Fix bug where editing styles didn't work if factors were stored instead of RGB colours

src/ifcopenshell-python/ifcopenshell/api/style/edit_surface_style.py

@@ -0,0 +1,45 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"style": None, "attributes": {}}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for key, value in self.settings["attributes"].items():
+            if key == "SurfaceColour":
+                self.edit_surface_colour(value)
+            elif self.is_colour_or_factor(key):
+                self.edit_colour_or_factor(key, value)
+            else:
+                setattr(self.settings["style"], key, value)
+
+    def edit_surface_colour(self, value):
+        self.settings["style"].SurfaceColour[1] = value[0]
+        self.settings["style"].SurfaceColour[2] = value[1]
+        self.settings["style"].SurfaceColour[3] = value[2]
+
+    def is_colour_or_factor(self, name):
+        return name in [
+            "DiffuseColour",
+            "TransmissionColour",
+            "DiffuseTransmissionColour",
+            "ReflectionColour",
+            "SpecularColour",
+        ]
+
+    def edit_colour_or_factor(self, name, value):
+        if isinstance(value, (list, tuple)):
+            attribute = getattr(self.settings["style"], name)
+            if not attribute or not attribute.is_a("IfcColourRgb"):
+                colour = self.file.createIfcColourRgb(None, 0, 0, 0)
+                setattr(self.settings["style"], name, colour)
+                attribute = getattr(self.settings["style"], name)
+            attribute[1] = value[0]
+            attribute[2] = value[1]
+            attribute[3] = value[2]
+        else:
+            existing_value = getattr(self.settings["style"], name)
+            if existing_value and existing_value.id():
+                self.file.remove(existing_value)
+            setattr(self.settings["style"], name, self.file.createIfcNormalisedRatioMeasure(value))