1 files changed, 27 insertions, 0 deletions
diff --git a/lib/stitch_plan/stop.py b/lib/stitch_plan/stop.py
new file mode 100644
index 00000000..c5e9f7e4
--- /dev/null
+++ b/lib/stitch_plan/stop.py
@@ -0,0 +1,27 @@
+def process_stop(color_block):
+    """Handle the "stop after" checkbox.
+
+    The user wants the machine to pause after this patch.  This can
+    be useful for applique and similar on multi-needle machines that
+    normally would not stop between colors.
+
+    On such machines, the user assigns needles to the colors in the
+    design before starting stitching.  C01, C02, etc are normal
+    needles, but C00 is special.  For a block of stitches assigned
+    to C00, the machine will continue sewing with the last color it
+    had and pause after it completes the C00 block.
+
+    That means we need to introduce an artificial color change
+    shortly before the current stitch so that the user can set that
+    to C00.  We'll go back 3 stitches and do that:
+    """
+
+    if len(color_block.stitches) >= 3:
+        color_block.stitches[-3].stop = True
+
+    # and also add a color change on this stitch, completing the C00
+    # block:
+
+    color_block.stitches[-1].stop = True
+
+    # reference for the above: https://github.com/lexelby/inkstitch/pull/29#issuecomment-359175447