使玩家跳至LIBGDX中的特定高度

Question

I want to implement a jump in LIBGDX on clicking buttons in LIBGDX. Everything goes fine but on clicking the button continuously the player keeps on going high .If I didn't release my button its going beyond the screen height . So, I want the player to jump only certain height on each button click and though the button is clicked continuously I want the player to go only certain height and not go beyond the screen. Here is my code,

        for (int i = 0; i < 5; i++) {
          if (buttonup.isPressed()) {
                    if (Gdx.input.isTouched(i)) {
                        gamehero.heroBody.setLinearVelocity(0, 1f);
                        Gdx.app.log("up is presd", "");
                    }
                }
         if (buttonright.isPressed()) {
                if (Gdx.input.isTouched(i)) {


                    gamehero.heroBody.setLinearVelocity(1.2f, 0);
                }
            }
        }

On executing this code, the game works just like FLAPPY BIRD. But I want to reach only certain height . I have tried various methods and referred this stack answer too but nothing helped I tired limiting the height using this.gamehero.heroBody.getLinearVelocity().y >= -1 too but didn't work . Please help . Thanks in advance

Answer 1

Implement InputListener for a class and call:

Gdx.input.setInputProcessor(thatClass);

Then override keyUp in thatClass like this:

    @Override
    public boolean keyUp (int keycode) {
       if (keycode == Keys.SPACE) {
             //code that make your bird jump
       }
    }

This will make your jump code runs only once. If you don't wan't double jumps add a boolean member alreadyJumping and set it true when the jump starts and set it false when the jump is ended.

@Override
        public boolean keyUp (int keycode) {
           if (keycode == Keys.SPACE && !alreadyJumping) {
                 alreadyJumping = true;
                 //code that make your bird jump
           }
        }

If you want your jump to slow down and you character fall decrease you velocity based on deltaTime when you render your game.