initial commit

app/Game/Vector2.php

@@ -0,0 +1,91 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Game;
+
+final class Vector2
+{
+    public function __construct(
+        public float $x,
+        public float $y,
+    ) {}
+
+    public static function zero(): self
+    {
+        return new self(0.0, 0.0);
+    }
+
+    public function mulS(float $scalar): self
+    {
+        return new self($this->x * $scalar, $this->y * $scalar);
+    }
+
+    public function mulV(self $v): self
+    {
+        return new self($this->x * $v->x, $this->y * $v->y);
+    }
+
+    public function divS(float $scalar): self
+    {
+        return new self($this->x / $scalar, $this->y / $scalar);
+    }
+
+    public function addS(float $scalar): self
+    {
+        return new self($this->x + $scalar, $this->y + $scalar);
+    }
+
+    public function addV(self $v): self
+    {
+        return new self($this->x + $v->x, $this->y + $v->y);
+    }
+
+    public function subS(float $scalar): self
+    {
+        return new self($this->x - $scalar, $this->y - $scalar);
+    }
+
+    public function subV(self $v): self
+    {
+        return new self($this->x - $v->x, $this->y - $v->y);
+    }
+
+    public function dot(self $v): float
+    {
+        return $this->x * $v->x + $this->y * $v->y;
+    }
+
+    public function abs(): self
+    {
+        return new self(abs($this->x), abs($this->y));
+    }
+
+    public function length(): float
+    {
+        return sqrt($this->dot($this));
+    }
+
+    public function lengthSquared(): float
+    {
+        return $this->dot($this);
+    }
+
+    public function normalize(): self
+    {
+        $length = $this->length();
+        if ($length < 1.0e-9) {
+            return new self(0.0, 0.0);
+        }
+
+        return new self($this->x / $length, $this->y / $length);
+    }
+
+    public function rotate(float $angle): self
+    {
+        $cos = cos($angle);
+        $sin = sin($angle);
+
+        return new self($this->x * $cos - $this->y * $sin, $this->x * $sin + $this->y * $cos);
+    }
+}