Merge pull request #1803 from inkstitch/lexelby/smoothing

Meander fill

167 files changed, 4681 insertions, 45 deletions

diff --git a/Makefile b/Makefile
index c81e2a98..64d6bed8 100644
--- a/Makefile
+++ b/Makefile
@@ -19,11 +19,12 @@ messages.po: inx
 	sed -i 's/charset=CHARSET/charset=UTF-8/g' messages-inx.po
 	bin/pyembroidery-gettext > pyembroidery-format-descriptions.py
 	bin/inkstitch-fonts-gettext > inkstitch-fonts-metadata.py
+	bin/inkstitch-tiles-gettext > inkstitch-tiles-metadata.py
 	# After the inx files are finished building, we don't need the src/ folder anymore.
 	# We don't want babel to grab possible translation strings from that folder, so let's remove it
 	rm -rf src/
 	pybabel extract -o messages-babel.po -F babel.conf --add-location=full --add-comments=l10n,L10n,L10N --sort-by-file --strip-comments -k N_ -k '$$gettext' .
-	rm pyembroidery-format-descriptions.py inkstitch-fonts-metadata.py
+	rm pyembroidery-format-descriptions.py inkstitch-fonts-metadata.py inkstitch-tiles-metadata.py
 	cd electron && yarn --link-duplicates --pure-lockfile
 	find electron/src -name '*.html' -o -name '*.js' -o -name '*.vue' | xargs electron/node_modules/.bin/gettext-extract --quiet --attribute v-translate --output messages-vue.po
 	msgcat -o messages.po messages-babel.po messages-vue.po messages-inx.po
diff --git a/bin/inkstitch-tiles-gettext b/bin/inkstitch-tiles-gettext
new file mode 100755
index 00000000..e125dabf
--- /dev/null
+++ b/bin/inkstitch-tiles-gettext
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+import os
+import json
+
+# generate fake python code containing the names and descriptions of all built-
+# in tiles as gettext calls so that pybabel will extract them into messages.po
+
+tiles_dir = os.path.join(os.path.dirname(__file__), "..", "tiles")
+
+for tile in sorted(os.listdir(tiles_dir)):
+    with open(os.path.join(tiles_dir, tile, "tile.json")) as tile_json:
+        tile_metadata = json.load(tile_json)
+
+        print("# L10N name of tile in tiles/%s" % tile)
+        print("_(%s)" % repr(tile_metadata.get("name", "")))
+
+        if tile_metadata.get("description", ""):
+            print("# L10N description of tile in tiles/%s" % tile)
+            print("_(%s)" % repr(tile_metadata.get("description", "")))
+
diff --git a/lib/debug.py b/lib/debug.py
index 0d6af104..4751e6af 100644
--- a/lib/debug.py
+++ b/lib/debug.py
@@ -21,12 +21,46 @@ from .svg.tags import INKSCAPE_GROUPMODE, INKSCAPE_LABEL
 def check_enabled(func):
     def decorated(self, *args, **kwargs):
         if self.enabled:
-            func(self, *args, **kwargs)
+            return func(self, *args, **kwargs)
+
+    return decorated
+
+
+def _unwrap(arg):
+    if callable(arg):
+        return arg()
+    else:
+        return arg
+
+
+def unwrap_arguments(func):
+    def decorated(self, *args, **kwargs):
+        unwrapped_args = [_unwrap(arg) for arg in args]
+        unwrapped_kwargs = {name: _unwrap(value) for name, value in kwargs.items()}
+
+        return func(self, *unwrapped_args, **unwrapped_kwargs)
 
     return decorated
 
 
 class Debug(object):
+    """Tools to help debug Ink/Stitch
+
+    This class contains methods to log strings and SVG elements.  Strings are
+    logged to debug.log, and SVG elements are stored in debug.svg to aid in
+    debugging stitch algorithms.
+
+    All functionality is gated by self.enabled.  If debugging is not enabled,
+    then debug calls will consume very few resources.  Any method argument
+    can be a callable, in which case it is called and the return value is
+    logged instead.  This way one can log potentially expensive expressions
+    by wrapping them in a lambda:
+
+    debug.log(lambda: some_expensive_function(some_argument))
+
+    The lambda is only called if debugging is enabled.
+    """
+
     def __init__(self):
         self.enabled = False
         self.last_log_time = None
@@ -145,6 +179,7 @@ class Debug(object):
         tree.write(debug_svg)
 
     @check_enabled
+    @unwrap_arguments
     def add_layer(self, name="Debug"):
         layer = etree.Element("g", {
             INKSCAPE_GROUPMODE: "layer",
@@ -155,6 +190,7 @@ class Debug(object):
         self.current_layer = layer
 
     @check_enabled
+    @unwrap_arguments
     def open_group(self, name="Group"):
         group = etree.Element("g", {
             INKSCAPE_LABEL: name
@@ -164,11 +200,13 @@ class Debug(object):
         self.group_stack.append(group)
 
     @check_enabled
+    @unwrap_arguments
     def close_group(self):
         if self.group_stack:
             self.group_stack.pop()
 
     @check_enabled
+    @unwrap_arguments
     def log(self, message, *args):
         if self.last_log_time:
             message = "(+%s) %s" % (datetime.now() - self.last_log_time, message)
@@ -201,6 +239,7 @@ class Debug(object):
         return decorated
 
     @check_enabled
+    @unwrap_arguments
     def log_svg_element(self, element):
         if self.current_layer is None:
             self.add_layer()
@@ -211,11 +250,13 @@ class Debug(object):
             self.current_layer.append(element)
 
     @check_enabled
+    @unwrap_arguments
     def log_line_string(self, line_string, name=None, color=None):
         """Add a Shapely LineString to the SVG log."""
         self.log_line_strings([line_string], name, color)
 
     @check_enabled
+    @unwrap_arguments
     def log_line_strings(self, line_strings, name=None, color=None):
         path = line_strings_to_path(line_strings)
         path.set('style', str(inkex.Style({"stroke": color or "#000000", "stroke-width": "0.3", "fill": None})))
@@ -226,6 +267,7 @@ class Debug(object):
         self.log_svg_element(path)
 
     @check_enabled
+    @unwrap_arguments
     def log_line(self, start, end, name="line", color=None):
         self.log_svg_element(etree.Element("path", {
             "d": "M%s,%s %s,%s" % (start + end),
@@ -234,6 +276,17 @@ class Debug(object):
         }))
 
     @check_enabled
+    @unwrap_arguments
+    def log_point(self, point, name="point", color=None):
+        self.log_svg_element(etree.Element("circle", {
+            "cx": str(point.x),
+            "cy": str(point.y),
+            "r": "1",
+            "style": str(inkex.Style({"fill": "#000000"})),
+        }))
+
+    @check_enabled
+    @unwrap_arguments
     def log_graph(self, graph, name="Graph", color=None):
         d = ""
 
diff --git a/lib/elements/fill_stitch.py b/lib/elements/fill_stitch.py
index 77b4ac7c..c6762ad1 100644
--- a/lib/elements/fill_stitch.py
+++ b/lib/elements/fill_stitch.py
@@ -17,8 +17,10 @@ from ..i18n import _
 from ..marker import get_marker_elements
 from ..stitch_plan import StitchGroup
 from ..stitches import auto_fill, contour_fill, guided_fill, legacy_fill
+from ..stitches.meander_fill import meander_fill
 from ..svg import PIXELS_PER_MM
 from ..svg.tags import INKSCAPE_LABEL
+from .. import tiles
 from ..utils import cache, version
 from .element import EmbroideryElement, param
 from .validation import ValidationError, ValidationWarning
@@ -107,7 +109,7 @@ class FillStitch(EmbroideryElement):
 
