tris/next.go


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package tris

func (b Bag) Next(n int) (Bag, Field) {
	var f Field
	for len(b) < n {
		b = append(b, NewBag()...)
	}
	nextpieces := b[:n]
	for i, p := range nextpieces {
		f = f.Add(Placement{piece: p, Y:2+i*4})
	}
	return b, f
}