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Editorial Team
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Asked: 2026-06-18T06:54:28+00:00

I’ve got a GameScreen class that has a touchpad within it. I have a

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I’ve got a GameScreen class that has a touchpad within it. I have a method (setTouchpadY()) within the GameScreen class that gets the touchpad’s getKnobPercentY.

public float setTouchpadY() {
  return touchpad.getKnobPercentY();

}

In my WorldRenderer class, the render() method, I’m trying to rotate a sprite with the touchpad. gs is the GameScreen class

public void render() {
  //render stuff
  moveCamera(leon.getPosition().x, CAMERA_HEIGHT / 2);
  spriteBatch.setProjectionMatrix(cam.combined);
  spriteBatch.begin();
  drawVillage();
  drawTile();
  drawLeon();
  spriteBatch.end();

            if (leon.isAiming()) {
     leonAimArmSpriteR.rotate(gs.setTouchpadY());         //This line causing crash
  }

}

I’ve put the touchpad and buttons into the Gamescreen class because it’s implementing Screen and Input Processor. Tried to put them into WorldRenderer with no luck so far.Here is my logcat/console, this is from trying to run the desktop version, if I need to post the android I will

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.NullPointerException
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:113)
Caused by: java.lang.NullPointerException
at com.me.RE4.view.WorldRenderer.render(WorldRenderer.java:142)
at com.me.RE4.screens.GameScreen.render(GameScreen.java:151)
at com.badlogic.gdx.Game.render(Game.java:46)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:191)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:110)

EDIT
So I’ve found that I had not instantiated GameScreen, when I did that it was saying that WorldController is the null. So I instantiated WorldController in WorldRenderer, but then it’s saying that TouchpadY() method within GameScreen is null, set the break point and that’s giving me all sorts of variables as null.

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1 Answer

  1. Editorial Team

    Alright, I was trying to do the rotation within WorldRenderer initially, within the render method so that holding the touchpad steady at a certain point would keep rotation going at that degree. I would have had to instantiate / reference a lot of items within WR for that to work, so I ended up instatiating gamescreen in WR and then referenced my sprite that I wanted to rotate in GS and then the touchpad values worked within the render method of the GS. Mucho sloppy

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