From b1f54da0f4182c4a6be5b13aa735c2d91cf96ee8 Mon Sep 17 00:00:00 2001
From: varkenvarken <andersmichel8@gmail.com>
Date: Fri, 19 Jan 2024 10:21:19 +0100
Subject: [PATCH] updated linefit.py for Blender 4.x

---
 linefit.py | 111 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 63 insertions(+), 48 deletions(-)

diff --git a/linefit.py b/linefit.py
index d570906..274c1cb 100644
--- a/linefit.py
+++ b/linefit.py
@@ -1,6 +1,6 @@
 # ##### BEGIN GPL LICENSE BLOCK #####
 #
-#  LineFit, (c) 2017 Michel Anders (varkenvarken)
+#  LineFit, (c) 2017, 2024 Michel Anders (varkenvarken)
 #
 #  This program is free software; you can redistribute it and/or
 #  modify it under the terms of the GNU General Public License
@@ -21,8 +21,8 @@
 bl_info = {
     "name": "LineFit",
     "author": "Michel Anders (varkenvarken)",
-    "version": (0, 0, 201712201343),
-    "blender": (2, 79, 0),
+    "version": (0, 0, 20240119100755),
+    "blender": (4, 0, 0),
     "location": "Edit mode 3d-view, Add-->LineFit",
     "description": "Add a single edge to the mesh that best fits a collection of selected vertices",
     "warning": "",
@@ -32,64 +32,79 @@
 
 import numpy as np
 
+
 def lineFit(points):
     ctr = points.mean(axis=0)
     x = points - ctr
     M = np.cov(x.T)
-    eigenvalues,eigenvectors = np.linalg.eig(M)
-    direction = eigenvectors[:,eigenvalues.argmax()]
-    return ctr,direction
+    eigenvalues, eigenvectors = np.linalg.eig(M)
+    direction = eigenvectors[:, eigenvalues.argmax()]
+    return ctr, direction
+
 
 import bpy
 
+
 class LineFit(bpy.types.Operator):
-	bl_idname = 'mesh.linefit'
-	bl_label = 'LineFit'
-	bl_options = {'REGISTER', 'UNDO'}
-
-	size = bpy.props.FloatProperty(name="Length", description="Length of the line segment", default=1, min=0, soft_max=10)
-
-	@classmethod
-	def poll(self, context):
-		return (context.mode == 'EDIT_MESH' and context.active_object.type == 'MESH')
-
-	def execute(self, context):
-		bpy.ops.object.editmode_toggle()
-		me = context.active_object.data
-		count = len(me.vertices)
-		if count > 0:  # degenerate mesh, but better safe than sorry
-			shape = (count, 3)
-			verts = np.empty(count*3, dtype=np.float32)
-			selected = np.empty(count, dtype=np.bool)
-			me.vertices.foreach_get('co', verts)
-			me.vertices.foreach_get('select', selected)
-			verts.shape = shape
-			if np.count_nonzero(selected) >= 2 :
-				ctr, direction = lineFit(verts[selected])
-				# can't use mesh.from_pydata here because that won't let us ADD to a mesh
-				me.vertices.add(2)
-				me.vertices[count  ].co = ctr-direction*self.size
-				me.vertices[count+1].co = ctr+direction*self.size
-				ecount = len(me.edges)
-				me.edges.add(1)
-				me.edges[ecount].vertices = [count,count+1]
-				me.update(calc_edges=False)
-			else:
-				self.report({'WARNING'}, "Need at least 2 selected vertices to fit a line through")
-		bpy.ops.object.editmode_toggle()
-		return {'FINISHED'}
+    bl_idname = "mesh.linefit"
+    bl_label = "LineFit"
+    bl_options = {"REGISTER", "UNDO"}
+
+    size : bpy.props.FloatProperty(
+        name="Length",
+        description="Length of the line segment",
+        default=1,
+        min=0,
+        soft_max=10,
+    )
+
+    @classmethod
+    def poll(self, context):
+        return context.mode == "EDIT_MESH" and context.active_object.type == "MESH"
+
+    def execute(self, context):
+        bpy.ops.object.editmode_toggle()
+        me = context.active_object.data
+        count = len(me.vertices)
+        if count > 0:  # degenerate mesh, but better safe than sorry
+            shape = (count, 3)
+            verts = np.empty(count * 3, dtype=np.float32)
+            selected = np.empty(count, dtype=np.bool)
+            me.vertices.foreach_get("co", verts)
+            me.vertices.foreach_get("select", selected)
+            verts.shape = shape
+            if np.count_nonzero(selected) >= 2:
+                ctr, direction = lineFit(verts[selected])
+                # can't use mesh.from_pydata here because that won't let us ADD to a mesh
+                me.vertices.add(2)
+                me.vertices[count].co = ctr - direction * self.size
+                me.vertices[count + 1].co = ctr + direction * self.size
+                ecount = len(me.edges)
+                me.edges.add(1)
+                me.edges[ecount].vertices = [count, count + 1]
+                me.update(calc_edges=False)
+            else:
+                self.report(
+                    {"WARNING"},
+                    "Need at least 2 selected vertices to fit a line through",
+                )
+        bpy.ops.object.editmode_toggle()
+        return {"FINISHED"}
+
 
 def menu_func(self, context):
-	self.layout.operator(LineFit.bl_idname, text="Fit line to selected",
-						icon='PLUGIN')
+    self.layout.operator(LineFit.bl_idname, text="Fit line to selected", icon="PLUGIN")
+
 
 def register():
-	bpy.utils.register_module(__name__)
-	bpy.types.INFO_MT_mesh_add.append(menu_func)
+    bpy.utils.register_class(LineFit)
+    bpy.types.VIEW3D_MT_mesh_add.append(menu_func)
+
 
 def unregister():
-	bpy.types.INFO_MT_mesh_add.remove(menu_func)
-	bpy.utils.unregister_module(__name__)
+    bpy.types.VIEW3D_MT_mesh_add.remove(menu_func)
+    bpy.utils.unregister_class(LineFit)
+
 
 if __name__ == "__main__":
-	register()
+    register()