add TestBlockGame

Author: bjornregnell

src/main/scala/introprog/examples/TestBlockGame.scala

@@ -0,0 +1,70 @@
+package introprog.examples
+
+/** Example of a simple BlockGame app with overridden callbacks to handle events
+  * See the documentation of BlockGame and the source code of TestBlockGame
+  * for inspiration on how to inherit BlockGame to create your own block game.
+  */
+object TestBlockGame {
+  /** Create Game and start playing. */
+  def main(args: Array[String]): Unit = (new RandomBlocks).play()
+
+  /** A class extending `introprog.BlockGame`, see source code. */
+  class RandomBlocks extends introprog.BlockGame {
+
+    sealed trait State
+    case object Starting extends State
+    case object Playing  extends State
+    case object GameOver extends State
+
+    var state: State = Starting
+    var isDrawingRandomBlocks: Boolean = false
+
+    def showEnterMessage(): Unit =
+      drawTextInMessageArea("Press Enter to toggle random blocks.", 0,0)
+
+    def showEscapeMessage(): Unit =
+      drawTextInMessageArea("Press Escape to clear window.", 25, 0)
+
+    override def onKeyDown(key: String): Unit = {
+      print(s" Key down: $key")
+      key match {
+        case "Escape" =>
+          clearWindow()
+          drawCenteredText("ESCAPED TO BLACK SPACE!")
+          showEnterMessage()
+        case "Enter"  =>
+          isDrawingRandomBlocks = !isDrawingRandomBlocks
+          showEscapeMessage()
+        case _ =>
+      }
+    }
+
+    override def onKeyUp(key: String): Unit = print(s" Key up: $key")
+
+    override def onMouseDown(pos: (Int, Int)): Unit = print(s" Mouse down: $pos")
+
+    override def onMouseUp(pos: (Int, Int)): Unit = print(s" Mouse up: $pos")
+
+    override def onClose(): Unit = {
+      print(" Window Closed.")
+      state = GameOver
+    }
+    override def gameLoopAction(): Unit = {
+      import scala.util.Random.nextInt
+      def rndPos: (Int, Int) = (nextInt(dim._1), nextInt(dim._2))
+      def rndColor = new java.awt.Color(nextInt(256), nextInt(256), nextInt(256))
+      print(".")
+      if (isDrawingRandomBlocks) {
+        drawBlock(rndPos._1, rndPos._2, rndColor)
+      }
+    }
+
+    def play(): Unit = {
+      state = Playing
+      println(s"framesPerSecond == $framesPerSecond")
+      showEnterMessage()
+      gameLoop(stopWhen = state == GameOver)
+      println("Goodbye!")
+    }
+  }
+}