Removing all rectangles in rectangle array(LIBGDX) - libgdx

Hi guys so I created a simple game with a flying helicopter in which you need to dodge the missiles. I want to remove all missiles that are created in the screen if gameOver boolean is true. What is happening is it's only removed if the helicopter dies because of hitting the missile, but if it dies by hitting the ground the "game over" message shows but the missiles are not removed!
I tried using
if(heliR.overlaps(missiles)){gameOver=true; Iter.remove; }
But like what I said all missiles are only removed if I died by hitting missile, can anyone help me in this?
Here is my code:
#Override
public void create()
{
batch = new SpriteBatch();
camera=new OrthographicCamera();
camera.setToOrtho(false,800,480);
restart=TimeUtils.nanoTime();
click=TimeUtils.nanoTime();
//fonts
font=new BitmapFont();
font1=new BitmapFont();
font2=new BitmapFont();
font.setColor(Color.RED);
font1.setColor(Color.BLACK);
font2.setColor(Color.WHITE);
font.setScale(3);
font1.setScale(1);
font2.setScale(2);
//score
points=0;
lastScore=TimeUtils.nanoTime();
//background
Texture texture=new Texture(Gdx.files.internal("background.png"));
background=new TextureRegion(texture,0,0,800,480);
//logo
logo=new Texture(Gdx.files.internal("logo.png"));
logoR=new Rectangle();
logoR.x=230;
logoR.y=240;
logoR.width=230;
logoR.height=100;
//helicopter
heli=new Texture(Gdx.files.internal("helicopter.png"));
heliR=new Rectangle();
heliR.x=280;
heliR.y=400;
heliR.width=heli.getWidth()-15;
heliR.height=heli.getHeight()-15;
//Sounds
heliSound=Gdx.audio.newSound(Gdx.files.internal("helicopter.wav"));
heliLanding=Gdx.audio.newSound(Gdx.files.internal("helicopter_landing.wav"));
collision=Gdx.audio.newSound(Gdx.files.internal("collision.wav"));
//missile
missileImg=new Texture(Gdx.files.internal("missile.png"));
missiles=new Array<Rectangle>();
}
public void spawnMissile(){
Rectangle missile=new Rectangle();
missile.y=MathUtils.random(60,400);
missile.x=mX;
missile.width=missileImg.getWidth()-15;
missile.height=missileImg.getHeight()-10;
missiles.add(missile);
lastMissile=TimeUtils.nanoTime();
velocity=250;
}
#Override
public void render()
{
Gdx.gl.glClearColor(1, 1, 1, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
batch.begin();
batch.draw(background,backGroundX-800,0,800,480);
batch.draw(background,backGroundX,0,800,480);
batch.draw(heli,heliR.x,heliR.y);
if(justStart==false && gameOver==false){
font2.draw(batch,"Points:"+points,345,480);}
//missile
for(Rectangle missile: missiles){
batch.draw(missileImg,missile.x,missile.y);
}
//game over
if(gameOver==true){
heliR.y=250;
heliR.x=330;
font.draw(batch,"Game Over",280,400);
font1.draw(batch,"[Long press on the screen to restart]",275,230);
font1.draw(batch,"Your points:"+points,348,250);
if(Gdx.input.isTouched()){
longClick+=1;
if(longClick==35){
gameOver=false;
points=0;
longClick=0;
heliR.y=300;
heliR.x=30;
}
}else{
if(TimeUtils.nanoTime()- click > 2000000){longClick=0;}
}
}
//starting game
if(justStart==true){
heliR.y=250;
heliR.x=330;
font2.draw(batch,"Touch the screen to start",230,230);
batch.draw(logo,logoR.x,logoR.y);
font1.draw(batch,"Developed by:Monzterr",5,15);
if(Gdx.input.isTouched()){
justStart=false;
heliR.y=300;
heliR.x=30;
}
}
batch.end();
//game physics
if(justStart==false&&gameOver==false){
//missile
if(TimeUtils.nanoTime()-lastMissile > 1000000000){spawnMissile();}
Iterator <Rectangle> iter=missiles.iterator();
while(iter.hasNext()){
Rectangle missile= iter.next();
missile.x-=velocity*Gdx.graphics.getDeltaTime();
if(missile.x<=-10){iter.remove();}
if(missile.overlaps(heliR)){
gameOver=true;
collision.play();
}
if(gameOver==true){
iter.remove();
}
}
//background
backGroundX= backGroundX-100*Gdx.graphics.getDeltaTime();
if(backGroundX<=0){
backGroundX=800;
}
//score
if(TimeUtils.nanoTime()-lastScore>2000000000){
points=points+1;
lastScore=TimeUtils.nanoTime();
}
//gravity
if(Gdx.input.isTouched()){
heliR.y+=5;
//heliLanding.play();
}else{
heliR.y-=5;
//heliLanding.pause();
}
}
//borders
if(heliR.y>=400){
heliR.y=250;
}
if(heliR.y<=56){
heliR.y=56;
gameOver=true;
mX=800;
collision.play();
}
}
#Override
public void dispose()
{
}
#Override
public void resize(int width, int height)
{
}
#Override
public void pause()
{
}
#Override
public void resume()
{
}
Sorry for messy code I just started learning programming last week.

