Replace map generator again

src/engine/datatypes.ts

@@ -55,6 +55,10 @@ export class Point {
     this.y = y;
   }
 
+  toString(): string {
+    return `${this.x},${this.y}`
+  }
+
   offset(other: Point | Size): Point {
     if (other instanceof Point) {
       return new Point(this.x + other.x, this.y + other.y);
@@ -81,6 +85,10 @@ export class Point {
   subtract(top: Point): Size {
     return new Size(this.x - top.x, this.y - top.y);
   }
+
+  manhattan(other: Point) {
+    return Math.abs(this.x - other.x) + Math.abs(this.y - other.y);
+  }
 }
 
 export class Size {
@@ -121,6 +129,20 @@ export class Rect {
   contains(other: Point) {
     return (other.x >= this.top.x && other.y >= this.top.y && other.x < this.top.x + this.size.w && other.y < this.top.y + this.size.h);
   }
+
+  overlaps(other: Rect) {
+    let ax0 = this.top.x;
+    let ay0 = this.top.y;
+    let ax1 = ax0 + this.size.w;
+    let ay1 = ay0 + this.size.h;
+    let bx0 = other.top.x;
+    let by0 = other.top.y;
+    let bx1 = bx0 + other.size.w;
+    let by1 = by0 + other.size.h;
+
+    let noOverlap = ax0 > bx1 || bx0 > ax1 || ay0 > by1 || by0 > ay1;
+    return !noOverlap;
+  }
 }
 
 export class Grid<T> {
@@ -201,7 +223,7 @@ export class Grid<T> {
       (position.x < 0 || position.x >= this.size.w || Math.floor(position.x) != position.x) ||
       (position.y < 0 || position.y >= this.size.h || Math.floor(position.y) != position.y)
     ) {
-      throw `invalid position for ${this.size}: ${position}`
+      throw new Error(`invalid position for ${this.size}: ${position}`)
     }
   }