From 7331d681538d2bd2e3ddd9846fac0bdf1862097a Mon Sep 17 00:00:00 2001
From: Lorenz Neureuter <hello@lorenz.space>
Date: Sun, 17 Oct 2021 18:46:54 -0400
Subject: [PATCH 1/2] paramAt - handle trimmed curves (#686)

---
 cadquery/occ_impl/shapes.py |  2 +-
 tests/test_cadquery.py      | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/cadquery/occ_impl/shapes.py b/cadquery/occ_impl/shapes.py
index 5de129f20..8123587c6 100644
--- a/cadquery/occ_impl/shapes.py
+++ b/cadquery/occ_impl/shapes.py
@@ -1341,7 +1341,7 @@ def paramAt(self: Mixin1DProtocol, d: float) -> float:
         curve = self._geomAdaptor()
 
         l = GCPnts_AbscissaPoint.Length_s(curve)
-        return GCPnts_AbscissaPoint(curve, l * d, 0).Parameter()
+        return GCPnts_AbscissaPoint(curve, l * d, curve.FirstParameter()).Parameter()
 
     def tangentAt(
         self: Mixin1DProtocol,
diff --git a/tests/test_cadquery.py b/tests/test_cadquery.py
index 5c37b3bc5..7cdbb511d 100644
--- a/tests/test_cadquery.py
+++ b/tests/test_cadquery.py
@@ -4597,6 +4597,19 @@ def testPositionAt(self):
         self.assertTupleAlmostEquals(p0.toTuple(), p2.toTuple(), 6)
         self.assertTupleAlmostEquals(p1.toTuple(), (0, 1, 0), 6)
 
+        # test with arc of circle
+        e = Edge.makeCircle(1, (0, 0, 0), (0, 0, 1), 90, 180)
+        p0 = e.positionAt(0.0)
+        p1 = e.positionAt(1.0)
+        assert p0.toTuple() == approx((0.0, 1.0, 0.0))
+        assert p1.toTuple() == approx((-1.0, 0.0, 0.0))
+
+        w = Wire.assembleEdges([e])
+        p0 = w.positionAt(0.0)
+        p1 = w.positionAt(1.0)
+        assert p0.toTuple() == approx((0.0, 1.0, 0.0))
+        assert p1.toTuple() == approx((-1.0, 0.0, 0.0))
+
     def testTangengAt(self):
 
         pts = [(0, 0), (-1, 1), (-2, 0), (-1, 0)]

From 7413044ab13e7fd93f744b17bce0585f7bdfc07a Mon Sep 17 00:00:00 2001
From: AU <adam-urbanczyk@users.noreply.github.com>
Date: Tue, 19 Oct 2021 08:54:37 +0200
Subject: [PATCH 2/2] Pin HDF5 for now

---
 conda/meta.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/conda/meta.yaml b/conda/meta.yaml
index c402c3849..edccc18e0 100644
--- a/conda/meta.yaml
+++ b/conda/meta.yaml
@@ -16,6 +16,7 @@ requirements:
   run:
     - python {{ environ.get('PYTHON_VERSION') }}
     - ocp 7.5.2
+    - hdf5 1.10.6 *1114
     - pyparsing 2.*
     - ezdxf
     - ipython