     @property
     @param('fill_method', _('Fill method'), type='dropdown', default=0,
-           options=[_("Auto Fill"), _("Contour Fill"), _("Guided Fill"), _("Legacy Fill")], sort_index=2)
+           options=[_("Auto Fill"), _("Contour Fill"), _("Guided Fill"), _("Legacy Fill"), _("Meander Fill")], sort_index=2)
     def fill_method(self):
         return self.get_int_param('fill_method', 0)
 
@@ -138,11 +140,37 @@ class FillStitch(EmbroideryElement):
         return self.get_boolean_param('avoid_self_crossing', False)
 
     @property
+    @param('smoothness_mm', _('Smoothness'),
+           tooltip=_(
+               'Smooth the stitch path.  Smoothness limits how far the smoothed stitch path ' +
+               'is allowed to deviate from the original path.  Try low numbers like 0.2.  ' +
+               'Hint: a lower running stitch tolerance may be needed too.'
+           ),
+           type='integer',
+           unit='mm',
+           default=0,
+           select_items=[('fill_method', 1), ('fill_method', 4)],
+           sort_index=5)
+    def smoothness(self):
+        return self.get_float_param('smoothness_mm', 0)
+
+    @property
     @param('clockwise', _('Clockwise'), type='boolean', default=True, select_items=[('fill_method', 1)], sort_index=5)
     def clockwise(self):
         return self.get_boolean_param('clockwise', True)
 
     @property
+    @param('meander_pattern', _('Meander Pattern'), type='combo', default=0,
+           options=sorted(tiles.all_tiles()), select_items=[('fill_method', 4)], sort_index=3)
+    def meander_pattern(self):
+        return self.get_param('meander_pattern', None)
+
+    @property
+    @param('meander_scale_percent', _('Meander pattern scale'), type='float', unit="%", default=100, select_items=[('fill_method', 4)], sort_index=4)
+    def meander_scale(self):
+        return self.get_split_float_param('meander_scale_percent', (100, 100)) / 100
+
+    @property
     @param('angle',
            _('Angle of lines of stitches'),
            tooltip=_('The angle increases in a counter-clockwise direction.  0 is horizontal.  Negative angles are allowed.'),
@@ -194,6 +222,7 @@ class FillStitch(EmbroideryElement):
            unit='mm',
            sort_index=6,
            type='float',
+           select_items=[('fill_method', 0), ('fill_method', 1), ('fill_method', 2), ('fill_method', 3)],
            default=0.25)
     def row_spacing(self):
         return max(self.get_float_param("row_spacing_mm", 0.25), 0.1 * PIXELS_PER_MM)
@@ -210,6 +239,7 @@ class FillStitch(EmbroideryElement):
            unit='mm',
            sort_index=6,
            type='float',
+           select_items=[('fill_method', 0), ('fill_method', 1), ('fill_method', 2), ('fill_method', 3)],
            default=3.0)
     def max_stitch_length(self):
         return max(self.get_float_param("max_stitch_length_mm", 3.0), 0.1 * PIXELS_PER_MM)
@@ -375,12 +405,13 @@ class FillStitch(EmbroideryElement):
 
     @property
     @param('running_stitch_length_mm',
-           _('Running stitch length (traversal between sections)'),
-           tooltip=_('Length of stitches around the outline of the fill region used when moving from section to section.'),
+           _('Running stitch length'),
+           tooltip=_(
+               'Length of stitches around the outline of the fill region used when moving from section to section.  Also used for meander fill.'),
            unit='mm',
            type='float',
            default=1.5,
-           select_items=[('fill_method', 0), ('fill_method', 2)],
+           select_items=[('fill_method', 0), ('fill_method', 2), ('fill_method', 4)],
            sort_index=6)
     def running_stitch_length(self):
         return max(self.get_float_param("running_stitch_length_mm", 1.5), 0.01)
@@ -475,12 +506,12 @@ class FillStitch(EmbroideryElement):
     @property
     @param('expand_mm',
            _('Expand'),
-           tooltip=_('Expand the shape before fill stitching, to compensate for gaps between shapes.'),
+           tooltip=_('Expand the shape before fill stitching, to compensate for gaps between shapes.  Negative values contract instead.'),
            unit='mm',
            type='float',
            default=0,
            sort_index=5,
-           select_items=[('fill_method', 0), ('fill_method', 2)])
+           select_items=[('fill_method', 0), ('fill_method', 2), ('fill_method', 4)])
     def expand(self):
         return self.get_float_param('expand_mm', 0)
 
@@ -571,13 +602,15 @@ class FillStitch(EmbroideryElement):
                             stitch_groups.extend(underlay_stitch_groups)
 
                     fill_shapes = self.fill_shape(shape)
-                    for fill_shape in fill_shapes.geoms:
+                    for i, fill_shape in enumerate(fill_shapes.geoms):
                         if self.fill_method == 0:
                             stitch_groups.extend(self.do_auto_fill(fill_shape, previous_stitch_group, start, end))
                         if self.fill_method == 1:
                             stitch_groups.extend(self.do_contour_fill(fill_shape, previous_stitch_group, start))
                         elif self.fill_method == 2:
                             stitch_groups.extend(self.do_guided_fill(fill_shape, previous_stitch_group, start, end))
+                        elif self.fill_method == 4:
+                            stitch_groups.extend(self.do_meander_fill(fill_shape, i, start, end))
                 except ExitThread:
                     raise
                 except Exception:
@@ -651,9 +684,11 @@ class FillStitch(EmbroideryElement):
         if self.contour_strategy == 0:
             stitches = contour_fill.inner_to_outer(
                 tree,
+                polygon,
                 self.row_spacing,
                 self.max_stitch_length,
                 self.running_stitch_tolerance,
+                self.smoothness,
                 starting_point,
                 self.avoid_self_crossing
             )
@@ -707,6 +742,13 @@ class FillStitch(EmbroideryElement):
             ))
         return [stitch_group]
 
+    def do_meander_fill(self, shape, i, starting_point, ending_point):
+        stitch_group = StitchGroup(
+            color=self.color,
+            tags=("meander_fill", "meander_fill_top"),
+            stitches=meander_fill(self, shape, i, starting_point, ending_point))
+        return [stitch_group]
+
     @cache
     def _get_guide_lines(self, multiple=False):
         guide_lines = get_marker_elements(self.node, "guide-line", False, True)
diff --git a/lib/elements/satin_column.py b/lib/elements/satin_column.py
index 4028ad27..eba63c6c 100644
--- a/lib/elements/satin_column.py
+++ b/lib/elements/satin_column.py
@@ -783,7 +783,7 @@ class SatinColumn(EmbroideryElement):
 