You are checking if gameOver == true twice - one on the (almost) beginning of the render() method
//game over
if(gameOver==true){
heliR.y=250;
...
and second time under following condition
//game physics
if(justStart==false&&gameOver==false){
...
but you are removing iterator only in the second one
if(gameOver==true){
iter.remove();
}
fixing it should fix your problem. Consider also do you need two checks if gameOver is true (I believe you not - you can handle both situations in the first one)

You are changing gameOver to true in the middle of looping through all your enemies, and only removing them from within the loop, so only the enemies after the one that caused the game over will be removed. Replace iter.remove() with break (to jump out of the loop which is now unnecessary to finish). And then add a line after the loop:
if (gameOver) missiles.clear();
This removes everything from the array.

Related

Functions not doing anything

I have a gameObject called BounceBack that is supposed to bounce the ball back far away when they collide together.
public class BounceBack : MonoBehaviour
{
public GameObject Player;
public float force;
private void OnCollisionEnter(Collision collision)
{
if (collision.gameObject.CompareTag(Player.tag))
{
Player.GetComponent<PlayerController>().ForceBack(force);
}
}
}
The ball Player (ball) script:
public class PlayerController : MonoBehaviour
{
public int acceleration;
public int speedLimit;
public int sideSpeed;
public Text countText;
public Text winText;
public GameObject pickUp;
public GameObject finishLine;
//internal void ForceBack() //Not sure what it does and why it's there.
//{
// throw new NotImplementedException();
//}
private int count;
private Rigidbody rb;
// Start is called before the first frame update
void Start()
{
rb = GetComponent<Rigidbody>();
SetCount();
}
// Update is called once per frame
void FixedUpdate()
{
float moveHorizontal = Input.GetAxis("Horizontal") * sideSpeed * rb.velocity.magnitude / acceleration;
//float moveVertical = Input.GetAxis("Vertical") * acceleration;
if (rb.velocity.magnitude <= speedLimit)
{
rb.AddForce(0.0f, 0.0f, acceleration); // add vertical force
}
rb.AddForce(moveHorizontal, 0.0f, 0.0f); // add horizontal force
}
private void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag(pickUp.tag))
{
other.GetComponent<Rotate>().Disapear();
count++;
SetCount();
}
if (other.gameObject.CompareTag(finishLine.tag))
{
acceleration = 0;
sideSpeed = 0;
finishLine.GetComponent<GameEnd>().FadeOut();
if (count >= 2)
{
winText.GetComponent<WinTextFadeIn>().FadeIn("Vous avez remporté la partie!");
}
else
{
winText.GetComponent<WinTextFadeIn>().FadeIn("Vous avez perdu. Réesayer?");
}
}
}
private void SetCount()
{
countText.text = "Count : " + count.ToString();
}
public void ForceBack(float force)
{
Rigidbody rb = GetComponent<Rigidbody>();
rb.AddForce(0.0f, 0.0f, -force, ForceMode.VelocityChange);
Debug.Log("Pass");
}
}
The AddForce function does not do anything. I tried with setActive(false) and it's not working either. The only thing that works is Debug.Log(). I'm not sure if the speedlimit and acceleration are interfering with the function.
EDIT: I'm not sure if the problem is from Unity but I can't access any variable of the class from the forceBack function inside the class.
EDIT2: I also tried to call the AddForce function directly in the Bounce Back script but it's not working either.
Player.GetComponent<Rigidbody>().AddForce(0.0f, 0.0f, -force, ForceMode.VelocityChange);
Player (Ball) Screenshot
Bounce Back Screenshot
So, a couple things:
1.) The physics system should already cause the ball to bounce if you've set up the colliders and rigidbodies properly. You should only need to do something like this if the ball should gain momentum when it bounces, which is unlikely. You should post screenshots of their inspectors if this answer doesn't help.
2.) On your rb.AddForce() call, you're applying a force in world-space, which may be the wrong direction to bounce. If you know the ball is oriented the way it's moving, then you can call AddRelativeForce with the same parameters. If the ball's orientation is not controlled, then you need to calculate the correct world-space direction to use before applying the force.
3.) Finally, just to confirm, the objects with BounceBack attached do have a non-zero value in the 'force' parameter in the inspector, right?

