added drawCircle

src/logo/TestLogo.scala

@@ -2,9 +2,23 @@ package logo
 
 import hevs.graphics.TurtleGraphics
 
+import java.awt.Color
+
 object TestLogo {
+  def drawCircle(turtle: TurtleGraphics, radius: Double, resolution: Int = 24): Unit = {
+    val angle: Double = 360.0 / resolution
+    val side: Double = radius * math.sin(angle * math.Pi / 180)
+    turtle.forward(-side / 2)
+    for (_: Int <- 0 until resolution) {
+      turtle.forward(side)
+      turtle.turn(angle)
+    }
+  }
+
   def main(args: Array[String]): Unit = {
     val turtle: TurtleGraphics = new TurtleGraphics(600, 600)
+    turtle.drawLine(150, 300, 450, 300)
+
     turtle.penUp()
     turtle.jump(300, 300)
     turtle.setAngle(0)
@@ -15,5 +29,10 @@ object TestLogo {
       turtle.forward(300)
       turtle.turn(120)
     }
+
+    turtle.jump(450, 300)
+    turtle.setAngle(90)
+    turtle.setColor(Color.RED)
+    drawCircle(turtle, 150)
   }
 }