JavaFX animation - creating animations in JavaFX

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I have a InvocationTargetException (and others) that I can't need to get rid off

I'm making a game where "points" (buttons really) pop up on a screen and you have to push the blue circles to get points. The pentagons are suppose to take away points. I've got the program to generate the points, but I can't implement the lives system. You get a certain amount of lives depending on the difficulty and clicking a pentagon is suppose to take away lives.
Now, every time I try to keep count of how many lives the player has, it spits the InvocationTargetException (and some others but I'm working on one thing at a time).
I got it to put points on the board and randomize their positions every 2 seconds, I'm going to add the score count after I implement the heart count.
Here's my code (I've gone ahead an labeled all buttons so you don't need the images. My GUI is atrocious anyway):


I was asked to provide the stack trace so here it is:
compile-single: run-single: Exception in Application start method java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389) at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) Caused by: java.lang.RuntimeException: Exception in Application start method at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException at lab8.Game.start(Game.java:82) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863) at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326) at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) ... 1 more Exception running application lab8.Game C:\Users\disbitch4real\Documents\NetBeansProjects\Lab8\nbproject\build-impl.xml:1052: The following error occurred while executing this line: C:\Users\disbitch4real\Documents\NetBeansProjects\Lab8\nbproject\build-impl.xml:806: Java returned: 1 BUILD FAILED (total time: 1 second) 
I have also changed my code so hearts are in their own class and manage them outside the main file so my code looks like this now:
public class Game extends Application { //Integer count = 0; <- I'll worry about this later Integer seconds; Label label = new Label(); Integer pointTimer = 2; Button bad = new Button(); Button point = new Button(); Pane group = new Pane(); //the object that manages the hearts Hearts lives = new Hearts(); @Override public void start(Stage primaryStage){ //set up board group.setPrefSize(500, 500); group.setStyle("-fx-background-color: white;"); //holds the main menu BorderPane mainMenu = new BorderPane(); //instructions BorderPane instruct = new BorderPane(); //select difficulty BorderPane play = new BorderPane(); //the game board BorderPane game = new BorderPane(); //when you win BorderPane win = new BorderPane(); //when you lose BorderPane lose = new BorderPane(); //a ready screen before you start so you can // begin when you feel like it BorderPane ready = new BorderPane(); //again button Button again = new Button("again"); //again.setGraphic(new ImageView(new Image("img/again.png"))); //back button Button back = new Button("back"); //back.setGraphic(new ImageView(new Image("img/back.png"))); //easy level button Button easy = new Button("Easy"); //easy.setGraphic(new ImageView(new Image("img/easy.png"))); //hard level button Button hard = new Button("Hard"); //hard.setGraphic(new ImageView(new Image("img/hard.png"))); //Instructions Button inst = new Button("Instructions"); //inst.setGraphic(new ImageView(new Image("img/instructions.png"))); //medium level button Button medium = new Button("Medium"); //medium.setGraphic(new ImageView(new Image("img/medium.png"))); //start button Button start = new Button("Start"); //start.setGraphic(new ImageView(new Image("img/play.png"))); //additional start Button start1 = new Button("Start"); //start1.setGraphic(new ImageView(new Image("img/play.png"))); //graphic for button that removes lives //bad.setGraphic(new ImageView(new Image("img/bad.png"))); //graphic for button that gives points //point.setGraphic(new ImageView(new Image("img/point.png"))); //heart graphic //ImageView heart = new ImageView(); //heart.setImage(new Image("img/heart.png")); //losing graphic //ImageView loser = new ImageView(); //loser.setImage(new Image("img/lose.png")); //Title //ImageView title = new ImageView(); //title.setImage(new Image("img/title.png")); //winning graphic //ImageView winner = new ImageView(); //winner.setImage(new Image("img/win.png")); //variable that holds the lives for the label int displayLives = lives.getHearts(); //diplays the hearts Label label1 = new Label(String.valueOf(displayLives)); //Title Screen mainMenu.setTop(title); mainMenu.setCenter(start); mainMenu.setBottom(inst); //the intructions Text direct = new Text("Click the blue circles to collect points before time runs out!\n" + "Don't click on the pentagons, or you'll lose hearts.\n" + "If you run out of hearts, you lose the game.