nhf/parts/planar.py

@@ -0,0 +1,36 @@
+"""
+Operations on planar geometry (usually used for laser cutting parts)
+"""
+import math
+from typing import Tuple
+import cadquery as Cq
+
+def extrude_with_markers(
+        sketch: Cq.Sketch,
+        thickness: float,
+        tags: list[Tuple[str, Cq.Location]],
+        reverse: bool = False):
+    """
+    Extrudes a sketch and place tags on the sketch for mating.
+
+    Each tag is of the format `(name, loc)`, where the (must be 2d) location's
+    angle is specifies in degrees counterclockwise from +X. Two marks are
+    generated for each `name`, "{name}" for the location (with normal) and
+    "{name}_dir" for the directrix specified by the angle.
+
+    This simulates a process of laser cutting and bonding (for wood and acrylic)
+    """
+    result = (
+        Cq.Workplane('XY')
+        .placeSketch(sketch)
+        .extrude(thickness)
+    )
+    plane = result.faces("<Z" if reverse else ">Z").workplane()
+    sign = -1 if reverse else 1
+    for tag, p in tags:
+        (x, y), angle = p.to2d()
+        theta = sign * math.radians(angle)
+        direction = (math.cos(theta), math.sin(theta), 0)
+        plane.moveTo(x, sign * y).tagPlane(tag)
+        plane.moveTo(x, sign * y).tagPlane(f"{tag}_dir", direction)
+    return result

nhf/touhou/houjuu_nue/wing.py

@@ -12,6 +12,7 @@ from nhf.build import Model, TargetKind, target, assembly, submodel
 from nhf.parts.box import box_with_centre_holes, MountingBox, Hole
 from nhf.parts.joints import HirthJoint
 from nhf.touhou.houjuu_nue.joints import ShoulderJoint, ElbowJoint, DiskJoint
+from nhf.parts.planar import extrude_with_markers
 import nhf.utils
 
