fix handling of self-intersection

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/extensions/convert_to_satin.py b/lib/extensions/convert_to_satin.py
index 53930935..8ec6ab2e 100644
--- a/lib/extensions/convert_to_satin.py
+++ b/lib/extensions/convert_to_satin.py
@@ -5,6 +5,7 @@ import numpy
 from numpy import diff, sign, setdiff1d
 from scipy.signal import argrelmin
 import math
+from copy import deepcopy
 
 from .base import InkstitchExtension
 from ..svg.tags import SVG_PATH_TAG
@@ -40,6 +41,11 @@ class ConvertToSatin(InkstitchExtension):
                 except ValueError:
                     inkex.errormsg(_("Cannot convert %s to a satin column because it intersects itself.  Try breaking it up into multiple paths.") % element.node.get('id'))
 
+                    # revert any changes we've made
+                    self.document = deepcopy(self.original_document)
+
+                    return
+
                 parent.insert(index, self.satin_to_svg_node(rails, rungs, correction_transform))
 
             parent.remove(element.node)