Unable to change position of ParticleEffect using update method

I am building a flappy bird style side scroller game and currently implementing collectible items for the main sprite to collect as it flies. I am not moving the main sprite but moving the background using ParallaxEffect and intend to move the collectibles (called orbs) towards the main sprite (bird). The Orbs are rendered in random positions but the position is not changed even after the update method is called.
Here is my CollectibleOrbs.java
public class CollectibleOrbs {
private static final int ORB_COUNT = 10;
private Array<Orb> orbs;
private Orb orb;
public CollectibleOrbs(){
orbs = new Array<Orb>();
for(int i=0;i<ORB_COUNT; i++) {
orb = new Orb();
orbs.add(orb);
}
}
public void update(float delta){
for(Orb orb: orbs){
orb.update(delta);
}
}
public void render(SpriteBatch sb){
for(Orb orb:orbs){
orb.draw(sb);
}
}
private class Orb{
private ParticleEffect effect;
private Vector2 position;
private Random rand;
public Orb(){
effect = new ParticleEffect();
rand = new Random();
position = new Vector2(rand.nextInt(Gdx.graphics.getWidth()),rand.nextInt(Gdx.graphics.getHeight()));
effect.load(Gdx.files.internal("particle/orbred.p"),
Gdx.files.internal("particle"));
effect.setPosition(position.x,position.y);
}
public void draw(SpriteBatch sb){
effect.draw(sb,Gdx.graphics.getDeltaTime());
}
public void update(float dt){
if(position.x< 10){
position.x = rand.nextInt(Gdx.graphics.getWidth());
position.y = rand.nextInt(Gdx.graphics.getHeight());
}
else
{
position.x-= 100*dt;
}
}
}
}
The orbs are rendered but they are not moving whereas the bird animation and the parallax background does:
I am calling the update method of CollectibleOrb class in the update of my game state and respectively for the render method while passing required parameters. How do to make sure the orbs move on the game screen?
The problem is that position is just unrelated to effect vector. Changing just position won't change effect's position. One way to solve it:
public void update(float dt){
if(position.x< 10){
position.x = rand.nextInt(Gdx.graphics.getWidth());
position.y = rand.nextInt(Gdx.graphics.getHeight());
}
else
{
position.x-= 100*dt;
}
// you should update ParticleEffect position too, just like you did in the constructor
effect.setPosition(position.x, position.y);
}

