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import scala.swing._
import scala.swing.BorderPanel.Position._
import event._
import java.awt.{ Color, Graphics2D }
import scala.util.Random
 
object SimpleGUI extends SimpleSwingApplication {
 
  def top = new MainFrame { // top is a required method
    title = "A Sample Scala Swing GUI"
 
    // declare Components here
    val label = new Label {
      text = "I'm a big label!."
      font = new Font("Ariel", java.awt.Font.ITALIC, 24)
    }
    val button = new Button {
      text = "Throw!"
      foreground = Color.blue
      background = Color.red
      borderPainted = true
      enabled = true
      tooltip = "Click to throw a dart"
    }
    val toggle = new ToggleButton { text = "Toggle" }
    val checkBox = new CheckBox { text = "Check me" }
    val textField = new TextField {
      columns = 10
      text = "Click on the target!"
    }
    val textArea = new TextArea {
      text = "initial text\nline two"
      background = Color.green
    }
    val canvas = new Canvas {
      preferredSize = new Dimension(100, 100)
    }
    val gridPanel = new GridPanel(1, 2) {
      contents += checkBox
      contents += label
      contents += textArea
    }
 
    // choose a top-level Panel and put components in it
    // Components may include other Panels
    contents = new BorderPanel {
      layout(gridPanel) = North
      layout(button) = West
      layout(canvas) = Center
      layout(toggle) = East
      layout(textField) = South
    }
    size = new Dimension(300, 200)
    menuBar = new MenuBar {
      contents += new Menu("File") {
        contents += new MenuItem(Action("Exit") {
          sys.exit(0)
        })
      }
    }
 
    // specify which Components produce events of interest
    listenTo(button)
    listenTo(toggle)
    listenTo(canvas.mouse.clicks)
 
    // react to events
    reactions += {
      case ButtonClicked(component) if component == button =>
        val x = Random.nextInt(100)
        val y = Random.nextInt(100)
        val c = new Color(Random.nextInt(Int.MaxValue))
        canvas.throwDart(new Dart(x, y, c))
        textField.text = s"Dart thrown at $x, $y"
      case ButtonClicked(component) if component == toggle =>
        toggle.text = if (toggle.selected) "On" else "Off"
      case MouseClicked(_, point, _, _, _) =>
        canvas.throwDart(new Dart(point.x, point.y, Color.black))
        textField.text = (s"You clicked in the Canvas at x=${point.x}, y=${point.y}.") 
    }
  }
}

Main.scala:35: error: not found: type Canvas
    val canvas = new Canvas {
                     ^
Main.scala:49: error: type mismatch;
 found   : AnyRef
 required: scala.swing.Component
      layout(canvas) = Center
             ^
Main.scala:65: error: value mouse is not a member of AnyRef
    listenTo(canvas.mouse.clicks)
                    ^
Main.scala:73: error: value throwDart is not a member of AnyRef
        canvas.throwDart(new Dart(x, y, c))
               ^
Main.scala:73: error: not found: type Dart
        canvas.throwDart(new Dart(x, y, c))
                             ^
Main.scala:78: error: value throwDart is not a member of AnyRef
        canvas.throwDart(new Dart(point.x, point.y, Color.black))
               ^
Main.scala:78: error: not found: type Dart
        canvas.throwDart(new Dart(point.x, point.y, Color.black))
                             ^
7 errors found
Usage: scalac <options> <source files>
where possible standard options include:
  -Dproperty=value                Pass -Dproperty=value directly to the runtime system.
  -J<flag>                        Pass <flag> directly to the runtime system.
  -P:<plugin>:<opt>               Pass an option to a plugin
  -X                              Print a synopsis of advanced options.
  -bootclasspath <path>           Override location of bootstrap class files.
  -classpath <path>               Specify where to find user class files.
  -d <directory|jar>              destination for generated classfiles.
  -dependencyfile <file>          Set dependency tracking file.
  -deprecation                    Emit warning and location for usages of deprecated APIs.
  -encoding <encoding>            Specify character encoding used by source files.
  -explaintypes                   Explain type errors in more detail.
  -extdirs <path>                 Override location of installed extensions.
  -feature                        Emit warning and location for usages of features that should be imported explicitly.
  -g:<level>                      Set level of generated debugging info. (none,source,line,vars,notailcalls) default:vars
  -help                           Print a synopsis of standard options
  -javabootclasspath <path>       Override java boot classpath.
  -javaextdirs <path>             Override java extdirs classpath.
  -language:<_,feature,-feature>  Enable or disable language features: `_' for all, `-language:help' to list
  -no-specialization              Ignore @specialize annotations.
  -nobootcp                       Do not use the boot classpath for the scala jars.
  -nowarn                         Generate no warnings.
  -optimise                       Generates faster bytecode by applying optimisations to the program
  -print                          Print program with Scala-specific features removed.
  -sourcepath <path>              Specify location(s) of source files.
  -target:<target>                Target platform for object files. All JVM 1.5 targets are deprecated. (jvm-1.5,jvm-1.6,jvm-1.7,jvm-1.8) default:jvm-1.6
  -toolcp <path>                  Add to the runner classpath.
  -unchecked                      Enable additional warnings where generated code depends on assumptions.
  -uniqid                         Uniquely tag all identifiers in debugging output.
  -usejavacp                      Utilize the java.class.path in classpath resolution.
  -usemanifestcp                  Utilize the manifest in classpath resolution.
  -verbose                        Output messages about what the compiler is doing.
  -version                        Print product version and exit.
  @<file>                         A text file containing compiler arguments (options and source files)

spoj: The program compiled successfully, but Main.class was not found.
      Class Main should contain method: def main(args: Array[String]).

Standard output is empty