1 files changed, 18 insertions, 0 deletions
diff --git a/tris/move.go b/tris/move.go
new file mode 100644
index 0000000..0e081ef
--- /dev/null
+++ b/tris/move.go
@@ -0,0 +1,18 @@
+package tris
+
+func (p Placement) Move(f Field, rot Rotation, x, y int) (np Placement, floor, topout bool) {
+	np = p
+	np.Rot = rot
+	np.X = x
+	np.Y = y
+	if !np.Collide(f) { // free air
+		return np, false, false
+	}
+	np = p // last resort reset p
+	fp := np
+	fp.Y++
+	if fp.Collide(f) && np.Y < 0 {
+		return np, true, true
+	}
+	return np, fp.Collide(f), false
+}