module exports

geometry/polygon.ts

@@ -20,6 +20,8 @@ export class Polygon {
         color,
       });
     }
+
+    doodler.dot(this.center, { weight: 4, color: "yellow" });
   }
 
   calcCenter() {
@@ -103,6 +105,9 @@ export class Polygon {
       poly.points.push(pt);
     }
     poly.center = poly.calcCenter();
+    for (const p of poly.points) {
+      p.sub(poly.center);
+    }
     return poly;
   }