rene 0.2.0

Computational geometry.
Documentation 
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use crate::bounded::{Bounded, Box};
use crate::clipping::shaped::Operation;
use crate::clipping::traits::ReduceEvents;
use crate::clipping::{Event, UNION};
use crate::geometries::{Empty, Multipolygon, Point};
use crate::operations::{
    do_boxes_have_no_common_continuum, flags_to_false_indices,
    flags_to_true_indices, to_boxes_have_common_continuum,
};
use crate::relatable::Relatable;
use crate::traits::{Elemental, Iterable, Lengthsome, Multipolygonal, Union};

use super::types::Polygon;

impl<Scalar> Union<Empty> for Polygon<Scalar> {
    type Output = Self;

    fn union(self, _other: Empty) -> Self::Output {
        self
    }
}

impl<Scalar> Union<&Empty> for Polygon<Scalar> {
    type Output = Self;

    fn union(self, _other: &Empty) -> Self::Output {
        self
    }
}

impl<Scalar> Union<Empty> for &Polygon<Scalar>
where
    Polygon<Scalar>: Clone,
{
    type Output = Polygon<Scalar>;

    fn union(self, _other: Empty) -> Self::Output {
        self.clone()
    }
}

impl<Scalar> Union<&Empty> for &Polygon<Scalar>
where
    Polygon<Scalar>: Clone,
{
    type Output = Polygon<Scalar>;

    fn union(self, _other: &Empty) -> Self::Output {
        self.clone()
    }
}

impl<Scalar> Union for &Polygon<Scalar>
where
    Scalar: PartialEq,
    Operation<Point<Scalar>, UNION>: Iterator<Item = Event>
        + ReduceEvents<Output = Vec<Polygon<Scalar>>>
        + for<'a> From<(&'a Polygon<Scalar>, &'a Polygon<Scalar>)>,
    Polygon<Scalar>: Clone,
    for<'a, 'b> &'a Box<&'b Scalar>: Relatable,
    for<'a> &'a Point<Scalar>: Elemental<Coordinate = &'a Scalar>,
    for<'a> &'a Polygon<Scalar>: Bounded<&'a Scalar>,
{
    type Output = Vec<Polygon<Scalar>>;

    fn union(self, other: Self) -> Self::Output {
        let bounding_box = self.to_bounding_box();
        let other_bounding_box = other.to_bounding_box();
        if do_boxes_have_no_common_continuum(
            &bounding_box,
            &other_bounding_box,
        ) {
            return vec![self.clone(), other.clone()];
        }
        let mut operation = Operation::<Point<_>, UNION>::from((self, other));
        let mut events = {
            let (_, maybe_events_count) = operation.size_hint();
            debug_assert!(maybe_events_count.is_some());
            Vec::with_capacity(unsafe {
                maybe_events_count.unwrap_unchecked()
            })
        };
        for event in operation.by_ref() {
            events.push(event);
        }
        operation.reduce_events(events)
    }
}

impl<Scalar> Union<&Multipolygon<Scalar>> for &Polygon<Scalar>
where
    Scalar: Clone + Ord,
    Operation<Point<Scalar>, UNION>: Iterator<Item = Event>
        + ReduceEvents<Output = Vec<Polygon<Scalar>>>
        + for<'a> From<(&'a Polygon<Scalar>, &'a [&'a Polygon<Scalar>])>,
    Point<Scalar>: Elemental<Coordinate = Scalar>,
    Polygon<Scalar>: Clone,
    for<'a, 'b> &'a Box<&'b Scalar>: Relatable,
    for<'a> &'a Multipolygon<Scalar>: Bounded<&'a Scalar>,
    for<'a> &'a Polygon<Scalar>: Bounded<&'a Scalar>,
{
    type Output = Vec<Polygon<Scalar>>;

    fn union(self, other: &Multipolygon<Scalar>) -> Self::Output {
        let bounding_box = self.to_bounding_box();
        let other_bounding_box = other.to_bounding_box();
        let other_polygons = other.polygons();
        if do_boxes_have_no_common_continuum(
            &bounding_box,
            &other_bounding_box,
        ) {
            let mut result =
                other_polygons.into_iter().cloned().collect::<Vec<_>>();
            result.push(self.clone());
            return result;
        }
        let other_bounding_boxes = other_polygons
            .iter()
            .map(Bounded::to_bounding_box)
            .collect::<Vec<_>>();
        let other_boxes_have_common_continuum = to_boxes_have_common_continuum(
            &other_bounding_boxes,
            &other_bounding_box,
        );
        let other_common_continuum_polygons_ids =
            flags_to_true_indices(&other_boxes_have_common_continuum);
        if other_common_continuum_polygons_ids.is_empty() {
            let mut result =
                other_polygons.into_iter().cloned().collect::<Vec<_>>();
            result.push(self.clone());
            return result;
        }
        let other_common_continuum_polygons =
            other_common_continuum_polygons_ids
                .into_iter()
                .map(|index| &other_polygons[index])
                .collect::<Vec<_>>();
        let mut operation = Operation::<Point<_>, UNION>::from((
            self,
            &other_common_continuum_polygons,
        ));
        let mut events = {
            let (_, maybe_events_count) = operation.size_hint();
            debug_assert!(maybe_events_count.is_some());
            Vec::with_capacity(unsafe {
                maybe_events_count.unwrap_unchecked()
            })
        };
        for event in operation.by_ref() {
            events.push(event);
        }
        let mut result = operation.reduce_events(events);
        result.reserve(
            other_polygons.len() - other_common_continuum_polygons.len(),
        );
        result.extend(
            flags_to_false_indices(&other_boxes_have_common_continuum)
                .into_iter()
                .map(|index| other_polygons[index].clone()),
        );
        result
    }
}