         # pre-cache ramdomised parameters to avoid property calls in loop
         if use_random:
-            seed = prng.joinArgs(self.random_seed, "satin-points")
+            seed = prng.join_args(self.random_seed, "satin-points")
             offset_proportional_min = np.array(offset_proportional) - self.random_width_decrease
             offset_range = (self.random_width_increase + self.random_width_decrease)
             spacing_sigma = spacing * self.random_zigzag_spacing
@@ -857,7 +857,7 @@ class SatinColumn(EmbroideryElement):
 
                 if to_travel <= 0:
                     if use_random:
-                        roll = prng.uniformFloats(seed, cycle)
+                        roll = prng.uniform_floats(seed, cycle)
                         offset_prop = offset_proportional_min + roll[0:2] * offset_range
                         to_travel = spacing + ((roll[2] - 0.5) * 2 * spacing_sigma)
                     else:
@@ -987,7 +987,7 @@ class SatinColumn(EmbroideryElement):
             if last_point is not None:
                 split_points, _ = self.get_split_points(
                     last_point, a, last_short_point, a_short, max_stitch_length, last_count,
-                    length_sigma, random_phase, min_split_length, prng.joinArgs(seed, 'satin-split', 2*i))
+                    length_sigma, random_phase, min_split_length, prng.join_args(seed, 'satin-split', 2 * i))
                 patch.add_stitches(split_points, ("satin_column", "satin_split_stitch"))
 
             patch.add_stitch(a_short)
@@ -995,7 +995,7 @@ class SatinColumn(EmbroideryElement):
 
             split_points, last_count = self.get_split_points(
                 a, b, a_short, b_short, max_stitch_length, None,
-                length_sigma, random_phase, min_split_length, prng.joinArgs(seed, 'satin-split', 2*i+1))
+                length_sigma, random_phase, min_split_length, prng.join_args(seed, 'satin-split', 2 * i + 1))
             patch.add_stitches(split_points, ("satin_column", "satin_split_stitch"))
 
             patch.add_stitch(b_short)
diff --git a/lib/extensions/params.py b/lib/extensions/params.py
index 1262ceb6..e342c592 100644
--- a/lib/extensions/params.py
+++ b/lib/extensions/params.py
@@ -17,7 +17,7 @@ import wx
 from wx.lib.scrolledpanel import ScrolledPanel
 
 from ..commands import is_command, is_command_symbol
-from ..elements import (FillStitch, Clone, EmbroideryElement, Polyline,
+from ..elements import (Clone, EmbroideryElement, FillStitch, Polyline,
                         SatinColumn, Stroke)
 from ..elements.clone import is_clone
 from ..gui import PresetsPanel, SimulatorPreview, WarningPanel
@@ -129,9 +129,12 @@ class ParamsTab(ScrolledPanel):
         if event:
             event.Skip()
 
-    def update_choice_state(self, event=None):
+    def update_choice_state(self, event=None, combo=False):
         input = event.GetEventObject()
-        selection = input.GetSelection()
+        if combo:
+            selection = input.GetClientData(input.GetSelection()).id
+        else:
+            selection = input.GetSelection()
 
         param = self.inputs_to_params[input]
 
@@ -143,6 +146,15 @@ class ParamsTab(ScrolledPanel):
         if event:
             event.Skip()
 
+    def update_combo_state(self, event=None):
+        self.update_choice_state(event, True)
+
+    def get_combo_value_index(self, param, options):
+        for option in options:
+            if option.id == param:
+                return options.index(option)
+        return 0
+
     def pair_changed(self, value):
         new_value = not value
 
@@ -187,11 +199,15 @@ class ParamsTab(ScrolledPanel):
 
         for name, input in self.param_inputs.items():
             if input in self.changed_inputs and input != self.toggle_checkbox:
-                try:
-                    values[name] = input.GetValue()
-                except AttributeError:
-                    # dropdown
+                # there are two types of combo boxes:
+                # 1. multiple values for the same param on selected elements - 2. param type
+                # multiple values will be handled with the GetValue() method
+                if name in self.dict_of_choices and self.dict_of_choices[name]['param'].type == 'combo':
+                    values[name] = input.GetClientData(input.GetSelection()).id
+                elif isinstance(input, wx.Choice):
                     values[name] = input.GetSelection()
+                else:
+                    values[name] = input.GetValue()
 
         return values
 
@@ -234,12 +250,16 @@ class ParamsTab(ScrolledPanel):
     def load_preset(self, preset):
         preset_data = preset.get(self.name, {})
 
+        # print(self.param_inputs, '\n\n', preset_data.items(), file=sys.stderr)
+
         for name, value in preset_data.items():
             if name in self.param_inputs:
-                try:
-                    self.param_inputs[name].SetValue(value)
-                except AttributeError:
+                if name in self.dict_of_choices and self.dict_of_choices[name]['param'].type == 'combo':
+                    self.param_inputs[name].SetSelection(self.get_combo_value_index(value, self.dict_of_choices[name]["param"].options))
+                elif isinstance(self.param_inputs[name], wx.Choice):
                     self.param_inputs[name].SetSelection(int(value))
+                else:
+                    self.param_inputs[name].SetValue(value)
                 self.changed_inputs.add(self.param_inputs[name])
 
         self.update_toggle_state()
@@ -299,16 +319,21 @@ class ParamsTab(ScrolledPanel):
     def update_choice_widgets(self, choice_tuple=None):
         if choice_tuple is None:  # update all choices
             for choice in self.dict_of_choices.values():
-                self.update_choice_widgets(
-                    (choice["param"].name, choice["widget"].GetSelection()))
+                if choice["param"].type == "combo":
+                    self.update_choice_widgets((choice["param"].name, choice["widget"].GetClientData(choice["widget"].GetSelection()).id))
+                else:
+                    self.update_choice_widgets((choice["param"].name, choice["widget"].GetSelection()))
         else:
             choice = self.dict_of_choices[choice_tuple[0]]
             last_selection = choice["last_initialized_choice"]
-            current_selection = choice["widget"].GetSelection()
+            if choice["param"].type == "combo":
+                current_selection = choice["widget"].GetClientData(choice["widget"].GetSelection()).id
+            else:
+                current_selection = choice["widget"].GetSelection()
+
             if last_selection != -1 and last_selection != current_selection:  # Hide the old widgets
                 for widget in self.choice_widgets[(choice["param"].name, last_selection)]:
                     widget.Hide()
-                    # self.settings_grid.Detach(widget)
 
