add extension to swap satin column rails

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/extensions/flip.py b/lib/extensions/flip.py
new file mode 100644
index 00000000..75d8fe17
--- /dev/null
+++ b/lib/extensions/flip.py
@@ -0,0 +1,34 @@
+import sys
+import inkex
+import cubicsuperpath
+
+from .base import InkstitchExtension
+from ..i18n import _
+from ..elements import SatinColumn
+
+class Flip(InkstitchExtension):
+    def flip(self, satin):
+        csp = cubicsuperpath.parsePath(satin.node.get("d"))
+
+        if len(csp) > 1:
+            # find the rails (the two longest paths) and swap them
+            indices = range(len(csp))
+            indices.sort(key=lambda i: len(csp[i]), reverse=True)
+
+            first = indices[0]
+            second = indices[1]
+            csp[first], csp[second] = csp[second], csp[first]
+
+            satin.node.set("d", cubicsuperpath.formatPath(csp))
+
+    def effect(self):
+        if not self.get_elements():
+            return
+
+        if not self.selected:
+            inkex.errormsg(_("Please select one or more satin columns to flip."))
+            return
+
+        for element in self.elements:
+            if isinstance(element, SatinColumn):
+                self.flip(element)