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// -*- coding: utf-8 -*-
//
// Copyright 2021 Michael Buesch <m@bues.ch>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
use crate::coord::{Coord, CoordAxis};
use crate::coord;
pub const BOARD_WIDTH: CoordAxis = 5;
pub const BOARD_HEIGHT: CoordAxis = 7;
pub const BOARD_LINES: [(Coord, Coord); 15] = [
// Vertical lines
(coord!(0, 2), coord!(0, 6)),
(coord!(1, 1), coord!(1, 6)),
(coord!(2, 0), coord!(2, 6)),
(coord!(3, 1), coord!(3, 6)),
(coord!(4, 2), coord!(4, 6)),
// Horizontal lines
(coord!(1, 1), coord!(3, 1)),
(coord!(0, 2), coord!(4, 2)),
(coord!(0, 3), coord!(4, 3)),
(coord!(0, 4), coord!(4, 4)),
(coord!(0, 5), coord!(4, 5)),
(coord!(0, 6), coord!(4, 6)),
// Diagonal lines (center)
(coord!(0, 2), coord!(4, 6)),
(coord!(0, 6), coord!(4, 2)),
// Diagonal lines (top)
(coord!(1, 1), coord!(2, 0)),
(coord!(2, 0), coord!(3, 1)),
];
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum PosType {
Invalid,
Barn,
Field,
}
macro_rules! invalid { () => { PosType::Invalid } }
macro_rules! barn { () => { PosType::Barn } }
macro_rules! field { () => { PosType::Field } }
pub const BOARD_POSITIONS: [[PosType; BOARD_WIDTH as usize]; BOARD_HEIGHT as usize] = [
[ invalid!(), invalid!(), barn!(), invalid!(), invalid!(), ],
[ invalid!(), barn!(), barn!(), barn!(), invalid!(), ],
[ field!(), barn!(), barn!(), barn!(), field!(), ],
[ field!(), field!(), field!(), field!(), field!(), ],
[ field!(), field!(), field!(), field!(), field!(), ],
[ field!(), field!(), field!(), field!(), field!(), ],
[ field!(), field!(), field!(), field!(), field!(), ],
];
/// Check if a position is on the board.
pub fn coord_is_on_board(pos: Coord) -> bool {
pos.x >= 0 && pos.x < BOARD_WIDTH &&
pos.y >= 0 && pos.y < BOARD_HEIGHT &&
BOARD_POSITIONS[pos.y as usize][pos.x as usize] != PosType::Invalid
}
/// Check if a position is on the main diagonal lines.
pub fn is_on_main_diag(pos: Coord) -> bool {
let mut x = 0;
let mut y = 2;
for _ in 0..5 {
if pos == coord!(x, y) {
return true;
}
x += 1;
y += 1;
}
let mut x = 0;
let mut y = 6;
for _ in 0..5 {
if pos == coord!(x, y) {
return true;
}
x += 1;
y -= 1;
}
false
}
pub struct BoardIterator {
x: CoordAxis,
y: CoordAxis,
}
impl BoardIterator {
pub fn new() -> BoardIterator {
BoardIterator {
x: 0,
y: 0,
}
}
}
impl Iterator for BoardIterator {
type Item = Coord;
fn next(&mut self) -> Option<Self::Item> {
loop {
let mut coord = Some(coord!(self.x, self.y));
if self.x >= BOARD_WIDTH - 1 {
self.x = 0;
if self.y >= BOARD_HEIGHT {
self.y = 0;
coord = None;
} else {
self.y += 1;
}
} else {
self.x += 1;
}
match coord {
None => break None,
Some(coord) => {
if coord_is_on_board(coord) {
break Some(coord);
}
},
}
}
}
}
pub struct BoardPosIterator {
iter: BoardIterator,
}
impl BoardPosIterator {
pub fn new() -> BoardPosIterator {
BoardPosIterator {
iter: BoardIterator::new(),
}
}
}
impl Iterator for BoardPosIterator {
type Item = (Coord, PosType);
fn next(&mut self) -> Option<Self::Item> {
match self.iter.next() {
Some(coord) =>
Some((coord, BOARD_POSITIONS[coord.y as usize][coord.x as usize])),
None => None,
}
}
}
// vim: ts=4 sw=4 expandtab
|
