fix: Trough Hole & "unspecified" position to center of pads (#181)

* Fixed Trough Hole position to center of pads, and "unspecifiled" to centor of bounding box.

* "unspecified" changed to center of pads.  "Origin" field added.

README.md

@@ -133,7 +133,15 @@ _The fields will be queried in the order denoted above._
 
 _The fields will be queried in the order denoted above._
 
-### ⑤ Override Component Layer
+### ⑤ Override Component Origin
+The Fabrication Toolkit reports the position of each component based on an automatically selected point of reference. This default behavior can be overridden by adding an **Origin** field to the component. 
+
+The **Origin** field supports the following values:
+
+- `Anchor` - Uses the footprint's anchor point, which can be modified in KiCad's footprint editor.
+- `Center` - Uses the center of the bounding box formed by the footprint's pads.
+
+### ⑥ Override Component Layer
 Some footprints may have their components defined on the opposite layer to there actual footprints. In these instances you can override mount side by using this field.
 
 Values can be `top`, `bottom`, `t` or `b`.

plugins/process.py

@@ -113,25 +113,34 @@ class ProcessManager:
         netlist_writer = pcbnew.IPC356D_WRITER(self.board)
         netlist_writer.Write(os.path.join(temp_dir, netlistFileName))
 
-    def _get_footprint_position(self, footprint):
-        """Calculate position based on center of bounding box."""
-        position = footprint.GetPosition()
+    def _get_footprint_position(self, footprint):       
         attributes = footprint.GetAttributes()
-
+        #determin origin type by packge type
         if attributes & pcbnew.FP_SMD:
+            origin_type='Anchor'
+        else: 
+            origin_type='Center'
+       
+        #allow user override
+        key='Origin'
+        if footprint_has_field(footprint, key):
+            origin_type_override = str(footprint_get_field(footprint, key)).capitalize()
+            if origin_type_override in ['Anchor','Center']:
+                origin_type=origin_type_override
+
+        if origin_type=='Anchor':
             position = footprint.GetPosition()
-        elif attributes & pcbnew.FP_THROUGH_HOLE:
-            position = footprint.GetBoundingBox(False, False).GetCenter()
-        else:                                           # handle Unspecified footprint type
+        else: #if type_origin=='center' or anything ele
             pads = footprint.Pads()
             if len(pads) > 0:
                 # get bounding box based on pads only to ignore non-copper layers, e.g. silkscreen
                 bbox = pads[0].GetBoundingBox()         # start with small bounding box
                 for pad in pads:
                     bbox.Merge(pad.GetBoundingBox())    # expand bounding box
-
                 position = bbox.GetCenter()
-
+            else:
+                position = footprint.GetPosition() #if we have no pads we fallback to anchor
+    
         return position
 
     def generate_tables(self, temp_dir, auto_translate, exclude_dnp):