1 files changed, 13 insertions, 0 deletions
diff --git a/tris/next.go b/tris/next.go
new file mode 100644
index 0000000..e72a4ff
--- /dev/null
+++ b/tris/next.go
@@ -0,0 +1,13 @@
+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
+}