Fix issue with bad color names (#3816)

* fix issue with bad color names and define element colors at one place and reuse
* fix bad tartan color
* verify color in gradient block
* add thread color tests
* use default color behavior for elements linked to non-existing definitions (gradients)
* Added mypy change for tests (authored by: CapellanCitizen)

3 files changed, 15 insertions, 7 deletions

diff --git a/lib/extensions/break_apart.py b/lib/extensions/break_apart.py
index 21806251..05f9375a 100644
--- a/lib/extensions/break_apart.py
+++ b/lib/extensions/break_apart.py
@@ -39,7 +39,7 @@ class BreakApart(InkstitchExtension):
                 elements.append(EmbroideryElement(node))
 
         for element in elements:
-            if not element.get_style("fill", "black"):
+            if not element.fill_color:
                 continue
 
             # we don't want to touch valid elements
diff --git a/lib/extensions/gradient_blocks.py b/lib/extensions/gradient_blocks.py
index 79665a10..364ff2b2 100644
--- a/lib/extensions/gradient_blocks.py
+++ b/lib/extensions/gradient_blocks.py
@@ -5,8 +5,8 @@
 
 from math import degrees, pi
 
-from inkex import (DirectedLineSegment, Group, LinearGradient, Path,
-                   PathElement, Transform, errormsg)
+from inkex import (Color, ColorError, DirectedLineSegment, Group,
+                   LinearGradient, Path, PathElement, Transform, errormsg)
 from shapely import geometry as shgeo
 from shapely.affinity import rotate
 from shapely.ops import split
@@ -67,7 +67,7 @@ class GradientBlocks(InkstitchExtension):
             for i, shape in enumerate(fill_shapes):
                 if shape.area < 15:
                     continue
-                color = attributes[i]['color']
+                color = verify_color(attributes[i]['color'])
                 style['fill'] = color
                 is_gradient = attributes[i]['is_gradient']
                 angle = degrees(attributes[i]['angle'])
@@ -146,7 +146,7 @@ def gradient_shapes_and_attributes(element, shape, unit_multiplier):
         split_line = rotate(split_line, angle, origin=split_point, use_radians=True)
         offset_line = split_line.parallel_offset(1, 'right')
         polygon = split(shape, split_line)
-        color = stop_styles[i]['stop-color']
+        color = verify_color(stop_styles[i]['stop-color'])
         # does this gradient line split the shape
         offset_outside_shape = len(polygon.geoms) == 1
         for poly in polygon.geoms:
@@ -178,6 +178,14 @@ def gradient_shapes_and_attributes(element, shape, unit_multiplier):
     return polygons, attributes
 
 
+def verify_color(color):
+    try:
+        Color(color)
+    except ColorError:
+        return "black"
+    return color
+
+
 if __name__ == '__main__':
     e = GradientBlocks()
     e.run()
diff --git a/lib/extensions/params.py b/lib/extensions/params.py
index cb38585e..0bba13fe 100755
--- a/lib/extensions/params.py
+++ b/lib/extensions/params.py
@@ -721,9 +721,9 @@ class Params(InkstitchExtension):
             elif node.tag in EMBROIDERABLE_TAGS and not node.get_path():
                 pass
             else:
-                if element.get_style("fill", 'black') and not element.get_style("fill-opacity", 1) == "0":
+                if element.fill_color is not None and not element.get_style("fill-opacity", 1) == "0":
                     classes.append(FillStitch)
-                if element.get_style("stroke") is not None:
+                if element.stroke_color is not None:
                     classes.append(Stroke)
                     if len(element.path) > 1:
                         classes.append(SatinColumn)