\n" + "After you select a difficulty, hit the ''Play'' button when you are ready to start\n" + "Note: When you press ''Play'' the game will start immediately, so only \n" + "press when you are ready"); //instructions menu instruct.setTop(new ImageView("img/instructions.png")); instruct.setCenter(direct); instruct.setBottom(back); //difficulty settings play.setTop(title); play.setLeft(easy); play.setCenter(medium); play.setRight(hard); //scoreboard Text score = new Text("Score: "); Text time1 = new Text("Time: "); Text sec = new Text("sec"); Text num = new Text(Integer.toString(count)); //Gridpanes to hold the clock and score GridPane clock = new GridPane(); GridPane scoreboard = new GridPane(); //Timer clock.add(time1, 0,0); clock.add(label, 1, 0); clock.add(sec, 2, 0); //winnner screen win.setTop(title); win.setCenter(winner); win.setCenter(score); win.setCenter(num); win.setBottom(again); //loser screen lose.setTop(title); lose.setCenter(loser); lose.setCenter(score); lose.setCenter(num); lose.setBottom(again); //the main game board game.setRight(scoreboard); game.setLeft(heart); game.setLeft(label1); game.setTop(clock); game.setCenter(group); //ready screen ready.setTop(title); ready.setCenter(start1); //setting up the scenes Scene gameMenu = new Scene(mainMenu); Scene directions = new Scene(instruct); Scene difficulty = new Scene(play); Scene getReady = new Scene(ready); Scene gameStage = new Scene(game); Scene loseGame = new Scene(lose); Scene winGame = new Scene(win); //button actions //instructions inst.setOnAction(e -> { primaryStage.setScene(directions); }); //back to the main title screen back.setOnAction(e -> { primaryStage.setScene(gameMenu); }); //title screen start start.setOnAction(e -> { primaryStage.setScene(difficulty); }); //easy difficulty easy.setOnAction(e -> { //I made methods that handle the settings to avoid errors setDifficultyEasy(); primaryStage.setScene(getReady); }); //medium difficulty medium.setOnAction(e -> { setDifficultyMedium(); primaryStage.setScene(getReady); }); //hard difficulty hard.setOnAction(e -> { setDifficultyHard(); primaryStage.setScene(getReady); }); //start button on ready screen start1.setOnAction(e -> { //changes to game board primaryStage.setScene(gameStage); //starts game gameStart(); //if clock runs out you win if (seconds<=0){ primaryStage.setScene(winGame); } //hearts run out you lose else if (lives.getHearts()<=0){ primaryStage.setScene(loseGame); } }); //resets variables after game that aren't set in the difficulty settings again.setOnAction(e -> { group.getChildren().clear(); count = 0; primaryStage.setScene(difficulty); }); //good points point.setOnAction(e -> { //count++; group.getChildren().clear(); addPoint(); }); //bad points bad.setOnAction(e -> { lives.setHearts(lives.getHearts()-1); group.getChildren().clear(); addPoint(); }); //sets up scenes primaryStage.setScene(gameMenu); primaryStage.setHeight(750); primaryStage.setWidth(750); primaryStage.show(); } //timer private void timerStart(){ Timeline time = new Timeline(); time.setCycleCount(Timeline.INDEFINITE); if (time!=null){ time.stop(); } KeyFrame frame = new KeyFrame(Duration.seconds(1), new EventHandler(){ @Override public void handle(ActionEvent event) { seconds--; label.setText(seconds.toString()); if(seconds<=0){ time.stop(); } if(lives.getHearts()<=0){ time.stop(); } } }); time.getKeyFrames().add(frame); time.playFromStart(); } //point timer private void pointClock(){ Timeline time1 = new Timeline(); time1.setCycleCount(Timeline.INDEFINITE); if (time1!=null){ time1.stop(); } if (lives.getHearts()<=0){ time1.stop(); } KeyFrame frame1 = new KeyFrame(Duration.seconds(1), new EventHandler(){ @Override public void handle(ActionEvent event) { pointTimer--; if(seconds<=0){ time1.stop(); } if(pointTimer<=0){ time1.stop(); group.getChildren().clear(); addPoint(); } if(lives.getHearts()<=0){ time1.stop(); } } }); time1.getKeyFrames().add(frame1); time1.playFromStart(); } public void gameStart(){ timerStart(); addPoint(); } //adds points to the board public void addPoint() { int x; int y; try { x = (int)(Math.random() * 499) + 1; y = (int)(Math.random() * 499) + 1; point.relocate(x, y); group.getChildren().add(point); x = (int)(Math.random() * 499) + 1; y = (int)(Math.random() * 499) + 1; bad.relocate(x, y); group.getChildren().add(bad); pointClock(); //if an error occurs it clears the board and adds a new point } catch (IllegalArgumentException e) { group.getChildren().clear(); addPoint(); } } //methods that set the difficulty public void setDifficultyEasy(){ //sets the lives lives.setHearts(3); //sets the time limit seconds = 30; } public void setDifficultyMedium(){ lives.setHearts(2); seconds = 20; } public void setDifficultyHard(){ lives.setHearts(1); seconds = 10; } public static void main(String[] args) { launch(args); } } 

EDIT 2: I managed to get rid the of the exception. I'm onto other glitches in the game, but I'll make a new post for that.
