initial commit

app/Game/GameObject.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Game;
+
+abstract class GameObject
+{
+    private static int $nextId = 0;
+
+    public readonly int $eid;
+
+    public Vector2 $pos;
+
+    public Vector2 $velocity;
+
+    public float $width;
+
+    public float $height;
+
+    public function __construct(float $x = 0.0, float $y = 0.0)
+    {
+        $this->eid = ++self::$nextId;
+        $this->pos = new Vector2($x, $y);
+        $this->velocity = Vector2::zero();
+        $this->width = 0.0;
+        $this->height = 0.0;
+    }
+
+    public function update(float $dt): void
+    {
+        $this->move($dt);
+    }
+
+    /** Integrate position from velocity; used directly by subclasses that override update(). */
+    public function move(float $dt): void
+    {
+        $this->pos = new Vector2(
+            $this->pos->x + $this->velocity->x * $dt,
+            $this->pos->y + $this->velocity->y * $dt,
+        );
+    }
+
+    public function intersects(GameObject $other): bool
+    {
+        return abs($this->pos->x - $other->pos->x) * 2.0 < $this->width + $other->width
+            && abs($this->pos->y - $other->pos->y) * 2.0 < $this->height + $other->height;
+    }
+
+    public function removeFrom(EntityList $container): void
+    {
+        $container->remove($this);
+    }
+
+    abstract public function kind(): string;
+}