Add input handling

frontend/src/scripts/math/line.ts

@@ -0,0 +1,7 @@
+import { Vec2 } from './vec2';
+
+export interface Line {
+  a: Vec2;
+  b: Vec2;
+  normal: Vec2;
+}

frontend/src/scripts/math/vec2.ts

@@ -0,0 +1,27 @@
+import { Typed } from '../transport/serializable';
+
+export class Vec2 extends Typed {
+  public constructor(public x: number = 0.0, public y: number = null) {
+    super();
+
+    if (this.y === null) {
+      this.y = this.x;
+    }
+  }
+
+  public scale(scalar: number): Vec2 {
+    return new Vec2(this.x * scalar, this.y * scalar);
+  }
+
+  public add(other: Vec2): Vec2 {
+    return new Vec2(this.x + other.x, this.y + other.y);
+  }
+
+  public subtract(other: Vec2): Vec2 {
+    return new Vec2(this.x - other.x, this.y - other.y);
+  }
+
+  public get list(): [number, number] {
+    return [this.x, this.y];
+  }
+}