collider 0.3.1

A library for continuous 2D collision detection for game developement
Documentation 
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// Copyright 2016-2018 Matthew D. Michelotti
//
// 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.

use geom::*;

#[test]
fn test_circle_advance() {
    let shape_1 = Shape::circle(2.0).place(v2(3.0, 5.0));
    assert_eq!(shape_1.advance(v2(1.0, 2.0), v2(-0.25, -0.25), 2.0), Shape::circle(1.5).place(v2(5.0, 9.0)));
}

#[test]
fn test_rect_advance() {
    let shape_1 = Shape::rect(v2(2.0, 5.0)).place(v2(3.0, 5.0));
    assert_eq!(shape_1.advance(v2(1.0, 2.0), v2(-0.25, 1.0), 2.0), Shape::rect(v2(1.5, 7.0)).place(v2(5.0, 9.0)));
}

#[test]
#[should_panic]
fn test_illegal_circle_advance() {
    let shape = Shape::circle(2.0).place(v2(3.0, 5.0));
    shape.advance(v2(1.0, 2.0), v2(-0.25, -0.24), 2.0);
}

#[test]
fn test_edges() {
    let shape = Shape::rect(v2(4.0, 6.0)).place(v2(3.0, 5.0));
    assert_eq!(shape.min_x(), 1.0);
    assert_eq!(shape.min_y(), 2.0);
    assert_eq!(shape.max_x(), 5.0);
    assert_eq!(shape.max_y(), 8.0);
}

#[test]
fn test_rect_rect_normal() {
    let src = Shape::rect(v2(4.0, 4.0)).place(v2(1.0, 1.0));
    let dst = Shape::rect(v2(8.0, 8.0)).place(v2(2.0, 1.5));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(1.0, 0.0), 5.0));
    let dst = Shape::rect(v2(8.0, 8.0)).place(v2(0.0, 0.5));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(-1.0, 0.0), 5.0));
    let dst = Shape::rect(v2(4.0, 2.0)).place(v2(3.8, 4.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(0.0, 1.0), 0.0));
    let dst = Shape::rect(v2(8.0, 2.0)).place(v2(-2.0, -3.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(0.0, -1.0), -1.0));
}

#[test]
fn test_circle_circle_normal() {
    let src = Shape::circle(2.0).place(v2(1.0, 1.0));
    let dst = Shape::circle(3.0).place(v2(2.0, 0.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(1.0, -1.0), 2.5 - (2.0f64).sqrt()));
}

#[test]
fn test_rect_circle_normal() {
    let src = Shape::rect(v2(2.0, 2.0)).place(v2(0.0, 0.0));

    let dst = Shape::circle(2.5).place(v2(-2.0, 0.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(-1.0, 0.0), 0.25));
    let dst = Shape::circle(2.5).place(v2(0.0, -2.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(0.0, -1.0), 0.25));
    let dst = Shape::circle(2.5).place(v2(2.0, 0.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(1.0, 0.0), 0.25));
    let dst = Shape::circle(2.5).place(v2(0.0, 2.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(0.0, 1.0), 0.25));

    let dst = Shape::circle(2.5).place(v2(-2.0, -2.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(-1.0, -1.0), 1.25 - (2.0f64).sqrt()));
    let dst = Shape::circle(2.5).place(v2(2.0, -2.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(1.0, -1.0), 1.25 - (2.0f64).sqrt()));
    let dst = Shape::circle(2.5).place(v2(-2.0, 2.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(-1.0, 1.0), 1.25 - (2.0f64).sqrt()));
    let dst = Shape::circle(2.5).place(v2(2.0, 2.0));
    assert_eq!(dst.normal_from(&src), DirVec2::new(v2(1.0, 1.0), 1.25 - (2.0f64).sqrt()));
}

#[test]
fn test_masked_rect_rect_normal() {
    let src = Shape::rect(v2(4.0, 4.0)).place(v2(1.0, 1.0));
    let dst = Shape::rect(v2(8.0, 8.0)).place(v2(6.0, -5.0));
    let mut mask = CardMask::full();
    assert_eq!(dst.masked_normal_from(&src, mask), DirVec2::new(v2(0.0, -1.0), 0.0));
    mask[Card::MinusY] = false;
    assert_eq!(dst.masked_normal_from(&src, mask), DirVec2::new(v2(1.0, 0.0), 1.0));
}

#[test]
fn test_masked_rect_circle_normal() {
    let src = Shape::rect(v2(2.0, 2.0)).place(v2(0.0, 0.0));
    let dst = Shape::circle(2.5).place(v2(-2.0, 2.0));
    let mut mask = CardMask::full();
    assert_eq!(dst.masked_normal_from(&src, mask), DirVec2::new(v2(-1.0, 1.0), 1.25 - (2.0f64).sqrt()));
    mask[Card::PlusX] = false;
    assert_eq!(src.masked_normal_from(&dst, mask.flip()), DirVec2::new(v2(1.0, -1.0), 1.25 - (2.0f64).sqrt()));
    assert_eq!(dst.masked_normal_from(&src, mask), DirVec2::new(v2(-1.0, 1.0), 1.25 - (2.0f64).sqrt()));
    mask[Card::PlusY] = false;
    assert_eq!(dst.masked_normal_from(&src, mask), DirVec2::new(v2(-1.0, 0.0), 0.25));
}

#[test]
fn test_rect_rect_contact() {
    let a = Shape::rect(v2(4.0, 2.0)).place(v2(4.0, 10.0));
    let b = Shape::rect(v2(2.0, 4.0)).place(v2(-2.0, 12.0));
    assert_eq!(a.contact_point(&b), v2(0.5, 10.5));
    assert_eq!(b.contact_point(&a), v2(0.5, 10.5));
}

#[test]
fn test_circle_circle_contact() {
    let a = Shape::circle(2.0).place(v2(5.0, 15.0));
    let b = Shape::circle(8.0).place(v2(5.0, 19.0));
    assert_eq!(a.contact_point(&b), v2(5.0, 15.5));
    assert_eq!(b.contact_point(&a), v2(5.0, 15.5));
}

#[test]
fn test_circle_rect_contact() {
    let a = Shape::circle(2.0).place(v2(5.0, 15.0));
    let b = Shape::rect(v2(4.0, 8.0)).place(v2(2.0, 18.0));
    assert_eq!(a.contact_point(&b), v2(4.0, 15.0));
    assert_eq!(b.contact_point(&a), v2(4.0, 15.0));
}