helper classes added

src/specklepy/objects/geometry/arc.py

@@ -8,8 +8,7 @@ from specklepy.objects.interfaces import ICurve, IHasUnits
 
 
 @dataclass(kw_only=True)
-class Arc(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Arc"):
-
+class Arc(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Arc", serialize_ignore={"radius", "length"}):
     plane: Plane
     startPoint: Point
     midPoint: Point
@@ -17,15 +16,27 @@ class Arc(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Arc"):
 
     @property
     def radius(self) -> float:
-        return self.startPoint.distance_to(self.plane.origin)
+        return self.__dict__.get('_radius')
 
-    @property
-    def measure(self) -> float:
-        start_to_mid = self.startPoint.distance_to(self.midPoint)
-        mid_to_end = self.midPoint.distance_to(self.endPoint)
-        r = self.radius
-        return (2 * math.asin(start_to_mid / (2 * r))) + (2 * math.asin(mid_to_end / (2 * r)))
+    @radius.setter
+    def radius(self, value: float) -> None:
+        self.__dict__['_radius'] = value
 
     @property
     def length(self) -> float:
-        return self.radius * self.measure
+        return self.__dict__.get('_length')
+
+    @length.setter
+    def length(self, value: float) -> None:
+        self.__dict__['_length'] = value
+
+    def calculate_radius(self) -> float:
+        return self.startPoint.distance_to(self.plane.origin)
+
+    def calculate_length(self) -> float:
+        start_to_mid = self.startPoint.distance_to(self.midPoint)
+        mid_to_end = self.midPoint.distance_to(self.endPoint)
+        r = self.calculate_radius()
+        angle = (2 * math.asin(start_to_mid / (2 * r))) + \
+            (2 * math.asin(mid_to_end / (2 * r)))
+        return r * angle

src/specklepy/objects/geometry/line.py

@@ -6,17 +6,23 @@ from specklepy.objects.interfaces import ICurve, IHasUnits
 
 
 @dataclass(kw_only=True)
-class Line(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Line"):
-    """
-    a line defined by two points in 3D space
-    """
-
+class Line(
+    Base,
+    IHasUnits,
+    ICurve,
+    speckle_type="Objects.Geometry.Line",
+    serialize_ignore={"length"}
+):
     start: Point
     end: Point
 
     @property
     def length(self) -> float:
-        """
-        calculate the length of the line using Point's distance_to method
-        """
+        return self.__dict__.get('_length')
+
+    @length.setter
+    def length(self, value: float) -> None:
+        self.__dict__['_length'] = value
+
+    def calculate_length(self) -> float:
         return self.start.distance_to(self.end)

src/specklepy/objects/geometry/mesh.py

@@ -20,6 +20,8 @@ class Mesh(
         "colors": 62500,
         "textureCoordinates": 31250,
     },
+    serialize_ignore={"area", "volume",
+                      "vertices_count", "texture_coordinates_count"},
 ):
     """
     a 3D mesh consisting of vertices and faces with optional colors and texture coordinates
@@ -44,8 +46,7 @@ class Mesh(
         """
         get the number of vertices in the mesh
         """
-        if not self.vertices:
-            return 0
+
         if len(self.vertices) % 3 != 0:
             raise ValueError(
                 f"Invalid vertices list: length ({len(
@@ -53,19 +54,6 @@ class Mesh(
             )
         return len(self.vertices) // 3
 
-    @property
-    def faces_count(self) -> int:
-        """
-        get the number of faces in the mesh
-        """
-        count = 0
-        i = 0
-        while i < len(self.faces):
-            n = self.faces[i]
-            count += 1
-            i += n + 1
-        return count
-
     @property
     def texture_coordinates_count(self) -> int:
         """
@@ -75,6 +63,21 @@ class Mesh(
 
     @property
     def area(self) -> float:
+        return self.__dict__.get('_area')
+
+    @area.setter
+    def area(self, value: float) -> None:
+        self.__dict__['_area'] = value
+
+    @property
+    def volume(self) -> float:
+        return self.__dict__.get('_volume')
+
+    @volume.setter
+    def volume(self, value: float) -> None:
+        self.__dict__['_volume'] = value
+
+    def calculate_area(self) -> float:
         """
         calculate total surface area of the mesh
         """
@@ -102,8 +105,7 @@ class Mesh(
 
         return total_area
 
-    @property
-    def volume(self) -> float:
+    def calculate_volume(self) -> float:
         """
         calculate volume of the mesh if it is closed
         """

src/specklepy/objects/geometry/polyline.py

@@ -7,7 +7,7 @@ from specklepy.objects.interfaces import ICurve, IHasUnits
 
 
 @dataclass(kw_only=True)
-class Polyline(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Polyline"):
+class Polyline(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Polyline", serialize_ignore={"length"}):
     """
     a polyline curve, defined by a set of vertices.
     """
@@ -40,6 +40,13 @@ class Polyline(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Polyline"
 
