Draft: Support relative paths for hatch patterns

src/Mod/Draft/draftobjects/hatch.py

@@ -30,6 +30,7 @@ import FreeCAD as App
 from draftgeoutils.general import geomType
 from draftobjects.base import DraftObject
 from draftutils import gui_utils
+from draftutils.messages import _err
 from draftutils.translate import translate
 
 
@@ -85,12 +86,37 @@ class Hatch(DraftObject):
                 or not obj.File \
                 or not obj.Pattern \
                 or not obj.Scale \
-                or not obj.Pattern in self.getPatterns(obj.File) \
                 or not obj.Base.isDerivedFrom("Part::Feature") \
                 or not obj.Base.Shape.Faces:
             self.props_changed_clear()
             return
 
+        if obj.File[0] == ".":
+            # File path relative to the FreeCAD file directory.
+            pat_file = os.path.join(os.path.dirname(obj.Document.FileName), obj.File)
+            # We need the absolute path to do some file checks.
+            pat_file = os.path.abspath(pat_file)
+        else:
+            pat_file = obj.File
+
+        # File checks:
+        if not os.path.exists(pat_file):
+            _err(obj.Label + ": " + translate("draft", "PAT file not found"))
+            self.props_changed_clear()
+            return
+        if not os.path.isfile(pat_file):
+            _err(obj.Label + ": " + translate("draft", "Specified PAT file is not a file"))
+            self.props_changed_clear()
+            return
+        if os.path.splitext(pat_file)[1].lower() != ".pat":
+            _err(obj.Label + ": " + translate("draft", "Specified file type is not supported"))
+            self.props_changed_clear()
+            return
+        if not obj.Pattern in self.getPatterns(pat_file):
+            _err(obj.Label + ": " + translate("draft", "Pattern not found in PAT file"))
+            self.props_changed_clear()
+            return
+
         import Part
         import TechDraw
 
@@ -134,7 +160,7 @@ class Hatch(DraftObject):
                 if obj.Rotation.Value:
                     face.rotate(App.Vector(), App.Vector(0, 0, 1), -obj.Rotation)
 
-                shape = TechDraw.makeGeomHatch(face, obj.Scale, obj.Pattern, obj.File)
+                shape = TechDraw.makeGeomHatch(face, obj.Scale, obj.Pattern, pat_file)
 
                 if obj.Rotation.Value:
                     shape.rotate(App.Vector(), App.Vector(0, 0, 1), obj.Rotation)