 @dataclass(kw_only=True)
@@ -300,13 +301,13 @@ class WingProfile(Model):
         c, s = math.cos(-theta), math.sin(-theta)
         tags = [
             # transforms [axle_dist, -sw/2] about the centre (tip_x, tip_y - sw/2)
-            ("shoulder", (
+            ("shoulder", Cq.Location.from2d(
                 self.shoulder_tip_x          + axle_dist * c + (-sw/2) * s,
-                self.shoulder_tip_y - sw / 2 - axle_dist * s + (-sw/2) * c),
-             self.shoulder_joint.angle_neutral),
-            ("base", (base_dx,  base_dy), 90),
+                self.shoulder_tip_y - sw / 2 - axle_dist * s + (-sw/2) * c,
+                self.shoulder_joint.angle_neutral)),
+            ("base", Cq.Location.from2d(base_dx,  base_dy, 90)),
         ]
-        result = nhf.utils.extrude_with_markers(
+        result = extrude_with_markers(
             self.profile_s0(),
             self.panel_thickness,
             tags,
@@ -453,21 +454,21 @@ class WingProfile(Model):
         shoulder_h = self.shoulder_joint.child_height
         h = (self.shoulder_joint.height - shoulder_h) / 2
         tags_shoulder = [
-            ("shoulder_bot", (0, h), 90),
-            ("shoulder_top", (0, h + shoulder_h), 270),
+            ("shoulder_bot", Cq.Location.from2d(0, h, 90)),
+            ("shoulder_top", Cq.Location.from2d(0, h + shoulder_h, 270)),
         ]
         h = self.elbow_height / 2
         tags_elbow = [
-            ("elbow_bot",
-             self.elbow_to_abs(-self.elbow_joint.parent_arm_radius, h - self.elbow_h2),
-             self.elbow_angle + 0),
-            ("elbow_top",
-             self.elbow_to_abs(-self.elbow_joint.parent_arm_radius, h + self.elbow_h2),
-             self.elbow_angle + 0),
+            ("elbow_bot", Cq.Location.from2d(
+             *self.elbow_to_abs(-self.elbow_joint.parent_arm_radius, h - self.elbow_h2),
+             self.elbow_angle + 0)),
+            ("elbow_top", Cq.Location.from2d(
+             *self.elbow_to_abs(-self.elbow_joint.parent_arm_radius, h + self.elbow_h2),
+             self.elbow_angle + 0)),
         ]
         profile = self.profile_s1()
         tags = tags_shoulder + tags_elbow
-        return nhf.utils.extrude_with_markers(
+        return extrude_with_markers(
             profile, self.panel_thickness, tags, reverse=front)
     @submodel(name="spacer-s1-shoulder")
     def spacer_s1_shoulder(self) -> MountingBox:
@@ -526,25 +527,25 @@ class WingProfile(Model):
     def surface_s2(self, front: bool = True) -> Cq.Workplane:
         h = self.elbow_height / 2
         tags_elbow = [
-            ("elbow_bot",
-             self.elbow_to_abs(self.elbow_joint.child_arm_radius, h - self.elbow_h2),
-             self.elbow_angle + 180),
-            ("elbow_top",
-             self.elbow_to_abs(self.elbow_joint.child_arm_radius, h + self.elbow_h2),
-             self.elbow_angle + 180),
+            ("elbow_bot", Cq.Location.from2d(
+                *self.elbow_to_abs(self.elbow_joint.child_arm_radius, h - self.elbow_h2),
+                self.elbow_angle + 180)),
+            ("elbow_top", Cq.Location.from2d(
+                *self.elbow_to_abs(self.elbow_joint.child_arm_radius, h + self.elbow_h2),
+                self.elbow_angle + 180)),
         ]
         h = self.wrist_height / 2
         tags_wrist = [
-            ("wrist_bot",
-             self.wrist_to_abs(-self.wrist_joint.parent_arm_radius, h - self.wrist_h2),
-             self.wrist_angle),
-            ("wrist_top",
-             self.wrist_to_abs(-self.wrist_joint.parent_arm_radius, h + self.wrist_h2),
-             self.wrist_angle),
+            ("wrist_bot", Cq.Location.from2d(
+                *self.wrist_to_abs(-self.wrist_joint.parent_arm_radius, h - self.wrist_h2),
+                self.wrist_angle)),
+            ("wrist_top", Cq.Location.from2d(
+                *self.wrist_to_abs(-self.wrist_joint.parent_arm_radius, h + self.wrist_h2),
+                self.wrist_angle)),
         ]
         profile = self.profile_s2()
         tags = tags_elbow + tags_wrist
-        return nhf.utils.extrude_with_markers(profile, self.panel_thickness, tags, reverse=front)
+        return extrude_with_markers(profile, self.panel_thickness, tags, reverse=front)
     @submodel(name="spacer-s2-elbow")
     def spacer_s2_elbow(self) -> MountingBox:
         return self.spacer_of_joint(
@@ -596,15 +597,15 @@ class WingProfile(Model):
                    front: bool = True) -> Cq.Workplane:
         h = self.wrist_height / 2
         tags = [
-            ("wrist_bot",
-             self.wrist_to_abs(self.wrist_joint.child_arm_radius, h - self.wrist_h2),
-             self.wrist_angle + 180),
-            ("wrist_top",
-             self.wrist_to_abs(self.wrist_joint.child_arm_radius, h + self.wrist_h2),
-             self.wrist_angle + 180),
+            ("wrist_bot", Cq.Location.from2d(
+                *self.wrist_to_abs(self.wrist_joint.child_arm_radius, h - self.wrist_h2),
+                self.wrist_angle + 180)),
+            ("wrist_top", Cq.Location.from2d(
+                *self.wrist_to_abs(self.wrist_joint.child_arm_radius, h + self.wrist_h2),
+                self.wrist_angle + 180)),
         ]
         profile = self.profile_s3()
-        return nhf.utils.extrude_with_markers(profile, self.panel_thickness, tags, reverse=front)
+        return extrude_with_markers(profile, self.panel_thickness, tags, reverse=front)
     @submodel(name="spacer-s3-wrist")
     def spacer_s3_wrist(self) -> MountingBox:
         return self.spacer_of_joint(

nhf/utils.py

@@ -1,9 +1,5 @@
 """
-Marking utilities for `Cq.Workplane`
-
-Adds the functions to `Cq.Workplane`:
-1. `tagPoint`
-2. `tagPlane`
+Utility functions for cadquery objects
 """
 import math
 import functools
@@ -170,32 +166,3 @@ def get_abs_location(self: Cq.Assembly,
     return loc
 
 Cq.Assembly.get_abs_location = get_abs_location
-
-
-def extrude_with_markers(sketch: Cq.Sketch,
-                         thickness: float,
-                         tags: list[Tuple[str, Tuple[float, float], float]],
-                         reverse: bool = False):
-    """
-    Extrudes a sketch and place tags on the sketch for mating.
-
-    Each tag is of the format `(name, (x, y), angle)`, where the angle is
-    specifies in degrees counterclockwise from +X. Two marks are generated for
-    each `name`, "{name}" for the location (with normal) and "{name}_dir" for
-    the directrix specified by the angle.
-
-    This simulates a process of laser cutting and bonding (for wood and acrylic)
-    """
-    result = (
-        Cq.Workplane('XY')
-        .placeSketch(sketch)
-        .extrude(thickness)
-    )
-    plane = result.faces("<Z" if reverse else ">Z").workplane()
-    sign = -1 if reverse else 1
-    for tag, (px, py), angle in tags:
-        theta = sign * math.radians(angle)
-        direction = (math.cos(theta), math.sin(theta), 0)
-        plane.moveTo(px, sign * py).tagPlane(tag)
-        plane.moveTo(px, sign * py).tagPlane(f"{tag}_dir", direction)
-    return result