1 files changed, 73 insertions, 0 deletions
diff --git a/lib/elements/polyline.py b/lib/elements/polyline.py
new file mode 100644
index 00000000..5c474237
--- /dev/null
+++ b/lib/elements/polyline.py
@@ -0,0 +1,73 @@
+from .element import param, EmbroideryElement, Patch
+from ..i18n import _
+from ..utils.geometry import Point
+from ..utils import cache
+
+
+class Polyline(EmbroideryElement):
+    # Handle a <polyline> element, which is treated as a set of points to
+    # stitch exactly.
+    #
+    # <polyline> elements are pretty rare in SVG, from what I can tell.
+    # Anything you can do with a <polyline> can also be done with a <p>, and
+    # much more.
+    #
+    # Notably, EmbroiderModder2 uses <polyline> elements when converting from
+    # common machine embroidery file formats to SVG.  Handling those here lets
+    # users use File -> Import to pull in existing designs they may have
+    # obtained, for example purchased fonts.
+
+    @property
+    def points(self):
+       # example: "1,2 0,0 1.5,3 4,2"
+
+       points = self.node.get('points')
+       points = points.split(" ")
+       points = [[float(coord) for coord in point.split(",")] for point in points]
+
+       return points
+
+    @property
+    def path(self):
+        # A polyline is a series of connected line segments described by their
+        # points.  In order to make use of the existing logic for incorporating
+        # svg transforms that is in our superclass, we'll convert the polyline
+        # to a degenerate cubic superpath in which the bezier handles are on
+        # the segment endpoints.
+
+        path = [[[point[:], point[:], point[:]] for point in self.points]]
+
+        return path
+
+    @property
+    @cache
+    def csp(self):
+        csp = self.parse_path()
+
+        return csp
+
+    @property
+    def color(self):
+        # EmbroiderModder2 likes to use the `stroke` property directly instead
+        # of CSS.
+        return self.get_style("stroke") or self.node.get("stroke")
+
+    @property
+    def stitches(self):
+        # For a <polyline>, we'll stitch the points exactly as they exist in
+        # the SVG, with no stitch spacing interpolation, flattening, etc.
+
+        # See the comments in the parent class's parse_path method for a
+        # description of the CSP data structure.
+
+        stitches = [point for handle_before, point, handle_after in self.csp[0]]
+
+        return stitches
+
+    def to_patches(self, last_patch):
+        patch = Patch(color=self.color)
+
+        for stitch in self.stitches:
+            patch.add_stitch(Point(*stitch))
+
+        return [patch]