From 978cd94a9ea9b1dab1bcafc3bd68b86f4225d53e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Sat, 22 Jun 2019 18:48:16 +0200
Subject: [PATCH] Boolean: Add check for paths with only one segment

Closes #1351
---
 src/path/PathItem.Boolean.js | 12 ++++++++----
 test/tests/Path_Boolean.js   |  9 ++++++++-
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/src/path/PathItem.Boolean.js b/src/path/PathItem.Boolean.js
index 018555aa..3534a224 100644
--- a/src/path/PathItem.Boolean.js
+++ b/src/path/PathItem.Boolean.js
@@ -715,10 +715,14 @@ PathItem.inject(new function() {
             totalLength = 0,
             winding;
         do {
-            var curve = segment.getCurve(),
-                length = curve.getLength();
-            chain.push({ segment: segment, curve: curve, length: length });
-            totalLength += length;
+            var curve = segment.getCurve();
+            // We can encounter paths with only one segment, which would not
+            // have a curve.
+            if (curve) {
+                var length = curve.getLength();
+                chain.push({ segment: segment, curve: curve, length: length });
+                totalLength += length;
+            }
             segment = segment.getNext();
         } while (segment && !segment._intersection && segment !== start);
         // Determine winding at three points in the chain. If a winding with
diff --git a/test/tests/Path_Boolean.js b/test/tests/Path_Boolean.js
index 764fdcae..0d448243 100644
--- a/test/tests/Path_Boolean.js
+++ b/test/tests/Path_Boolean.js
@@ -1214,4 +1214,11 @@ test('#1419', function() {
     });
     var result = 'M-50,0c0,-27.61424 22.38576,-50 50,-50c7.33673,0 14.30439,1.5802 20.58119,4.41881c-7.84546,-17.34804 -25.30368,-29.41881 -45.58119,-29.41881c-27.61424,0 -50,22.38576 -50,50c0,20.27751 12.07077,37.73573 29.41881,45.58119c-2.83861,-6.2768 -4.41881,-13.24446 -4.41881,-20.58119zM50,0c0,27.61424 -22.38576,50 -50,50c-20.27751,0 -37.73573,-12.07077 -45.58119,-29.41881c6.2768,2.83861 13.24446,4.41881 20.58119,4.41881c27.61424,0 50,-22.38576 50,-50c0,-7.33673 -1.5802,-14.30439 -4.41881,-20.58119c17.34804,7.84546 29.41881,25.30368 29.41881,45.58119z';
     compareBoolean(circle1.exclude(circle2), result);
-})
+});
+
+test('#1351', function() {
+    var path1 = new CompoundPath(new Path([10, 10], [100, 100]), new Path([150, 25]));
+    var path2 = new Path([20, 80], [80, 20]);
+    var result = 'M10,10l40,40l50,50';
+    compareBoolean(path1.unite(path2), result);
+});