Prepare for upload

1 files changed, 64 insertions, 0 deletions

diff --git a/2026/games/ellg/vector.js b/2026/games/ellg/vector.js
new file mode 100644
index 0000000..cf32d81
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+++ b/2026/games/ellg/vector.js
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+export class Vector {
+  static of([x, y]) {
+    return new Vector(x, y)
+  }
+
+  constructor(x, y) {
+    this.x = x
+    this.y = y
+  }
+
+  add(val) {
+    return new Vector(this.x + val.x, this.y + val.y)
+  }
+
+  subtract(val) {
+    return new Vector(this.x - val.x, this.y - val.y)
+  }
+
+  multiply(scalar) {
+    return new Vector(this.x * scalar, this.y * scalar)
+  }
+
+  divide(scalar) {
+    return new Vector(this.x / scalar, this.y / scalar)
+  }
+
+  dot(other) {
+    return this.x * other.x + this.y * other.y
+  }
+
+  cross(other) {
+    return this.x * other.y - other.x * this.y
+  }
+
+  hadamard(other) {
+    return new Vector(this.x * other.x, this.y * other.y)
+  }
+
+  length() {
+    return Math.sqrt(this.x ** 2 + this.y ** 2)
+  }
+
+  distance(other) {
+    return this.subtract(other).length()
+  }
+
+  normalize() {
+    const length = this.length()
+    if (length === 0) {
+      return new Vector(0, 0)
+    }
+    return new Vector(this.x / length, this.y / length)
+  }
+
+  rotateByRadians(radians) {
+    const cos = Math.cos(radians)
+    const sin = Math.sin(radians)
+    return new Vector(this.x * cos - this.y * sin, this.x * sin + this.y * cos)
+  }
+
+  rotateByDegrees(degrees) {
+    return this.rotateByRadians((degrees * Math.PI) / 180)
+  }
+}