Replace FOV algorithm and add faux-3D

src/engine/datatypes.ts

@@ -70,6 +70,17 @@ export class Point {
   equals(other: Point): boolean {
     return this.x == other.x && this.y == other.y;
   }
+
+  scale(other: Point | Size) {
+    if (other instanceof Point) {
+      return new Point(this.x * other.x, this.y * other.y);
+    }
+    return new Point(this.x * other.w, this.y * other.h);
+  }
+
+  subtract(top: Point): Size {
+    return new Size(this.x - top.x, this.y - top.y);
+  }
 }
 
 export class Size {