added mirror function to structure

src/lib/turtle/Structure.hx

@@ -14,6 +14,14 @@ abstract Structure(Array<Layer>) from Array<Layer> {
 	public function rotate():Structure {
 		return [for (i in 0...height()) this[i].rotate()];
 	}
+
+	public function mirrorX():Structure {
+		return [for (i in 0...height()) this[i].mirrorX()];
+	}
+
+	public function mirrorY():Structure {
+		return [for (i in 0...height()) this[i].mirrorY()];
+	}
 }
 
 abstract Layer(Array<Array<Block>>) from Array<Array<Block>> {
@@ -65,4 +73,28 @@ abstract Layer(Array<Array<Block>>) from Array<Array<Block>> {
 
 		return rotatedMatrix;
 	}
+
+	public function mirrorX():Layer {
+		var rtn = [];
+
+		for (y in 0...height()) {
+			var rev = this[y].copy();
+			rev.reverse();
+			rtn.push(rev);
+		}
+
+		return rtn;
+	}
+
+	public function mirrorY():Layer {
+		var rtn = [for (_ in 0...height()) []];
+
+		for (y in 0...height()) {
+			for (x in 0...width()) {
+				rtn[height() - 1 - y][x] = get(x, y);
+			}
+		}
+
+		return rtn;
+	}
 }