fj-kernel 0.46.0

Early-stage, next-generation, code-first CAD application. Because the world needs another CAD program.
Documentation 
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use std::array;

use crate::{
    objects::{Cycle, Face},
    operations::Polygon,
    storage::Handle,
};

/// Update a [`Face`]
pub trait UpdateFace {
    /// Update the exterior of the face
    fn update_exterior(
        &self,
        f: impl FnOnce(&Handle<Cycle>) -> Handle<Cycle>,
    ) -> Self;

    /// Add the provides interiors to the face
    fn add_interiors(
        &self,
        interiors: impl IntoIterator<Item = Handle<Cycle>>,
    ) -> Self;
}

impl UpdateFace for Face {
    fn update_exterior(
        &self,
        f: impl FnOnce(&Handle<Cycle>) -> Handle<Cycle>,
    ) -> Self {
        let exterior = f(self.exterior());

        Face::new(
            self.surface().clone(),
            exterior,
            self.interiors().cloned(),
            self.color(),
        )
    }

    fn add_interiors(
        &self,
        interiors: impl IntoIterator<Item = Handle<Cycle>>,
    ) -> Self {
        let interiors = self.interiors().cloned().chain(interiors);

        Face::new(
            self.surface().clone(),
            self.exterior().clone(),
            interiors,
            self.color(),
        )
    }
}

impl<const D: usize> UpdateFace for Polygon<D> {
    fn update_exterior(
        &self,
        f: impl FnOnce(&Handle<Cycle>) -> Handle<Cycle>,
    ) -> Self {
        let face = self.face.update_exterior(f);
        let edges = array::from_fn(|i| {
            face.exterior()
                .nth_half_edge(i)
                .expect("Operation should not have changed length of cycle")
                .clone()
        });
        let vertices = array::from_fn(|i| {
            // The duplicated code here is unfortunate, but unless we get a
            // stable `array::each_ref` and something like `array::unzip`, I'm
            // not sure how to avoid it.
            face.exterior()
                .nth_half_edge(i)
                .expect("Operation should not have changed length of cycle")
                .start_vertex()
                .clone()
        });

        Polygon {
            face,
            edges,
            vertices,
        }
    }

    fn add_interiors(
        &self,
        _: impl IntoIterator<Item = Handle<Cycle>>,
    ) -> Self {
        panic!("Adding interiors to `Polygon` is not supported.")
    }
}