cultivar/common/src/entities/ferris.rs

use super::{traits::*, WalkError};
use crate::board::*;

#[derive(Clone, Debug)]
pub struct Ferris {
	pub position: (i32, i32),
}

impl Entity for Ferris {}

impl HasPosition for Ferris {
	fn get_position(&self) -> (i32, i32) {
		self.position
	}
}

impl Walker for Ferris {
	fn walk(
		&mut self,
		board: &Board,
		direction: Direction,
	) -> Result<Position, (Position, WalkError)> {
		let dpos = direction.to_position::<i32>();
		let new_x = self.position.0.saturating_add(dpos.0);
		let new_y = self.position.1.saturating_add(dpos.1);
		if new_x >= board.origin.0
			&& new_x < board.origin.0 + board.size.0
			&& new_y >= board.origin.1
			&& new_y < board.origin.1 + board.size.1
		{
			self.position.0 = new_x;
			self.position.1 = new_y;
			Ok(self.position)
		} else {
			Err((self.position, WalkError::OutOfBoard))
		}
	}
}