import javafx.application.Application;
import javafx.scene.canvas.Canvas;
import javafx.scene.Scene;
import javafx.scene.Group;
import javafx.stage.Stage;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.shape.ArcType;
import javafx.scene.paint.Color;

public class YellowFace extends Application
{
   public static final int WINDOW_WIDTH = 400;
   public static final int WINDOW_HEIGHT = 300;

   public static final int FACE_DIAMETER = 200;
   public static final int X_FACE = 100;
   public static final int Y_FACE = 50;

   public static final int EYE_WIDTH = 10;
   public static final int EYE_HEIGHT = 20;
   public static final int X_RIGHT_EYE = 155;
   public static final int Y_RIGHT_EYE = 100;
   public static final int X_LEFT_EYE = 230;
   public static final int Y_LEFT_EYE = Y_RIGHT_EYE;

   public static final int NOSE_DIAMETER = 10;
   public static final int X_NOSE = 195; // Center of nose at 200
   public static final int Y_NOSE = 135;

   public static final int MOUTH_WIDTH = 100;
   public static final int MOUTH_HEIGHT = 50;
   public static final int X_MOUTH = 150;
   public static final int Y_MOUTH = 160;
   public static final int MOUTH_START_ANGLE = 180;
   public static final int MOUTH_DEGREES_SHOWN = 180;

   public static void main(String[] args)
   {
      launch(args);
   }

   @Override
   public void start(Stage primaryStage) throws Exception
   {
    Group root = new Group();
   	Scene scene = new Scene(root);

    Canvas canvas = new Canvas(WINDOW_WIDTH, WINDOW_HEIGHT);
    GraphicsContext gc = canvas.getGraphicsContext2D();
    // Draw face interior in yellow and outline in black
    gc.setFill(Color.YELLOW);
    gc.fillOval(X_FACE, Y_FACE, FACE_DIAMETER, FACE_DIAMETER);
    gc.setFill(Color.BLACK);
    gc.strokeOval(X_FACE, Y_FACE, FACE_DIAMETER, FACE_DIAMETER);
    // Draw eyes
    gc.setFill(Color.BLUE);
	gc.fillOval(X_RIGHT_EYE, Y_RIGHT_EYE, EYE_WIDTH, EYE_HEIGHT);
	gc.fillOval(X_LEFT_EYE, Y_LEFT_EYE, EYE_WIDTH, EYE_HEIGHT);
	// Draw nose
	gc.setFill(Color.BLACK);
	gc.fillOval(X_NOSE, Y_NOSE, NOSE_DIAMETER, NOSE_DIAMETER);

	// Draw mouth
	gc.setFill(Color.RED);
	gc.strokeArc(X_MOUTH, Y_MOUTH, MOUTH_WIDTH, MOUTH_HEIGHT,
	             MOUTH_START_ANGLE, MOUTH_DEGREES_SHOWN, ArcType.OPEN);

    root.getChildren().add(canvas);
    primaryStage.setTitle("HappyFace in JavaFX");
    primaryStage.setScene(scene);
    primaryStage.show();
   }
}