             for widgets in grouper(self.choice_widgets[choice_tuple], 4):
                 widgets[0].Show(True)
@@ -375,6 +400,16 @@ class ParamsTab(ScrolledPanel):
                 input.Bind(wx.EVT_CHOICE, self.update_choice_state)
                 self.dict_of_choices[param.name] = {
                     "param": param, "widget": input, "last_initialized_choice": 1}
+            elif param.type == 'combo':
+                input = wx.ComboBox(self, wx.ID_ANY, choices=[], style=wx.CB_READONLY)
+                for option in param.options:
+                    input.Append(option.name, option)
+                value = self.get_combo_value_index(param.values[0], param.options)
+                input.SetSelection(value)
+                input.Bind(wx.EVT_COMBOBOX, self.changed)
+                input.Bind(wx.EVT_COMBOBOX, self.update_combo_state)
+                self.dict_of_choices[param.name] = {
+                    "param": param, "widget": input, "last_initialized_choice": 1}
             elif len(param.values) > 1:
                 input = wx.ComboBox(self, wx.ID_ANY, choices=sorted(
                     str(value) for value in param.values), style=wx.CB_DROPDOWN)
diff --git a/lib/stitches/contour_fill.py b/lib/stitches/contour_fill.py
index 885a7e6c..f5f2a3ee 100644
--- a/lib/stitches/contour_fill.py
+++ b/lib/stitches/contour_fill.py
@@ -12,9 +12,11 @@ from shapely.validation import make_valid
 
 from ..stitch_plan import Stitch
 from ..utils import DotDict
+from ..utils.clamp_path import clamp_path_to_polygon
 from ..utils.geometry import (cut, ensure_geometry_collection,
                               ensure_multi_polygon, reverse_line_string,
                               roll_linear_ring)
+from ..utils.smoothing import smooth_path
 from ..utils.threading import check_stop_flag
 from .running_stitch import running_stitch
 
@@ -406,11 +408,16 @@ def _find_path_inner_to_outer(tree, node, offset, starting_point, avoid_self_cro
     return LineString(result_coords)
 
 
-def inner_to_outer(tree, offset, stitch_length, tolerance, starting_point, avoid_self_crossing):
+def inner_to_outer(tree, polygon, offset, stitch_length, tolerance, smoothness, starting_point, avoid_self_crossing):
     """Fill a shape with spirals, from innermost to outermost."""
 
     stitch_path = _find_path_inner_to_outer(tree, 'root', offset, starting_point, avoid_self_crossing)
     points = [Stitch(*point) for point in stitch_path.coords]
+
+    if smoothness > 0:
+        smoothed = smooth_path(points, smoothness)
+        points = clamp_path_to_polygon(smoothed, polygon)
+
     stitches = running_stitch(points, stitch_length, tolerance)
 
     return stitches
diff --git a/lib/stitches/meander_fill.py b/lib/stitches/meander_fill.py
new file mode 100644
index 00000000..964a7a41
--- /dev/null
+++ b/lib/stitches/meander_fill.py
@@ -0,0 +1,177 @@
+from itertools import combinations
+
+import networkx as nx
+from shapely.geometry import MultiPoint, Point
+from shapely.ops import nearest_points
+
+from .running_stitch import running_stitch
+from .. import tiles
+from ..debug import debug
+from ..utils.clamp_path import clamp_path_to_polygon
+from ..utils.geometry import Point as InkStitchPoint, ensure_geometry_collection
+from ..utils.list import poprandom
+from ..utils.prng import iter_uniform_floats
+from ..utils.smoothing import smooth_path
+from ..utils.threading import check_stop_flag
+
+
+def meander_fill(fill, shape, shape_index, starting_point, ending_point):
+    debug.log(f"meander pattern: {fill.meander_pattern}")
+    tile = get_tile(fill.meander_pattern)
+    if not tile:
+        return []
+
+    debug.log(f"tile name: {tile.name}")
+
+    debug.log_line_strings(lambda: ensure_geometry_collection(shape.boundary).geoms, 'Meander shape')
+    graph = tile.to_graph(shape, fill.meander_scale)
+    debug.log_graph(graph, 'Meander graph')
+    ensure_connected(graph)
+    start, end = find_starting_and_ending_nodes(graph, shape, starting_point, ending_point)
+    rng = iter_uniform_floats(fill.random_seed, 'meander-fill', shape_index)
+
+    return post_process(generate_meander_path(graph, start, end, rng), shape, fill)
+
+
+def get_tile(tile_id):
+    all_tiles = {tile.id: tile for tile in tiles.all_tiles()}
+
+    try:
+        return all_tiles.get(tile_id, all_tiles.popitem()[1])
+    except KeyError:
+        return None
+
+
+def ensure_connected(graph):
+    """If graph is unconnected, add edges to make it connected."""
+
+    # TODO: combine this with possible_jumps() in lib/stitches/utils/autoroute.py
+    possible_connections = []
+    for component1, component2 in combinations(nx.connected_components(graph), 2):
+        points1 = MultiPoint([Point(node) for node in component1])
+        points2 = MultiPoint([Point(node) for node in component2])
+
+        start_point, end_point = nearest_points(points1, points2)
+        possible_connections.append(((start_point.x, start_point.y), (end_point.x, end_point.y), start_point.distance(end_point)))
+
+    if possible_connections:
+        for start, end in nx.k_edge_augmentation(graph, 1, avail=possible_connections):
+            check_stop_flag()
+            graph.add_edge(start, end)
+
+
+def find_starting_and_ending_nodes(graph, shape, starting_point, ending_point):
+    if starting_point is None:
+        starting_point = shape.exterior.coords[0]
+    starting_point = Point(starting_point)
+
+    if ending_point is None:
+        ending_point = starting_point
+    else:
+        ending_point = Point(ending_point)
+
+    all_points = MultiPoint(list(graph))
+
+    starting_node = nearest_points(starting_point, all_points)[1].coords[0]
+    ending_node = nearest_points(ending_point, all_points)[1].coords[0]
+
+    if starting_node == ending_node:
+        # We need a path to start with, so pick a new ending node
+        all_points = all_points.difference(Point(starting_node))
+        ending_node = nearest_points(ending_point, all_points)[1].coords[0]
+
+    return starting_node, ending_node
+
+
+def find_initial_path(graph, start, end):
+    # We need some path to start with.  We could use
+    # nx.all_simple_paths(graph, start, end) and choose the first one.
+    # However, that tends to pick a really "orderly" path.  Shortest
+    # path looks more random.
+
+    # TODO: handle if this can't find a path
+    return nx.shortest_path(graph, start, end)
+
+
+@debug.time
+def generate_meander_path(graph, start, end, rng):
+    path = find_initial_path(graph, start, end)
+    path_edges = list(zip(path[:-1], path[1:]))
+    graph.remove_edges_from(path_edges)
+    graph_nodes = set(graph) - set(path)
+
+    edges_to_consider = list(path_edges)
+    meander_path = path_edges
+    while edges_to_consider:
+        while edges_to_consider:
+            check_stop_flag()
+
+            edge = poprandom(edges_to_consider, rng)
+            edges_to_consider.extend(replace_edge(meander_path, edge, graph, graph_nodes))
+
+        edge_pairs = list(zip(meander_path[:-1], meander_path[1:]))
+        while edge_pairs:
+            check_stop_flag()
+
+            edge1, edge2 = poprandom(edge_pairs, rng)
+            edges_to_consider.extend(replace_edge_pair(meander_path, edge1, edge2, graph, graph_nodes))
+            break
+
+    return path_to_points(meander_path)
+
+
+def replace_edge(path, edge, graph, graph_nodes):
+    subgraph = graph.subgraph(graph_nodes | set(edge))
+    new_path = None
+    for new_path in nx.all_simple_edge_paths(subgraph, edge[0], edge[1], 7):
+        if len(new_path) > 1:
+            break
+    if new_path is None or len(new_path) == 1:
+        return []
+    i = path.index(edge)
+    path[i:i + 1] = new_path
+    graph.remove_edges_from(new_path)
+    # do I need to remove the last one too?
+    graph_nodes.difference_update(start for start, end in new_path)
+    # debug.log(f"found new path of length {len(new_path)} at position {i}")
+
+    return new_path
+
+
+def replace_edge_pair(path, edge1, edge2, graph, graph_nodes):
+    subgraph = graph.subgraph(graph_nodes | {edge1[0], edge2[1]})
+    new_path = None
+    for new_path in nx.all_simple_edge_paths(subgraph, edge1[0], edge2[1], 10):
+        if len(new_path) > 2:
+            break
+    if new_path is None or len(new_path) <= 2:
+        return []
+    i = path.index(edge1)
+    path[i:i + 2] = new_path
+    graph.remove_edges_from(new_path)
+    # do I need to remove the last one too?
+    graph_nodes.difference_update(start for start, end in new_path)
+    # debug.log(f"found new pair path of length {len(new_path)} at position {i}")
+
+    return new_path
+
+
+@debug.time
+def post_process(points, shape, fill):
+    debug.log(f"smoothness: {fill.smoothness}")
+    # debug.log_line_string(LineString(points), "pre-smoothed", "#FF0000")
+    smoothed_points = smooth_path(points, fill.smoothness)
+    smoothed_points = [InkStitchPoint.from_tuple(point) for point in smoothed_points]
+
+    stitches = running_stitch(smoothed_points, fill.running_stitch_length, fill.running_stitch_tolerance)
+    stitches = clamp_path_to_polygon(stitches, shape)
+
+    return stitches
+
+
+def path_to_points(path):
+    points = [start for start, end in path]
+    if path:
+        points.append(path[-1][1])
+
+    return points
diff --git a/lib/stitches/running_stitch.py b/lib/stitches/running_stitch.py
index 8ba53498..1dbfcaaf 100644
--- a/lib/stitches/running_stitch.py
+++ b/lib/stitches/running_stitch.py
@@ -24,7 +24,7 @@ def split_segment_even_n(a, b, segments: int, jitter_sigma: float = 0.0, random_
 