submitted by disbitch4real to javahelp

Trying to figure out what goes in my EventHandler to make the ball bounce

I'm currently working on this assignment: Create a JavaFX Application named Bounce. In this Application you will use the Ball.java class to draw a red ball in the middle of a 500x500 window. The ball's radius must be 20 pixels. Every 25 milliseconds move the ball by 10 pixels horizontally and 5 pixels vertically. Initially move it 10 pixels horizontally to the right, but as soon as your ball touches the right edge of the window, change its direction to go 10 pixels to the left. Then when it hits the left side, change it back to the right, and so on through an infinite loop. Also, initially move your ball 5 pixels vertically down, but after your ball touches the bottom edge of the window, change its direction to go 5 pixels up instead of down, until it hits the top, and then change its direction again, and so on through the same infinite loop that controls the horizontal direction. Furthermore, whenever your Ball hits any side, change its color to a random set of RGB values that are from 0.3 to 0.7 in the JavaFX Color class.
Here is my Ball.java class:
import javafx.scene.paint.Color; import javafx.scene.shape.Circle; import javafx.scene.layout.Pane; /** * The Ball Class * Implements a ball object that has a position point, a speed * vector, a radius, and a color */ public class Ball { private double xSpeed, ySpeed; // The x and y speed private Circle circle; // The circle object private Color color; // The circle color private Pane pane; // The drawing pane /** * The one-arg constructor sets the position and the x and y * speed to (0,0), the radius to 0 and the color to black * @param pane is the ball's drawing pane */ public Ball(Pane pane) { this(0,0,0,0,0,0,0,0,pane); } /** * The nine-arg constructor sets all the field values * @param x is the ball's initial x position * @param y is the ball's initial y position * @param xSpeed is the ball's initial x vector component * @param ySpeed is the ball's initial y vector component * @param r is the ball's initial radius * @param rCol is the ball's initial color's r component * @param gCol is the ball's initial color's g component * @param bCol is the ball's initial color's b component * @param pane is the ball's drawing pane */ public Ball(double x, double y, double xSpeed, double ySpeed, double r, double rCol, double gCol, double bCol, Pane pane) { this.pane = pane; this.circle = new Circle(x, y, r); this.pane.getChildren().add(this.circle); setSpeed(xSpeed,ySpeed); setColor(rCol,gCol,bCol); } /** * The getter for the X coordinate * * @return Returns the X coordinate */ public double getX() { return(this.circle.getCenterX()); } /** * The getter for the Y coordinate * * @return Returns the Y coordinate */ public double getY() { return(this.circle.getCenterY()); } /** * The setter for the X coordinate * * @param xPos is the new X coordinate */ public void setX(double xPos) { this.circle.setCenterX(xPos); } /** * The setter for the Y coordinate * * @param yPos is the new Y coordinate */ public void setY(double yPos) { this.circle.setCenterY(yPos); } /** * The getter for the X vector component * * @return Returns the X vector component */ public double getXSpeed() { return(this.xSpeed); } /** * The getter for the Y vector component * * @return Returns the Y vector component */ public double getYSpeed() { return(this.ySpeed); } /** * The setter for the X vector component * * @param speed is the new X vector component */ public void setXSpeed(double speed) { this.xSpeed = speed; } /** * The setter for the Y vector component * * @param speed is the new Y vector component */ public void setYSpeed(double speed) { this.ySpeed = speed; } /** * Sets the X and Y positions * * @param xPos is the new