1 files changed, 57 insertions, 0 deletions
diff --git a/tris/core.go b/tris/core.go
new file mode 100644
index 0000000..41d1beb
--- /dev/null
+++ b/tris/core.go
@@ -0,0 +1,57 @@
+package tris
+
+type PieceType int
+
+const (
+	IPiece PieceType = iota
+	JPiece
+	LPiece
+	SPiece
+	ZPiece
+	TPiece
+	OPiece
+)
+
+type Point struct {
+	X, Y int
+}
+
+type Piece struct {
+	Type   PieceType
+	RelX   int
+	RelY   int
+	Layout []Point
+	Lock   int
+}
+
+type Bag []Piece
+
+type Field [20][10]bool
+
+func (f Field) String() (output string) {
+	var toprow [10]bool
+	var top bool
+	for _, row := range f {
+		top = !top
+		for i, block := range row {
+			if top {
+				toprow[i] = block
+				continue
+			}
+			switch {
+			case toprow[i] && block:
+				output += "\u2588"
+			case toprow[i] && !block:
+				output += "\u2580"
+			case !toprow[i] && block:
+				output += "\u2584"
+			default:
+				output += " "
+			}
+		}
+		if !top {
+			output += "\n"
+		}
+	}
+	return output
+}