Merge pull request #2293 from gdsfactory/extrude_transitions

Components can extrude transitions

docs/notebooks/03_Path_CrossSection.py

@@ -146,8 +146,9 @@
 b.plot()
 
 # %% [markdown]
-# An arbitrary cross-section can also help place components along a path.
-# This component can be useful for defining wiring vias.
+# ### Option 3: CrossSection with ComponentAlongPath
+#
+# You can also place components along a path, which is useful for wiring vias.
 
 # %%
 import gdsfactory as gf
@@ -189,13 +190,12 @@
 c.plot()
 
 # %% [markdown]
-# ## Building Paths quickly
+# ## Path
 #
-# You can pass `append()` lists of path segments.  This makes it easy to combine
-# paths very quickly.  Below we show 3 examples using this functionality:
+# You can pass `append()` lists of path segments.  This makes it easy to combine paths very quickly.
+# Below we show 3 examples using this functionality:
 #
-# **Example 1:** Assemble a complex path by making a list of Paths and passing it
-# to `append()`
+# **Example 1:** Assemble a complex path by making a list of Paths and passing it to `append()`
 
 # %%
 P = gf.Path()
@@ -603,6 +603,34 @@ def looploop(num_pts=1000):
 c.plot()
 
 
+# %% [markdown]
+# Since a Transition inherits from CrossSection you can also extrude an arbitrary Transition.
+#
+# 1. Extruding a Path
+
+# %%
+w1 = 1
+w2 = 5
+x1 = gf.get_cross_section("xs_sc", width=w1)
+x2 = gf.get_cross_section("xs_sc", width=w2)
+transition = gf.path.transition(x1, x2)
+p = gf.path.arc(radius=10)
+c = gf.path.extrude(p, transition)
+c.plot()
+
+# %% [markdown]
+# 2. Or as a CrossSection for a component
+
+# %%
+w1 = 1
+w2 = 5
+length = 10
+x1 = gf.get_cross_section("xs_sc", width=w1)
+x2 = gf.get_cross_section("xs_sc", width=w2)
+transition = gf.path.transition(x1, x2)
+c = gf.components.bend_euler(radius=10, cross_section=transition)
+c.plot()
+
 # %% [markdown]
 # ## Variable width / offset
 #

gdsfactory/cross_section.py

@@ -373,6 +373,17 @@ class Transition(CrossSection):
     cross_section2: CrossSectionSpec
     width_type: WidthTypes = "sine"
 
+    @property
+    def width(self) -> tuple[float, float]:
+        return (
+            self.cross_section1.sections[0].width,
+            self.cross_section2.sections[0].width,
+        )
+
+    @property
+    def layer(self) -> LayerSpec:
+        return self.cross_section1.sections[0].layer
+
 
 def cross_section(
     width: float = 0.5,

gdsfactory/path.py

@@ -1576,20 +1576,24 @@ def smooth(
 if __name__ == "__main__":
     import gdsfactory as gf
 
-    P = gf.path.straight(length=10)
-
-    s0 = gf.Section(
-        width=0.415, offset=0, layer=(1, 0), name="core", port_names=("o1", "o2")
-    )
-    s1 = gf.Section(width=3, offset=0, layer=(3, 0), name="slab")
-    X1 = gf.CrossSection(sections=(s0, s1))
-
-    s2 = gf.Section(
-        width=0.5, offset=0, layer=(1, 0), name="core", port_names=("o1", "o2")
-    )
-    s3 = gf.Section(width=2.0, offset=0, layer=(3, 0), name="slab")
-    X2 = gf.CrossSection(sections=(s2, s3))
-    t = gf.path.transition(X1, X2, width_type="linear")
-    c = gf.path.extrude(P, t, shear_angle_start=10, shear_angle_end=45)
-
+    # P = gf.path.straight(length=10)
+    # s0 = gf.Section(
+    #     width=0.415, offset=0, layer=(1, 0), name="core", port_names=("o1", "o2")
+    # )
+    # s1 = gf.Section(width=3, offset=0, layer=(3, 0), name="slab")
+    # X1 = gf.CrossSection(sections=(s0, s1))
+    # s2 = gf.Section(
+    #     width=0.5, offset=0, layer=(1, 0), name="core", port_names=("o1", "o2")
+    # )
+    # s3 = gf.Section(width=2.0, offset=0, layer=(3, 0), name="slab")
+    # X2 = gf.CrossSection(sections=(s2, s3))
+    # t = gf.path.transition(X1, X2, width_type="linear")
+    # c = gf.path.extrude(P, t, shear_angle_start=10, shear_angle_end=45)
+
+    w1 = 1
+    w2 = 5
+    x1 = gf.get_cross_section("xs_sc", width=w1)
+    x2 = gf.get_cross_section("xs_sc", width=w2)
+    trans = gf.path.transition(x1, x2)
+    c = gf.components.bend_euler(radius=10, cross_section=trans)
     c.show(show_ports=True)

tests/test_cross_section.py

@@ -137,6 +137,18 @@ def test_cross_section_mirror() -> None:
         assert s1.offset == -s2.offset, f"{s1.offset} != {s2.offset}"
 
 
+def test_extrude_transition_component():
+    w1 = 1
+    w2 = 5
+    x1 = gf.get_cross_section("xs_sc", width=w1)
+    x2 = gf.get_cross_section("xs_sc", width=w2)
+    trans = gf.path.transition(x1, x2)
+    c = gf.components.bend_euler(radius=10, cross_section=trans)
+    assert c["o1"].width == w1
+    assert c["o2"].width == w2
+
+
 if __name__ == "__main__":
     # test_transition_names()
-    test_copy()
+    # test_copy()
+    test_extrude_transition_component()