     splits = np.array(range(1, segments)) / segments
     if random_seed is not None:
-        jitters = (prng.nUniformFloats(len(splits), random_seed) * 2) - 1
+        jitters = (prng.n_uniform_floats(len(splits), random_seed) * 2) - 1
         splits = splits + jitters * (jitter_sigma / segments)
 
     # sort the splits in case a bad roll transposes any of them
@@ -39,12 +39,12 @@ def split_segment_even_dist(a, b, max_length: float, jitter_sigma: float = 0.0,
 
 def split_segment_random_phase(a, b, length: float, length_sigma: float, random_seed: str) -> typing.List[shgeo.Point]:
     line = shgeo.LineString([a, b])
-    progress = length * prng.uniformFloats(random_seed, "phase")[0]
+    progress = length * prng.uniform_floats(random_seed, "phase")[0]
     splits = [progress]
     distance = line.length
     if progress >= distance:
         return []
-    for x in prng.iterUniformFloats(random_seed):
+    for x in prng.iter_uniform_floats(random_seed):
         progress += length * (1 + length_sigma * (x - 0.5) * 2)
         if progress >= distance:
             break
diff --git a/lib/svg/tags.py b/lib/svg/tags.py
index 64f6c2f3..5a7d31c2 100644
--- a/lib/svg/tags.py
+++ b/lib/svg/tags.py
@@ -66,8 +66,11 @@ inkstitch_attribs = [
     'guided_fill_strategy',
     'join_style',
     'avoid_self_crossing',
+    'smoothness_mm',
     'clockwise',
     'reverse',
+    'meander_pattern',
+    'meander_scale_percent',
     'expand_mm',
     'fill_underlay',
     'fill_underlay_angle',
diff --git a/lib/tiles.py b/lib/tiles.py
new file mode 100644
index 00000000..683804a6
--- /dev/null
+++ b/lib/tiles.py
@@ -0,0 +1,188 @@
+import os
+from math import ceil, floor
+
+import inkex
+import json
+import lxml
+import networkx as nx
+from shapely.geometry import LineString
+from shapely.prepared import prep
+
+from .debug import debug
+from .i18n import _
+from .svg import apply_transforms
+from .utils import Point, cache, get_bundled_dir, guess_inkscape_config_path
+from .utils.threading import check_stop_flag
+
+
+class Tile:
+    def __init__(self, path):
+        self._load_tile(path)
+
+    def _load_tile(self, tile_path):
+        self.tile_svg = inkex.load_svg(os.path.join(tile_path, "tile.svg"))
+        self._load_metadata(tile_path)
+        self.tile = None
+        self.width = None
+        self.height = None
+        self.shift0 = None
+        self.shift1 = None
+
+    def __lt__(self, other):
+        return self.name < other.name
+
+    def __repr__(self):
+        return f"Tile({self.name}, {self.id})"
+
+    __str__ = __repr__
+
+    def _load_metadata(self, tile_path):
+        with open(os.path.join(tile_path, "tile.json"), "rb") as tile_json:
+            tile_metadata = json.load(tile_json)
+            self.name = _(tile_metadata.get('name'))
+            self.id = tile_metadata.get('id')
+
+    def _get_name(self, tile_path):
+        return os.path.splitext(os.path.basename(tile_path))[0]
+
+    def _load(self):
+        self._load_paths(self.tile_svg)
+        self._load_dimensions(self.tile_svg)
+        self._load_parallelogram(self.tile_svg)
+
+    def _load_paths(self, tile_svg):
+        path_elements = tile_svg.findall('.//svg:path', namespaces=inkex.NSS)
+        self.tile = self._path_elements_to_line_strings(path_elements)
+        # self.center, ignore, ignore = self._get_center_and_dimensions(self.tile)
+
+    def _load_dimensions(self, tile_svg):
+        svg_element = tile_svg.getroot()
+        self.width = svg_element.viewport_width
+        self.height = svg_element.viewport_height
+
+    def _load_parallelogram(self, tile_svg):
+        parallelogram_elements = tile_svg.findall(".//svg:*[@class='para']", namespaces=inkex.NSS)
+        if parallelogram_elements:
+            path_element = parallelogram_elements[0]
+            path = apply_transforms(path_element.get_path(), path_element)
+            subpaths = path.to_superpath()
+            subpath = subpaths[0]
+            points = [Point.from_tuple(p[1]) for p in subpath]
+            self.shift0 = points[1] - points[0]
+            self.shift1 = points[2] - points[1]
+        else:
+            self.shift0 = Point(self.width, 0)
+            self.shift1 = Point(0, self.height)
+
+    def _path_elements_to_line_strings(self, path_elements):
+        lines = []
+        for path_element in path_elements:
+            path = apply_transforms(path_element.get_path(), path_element)
+            for subpath in path.to_superpath():
+                # We only care about the endpoints of each subpath.  They're
+                # supposed to be simple line segments.
+                lines.append([Point.from_tuple(subpath[0][1]), Point.from_tuple(subpath[-1][1])])
+
+        return lines
+
+    def _get_center_and_dimensions(self, shape):
+        min_x, min_y, max_x, max_y = shape.bounds
+        center = Point((max_x + min_x) / 2, (max_y + min_y) / 2)
+        width = max_x - min_x
+        height = max_y - min_y
+
+        return center, width, height
+
+    def _translate_tile(self, shift):
+        translated_tile = []
+
+        for start, end in self.tile:
+            start += shift
+            end += shift
+            translated_tile.append((start.as_int().as_tuple(), end.as_int().as_tuple()))
+
+        return translated_tile
+
+    def _scale(self, x_scale, y_scale):
+        self.shift0 = self.shift0.scale(x_scale, y_scale)
+        self.shift1 = self.shift1.scale(x_scale, y_scale)
+
+        scaled_tile = []
+        for start, end in self.tile:
+            start = start.scale(x_scale, y_scale)
+            end = end.scale(x_scale, y_scale)
+            scaled_tile.append((start, end))
+        self.tile = scaled_tile
+
+    @debug.time
+    def to_graph(self, shape, scale):
+        """Apply this tile to a shape, repeating as necessary.
+
+        Return value:
+            networkx.Graph with edges corresponding to lines in the pattern.
+              Each edge has an attribute 'line_string' with the LineString
+              representation of this edge.
+        """
+        self._load()
+        x_scale, y_scale = scale
+        self._scale(x_scale, y_scale)
+
+        shape_center, shape_width, shape_height = self._get_center_and_dimensions(shape)
+        shape_diagonal = Point(shape_width, shape_height).length()
+        prepared_shape = prep(shape)
+
+        return self._generate_graph(prepared_shape, shape_center, shape_diagonal)
+
+    def _generate_graph(self, shape, shape_center, shape_diagonal):
+        graph = nx.Graph()
+        tiles0 = ceil(shape_diagonal / self.shift0.length()) + 2
+        tiles1 = ceil(shape_diagonal / self.shift1.length()) + 2
+        for repeat0 in range(floor(-tiles0 / 2), ceil(tiles0 / 2)):
+            for repeat1 in range(floor(-tiles1 / 2), ceil(tiles1 / 2)):