Check collision of 2 objects in libgdx

I am making a game in libgdx, where you shoot aliens with bullets. I have 2 ArrayLists of objects and would like to check if any of objects in bulletArrayList is colliding with any object from alienArrayList. What is the best way to do that? I was thinking of contactListener.
In the screen class I am generating objects like this:
public class PlayScreen implements Screen, InputProcessor,ContactListener {
public ArrayList<Alien> alienArrayList = new ArrayList<Alien>();
public ArrayList<Bullet> bulletArrayList = new ArrayList<Bullet>();
public void generateAlien() {
alien = new Alien();
alienArrayList.add(alien);
}
public void shootBullet(float x, float y) {
//send x,y moving coordiantes
bullet = new Bullet(x,y);
bulletArrayList.add(bullet);
}
}
In object class I have Rectangle box which i am moving like this:
public class Alien {
public Alien() {
bound = new Rectangle( x, y, alienRegion.getRegionWidth(), alienRegion.getRegionHeight());
}
public void update(float delta) {
bound.y -= speed * delta;
}
public void render(SpriteBatch batch, float delta) {
update(delta);
elapsedTime += Gdx.graphics.getDeltaTime();
alienRegion = (TextureRegion) alien.getKeyFrame(elapsedTime, true);
batch.draw(alienRegion, getBound().x, getBound().y);
}
}
Because you are using Rectangles in your Alien class, we can use a class called Intersector which has static methods to check for collision detection.
for(Alien alien1: alienArrayList) {
for(Alien alien2 : bulletArrayList) {
if(Intersector.overlaps(alien1.rect, alien2.rect)) {
// Collision code
}
}
}
First, we iterate through the two lists using a nested special for loop. Then we pass two Rectangles to the Intersector.overlaps(rect1, rect2). This is a static method defined in the Intersector class which will return true if the rectangles are overlapping.
Also, this code can go straight into your render method.
This code is not the most optimized because it will check 2 rects twice however, I will leave the optimization to you.
I hope that this answer was helpful and if you have any further questions please feel free to post a comment below.

LibGDX making a rectangle move on its own

public class gameMain implements Screen {
final main game;
SpriteBatch batch;
Texture img;
private Texture alexTexture;
private Rectangle alex;
private Texture cTex;
private Texture dropper;
private Texture ender;
private Texture partsImg;
private Texture toy;
private OrthographicCamera camera;
private Array<Rectangle> part; // ******
private long lastDropTime;
private int beltSpeed = 100; // ******
//Score Keeper
private int score;
private String scoreName;
//basically a create method
public gameMain(final main gam){
this.game = gam;
// load images into memory
dropper = new Texture("android/assets/dropper.png");
ender = new Texture("android/assets/endOfBelt.png");
partsImg = new Texture("android/assets/unmadeToyParts.png");
toy = new Texture("android/assets/toymade.png");
cTex = new Texture("android/assets/conveyerBeltBackground.png");
alexTexture = new Texture(Gdx.files.internal("android/assets/alexAlpha2.png"));
// set the game window resolution
camera = new OrthographicCamera();
camera.setToOrtho(false, 1080,720);
// Alex's position / hitbox
alex = new Rectangle();
alex.x = 250;
alex.y = 150;
alex.width = 126;
alex.height = 75;
// part stuff
part = new Array<Rectangle>();
spawnPart();
// score handler
score = 0;
scoreName = "Toys Made: ";
}
private void spawnPart(){ // *******
Rectangle parts = new Rectangle();
parts.x = 0;
parts.y = 210;
parts.width = 52;
parts.height = 60;
part.add(parts);
lastDropTime = TimeUtils.nanoTime();
} //********
#Override
public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
// load alex sprite
game.batch.setProjectionMatrix(camera.combined);
// begin drawing to screen
game.batch.begin();
batch.draw(cTex, -5, 200); // draw conveyer background
batch.draw(dropper, 0, 210); // draw the dropper
batch.draw(ender, 600, 200); // draw the ender
game.batch.draw(alexTexture, alex.x, alex.y); // draw alex
for(Rectangle parts: part){
game.batch.draw(partsImg, parts.x, parts.y); // draw part
}
game.font.draw(game.batch, scoreName, 25, 100); // draw scoreboard
game.batch.end(); // end drawing to screen
//******************************************************************************
//HERE IS WHERE I AM TRYING TO PUT IT
part.x += beltspeed;
if (part.rectangle overlaps ender.rectangle){
despawn part;
}
//******************************************************************************
}
#Override
public void show() {
}
#Override
public void hide() {
}
#Override
public void pause() {
}
#Override
public void resume() {
}
#Override
public void resize(int width, int height) {
}
#Override
public void dispose() {
}
}
Hello I am very new to LibGDX, and after doing some research I decided to make a game where you are a factory worker named Alex and you build toys. I will gladly take any feedback you have to make my code more orginized or work better. I highlighted everything I believe to be relevant to my question with some asterisks.
But my question is: How do you make a 'rectangle' such as my 'part' move on its own. I added a beltspeed and a spawn zone, and once the hitbox for it goes over the 'ender' hitbox I would like to despawn it.
Also I haven't gotten this far yet, but when the 'part' hitbox passes over 'Alex' hitbox I would like a little minigame to appear where you have to press up, down, left, right (randomly) to build the toy. If you have any suggestions on how I should handle that, I would be very appreciative.
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Files\Java\jdk1.7.0_79\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\resources.jar;C:\Program 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Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.1.1\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.rafiredog.game.desktop.DesktopLauncher
Exception in thread "LWJGL Application" java.lang.NullPointerException
at com.rafiredog.game.gameMain.render(gameMain.java:97)
at com.badlogic.gdx.Game.render(Game.java:46)
at com.rafiredog.game.main.render(main.java:45)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:223)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:124)
Process finished with exit code 0
Lastly, I am now getting this error. I moved some code around near the 'batch.draw'. However that might not be the cause of the error? I am a little lost right now. But I will gladly screenshot what I have of the game now once the errors are resolved.
Thank you for any insight you have on fixing up this game.
You need to do game updates and then rendering on each cycle of the game loop. The game update part of your code can iterate through your objects to do stuff to them.
For example, your render method would look like this. You need to explicitly use an Iterator for your for loop because you otherwise could not remove items from the list while iterating.
#Override
public void render(float delta) {
//Update game
Iterator<Rectangle> iterator = parts.iterator();
while (iterator.hasNext()){
Rectangle part = iterator.next();
part.x += beltSpeed * delta; //distance = speed * time
if (part.rectangle.overlaps(ender.rectangle)){
iterator.remove(); //removes rectangle from the list
}
}
//This is also where you would update movement for anything else,
//such as a character jumping, or counting down a timer and spawning
//something when it reaches zero, for example.
//Draw everything
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
game.batch.setProjectionMatrix(camera.combined);
game.batch.begin();
//...
game.batch.end();
}
If you spawn and "despawn" a lot of objects, you will probably need to use pooling to avoid stutters from memory deallocation. You can do this by replacing new Rectangle() with Pools.obtain(Rectangle.class) and adding the line Pools.free(part) right after iterator.remove().
I also noticed you have counter-intuitive usage of the words "part" and "parts" by swapping plural and singular. Make sure that doesn't trip you up.
As for your NullPointerException, read here.
Piggy backing onto Tenfour04's answer and attempting to answer your question in the comments. I'd suggest looking at this link: https://github.com/libgdx/libgdx/wiki/The-life-cycle

