bug fixing

lib/elements/auto_fill.py

@@ -456,7 +456,8 @@ class AutoFill(EmbroideryElement):
                         stitches=path)
                     stitch_groups.append(stitch_group)
             elif self.fill_method == 2:  # Guided Auto Fill
-                lines = get_patterns(self.node, "#inkstitch-guide-line-marker")
+                lines = get_patterns(
+                    self.node, "#inkstitch-guide-line-marker", False, True)
                 lines = lines['stroke_patterns']
                 if not lines or lines[0].is_empty:
                     inkex.errormsg(

lib/patterns.py

@@ -65,7 +65,7 @@ def _apply_fill_patterns(patterns, patches):
             patch.stitches = patch_points
 
 
-def get_patterns(node, marker_id):
+def get_patterns(node, marker_id, get_fills=True, get_strokes=True):
     from .elements import EmbroideryElement
     from .elements.auto_fill import auto_fill
     from .elements.stroke import Stroke
@@ -88,7 +88,7 @@ def get_patterns(node, marker_id):
             for ring in linear_rings:
                 fills.append(shgeo.Polygon(ring))
 
-        if stroke is not None:
+        if get_strokes and stroke is not None:
             stroke_pattern = Stroke(pattern).paths
             line_strings = [shgeo.LineString(path) for path in stroke_pattern]
             strokes.append(shgeo.MultiLineString(line_strings))

lib/stitches/fill.py

@@ -7,6 +7,7 @@ import math
 
 import shapely
 from shapely.geometry.linestring import LineString
+from shapely.ops import linemerge
 from ..svg import PIXELS_PER_MM
 from ..utils import Point as InkstitchPoint
 from ..utils import cache
@@ -108,7 +109,7 @@ def extend_line(line, minx, maxx, miny, maxy):
     point4 = InkstitchPoint(*line.coords[-1])
     new_ending_point = point4+(point4-point3).unit()*length
 
-    line = LineString([new_starting_point.as_tuple()] +
+    return LineString([new_starting_point.as_tuple()] +
                       line.coords[1:-1]+[new_ending_point.as_tuple()])
 
 
@@ -119,7 +120,7 @@ def intersect_region_with_grating_line(shape, line, row_spacing, end_row_spacing
     upper_left = InkstitchPoint(minx, miny)
     rows = []
     # extend the line towards the ends to increase probability that all offsetted curves cross the shape
-    extend_line(line, minx, maxx, miny, maxy)
+    line = extend_line(line, minx, maxx, miny, maxy)
 
     line_offsetted = line
     res = line_offsetted.intersection(shape)
@@ -141,6 +142,17 @@ def intersect_region_with_grating_line(shape, line, row_spacing, end_row_spacing
         else:
             rows.insert(0, runs)
         line_offsetted = line_offsetted.parallel_offset(row_spacing, 'left', 5)
+        if line_offsetted.geom_type == 'MultiLineString':  # if we got multiple lines take the longest
+            lines = linemerge(line_offsetted)
+            lines = list(line_offsetted.geoms)
+            max_length = -1
+            max_length_idx = -1
+            for idx, subline in enumerate(lines):
+                if subline.length > max_length:
+                    max_length = subline.length
+                    max_length_idx = idx
+            line_offsetted = lines[max_length_idx]
+
         if row_spacing < 0:
             line_offsetted.coords = line_offsetted.coords[::-1]
         line_offsetted = line_offsetted.simplify(0.01, False)