Draft: improved handling of 'crazy' edges in hatch

See #14114.

src/Mod/Draft/draftobjects/hatch.py

@@ -96,6 +96,15 @@ class Hatch(DraftObject):
         import Part
         import TechDraw
 
+        # In TechDraw edges longer than 9999.9 (ca. 10m) are considered 'crazy'.
+        # Lines in hatch patterns are also checked. We need to change a parameter:
+        param_grp = App.ParamGet("User parameter:BaseApp/Preferences/Mod/TechDraw/debug")
+        if "allowCrazyEdge" not in param_grp.GetBools():
+            old_allow_crazy_edge = None
+        else:
+            old_allow_crazy_edge = param_grp.GetBool("allowCrazyEdge")
+        param_grp.SetBool("allowCrazyEdge", True)
+
         shapes = []
         for face in obj.Base.Shape.Faces:
             if face.findPlane(): # Only planar faces.
@@ -124,26 +133,22 @@ class Hatch(DraftObject):
                         rot = App.Rotation(App.Vector(0, 0, 1), w)
                         mtx = App.Placement(cen, rot).Matrix
                     face = face.transformShape(mtx.inverse()).Faces[0]
-
-                # In TechDraw edges longer than 9999.9 (ca. 10m) are considered 'crazy'.
-                # Lines in a hatch pattern are also checked. In the code below 9999 is
-                # used. With extra scaling based on that value a 1000m x 1000m rectangle
-                # can be hatched. Tested with pattern: Diagonal4, and pattern scale: 1000.
-                # With a limit of 9999.9 the same test fails.
-                if face.BoundBox.DiagonalLength > 9999:
-                    extra_scale = 9999 / face.BoundBox.DiagonalLength
-                else:
-                    extra_scale = 1.0
-                face.scale(extra_scale)
                 if obj.Rotation.Value:
                     face.rotate(App.Vector(), App.Vector(0, 0, 1), -obj.Rotation)
-                shape = TechDraw.makeGeomHatch(face, obj.Scale * extra_scale, obj.Pattern, obj.File)
-                shape.scale(1 / extra_scale)
+
+                shape = TechDraw.makeGeomHatch(face, obj.Scale, obj.Pattern, obj.File)
+
                 if obj.Rotation.Value:
                     shape.rotate(App.Vector(), App.Vector(0, 0, 1), obj.Rotation)
                 if obj.Translate:
                     shape = shape.transformShape(mtx)
                 shapes.append(shape)
+
+        if old_allow_crazy_edge is None:
+            param_grp.RemBool("allowCrazyEdge")
+        else:
+            param_grp.SetBool("allowCrazyEdge", old_allow_crazy_edge)
+
         if shapes:
             obj.Shape = Part.makeCompound(shapes)
         self.props_changed_clear()