Some Actions do not work

I want to make a text appear in the center of the screen, indicating
the current level. It should appear gradually and after a while disappear gradually. I'm using scene2d with stages, actors.. so i would use Actions.
This is what i have now:
public class TextActor extends Actor {
private BitmapFont font;
private CharSequence charSequence;
public TextActor(CharSequence charSequence) {
font = new BitmapFont(Gdx.files.internal("fonts/white_standard_font.fnt"));
this.charSequence = charSequence;
}
#Override
public void act(float delta) {
super.act(delta);
}
#Override
public void draw(Batch batch, float delta) {
super.draw(batch, delta);
font.draw(batch, charSequence, getX(), getY());
}
}
In the class that creates the TextActor..
textActor.addAction(Actions.sequence(Actions.fadeIn(1f), Actions.delay(1f), Actions.fadeOut(1f), new Action() {
#Override
public boolean act(float delta) {
textActor.remove();
transitionInProgress = false;
gameState = GameState.RUNNING;
Gdx.input.setInputProcessor(stage);
return true;
}
}));
gameTable.addActor(textActor);
fadeIn, fadeOut, alpha.. don't work. I tried with "moveBy" and it works, so it seems a problem concerning the appearance of the Actor. There is something that escapes me.
The fade actions modify the alpha value of the Actor's color (getColor().a). You're drawing the font directly without applying the color associated with the actor.
Take a look at how Label.draw is implemented for a better understanding. In the meantime, just try adding this above your font.draw(...) call:
font.setColor(getColor())
Or, if you don't want to modify the entire color, just the alpha, try this:
font.getColor().a = getColor().a;
UPDATE:
Also note that you should apply the parentAlpha (second parameter of draw - labelled as delta in your example) to the final alpha:
font.getColor().a = getColor().a * parentAlpha
This allows your actor to fade if you change the alpha of the stage or any parents.