Add some basic geometry types: Point, Size, Rect

assets/scripts/nethack/dungeon.js

@@ -8,6 +8,73 @@ class Cell {
   }
 }
 
+class Point {
+  x = 0;
+  y = 0;
+
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+}
+
+class Size {
+  width = 0;
+  height = 0;
+
+  constructor(width, height) {
+    this.width = width;
+    this.height = height;
+  }
+}
+
+class Rect {
+  origin = new Point();
+  size = new Size();
+
+  static fromCoordinates(x, y, w, h) {
+    return new Rect(new Point(x, y), new Size(w, h));
+  }
+
+  constructor(origin, size) {
+    this.origin = origin;
+    this.size = size;
+  }
+
+  get minX() { return this.origin.x; }
+  get minY() { return this.origin.y; }
+  get maxX() { return this.origin.x + this.size.width; }
+  get maxY() { return this.origin.y + this.size.height; }
+  get area() { return this.size.width * this.size.height; }
+
+  insetRect(inset) {
+    const twiceInset = 2 * inset;
+
+    return Rect.fromCoordinates(
+      this.origin.x + inset,
+      this.origin.y + inset,
+      this.size.width - twiceInset,
+      this.size.height - twiceInset
+    );
+  }
+
+  intersects(otherRect) {
+    if (otherRect.minX > this.maxX)
+      return false;
+
+    if (otherRect.maxX < this.minX)
+      return false;
+
+    if (otherRect.minY > this.maxY)
+      return false;
+
+    if (otherRect.maxY < this.minY)
+      return false;
+
+    return true;
+  }
+}
+
 class Grid {
   #width;
   #height;