Basic canvas parallax

src/page/background/vec3.ts

@@ -0,0 +1,23 @@
+import { Vec2 } from "./vec2";
+
+export class Vec3 {
+  public static readonly Zero = new Vec3(0, 0, 0);
+
+  public static from(vec2: Vec2, z: number): Vec3 {
+    return new Vec3(vec2.x, vec2.y, z);
+  }
+
+  public constructor(
+    public readonly x: number,
+    public readonly y: number,
+    public readonly z: number
+  ) {}
+
+  public add(other: Vec3): Vec3 {
+    return new Vec3(this.x + other.x, this.y + other.y, this.z + other.z);
+  }
+
+  public multiply(other: Vec3): Vec3 {
+    return new Vec3(this.x * other.x, this.y * other.y, this.z * other.z);
+  }
+}