<?phpnamespace App\Entity;use App\Arcade\Artwork;use App\World\Round;use App\World\Terrain;use JumPHP\Entity\Entity;use JumPHP\Renderer\Renderer;/** * An enemy of the island, placed by the round's map. Walkers patrol their platform and turn back at * its edges; flyers drift diagonally. Hit by a rainbow, an enemy spins away and lands as an item. */final class Enemy extends Entity{ private const WALK_SPEED = 28.0; private const FLY_SPEED = 26.0; private const GRAVITY = 600.0; private const SPIN_TIME = 0.6; private float $time = 0.0; private float $homeY; /** Spinning after a hit: the item it becomes (-1 while alive). */ public int $dropsItem = -1; /** (x, y): top-left corner, like the placements of the map. @param int[] $frames its animation in the island's sprite sheet */ public function __construct(float $x, float $y, private array $frames, private bool $flies, bool $flip, private Artwork $artwork, private int $island) { [$this->width, $this->height] = $artwork->frameSize($island, $frames[0]); $this->x = $x; $this->y = $y; $this->homeY = $this->y; $this->facing = $flip ? 'left' : 'right'; $this->vx = ($flip ? -1 : 1) * ($flies ? self::FLY_SPEED : self::WALK_SPEED); $this->vy = $flies ? self::FLY_SPEED : 0; $this->state = $flies ? 'fly' : 'walk'; } public function isSpinning(): bool { return $this->state === 'spin'; } /** Can hurt Bub / be hit by a rainbow. */ public function isHarmful(): bool { return !$this->dead && !$this->isSpinning(); } public function hitBox(): array { return ['x' => $this->x + 3, 'y' => $this->y + 3, 'width' => $this->width - 6, 'height' => $this->height - 4]; } /** Knocked out: it flies away from the rainbow, then becomes item $item. */ public function knockOut(float $fromX, int $item): void { $this->state = 'spin'; $this->time = 0.0; $this->dropsItem = $item; $this->vx = ($this->centerX() < $fromX ? -1 : 1) * 70; $this->vy = -180; } /** Returns the Item it turned into when its spin ends. */ public function step(float $dt, Terrain $terrain): ?Item { $this->time += $dt; if ($this->isSpinning()) { $this->vy += self::GRAVITY * $dt; $this->x = max(0.0, min(Round::WIDTH - $this->width, $this->x + $this->vx * $dt)); $feet = $this->y + $this->height; $ground = $this->vy > 0 ? $terrain->surface($this->centerX(), $feet, $feet + $this->vy * $dt, false) : null; $this->y += $this->vy * $dt; if ($this->time > self::SPIN_TIME && ($ground !== null || $this->time > 3)) { $this->kill(); return new Item($this->centerX() - 8, ($ground ?? $this->y + $this->height) - 16, $this->dropsItem); } return null; } if ($this->flies) { $this->fly($dt); } else { $this->walk($dt, $terrain); } return null; } private function fly(float $dt): void { $this->x += $this->vx * $dt; $this->y += $this->vy * $dt; if ($this->x < 0 || $this->x > Round::WIDTH - $this->width) { $this->x = max(0.0, min(Round::WIDTH - $this->width, $this->x)); $this->vx = -$this->vx; } if (abs($this->y - $this->homeY) > 40) { $this->y = $this->homeY + ($this->y > $this->homeY ? 40 : -40); $this->vy = -$this->vy; } $this->facing = $this->vx < 0 ? 'left' : 'right'; } private function walk(float $dt, Terrain $terrain): void { $feet = $this->y + $this->height; if ($this->state === 'fall') { $this->vy = min(240.0, $this->vy + self::GRAVITY * $dt); $ground = $terrain->surface($this->centerX(), $feet - 0.5, $feet + $this->vy * $dt, false); if ($ground === null) { $this->y += $this->vy * $dt; return; } $this->y = $ground - $this->height; $this->vy = 0; $this->state = 'walk'; } $x = $this->x + $this->vx * $dt; $front = $this->vx > 0 ? $x + $this->width : $x; $edge = $terrain->surface($front, $feet - 4.5, $feet + 4, false) === null; if ($x < 0 || $x > Round::WIDTH - $this->width || $edge || $terrain->isWall($front, $feet)) { $this->vx = -$this->vx; } else { $this->x = $x; } $this->facing = $this->vx < 0 ? 'left' : 'right'; if ($terrain->surface($this->centerX(), $feet - 4.5, $feet + 4, false) === null) { $this->state = 'fall'; } } public function render(Renderer $r, float $camX = 0, float $camY = 0): void { } public function draw(Renderer $r, float $camY): void { if ($this->isSpinning()) { $frame = Artwork::FRAMES_SPIN[(int)($this->time * 16) % 4]; } else { $frame = $this->frames[(int)($this->time * 6) % count($this->frames)]; } $this->artwork->drawFrame($r, $this->island, $frame, $this->x, $this->y - $camY, $this->facing === 'left'); }}