+                check_stop_flag()
+
+                shift0 = repeat0 * self.shift0
+                shift1 = repeat1 * self.shift1
+                this_tile = self._translate_tile(shift0 + shift1 + shape_center)
+                for line in this_tile:
+                    line_string = LineString(line)
+                    if shape.contains(line_string):
+                        graph.add_edge(line[0], line[1])
+
+        self._remove_dead_ends(graph)
+
+        return graph
+
+    def _remove_dead_ends(self, graph):
+        graph.remove_edges_from(nx.selfloop_edges(graph))
+        while True:
+            dead_end_nodes = [node for node, degree in graph.degree() if degree <= 1]
+
+            if dead_end_nodes:
+                graph.remove_nodes_from(dead_end_nodes)
+            else:
+                return
+
+
+def all_tile_paths():
+    return [os.path.join(guess_inkscape_config_path(), 'tiles'),
+            get_bundled_dir('tiles')]
+
+
+@cache
+def all_tiles():
+    tiles = []
+    for tiles_path in all_tile_paths():
+        try:
+            for tile_dir in sorted(os.listdir(tiles_path)):
+                try:
+                    tiles.append(Tile(os.path.join(tiles_path, tile_dir)))
+                except (OSError, lxml.etree.XMLSyntaxError, json.JSONDecodeError, KeyError) as exc:
+                    debug.log(f"error loading tile {tiles_path}/{tile_dir}: {exc}")
+                except Exception as exc:
+                    debug.log(f"unexpected error loading tile {tiles_path}/{tile_dir}: {exc}")
+                    raise
+        except FileNotFoundError:
+            pass
+
+    return tiles
diff --git a/lib/utils/clamp_path.py b/lib/utils/clamp_path.py
new file mode 100644
index 00000000..e5ef78d8
--- /dev/null
+++ b/lib/utils/clamp_path.py
@@ -0,0 +1,121 @@
+from shapely.geometry import LineString, Point as ShapelyPoint, MultiPolygon
+from shapely.prepared import prep
+from .geometry import Point, ensure_multi_line_string
+
+
+def path_to_segments(path):
+    """Convert a path of Points into a list of segments as LineStrings"""
+    for start, end in zip(path[:-1], path[1:]):
+        yield LineString((start, end))
+
+
+def segments_to_path(segments):
+    """Convert a list of contiguous LineStrings into a list of Points."""
+    coords = [segments[0].coords[0]]
+
+    for segment in segments:
+        coords.extend(segment.coords[1:])
+
+    return [Point(x, y) for x, y in coords]
+
+
+def fix_starting_point(border_pieces):
+    """Reconnect the starting point of a polygon border's pieces.
+
+    When splitting a polygon border with two lines, we want to get two
+    pieces.  However, that's not quite how Shapely works.  The outline
+    of the polygon is a LinearRing that starts and ends at the same place,
+    but Shapely still knows where that starting point is and splits there
+    too.
+
+    We don't want that third piece, so we'll reconnect the segments that
+    touch the starting point.
+    """
+
+    if len(border_pieces) == 3:
+        # Fortunately, Shapely keeps the starting point of the LinearRing
+        # as the starting point of the first segment.  That means it's also
+        # the ending point of the last segment.  Reconnecting is super simple:
+        return [border_pieces[1],
+                LineString(border_pieces[2].coords[:] + border_pieces[0].coords[1:])]
+    else:
+        # We probably cut exactly at the starting point.
+        return border_pieces
+
+
+def adjust_line_end(line, end):
+    """Reverse line if necessary to ensure that it ends near end."""
+
+    line_start = ShapelyPoint(*line.coords[0])
+    line_end = ShapelyPoint(*line.coords[-1])
+
+    if line_end.distance(end) < line_start.distance(end):
+        return line
+    else:
+        return LineString(line.coords[::-1])
+
+
+def find_border(polygon, point):
+    for border in polygon.interiors:
+        if border.intersects(point):
+            return border
+    else:
+        return polygon.exterior
+
+
+def clamp_path_to_polygon(path, polygon):
+    """Constrain a path to a Polygon.
+
+    Description: https://gis.stackexchange.com/questions/428848/clamp-linestring-to-polygon
+    """
+
+    path = LineString(path)
+
+    # This splits the path at the points where it intersects with the polygon
+    # border and returns the pieces in the same order as the original path.
+    split_path = ensure_multi_line_string(path.difference(polygon.boundary))
+
+    # contains() checks can fail without this.
+    buffered_polygon = prep(polygon.buffer(1e-9))
+
+    last_segment_inside = None
+    was_inside = False
+    result = []
+
+    for segment in split_path.geoms:
+        if buffered_polygon.contains(segment):
+            if not was_inside:
+                if last_segment_inside is not None:
+                    # The path crossed out of the polygon, and now it's crossed
+                    # back in.  We need to add a path along the border between
+                    # the exiting and entering points.
+
+                    # First, find the two points.  Buffer them just a bit to
+                    # ensure intersection with the border.
+                    x, y = last_segment_inside.coords[-1]
+                    exit_point = ShapelyPoint(x, y).buffer(0.01, resolution=1)
+                    x, y = segment.coords[0]
+                    entry_point = ShapelyPoint(x, y).buffer(0.01, resolution=1)
+
+                    if not exit_point.intersects(entry_point):
+                        # Now break the border into pieces using those points.
+                        border = find_border(polygon, exit_point)
+                        border_pieces = border.difference(MultiPolygon((entry_point, exit_point))).geoms
+                        border_pieces = fix_starting_point(border_pieces)
+
+                        # Pick the shortest way to get from the exiting to the
+                        # entering point along the border.
+                        shorter = min(border_pieces, key=lambda piece: piece.length)
+
+                        # We don't know which direction the polygon border
+                        # piece should be.  adjust_line_end() will figure
+                        # that out.
+                        result.append(adjust_line_end(shorter, entry_point))
+
+            result.append(segment)
+            was_inside = True
+            last_segment_inside = segment
+        else:
+            was_inside = False
+
+    return segments_to_path(result)
diff --git a/lib/utils/geometry.py b/lib/utils/geometry.py
index 789f8720..8f34c467 100644
--- a/lib/utils/geometry.py
+++ b/lib/utils/geometry.py
@@ -220,6 +220,9 @@ class Point:
     def rotate(self, angle):
         return self.__class__(self.x * math.cos(angle) - self.y * math.sin(angle), self.y * math.cos(angle) + self.x * math.sin(angle))
 
