ripple: apply stitch length and stagger to grid

lib/stitches/ripple_stitch.py

@@ -246,14 +246,15 @@ def _adjust_helper_lines_for_grid(stroke, helper_lines, skip_start, skip_end):
 
 def _do_grid(stroke, helper_lines, skip_start, skip_end):
     helper_lines = _adjust_helper_lines_for_grid(stroke, helper_lines, skip_start, skip_end)
+    grid = []
     for i, helper in enumerate(helper_lines):
         end = len(helper) - skip_end
         points = helper[skip_start:end]
-        if i % 2 == 0:
-            points.reverse()
         if stroke.reverse:
             points.reverse()
-        yield from points
+        grid.append(points)
+    grid = _get_staggered_stitches(stroke, grid, 0)
+    return grid
 
 
 def _get_guided_helper_lines(stroke, outline, max_distance):