如何在libgdx中将精灵表/纹理区域从1个角点设置为触摸点？

Question

I was developing a game using the Libgdx game library. I came up with this problem while trying to animate from one corner point to touch point using libgdx. Used this tutorial for understanding basics of Libgdx animation basics Link .

I am not able to find how animations in libgdx works,Normal movement of frames takes place but how to start single time normal animation upon touch on screen. Thanks in advance for help.

Edit: My class implements Screen This is what i tried

In class default constructor

animation=new Animation(1/15f, atlas1.getRegions());

In Render method :- To check touch

public void touched()
{
    if(Gdx.input.isTouched())
    {
        touched = true;
        x = Gdx.input.getX();
        y = Gdx.input.getY();
        velocityX = (x - animationX) / 100;
        velocityY = (y - animationY) / 100;
    }
}

After calling touch method For animation

public void anim()
{
    if (touched) 
    {
         elapsedTime += Gdx.graphics.getDeltaTime();
         //animationX += velocityX;
        // animationY += velocityY;
         batch.draw(animation.getKeyFrame(elapsedTime, false), x, y);
         animfinished=animation.isAnimationFinished(elapsedTime);
     }
    if(touched)
    {
          batch.draw(bullettouch, x, y, bullettouch.getRegionWidth(), bullettouch.getRegionHeight());
    }
}

Answer 1

You can use InputListener for touch event and use this to control your animation.

Below is simple approach. Of course, more proper would be to extend Animation class and move there all animation logic.

public class AnimationTest implements ApplicationListener, InputListener {

    boolean touched = false;
    Animation animation;
    float elapsedTime = 0;
    float touchedX, touchedY;
    float animationX, animationY;
    float velocityX, velocityY;

    //  ... do not forget to register InputListener here ...

    @Override
    public boolean touchDown(InputEvent event, float x, float y, int pointer,int button) {
        touched = true;
        touchedX = x;
        touchedY = y;
        velocityX = (touchedX - animationX) / 100;
        velocityY = (touchedY - animationY) / 100;
    }

    // ... 

    @Override
    public void render() {
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

        batch.begin();

        if (touched) {
            elapsedTime += Gdx.graphics.getDeltaTime();
            animationX += velocityX;
            animationY += velocityY;
            batch.draw(animation.getKeyFrame(elapsedTime, true), animationX, animationY);
        }

        batch.end();
    }

}

This is where animation occurs:

batch.draw(animation.getKeyFrame(elapsedTime, true), animationX , animationY);

You just gets appropiate keyframe from your animation and draws this on batch.

Answer 2

public void anim()
{
    if (touched) 
    {
         elapsedTime += Gdx.graphics.getDeltaTime();
         //animationX += velocityX;
        // animationY += velocityY;
         batch.draw(animation.getKeyFrame(elapsedTime, false), x, y);
         animfinished=animation.isAnimationFinished(elapsedTime);
     }
    if(touched)
    {
          batch.draw(bullettouch, x, y, bullettouch.getRegionWidth(), bullettouch.getRegionHeight());
    }
}