Initial layout implementation.

src/belt_finding/common.rs

@@ -1,6 +1,7 @@
 use core::panic;
 use std::io::{self, Write};
 
+use rand::prelude::Distribution;
 use termcolor::{ColorSpec, StandardStream, WriteColor};
 
 pub type PositionType = i32;
@@ -89,6 +90,19 @@ impl Direction {
     }
 }
 
+impl Distribution<Direction> for rand::distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> Direction {
+        let a = [
+            Direction::Up,
+            Direction::Right,
+            Direction::Down,
+            Direction::Left,
+        ];
+        let r = rng.gen_range(0..4);
+        a[r]
+    }
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct Position {
     pub x: PositionType,
@@ -132,6 +146,16 @@ impl Position {
     }
 }
 
+impl std::ops::Add for Position {
+    type Output = Position;
+
+    fn add(mut self, rhs: Self) -> Self::Output {
+        self.x += rhs.x;
+        self.y += rhs.y;
+        self
+    }
+}
+
 impl std::ops::Sub for Position {
     type Output = Position;
 
@@ -208,8 +232,8 @@ where
 {
     let stdout = &mut StandardStream::stdout(termcolor::ColorChoice::Always);
 
-    let width_digits = width.ilog10() + 1;
-    let height_digits = height.ilog10() + 1;
+    let width_digits = (width - 1).ilog10() + 1;
+    let height_digits = (height - 1).ilog10() + 1;
 
     // print header
     for i in 0..width_digits {