opposites[$this->value]);
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return $opposite;
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}
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}
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