From 7a67de3aa992e8cf9b9110832f6ec2a55b378df7 Mon Sep 17 00:00:00 2001
From: Erik Demaine <edemaine@mit.edu>
Date: Fri, 14 Dec 2018 09:12:53 -0500
Subject: Bug fix

---
 src/types/PointArray.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/types/PointArray.js b/src/types/PointArray.js
index 4117233..53ac425 100644
--- a/src/types/PointArray.js
+++ b/src/types/PointArray.js
@@ -73,12 +73,14 @@ extend(PointArray, {
 
   // transform points with matrix (similar to Point.transform)
   transform (m) {
-    let points = []
+    const points = []
 
     for (let point of this) {
       // Perform the matrix multiplication
-      points.push([m.a * point.x + m.c * point.y + m.e,
-        m.b * point.x + m.d * point.y + m.f])
+      points.push([
+        m.a * point[0] + m.c * point[1] + m.e,
+        m.b * point[0] + m.d * point[1] + m.f
+      ])
     }
 
     // Return the required point
-- 
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