Merge pull request #594 from daemacles/jay/add_helix_example

Add Ex025 for sweeping a wire along a helix from cq.Wire.makeHelix()

Author: jmwright

examples/Ex025_Swept_Helix.py

@@ -0,0 +1,20 @@
+import cadquery as cq
+
+r = 0.5  # Radius of the helix
+p = 0.4  # Pitch of the helix - vertical distance between loops
+h = 2.4  # Height of the helix - total height
+
+# Helix
+wire = cq.Wire.makeHelix(pitch=p, height=h, radius=r)
+helix = cq.Workplane(obj=wire)
+
+# Final result: A 2D shape swept along a helix.
+result = (
+    cq.Workplane("XZ")  # helix is moving up the Z axis
+    .center(r, 0)  # offset isosceles trapezoid
+    .polyline(((-0.15, 0.1), (0.0, 0.05), (0, 0.35), (-0.15, 0.3)))
+    .close()  # make edges a wire
+    .sweep(helix, isFrenet=True)  # Frenet keeps orientation as expected
+)
+
+show_object(result)