🚿 refactor + clean up

packages/types/grid.ts

@@ -0,0 +1,54 @@
+export type Color = (1 | 2 | 3 | 4 | 5 | 6) & { _tag: "__Color__" };
+export type Empty = 0 & { _tag: "__Empty__" };
+
+export type Grid = {
+  width: number;
+  height: number;
+  data: Uint8Array;
+};
+
+export const isInside = (grid: Grid, x: number, y: number) =>
+  x >= 0 && y >= 0 && x < grid.width && y < grid.height;
+
+export const isInsideLarge = (grid: Grid, m: number, x: number, y: number) =>
+  x >= -m && y >= -m && x < grid.width + m && y < grid.height + m;
+
+export const copyGrid = ({ width, height, data }: Grid) => ({
+  width,
+  height,
+  data: Uint8Array.from(data),
+});
+
+const getIndex = (grid: Grid, x: number, y: number) => x * grid.height + y;
+
+export const getColor = (grid: Grid, x: number, y: number) =>
+  grid.data[getIndex(grid, x, y)] as Color | Empty;
+
+export const isEmpty = (color: Color | Empty): color is Empty => color === 0;
+
+export const setColor = (
+  grid: Grid,
+  x: number,
+  y: number,
+  color: Color | Empty
+) => {
+  grid.data[getIndex(grid, x, y)] = color || 0;
+};
+
+export const setColorEmpty = (grid: Grid, x: number, y: number) => {
+  setColor(grid, x, y, 0 as Empty);
+};
+
+/**
+ * return true if the grid is empty
+ */
+export const isGridEmpty = (grid: Grid) => grid.data.every((x) => x === 0);
+
+export const gridEquals = (a: Grid, b: Grid) =>
+  a.data.every((_, i) => a.data[i] === b.data[i]);
+
+export const createEmptyGrid = (width: number, height: number) => ({
+  width,
+  height,
+  data: new Uint8Array(width * height),
+});