How to jump? [libGDX] [box2D]

General Discussions
#1

Hi, I’m tryin dot my character jump, but I can’t do correctly it. I was experimenting per days how do it, but I can’t do a correct jump…

I have a class for control the Player movements, so it is this:


package com.unclain.udevelop.prueba1.utils;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input.Keys;
import com.badlogic.gdx.graphics.FPSLogger;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.World;
import com.unclain.udevelop.prueba1.contacts.ContactCheck;

public class CharacterController {
	
	private boolean jump = false;
	
	private static final int MAX_VELOCITY = 1002;
		
	private Body bodyPlayer;
	private FixtureDef fixtureDefPlayer;
	private Fixture fixturePlayer;
	
	private boolean isPlayerGrounded;;
	
	private Vector2 vel;
	
	private ContactCheck checker;
	
	private World world;
	
	private FPSLogger fps;
	
	public CharacterController(World world, Body bodyPlayer, Fixture fixturePlayer, FixtureDef fixtureDefPlayer){
		this.bodyPlayer = bodyPlayer;
		this.fixtureDefPlayer = fixtureDefPlayer;
		this.fixturePlayer = fixturePlayer;
		vel = bodyPlayer.getLinearVelocity();
		this.world = world;
		addKeyControls();
		fps = new FPSLogger();
		System.out.println("¿is Grounded? (CharacterController) " + isPlayerGrounded);
	}
	
	public void addKeyControls(){
		if(Gdx.input.isKeyPressed(Keys.D)){
			bodyPlayer.applyLinearImpulse(new Vector2(400, 0), bodyPlayer.getPosition());
		} else if(Gdx.input.isKeyPressed(Keys.A)){
			bodyPlayer.applyLinearImpulse(new Vector2(-400, 0), bodyPlayer.getPosition());
		} else if(Gdx.input.isKeyPressed(Keys.W)){
			jump = true;
			jumpControls();
		} else {
			bodyPlayer.getLinearVelocity().x = 0;
		}
	}
	
	public void jumpControls(){
		checker = new ContactCheck(world, bodyPlayer, fixturePlayer);
		isPlayerGrounded = checker.isGrounded();
		vel = bodyPlayer.getLinearVelocity();
		if(isPlayerGrounded = true){
			fixtureDefPlayer.friction = 1f;
		}
		
		if(jump){
			fixtureDefPlayer.friction = 0f;
			fixtureDefPlayer.density = 0f;
			fixtureDefPlayer.restitution = 0f;
			bodyPlayer.applyLinearImpulse(new Vector2(0.01f, 2000), bodyPlayer.getPosition());
			System.out.println("Jump = " + jump);
			jump = false;
			bodyPlayer.getLinearVelocity().x += (Gdx.graphics.getDeltaTime() * 20);
		} else if(isPlayerGrounded = false){
			fixtureDefPlayer.friction = 1000f;
			bodyPlayer.getLinearVelocity().y -= world.getGravity().y - (Gdx.graphics.getDeltaTime() * 30);
			bodyPlayer.getLinearVelocity().x -= (Gdx.graphics.getDeltaTime() * 30);
			System.out.println("Vel.x " + bodyPlayer.getLinearVelocity().x + "Vel.y " + bodyPlayer.getLinearVelocity().y);
		}
	}
	
}

Can somebody give me a example of how to do it?

¡Thanks!

#2

I don’t know if it’s relevant, but you have a = instead of a == in your last if so it will always be false.

else if(isPlayerGrounded = false)

Besides that, I would just apply a linear impulse to the player’s body, but you’re already doing this among other things.