"""

name: key_cap.py
by:   Gumyr
date: September 20th 2022

desc:

    This example demonstrates the design of a Cherry MX key cap by using
    extrude with a taper and extrude until next.

    See: https://www.cherrymx.de/en/dev.html

license:

    Copyright 2022 Gumyr

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
"""
from build123d import *

with BuildPart() as key_cap:
    # Start with the plan of the key cap and extrude it
    with BuildSketch() as plan:
        Rectangle(18 * MM, 18 * MM)
    extrude(amount=10 * MM, taper=15)
    # Create a dished top
    with Locations((0, -3 * MM, 47 * MM)):
        Sphere(40 * MM, mode=Mode.SUBTRACT, rotation=(90, 0, 0))
    # Fillet all the edges except the bottom
    fillet(
        *key_cap.edges().filter_by_position(
            Axis.Z, 0, 30 * MM, inclusive=(False, True)
        ),
        radius=1 * MM,
    )
    # Hollow out the key by subtracting a scaled version
    scale(by=(0.925, 0.925, 0.85), mode=Mode.SUBTRACT)

    # Add supporting ribs while leaving room for switch activation
    with BuildSketch(Plane(origin=(0, 0, 4 * MM))):
        Rectangle(15 * MM, 0.5 * MM)
        Rectangle(0.5 * MM, 15 * MM)
        Circle(radius=5.5 * MM / 2)
    # Extrude the mount and ribs to the key cap underside
    extrude(until=Until.NEXT)
    # Find the face on the bottom of the ribs to build onto
    rib_bottom = key_cap.faces().filter_by_position(Axis.Z, 4 * MM, 4 * MM)[0]
    # Add the switch socket
    with BuildSketch(rib_bottom) as cruciform:
        Circle(radius=5.5 * MM / 2)
        Rectangle(4.1 * MM, 1.17 * MM, mode=Mode.SUBTRACT)
        Rectangle(1.17 * MM, 4.1 * MM, mode=Mode.SUBTRACT)
    extrude(amount=3.5 * MM, mode=Mode.ADD)

assert abs(key_cap.part.volume - 644.8900473617498) < 1e-3

if "show_object" in locals():
    show_object(key_cap.part.wrapped, name="key cap", options={"alpha": 0.7})