+    def scale(self, x_scale, y_scale):
+        return self.__class__(self.x * x_scale, self.y * y_scale)
+
     def as_int(self):
         return self.__class__(int(round(self.x)), int(round(self.y)))
 
@@ -238,3 +241,7 @@ class Point:
 
 def line_string_to_point_list(line_string):
     return [Point(*point) for point in line_string.coords]
+
+
+def coordinate_list_to_point_list(coordinate_list):
+    return [Point.from_tuple(coords) for coords in coordinate_list]
diff --git a/lib/utils/list.py b/lib/utils/list.py
new file mode 100644
index 00000000..efa3969e
--- /dev/null
+++ b/lib/utils/list.py
@@ -0,0 +1,23 @@
+import random
+
+
+def _uniform_rng():
+    while True:
+        yield random.uniform(0, 1)
+
+
+_rng = _uniform_rng()
+
+
+def poprandom(sequence, rng=_rng):
+    index = int(round(next(rng) * (len(sequence) - 1)))
+    item = sequence[index]
+
+    # It's O(1) to pop the last item, and O(n) to pop any other item. So we'll
+    # always pop the last item and put it in the slot vacated by the item we're
+    # popping.
+    last_item = sequence.pop()
+    if index < len(sequence):
+        sequence[index] = last_item
+
+    return item
diff --git a/lib/utils/prng.py b/lib/utils/prng.py
index 2ec037c6..33102205 100644
--- a/lib/utils/prng.py
+++ b/lib/utils/prng.py
@@ -3,7 +3,7 @@ from math import ceil
 from itertools import count, chain
 import numpy as np
 
-# Framework for reproducable pseudo-random number generation.
+# Framework for reproducible pseudo-random number generation.
 
 # Unlike python's random module (which uses a stateful generator based on global variables),
 # a counter-mode PRNG like uniformFloats can be used to generate multiple, independent random streams
@@ -13,7 +13,7 @@ import numpy as np
 # Using multiple counters for n-dimentional random streams is also possible and is useful for grid-like structures.
 
 
-def joinArgs(*args):
+def join_args(*args):
     # Stringifies parameters into a slash-separated string for use in hash keys.
     # Idempotent and associative.
     return "/".join([str(x) for x in args])
@@ -22,37 +22,37 @@ def joinArgs(*args):
 MAX_UNIFORM_INT = 2 ** 32 - 1
 
 
-def uniformInts(*args):
+def uniform_ints(*args):
     # Single pseudo-random drawing determined by the joined parameters.
     # To get a longer sequence of random numbers, call this loop with a counter as one of the parameters.
     # Returns 8 uniformly random uint32.
 
-    s = joinArgs(*args)
+    s = join_args(*args)
     # blake2s is python's fastest hash algorithm for small inputs and is designed to be usable as a PRNG.
     h = blake2s(s.encode()).hexdigest()
     nums = []
     for i in range(0, 64, 8):
-        nums.append(int(h[i:i+8], 16))
+        nums.append(int(h[i:i + 8], 16))
     return np.array(nums)
 
 
-def uniformFloats(*args):
+def uniform_floats(*args):
     # Single pseudo-random drawing determined by the joined parameters.
     # To get a longer sequence of random numbers, call this loop with a counter as one of the parameters.
     # Returns an array of 8 floats in the range [0,1]
-    return uniformInts(*args) / MAX_UNIFORM_INT
+    return uniform_ints(*args) / MAX_UNIFORM_INT
 
 
-def nUniformFloats(n: int, *args):
+def n_uniform_floats(n: int, *args):
     # returns a fixed number (which may exceed 8) of floats in the range [0,1]
-    seed = joinArgs(*args)
-    nBlocks = ceil(n/8)
-    blocks = [uniformFloats(seed, x) for x in range(nBlocks)]
+    seed = join_args(*args)
+    nBlocks = ceil(n / 8)
+    blocks = [uniform_floats(seed, x) for x in range(nBlocks)]
     return np.concatenate(blocks)[0:n]
 
