Struct Region

struct Region {
    crop: char,
    plots: HashSet<(usize, usize)>,
    perimeter: HashSet<((usize, usize), Side)>,
}

A region that is a set of orthogonally adjacent plots in a Garden with the same crop. It stores the plots and number of units in the perimeter for use by Garden::total_fencing_cost.

Fields

crop: char

plots: HashSet<(usize, usize)>

perimeter: HashSet<((usize, usize), Side)>

Implementations

impl Region

fn new(crop: char) -> Region

Initialise an empty region

fn contains(&self, plot: &Option<(usize, usize)>) -> bool

Helper for checking if plot is in the grid. Takes an Option to match Delta::apply_to

fn check_for_corner(&self, plot: &(usize, usize), side: &Side) -> bool

Given an edge on one side of a plot. Calculate if following that edge clockwise is a corner

    +---+
    | A |
+---+ - +
| B | C |
+---+---+

There are only three cases:

• Straight - no corner: The examples above are
  • Following the Side::right of the shape from A to C.
  • Following the Side::bottom of the shape from C to B.
• Convex corner, e.g. Side::top B going to A
• Concave corner which follow the Side::left and Side::top of A, Side::bottom and Side::left of B, and the Side::right of C.

If the block straight-ahead is not set it’s a concave corner. If it is set and the one ahead and to the Side::left is also set it’s concave.

fn count_edges(&self) -> usize

For all the edges in the perimeter, check if they are followed by a corner

Trait Implementations

impl Debug for Region

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Region

fn eq(&self, other: &Region) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Region

impl StructuralPartialEq for Region