1 files changed, 23 insertions, 0 deletions
diff --git a/tris/hold.go b/tris/hold.go
new file mode 100644
index 0000000..6a82f5b
--- /dev/null
+++ b/tris/hold.go
@@ -0,0 +1,23 @@
+package tris
+
+var HoldPiece Piece
+
+var HoldBox Field
+
+var Swapped bool
+
+func (b Bag) Swap(p Placement) (Bag, Placement) {
+	if Swapped {
+		return b, p
+	}
+	var tempp Placement
+	if HoldPiece == EmptyPiece {
+		b, tempp = b.Pick()
+		HoldPiece = tempp.piece
+	}
+	p.piece, HoldPiece = HoldPiece, p.piece
+	Swapped = true
+	HoldBox, _ = Placement{piece: HoldPiece, X: 0, Y:0}.Field(2,4)
+	p.Rot, p.X, p.Y = 0, 3, -2
+	return b, p
+}