     @property
     def length(self) -> float:
+        return self.__dict__.get('_length')
+
+    @length.setter
+    def length(self, value: float) -> None:
+        self.__dict__['_length'] = value
+
+    def calculate_length(self) -> float:
         points = self.get_points()
         total_length = 0.0
         for i in range(len(points) - 1):

src/specklepy/objects/primitive.py

@@ -4,7 +4,7 @@ from specklepy.objects.base import Base
 
 
 @dataclass(kw_only=True)
-class Interval(Base, speckle_type="Objects.Primitive.Interval"):
+class Interval(Base, speckle_type="Objects.Primitive.Interval", serialize_ignore={"length"}):
     start: float = 0.0
     end: float = 0.0
 
@@ -13,8 +13,17 @@ class Interval(Base, speckle_type="Objects.Primitive.Interval"):
 
     @property
     def length(self) -> float:
+        return self.__dict__.get('_length')
+
+    @length.setter
+    def length(self, value: float) -> None:
+        self.__dict__['_length'] = value
+
+    def calculate_length(self) -> float:
         return abs(self.end - self.start)
 
     @classmethod
     def unit_interval(cls) -> "Interval":
-        return cls(start=0, end=1)
+        interval = cls(start=0, end=1)
+        interval.length = interval.calculate_length()
+        return interval

src/specklepy/objects/tests/test_arc.py

@@ -71,19 +71,15 @@ def test_arc_domain(sample_arc):
 
 
 def test_arc_radius(sample_arc):
+    sample_arc.radius = sample_arc.calculate_radius()
     assert sample_arc.radius == pytest.approx(1.0)
 
 
 def test_arc_length(sample_arc):
-    # for a semicircle, length should be pi * radius
+    sample_arc.length = sample_arc.calculate_length()
     assert sample_arc.length == pytest.approx(math.pi)
 
 
-def test_arc_measure(sample_arc):
-    # for a semicircle, measure should be pi radians
-    assert sample_arc.measure == pytest.approx(math.pi)
-
-
 def test_arc_units(sample_points, sample_plane):
     start, mid, end = sample_points
     arc = Arc(

src/specklepy/objects/tests/test_line.py

@@ -42,6 +42,7 @@ def test_line_domain(sample_line):
 
 def test_line_length(sample_line):
 
+    sample_line.length = sample_line.calculate_length()
     assert sample_line.length == 5.0
 
 

src/specklepy/objects/tests/test_mesh.py

@@ -96,10 +96,6 @@ def test_mesh_vertex_count(sample_mesh):
     assert sample_mesh.vertices_count == 8  # cube has 8 vertices
 
 
-def test_mesh_face_count(sample_mesh):
-    assert sample_mesh.faces_count == 6  # cube has 6 faces
-
-
 def test_mesh_texture_coordinates_count(full_mesh):
     assert full_mesh.texture_coordinates_count == 8  # one UV per vertex
 
@@ -147,24 +143,18 @@ def test_mesh_is_closed(sample_mesh):
 
 def test_mesh_area(sample_mesh):
 
+    calculated_area = sample_mesh.calculate_area()
+    sample_mesh.area = calculated_area
     assert sample_mesh.area == pytest.approx(6.0)
 
 
 def test_mesh_volume(sample_mesh):
 
-    points = sample_mesh.get_points()
-    min_coords = [min(p.x for p in points), min(
-        p.y for p in points), min(p.z for p in points)]
-    max_coords = [max(p.x for p in points), max(
-        p.y for p in points), max(p.z for p in points)]
+    calculated_volume = sample_mesh.calculate_volume()
+    sample_mesh.volume = calculated_volume
 
-    assert all(
-        minimum == -0.5 for minimum in min_coords), "Cube minimum should be at -0.5"
-    assert all(
-        maximum == 0.5 for maximum in max_coords), "Cube maximum should be at 0.5"
-
-    volume = sample_mesh.volume
-    assert volume == pytest.approx(1.0), f"Expected volume 1.0, got {volume}"
+    # Verify volume is set correctly
+    assert sample_mesh.volume == pytest.approx(1.0)
 
 
 def test_mesh_invalid_vertices():

src/specklepy/objects/tests/test_polyline.py

@@ -65,11 +65,13 @@ def test_polyline_is_closed_with_tolerance(open_square_coords):
 
 
 def test_polyline_length_open(sample_polyline):
+    sample_polyline.length = sample_polyline.calculate_length()
     assert sample_polyline.length == 3.0
 
 
 def test_polyline_length_closed(closed_square_coords):
     polyline = Polyline(value=closed_square_coords, units=Units.m)
+    polyline.length = polyline.calculate_length()
     assert polyline.length == 4.0