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<?php |
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declare(strict_types=1); |
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namespace Stu\Lib\Map\VisualPanel\LssBlockade; |
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use InvalidArgumentException; |
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use OutOfBoundsException; |
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class LssBlockadeGrid |
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{ |
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private int $minX; |
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private int $minY; |
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private int $width; |
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private int $height; |
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private int $obsX; |
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private int $obsY; |
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/** @var bool[][] $blocked[$xIdx][$yIdx] */ |
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private array $blocked = []; |
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public function __construct( |
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int $minX, |
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int $maxX, |
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int $minY, |
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int $maxY, |
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int $obsX, |
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int $obsY |
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) { |
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if ($minX > $maxX || $minY > $maxY) { |
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throw new InvalidArgumentException('min‑Koordinaten müssen ≤ max sein.'); |
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} |
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if ($obsX < $minX || $obsX > $maxX || $obsY < $minY || $obsY > $maxY) { |
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throw new InvalidArgumentException('Observer liegt nicht im angegebenen Rechteck.'); |
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} |
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$this->minX = $minX; |
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$this->minY = $minY; |
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$this->width = $maxX - $minX + 1; |
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$this->height = $maxY - $minY + 1; |
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$this->obsX = $obsX; |
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$this->obsY = $obsY; |
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} |
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private function idxX(int $worldX): int |
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{ |
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return $worldX - $this->minX; |
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} |
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private function idxY(int $worldY): int |
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{ |
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return $worldY - $this->minY; |
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} |
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private function inRange(int $x, int $y): bool |
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{ |
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return $x >= $this->minX && $x < $this->minX + $this->width |
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&& $y >= $this->minY && $y < $this->minY + $this->height; |
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} |
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public function setBlocked(int $x, int $y): void |
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{ |
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if (!$this->inRange($x, $y)) { |
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throw new OutOfBoundsException("Koordinate ($x,$y) liegt außerhalb des Grids"); |
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} |
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$this->blocked[$this->idxX($x)][$this->idxY($y)] = true; |
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} |
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public function isVisible(int $x, int $y): bool |
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{ |
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if (!$this->inRange($x, $y)) { |
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return false; |
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} |
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$ixT = $this->idxX($x); |
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$iyT = $this->idxY($y); |
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if (!empty($this->blocked[$ixT][$iyT])) { |
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return false; |
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} |
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$dx = $x - $this->obsX; |
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$dy = $y - $this->obsY; |
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$sx = $dx >= 0 ? 1 : -1; |
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$sy = $dy >= 0 ? 1 : -1; |
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$dx = abs($dx); |
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$dy = abs($dy); |
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$err = $dx - $dy; // Bresenham‑Setup |
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$cx = $this->obsX; |
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$cy = $this->obsY; |
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while ($cx !== $x || $cy !== $y) { |
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$e2 = $err << 1; // = 2*err |
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$nx = $cx; |
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$ny = $cy; |
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if ($e2 > -$dy) { // Schritt in x‑Richtung |
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$err -= $dy; |
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$nx += $sx; |
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} |
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if ($e2 < $dx) { // Schritt in y‑Richtung |
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$err += $dx; |
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$ny += $sy; |
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} |
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if ($cx !== $nx && $cy !== $ny) { |
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$side1Blocked = !empty($this->blocked[$this->idxX($cx)][$this->idxY($ny)]); |
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$side2Blocked = !empty($this->blocked[$this->idxX($nx)][$this->idxY($cy)]); |
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if ($side1Blocked || $side2Blocked) { |
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return false; |
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} |
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} |
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if (!empty($this->blocked[$this->idxX($nx)][$this->idxY($ny)])) { |
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return false; |
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} |
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$cx = $nx; |
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$cy = $ny; |
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} |
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return true; |
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} |
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} |
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st-universe /
core
