Enhancing Triangle Issue#765

src/build123d/objects_sketch.py

@@ -37,7 +37,17 @@ from build123d.build_common import LocationList, flatten_sequence, validate_inpu
 from build123d.build_enums import Align, FontStyle, Mode
 from build123d.build_sketch import BuildSketch
 from build123d.geometry import Axis, Location, Rotation, Vector, VectorLike
-from build123d.topology import Compound, Edge, Face, ShapeList, Sketch, Wire, tuplify
+from build123d.topology import (
+    Compound,
+    Edge,
+    Face,
+    ShapeList,
+    Sketch,
+    Wire,
+    tuplify,
+    TOLERANCE,
+    topo_explore_common_vertex,
+)
 
 
 class BaseSketchObject(Sketch):
@@ -720,3 +730,25 @@ class Triangle(BaseSketchObject):
         triangle.move(Location(-center_of_geometry))
         alignment = None if align is None else tuplify(align, 2)
         super().__init__(obj=triangle, rotation=rotation, align=alignment, mode=mode)
+        self.edge_a = self.edges().filter_by(lambda e: abs(e.length - a) < TOLERANCE)[
+            0
+        ]  #: edge 'a'
+        self.edge_b = self.edges().filter_by(
+            lambda e: abs(e.length - b) < TOLERANCE and e not in [self.edge_a]
+        )[
+            0
+        ]  #: edge 'b'
+        self.edge_c = self.edges().filter_by(
+            lambda e: e not in [self.edge_a, self.edge_b]
+        )[
+            0
+        ]  #: edge 'c'
+        self.vertex_A = topo_explore_common_vertex(
+            self.edge_b, self.edge_c
+        )  #: vertex 'A'
+        self.vertex_B = topo_explore_common_vertex(
+            self.edge_a, self.edge_c
+        )  #: vertex 'B'
+        self.vertex_C = topo_explore_common_vertex(
+            self.edge_a, self.edge_b
+        )  #: vertex 'C'

tests/test_build_sketch.py

@@ -27,7 +27,7 @@ license:
 """
 
 import unittest
-from math import pi, sqrt
+from math import pi, sqrt, atan2, degrees
 from build123d import *
 
 
@@ -395,8 +395,21 @@ class TestBuildSketchObjects(unittest.TestCase):
         self.assertAlmostEqual(test.sketch.area, 8 * (12 + 4) / 2, 5)
 
     def test_triangle(self):
-        tri = Triangle(a=3, b=4, c=5)
+        tri = Triangle(a=3, b=4, c=5, align=Align.MIN)
         self.assertAlmostEqual(tri.area, (3 * 4) / 2, 5)
+        self.assertAlmostEqual(tri.A, degrees(atan2(3, 4)), 5)
+        self.assertAlmostEqual(tri.B, degrees(atan2(4, 3)), 5)
+        self.assertAlmostEqual(tri.C, 90, 5)
+        self.assertAlmostEqual(tri.a, 3, 5)
+        self.assertAlmostEqual(tri.b, 4, 5)
+        self.assertAlmostEqual(tri.c, 5, 5)
+        self.assertAlmostEqual(tri.edge_a.length, 3, 5)
+        self.assertAlmostEqual(tri.edge_b.length, 4, 5)
+        self.assertAlmostEqual(tri.edge_c.length, 5, 5)
+        self.assertTupleAlmostEquals(tri.vertex_A, (3, 4, 0), 5)
+        self.assertTupleAlmostEquals(tri.vertex_B, (0, 0, 0), 5)
+        self.assertTupleAlmostEquals(tri.vertex_C, (3, 0, 0), 5)
+
         tri = Triangle(c=5, C=90, a=3)
         self.assertAlmostEqual(tri.area, (3 * 4) / 2, 5)