114 lines
2.8 KiB
PHP
114 lines
2.8 KiB
PHP
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<?php
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abstract class Entity
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{
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/**
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* Different visibility types for entities
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*/
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const VSB_INVISIBLE = 0;
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const VSB_VISIBLE = 1;
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const VSB_SEETHROUGH = 2;
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protected $place;
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protected $seenCells = array();
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public function __toString()
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{
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return static::CHAR;
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}
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static public function getChar()
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{
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return static::CHAR;
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}
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public function getVisibility()
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{
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return static::VISIBILITY;
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}
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public function setPlace(Place $place)
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{
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// Remove from old place if exists
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if ($this->place !== null)
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$this->place->getLevel()->removeEntity($this->place->getCoord());
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$this->place = $place;
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if ($this->place !== null)
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$this->place->getLevel()->insertEntity($this->place->getCoord(), $this);
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}
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public function getPlace()
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{
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return $this->place;
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}
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public function drawPath(Entity $target, $callback)
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{
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$targetX = $target->getPlace()->getCoord()->x;
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$targetY = $target->getPlace()->getCoord()->y;
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$startX = $this->getPlace()->getCoord()->x;
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$startY = $this->getPlace()->getCoord()->y;
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if ($startX == $targetX && $startY == $targetY)
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return;
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$diffX = $targetX - $startX;
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$diffY = $targetY - $startY;
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$step = max(abs($diffX), abs($diffY));
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$stepX = $diffX / $step;
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$stepY = $diffY / $step;
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if ($stepX != 0)
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$steps = floor($diffX / $stepX);
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else
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$steps = floor($diffY / $stepY);
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$x = $startX;
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$y = $startY;
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$i = 0;
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do
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{
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$x += $stepX;
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$y += $stepY;
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++$i;
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if (!$callback(new Coord(floor($x), floor($y))))
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return;
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} while ((floor($x) != $targetX || floor($y) != $targetY)
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&& $i < $steps);
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}
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public function canSee(Entity $target)
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{
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// Check if already marked as seen
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if (isset($this->seenCells[$target->getPlace()->getCoord()->x][$target->getPlace()->getCoord()->y]))
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return true;
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// Check distance
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if ($this->getSight() < $this->getPlace()->getCoord()->getDistance($target->getPlace()->getCoord()))
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return false;
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// Check each cell on the way for opaque objects
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$level = $this->getPlace()->getLevel();
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$return = true;
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$seenCells =& $this->seenCells;
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$this->drawPath($target, function(Coord $coord) use (&$return, $level, $target,
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&$seenCells)
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{
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$obj = $level->whatsAt($coord);
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if ($obj !== null && $obj != $target && $obj->getVisibility() == Entity::VSB_VISIBLE)
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{
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$return = false;
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return false;
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}
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$seenCells[$coord->x][$coord->y] = true;
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return true;
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});
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return $return;
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}
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}
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