Make overlay

src/2DArray.ts

@@ -0,0 +1,25 @@
+export class Array2D<V = any> {
+    public array:V[] = [];
+    constructor(defaultValue: V, private width: number, height: number) {
+        this.array = new Array(width * height);
+        this.array.fill(defaultValue); 
+    }
+    at(x: number, y: number){
+        return y * this.width + x;
+    }
+    set(x: number, y: number, value: V) {
+        this.array[this.at(x, y)] = value;
+    }
+    get(x: number, y: number) {
+        return this.array[this.at(x, y)];
+    }
+    static from<V>(array: V[][], width: number, height: number) {
+        const arr = new Array2D(array[0][0]!, width, height);
+        for (let y = 0; y < array.length; y++) {
+            for (let x = 0; x < array[y].length; x++) {
+                arr.set(x, y, array[y][x]!);
+            }
+        }
+        return arr;
+    }
+}