Data commit

Task/Langtons-ant/Rust/langtons-ant.rust

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+struct Ant {
+    x: usize,
+    y: usize,
+    dir: Direction
+}
+
+#[derive(Clone,Copy)]
+enum Direction {
+    North,
+    East,
+    South,
+    West
+}
+
+use Direction::*;
+
+impl Ant {
+    fn mv(&mut self, vec: &mut Vec<Vec<u8>>) {
+        let pointer = &mut vec[self.y][self.x];
+        //change direction
+        match *pointer {
+            0 => self.dir = self.dir.right(),
+            1 => self.dir = self.dir.left(),
+            _ => panic!("Unexpected colour in grid")
+        }
+        //flip colour
+        //if it's 1 it's black
+        //if it's 0 it's white
+        *pointer ^= 1;
+
+        //move direction
+        match self.dir {
+            North => self.y -= 1,
+            South => self.y += 1,
+            East => self.x += 1,
+            West => self.x -= 1,
+        }
+
+    }
+}
+
+impl Direction {
+    fn right(self) -> Direction {
+        match self {
+            North => East,
+            East => South,
+            South => West,
+            West => North,
+        }
+    }
+
+    fn left(self) -> Direction {
+        //3 rights equal a left
+        self.right().right().right()
+    }
+}
+
+fn main(){
+    //create a 100x100 grid using vectors
+    let mut grid: Vec<Vec<u8>> = vec![vec![0; 100]; 100];
+    let mut ant = Ant {
+        x: 50, y: 50, dir: Direction::North
+    };
+
+    while ant.x < 100 && ant.y < 100 {
+        ant.mv(&mut grid);
+    }
+    for each in grid.iter() {
+        //construct string
+        //using iterator methods to quickly convert the vector
+        //to a string
+        let string = each.iter()
+                         .map(|&x| if x == 0 { " " } else { "#" })
+                         .fold(String::new(), |x, y| x+y);
+        println!("{}", string);
+    }
+}