Langton's ant: Difference between revisions

<lang d>void main() @safe {

import std.stdio, std.traits;

enum width = 75, height = 52;

enum maxSteps = 12_000;

enum Direction { up, right, down, left }

enum Color : char { white = '.', black = '#' }

uint x = width / 2, y = height / 2;

auto M = new Color[][](height, width);

auto dir = Direction.up;

with (Color)

for (int i = 0; i < maxSteps && x < width && y < height; i++) {

immutable turn = M[y][x] == black;

dir = [EnumMembers!Direction][(dir + (turn ? 1 : -1)) & 3];

M[y][x] = (M[y][x] == black) ? white : black;

final switch(dir) with (Direction) {

case up: y--; break;

case right: x--; break;

case down: y++; break;

case left: x++; break;

}

}

writefln("%(%-(%c%)\n%)", M);