added Snowflake

src/logo/Snowflake.scala

@@ -0,0 +1,47 @@
+package logo
+
+import hevs.graphics.TurtleGraphics
+
+import java.awt.Point
+
+class Snowflake(width: Int, height: Int) extends TurtleGraphics(width, height) {
+  def drawFlakeSegment(n: Int, length: Double): Unit = {
+    if (n == 1) {
+      forward(length)
+      return
+    }
+
+    val third: Double = length / 3
+    drawFlakeSegment(n - 1, third)
+    turn(-60)
+    drawFlakeSegment(n - 1, third)
+    turn(120)
+    drawFlakeSegment(n - 1, third)
+    turn(-60)
+    drawFlakeSegment(n - 1, third)
+  }
+
+  def drawFlake(n: Int, length: Double): Unit = {
+    val pos: Point = getPosition()
+    val x: Double = pos.x - length / 2
+    val y: Double = pos.y - math.sqrt(3) * length / 6
+    jump(x.toInt, y.toInt)
+    setAngle(0)
+    drawFlakeSegment(n, length)
+    turn(120)
+    drawFlakeSegment(n, length)
+    turn(120)
+    drawFlakeSegment(n, length)
+    turn(120)
+  }
+}
+
+object Snowflake {
+  def main(args: Array[String]): Unit = {
+    val win = new Snowflake(600, 600)
+    win.penUp()
+    win.jump(300, 300)
+    win.penDown()
+    win.drawFlake(5, 400)
+  }
+}