function getMap(points)
{
	let i_min = Infinity;
	let i_max = 0;
	for (let p of points)
	{
		if (p[0] < i_min)
			i_min = p[0];
		if (p[0] > i_max)
			i_max = p[0];
		if (p[1] < i_min)
			i_min = p[1];
		if (p[1] > i_max)
			i_max = p[1];
	}
	if (i_min < 0 || Math.round(i_min) != i_min)
		warn("getMap: i_min is supposed to be non-negative integer but is " + uneval(i_min));
	if (Math.round(i_max) != i_max)
	{
		warn("getMap: i_max is supposed to be integer but is " + uneval(i_max));
		i_max = Math.round(i_max);
	}
	
	let m = new Array(i_max).fill(0).map(() => new Uint8Array(i_max));
	for (let p of points)
		m[p[0]][p[1]] = 1;
}

function getContinuousAreaFromTiles(startTile, allowed_tiles)
{
	if (allowed_tiles.indexOf(startTile) == -1)
		return [];
	if (allowed_tiles.len() == 1)
		return [startTile];
	
	let tilesToCheck = [startTile];
	let connectedTiles = [];
	while (tilesToCheck)
	{
		let currentTile = tilesToCheck.shift();
		let index = allowed_tiles.indexOf(currentTile); // This may be a performance issue
		if (index != -1)
		{
			connectedTiles.push(currentTile);
			tilesToCheck.push([currentTile[0] + 1, currentTile[1]]);
			tilesToCheck.push([currentTile[0], currentTile[1] + 1]);
			tilesToCheck.push([currentTile[0] - 1, currentTile[1]]);
			tilesToCheck.push([currentTile[0], currentTile[1] - 1]);
			allowed_tiles.splice(index, 1);
		}
	}
	
	return connectedTiles;
}