line_of_sight 0.2.1

A crate for finding the line of sight on a 2D grid.
Documentation 
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#[cfg(test)]
mod tests {
    use crate::ShadowMap;
    use crate::BLOCK;
    use crate::PLAYER;

    #[test]
    fn test_raycast() {
        let mut map = ShadowMap::new_with_empty_cells(16, 17);

        let obstacles = vec![
            (3, 3),
            (4, 3),
            (5, 3),
            (8, 7),
            (8, 5),
            (6, 9),
            (6, 10),
            (6, 11),
            (7, 11),
            (7, 10),
            (7, 9),
        ];

        for obstacle in obstacles {
            map.set(obstacle.0, obstacle.1, BLOCK);
        }

        let center = (4.0, 5.0);
        map.full_scan(center, 20.0);

        map.set(4, 5, PLAYER);
        map.show();

        let expected_map = vec![
            [2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2],
            [2, 2, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2],
            [2, 2, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2],
            [2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0],
            [2, 2, 2, 2, 3, 2, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0],
            [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0],
            [2, 2, 2, 2, 2, 2, 2, 2, 1, 0, 2, 2, 2, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 2, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 0, 0, 0, 0, 2],
            [2, 2, 2, 2, 2, 2, 1, 1, 0, 2, 2, 2, 2, 0, 0, 0],
            [2, 2, 2, 2, 2, 2, 1, 1, 0, 0, 2, 2, 2, 2, 0, 0],
            [2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 2, 2, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 2, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 2, 2, 2],
            [2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 2, 2],
        ];

        for y in 0..expected_map.len() {
            for x in 0..expected_map[y].len() {
                assert_eq!(map.get(x as isize, y as isize), expected_map[y][x]);
            }
        }
    }

    #[test]
    fn test_raycast_radius() {
        let mut map = ShadowMap::new_with_empty_cells(16, 17);

        let obstacles = vec![
            (3, 3),
            (4, 3),
            (5, 3),
            (8, 7),
            (8, 5),
            (6, 9),
            (6, 10),
            (6, 11),
            (7, 11),
            (7, 10),
            (7, 9),
        ];

        for obstacle in obstacles {
            map.set(obstacle.0, obstacle.1, BLOCK);
        }

        let center = (4.0, 5.0);
        map.full_scan(center, 3.0);

        map.set(4, 5, PLAYER);
        map.show();

        let expected_map = vec![
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 2, 1, 1, 1, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 2, 2, 3, 2, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 2, 2, 2, 2, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0],
            [0, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        ];

        for y in 0..expected_map.len() {
            for x in 0..expected_map[y].len() {
                assert_eq!(map.get(x as isize, y as isize), expected_map[y][x]);
            }
        }
    }
}