chapter 1 done

Author: mdodsworth

.gitignore

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+*.class
+.*.un~

shapes-actor-script.scala

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+import shapes._
+
+ShapeDrawer.start()
+
+ShapeDrawer ! new Square(0.0, 1.0)
+ShapeDrawer ! 3.14
+ShapeDrawer ! "exit"
+

shapes-actor.scala

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+package shapes
+
+import scala.actors._
+import scala.actors.Actor._
+
+object ShapeDrawer extends Actor {
+    def act() {
+        loop {
+            receive {
+                case s:Shape => s.draw
+                case "exit" => println("exiting..."); exit
+                case x:Any => println("Error: Unknown type")
+            }
+        }
+    }
+}

shapes.scala

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+package shapes
+
+class Point(val x:Double, val y:Double) {
+    override def toString = "Point(" + x + ", " + y + ")"
+}
+
+abstract class Shape {
+    def draw() :Unit
+}
+
+class Square(val height:Double, val width:Double) extends Shape {
+    override def draw() = println("drawing a square(" + height + ", " + width + ")")
+}