X coordinate * @param yPos is the new Y coordinate */ public void setPosition(double xPos, double yPos) { setX(xPos); setY(yPos); } /** * Moves the ball by the X and Y movement vectors */ public void move() { move(this.xSpeed,this.ySpeed); } /** * Moves the ball by the xOff and yOff movement vectors * * @param xSpeed is the offset for the X coordinate * @param ySpeed is the offset for the Y coordinate */ public void move(double xSpeed, double ySpeed) { setX(getX() + xSpeed); setY(getY() + ySpeed); } /** * Sets the X and Y movement vector components * * @param xSpeed is the new X vector components * @param ySpeed is the new Y vector components */ public void setSpeed(double xSpeed, double ySpeed) { setXSpeed(xSpeed); setYSpeed(ySpeed); } /** * The getter for the radius * * @return Returns the radius */ public double getRadius() { return(this.circle.getRadius()); } /** * The setter for the radius * * @param radius is the new radius */ public void setRadius(double radius) { this.circle.setRadius(radius); } /** * The getter for the color * * @return Returns the color */ public Color getColor() { return(this.color); } /** * The setter for the color * * @param color is the new color */ public void setColor(Color color) { this.color = color; this.circle.setFill(this.color); } /** * The setter for the color using integer color components * * @param rCol is the new color's Red component * @param gCol is the new color's Green component * @param bCol is the new color's Blue component */ public void setColor(double rCol, double gCol, double bCol) { setColor(new Color(rCol,gCol,bCol,1d)); } /** * Gets the distance to integer X and Y coordinates * * @param xPos is X coordinate as an integer * @param yPos is Y coordinate as an integer * @return Returns the distance to the X and Y coordinate */ public double distance(double xPos, double yPos) { return (Math.sqrt(Math.pow(xPos-this.circle.getCenterX(),2) + Math.pow(yPos-this.circle.getCenterY(),2))); } /** * Gets the distance to given Ball * * @param anotherBall is the given Ball * @return the distance to given Ball */ public double distance(Ball anotherBall) { return (distance(anotherBall.getX(),anotherBall.getY())); } /** * The toString method for the Ball class * * @return Returns the Ball's position, it's movement vector, * it's radius and it's color */ public String toString() { return("Ball Position: (" + this.getX() + "," + this.getY() + ")\n" + "Ball Speed Vector: (" + this.getXSpeed() + "," + this.getYSpeed() + ")\n" + "Ball Radius: " + this.circle.getRadius() + "\n" + "Ball Color: (" + this.color.getRed() + "," + this.color.getGreen() + "," + this.color.getBlue() + ")"); } } 
And my AnimatedBall.java class:
import javafx.animation.KeyFrame; import javafx.animation.Timeline; import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Scene; import javafx.stage.Stage; import javafx.scene.layout.Pane; import javafx.util.Duration; import javafx.scene.paint.Color; public class AnimatedBall extends Application { public static void main(String[] args){ launch(args); } public void start(Stage primaryStage) { Pane pane = new Pane(); Ball ball = new Ball(250, 250, 10, 5, 20, 0.3, 0.5, 0.7, pane); ball.setColor(Color.RED); EventHandler eventHandler = e -> { ball.move(); }; Timeline animation = new Timeline( new KeyFrame(Duration.millis(25), eventHandler)); animation.setCycleCount(Timeline.INDEFINITE); animation.play(); // Start animation //Creates a scene Scene scene = new Scene(pane, 500, 500); primaryStage.setTitle("Bounce"); // Set the stage title primaryStage.setScene(scene); // Place the scene in the stage primaryStage.show(); // Display the stage } } 
I'm struggling figuring out what goes in my EventHandler to make the ball bounce and when it bounces for it to change color.
submitted by Mangos420 to java_class