 
-def iterUniformFloats(*args):
+def iter_uniform_floats(*args):
     # returns an infinite sequence of floats in the range [0,1]
-    seed = joinArgs(*args)
-    blocks = map(lambda x: list(uniformFloats(seed, x)), count(0))
+    seed = join_args(*args)
+    blocks = map(lambda x: list(uniform_floats(seed, x)), count(0))
     return chain.from_iterable(blocks)
diff --git a/lib/utils/smoothing.py b/lib/utils/smoothing.py
new file mode 100644
index 00000000..9d43a9f1
--- /dev/null
+++ b/lib/utils/smoothing.py
@@ -0,0 +1,84 @@
+import numpy as np
+from scipy.interpolate import splprep, splev
+
+from .geometry import Point, coordinate_list_to_point_list
+from ..stitches.running_stitch import running_stitch
+from ..debug import debug
+
+
+def _remove_duplicate_coordinates(coords_array):
+    """Remove consecutive duplicate points from an array.
+
+    Arguments:
+        coords_array -- numpy.array
+
+    Returns:
+        a numpy.array of coordinates, minus consecutive duplicates
+    """
+
+    differences = np.diff(coords_array, axis=0)
+    zero_differences = np.isclose(differences, 0)
+    keepers = np.r_[True, np.any(zero_differences == False, axis=1)]  # noqa: E712
+
+    return coords_array[keepers]
+
+
+@debug.time
+def smooth_path(path, smoothness=1.0):
+    """Smooth a path of coordinates.
+
+    Arguments:
+        path -- an iterable of coordinate tuples or Points
+        smoothness -- float, how much smoothing to apply.  Bigger numbers
+            smooth more.
+
+    Returns:
+        A list of Points.
+    """
+    from ..debug import debug
+
+    if smoothness == 0:
+        # s of exactly zero seems to indicate a default level of smoothing
+        # in splprep, so we'll just exit instead.
+        return path
+
+    # Smoothing seems to look nicer if the line segments in the path are mostly
+    # similar in length.  If we have some especially long segments, then the
+    # smoothed path sometimes diverges more from the original path as the
+    # spline curve struggles to fit the path.  This can be especially bad at
+    # the start and end.
+    #
+    # Fortunately, we can convert the path to segments that are mostly the same
+    # length by using the running stitch algorithm.
+    path = running_stitch(coordinate_list_to_point_list(path), 5 * smoothness, smoothness / 2)
+
+    # splprep blows up on duplicated consecutive points with "Invalid inputs"
+    coords = _remove_duplicate_coordinates(np.array(path))
+    num_points = len(coords)
+
+    if num_points <= 3:
+        # splprep throws an error unless num_points > k
+        return path
+
+    # s is explained in this issue: https://github.com/scipy/scipy/issues/11916
+    # the smoothness parameter limits how much the smoothed path can deviate
+    # from the original path.  The standard deviation of the distance between
+    # the smoothed path and the original path is equal to the smoothness.
+    # In practical terms, if smoothness is 1mm, then the smoothed path can be
+    # up to 1mm away from the original path.
+    s = num_points * (smoothness ** 2)
+
+    # .T transposes the array (for some reason splprep expects
+    # [[x1, x2, ...], [y1, y2, ...]]
+    tck, fp, ier, msg = splprep(coords.T, s=s, k=3, nest=-1, full_output=1)
+    if ier > 0:
+        debug.log(f"error {ier} smoothing path: {msg}")
+        return path
+
+    # Evaluate the spline curve at many points along its length to produce the
+    # smoothed point list.  2 * num_points seems to be a good number, but it
+    # does produce a lot of points.
+    smoothed_x_values, smoothed_y_values = splev(np.linspace(0, 1, int(num_points * 2)), tck[0])
+    coords = np.array([smoothed_x_values, smoothed_y_values]).T
+
+    return [Point(x, y) for x, y in coords]
diff --git a/lib/utils/string.py b/lib/utils/string.py
index cb852ce3..e9204076 100644
--- a/lib/utils/string.py
+++ b/lib/utils/string.py
@@ -8,3 +8,10 @@ def string_to_floats(string, delimiter=","):
 
     floats = string.split(delimiter)
     return [float(num) for num in floats]
+
+
+def remove_suffix(string, suffix):
+    if string.endswith(suffix):
+        return string[:-len(suffix)]
+    else:
+        return string
diff --git a/tiles/N3-11a/tile.json b/tiles/N3-11a/tile.json
new file mode 100644
index 00000000..d894e7c4
--- /dev/null
+++ b/tiles/N3-11a/tile.json
@@ -0,0 +1,5 @@
+{
+  "id": "N3-11a",
+  "name": "N3-11a",
+  "description": ""
+}
diff --git a/tiles/N3-11a/tile.svg b/tiles/N3-11a/tile.svg
new file mode 100644
index 00000000..165fb8ce
--- /dev/null
+++ b/tiles/N3-11a/tile.svg
@@ -0,0 +1,119 @@
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diff --git a/tiles/N3-12/tile.json b/tiles/N3-12/tile.json
new file mode 100644
index 00000000..69372fad
--- /dev/null
+++ b/tiles/N3-12/tile.json
@@ -0,0 +1,5 @@
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+  "id": "N3-12",
+  "name": "N3-12",
+  "description": ""
+}
diff --git a/tiles/N3-12/tile.svg b/tiles/N3-12/tile.svg
new file mode 100644
index 00000000..fb2bab94
--- /dev/null
+++ b/tiles/N3-12/tile.svg
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diff --git a/tiles/N3-16a/tile.json b/tiles/N3-16a/tile.json
new file mode 100644
index 00000000..400caedc
--- /dev/null
+++ b/tiles/N3-16a/tile.json
@@ -0,0 +1,5 @@
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+  "name": "N3-16a",
+  "description": ""
+}
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new file mode 100644
index 00000000..64d7a2c8
--- /dev/null
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diff --git a/tiles/N3-17/tile.json b/tiles/N3-17/tile.json
new file mode 100644
index 00000000..c5ee9c4f
--- /dev/null
+++ b/tiles/N3-17/tile.json
@@ -0,0 +1,5 @@
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+  "description": ""
+}
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new file mode 100644
index 00000000..71b571c2
--- /dev/null
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diff --git a/tiles/N3-18-modified/tile.json b/tiles/N3-18-modified/tile.json
new file mode 100644
index 00000000..1e661e9f
--- /dev/null
+++ b/tiles/N3-18-modified/tile.json
@@ -0,0 +1,5 @@
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new file mode 100644
index 00000000..6fd21056
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/tiles/P4-1/tile.json b/tiles/P4-1/tile.json
new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/tiles/P4-43-modified/tile.json b/tiles/P4-43-modified/tile.json
new file mode 100644
index 00000000..27c7ce54
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+++ b/tiles/P4-43-modified/tile.json
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diff --git a/tiles/P4-43-modified/tile.svg b/tiles/P4-43-modified/tile.svg
new file mode 100644
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diff --git a/tiles/P4-43/tile.json b/tiles/P4-43/tile.json
new file mode 100644
index 00000000..3af1b93d
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+++ b/tiles/P4-43/tile.json
@@ -0,0 +1,5 @@
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diff --git a/tiles/P4-43/tile.svg b/tiles/P4-43/tile.svg
new file mode 100644
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diff --git a/tiles/P4-47/tile.json b/tiles/P4-47/tile.json
new file mode 100644
index 00000000..27acc39e
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+++ b/tiles/P4-47/tile.json
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diff --git a/tiles/P4-47/tile.svg b/tiles/P4-47/tile.svg
new file mode 100644
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diff --git a/tiles/P5-10_11/tile.json b/tiles/P5-10_11/tile.json
new file mode 100644
index 00000000..f52691af
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diff --git a/tiles/P5-10_11/tile.svg b/tiles/P5-10_11/tile.svg
new file mode 100644
index 00000000..8b578c95
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new file mode 100644
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diff --git a/tiles/hexagon/tile.json b/tiles/hexagon/tile.json
new file mode 100644
index 00000000..30728c29
--- /dev/null
+++ b/tiles/hexagon/tile.json
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+}
diff --git a/tiles/hexagon/tile.svg b/tiles/hexagon/tile.svg
new file mode 100644
index 00000000..e5093ae7
--- /dev/null
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new file mode 100644
index 00000000..2445a7ec
--- /dev/null
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new file mode 100644
index 00000000..768d3ebe
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