61 lines
1.6 KiB
Rust
61 lines
1.6 KiB
Rust
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// Copyright 2013-2014 The CGMath Developers. For a full listing of the authors,
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// refer to the AUTHORS file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Generic spatial bounds.
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use aabb::{Aabb, Aabb3};
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use num::BaseNum;
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use plane::Plane;
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use point::{Point, Point3};
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/// Spatial relation between two objects.
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pub enum Relation {
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/// Completely inside
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In,
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/// Crosses the boundary
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Cross,
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/// Completely outside
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Out,
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}
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/// Generic bound.
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pub trait Bound<S> {
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/// Classify the spatial relation with a plane
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fn relate(&self, &Plane<S>) -> Relation;
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}
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impl<S: BaseNum> Bound<S> for Point3<S> {
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fn relate(&self, plane: &Plane<S>) -> Relation {
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let dist = self.dot(&plane.n);
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if dist > plane.d {
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Relation::In
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}else if dist < plane.d {
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Relation::Out
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}else {
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Relation::Cross
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}
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}
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}
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impl<S: BaseNum> Bound<S> for Aabb3<S> {
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fn relate(&self, plane: &Plane<S>) -> Relation {
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match (self.min.relate(plane), self.max.relate(plane)) {
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(Relation::In, Relation::In) => Relation::In,
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(Relation::Out, Relation::Out) => Relation::Out,
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(_, _) => Relation::Cross,
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}
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}
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}
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