Langton's ant: Difference between revisions

=={{header|Wren}}==

{{trans|D}}

The textual version only.

<lang ecmascript>var width = 75

var height = 52

var maxSteps = 12000

var up = 0

var right = 1

var down = 2

var left = 3

var direction = [up, right, down, left]

var white = 0

var black = 1

var x = (width/2).floor

var y = (height/2).floor

var m = List.filled(height, null)

for (i in 0...height) m[i] = List.filled(width, 0)

var dir = up

var i = 0

while (i < maxSteps && 0 <= x && x < width && 0 <= y && y < height) {

var turn = (m[y][x] == black)

var index = (dir + (turn ? 1 : -1)) & 3

dir = direction[index]

m[y][x] = (m[y][x] == black) ? white : black

if (dir == up) {

y = y - 1

} else if (dir == right) {

x = x - 1

} else if (dir == down) {

y = y + 1

} else {

x = x + 1

}

i = i + 1

}

for (j in 0...height) {

for (k in 0...width) System.write((m[j][k] == white) ? "." : "#")

System.print()

}</lang>

{{out}}

<pre>

Same as D entry.

</pre>