java - LibGDX 加速度计 - Android

Question

我编写了让玩家左右移动的代码，当玩家向左移动时它有一个动画，当他向右移动时它有另一个动画。

这是代码(dt 是 deltaTime):

    // Moving player desktop
    if (Gdx.input.isKeyPressed(Keys.A)) // Left
    {
        position.x -= speed * dt;
        currentFrame =  animation.getKeyFrame(4 + (int) stateTime);
    } 
    else if (Gdx.input.isKeyPressed(Keys.D)) // Right
    {
        position.x += speed * dt;
        currentFrame = animation.getKeyFrame(8 + (int) stateTime);
    }
    else // Normal
    {
        currentFrame = animation.getKeyFrame(12);
    }

所以我也想用加速度计移动播放器(在移动设备上)。我做到了，但现在我不知道如何检查玩家是向左还是向右移动以给他不同的动画

我的代码:

    // Moving player android
    // position.x -= Gdx.input.getAccelerometerX() * speed * dt;

    if( PLAYER MOVING LEFT)
    {
        // Player moving left....
        currentFrame =  animation.getKeyFrame(4 + (int) stateTime);
    }
    else if (PLAYER MOVING RIGHT)
    {
        // Player moving right....
        currentFrame =  animation.getKeyFrame(8 + (int) stateTime);
    }
    else
        currentFrame = animation.getKeyFrame(12);

Answer 1

这取决于您的游戏的方向。

position.x -= Gdx.input.getAccelerometerX() * speed * dt;

这个实现看起来不错，因为 getAccelerometerX 值返回 [-10,10] 的值。

但是，假设您的手机放在 table 上，则该值不会正好为 0。假设您想在加速度 >0.3f 时移动播放器。

 float acceleration=Gdx.input.getAccelerometerX(); // you can change it later to Y or Z, depending of the axis you want.


        if (Math.abs(acceleration) > 0.3f) // the accelerometer value is < -0.3 and > 0.3 , this means that is not really stable and the position should move
        {
           position.x -= acceleration * speed * dt; // we move it
           // now check for the animations


           if (acceleration < 0) // if the acceleration is negative
               currentFrame = animation.getKeyFrame(4 + (int) stateTime);
           else
               currentFrame = animation.getKeyFrame(8 + (int) stateTime);
           // this might be exactly backwards, you'll check for it
       } else {
           // the sensor has some small movements, probably the device is not moving so we want to put the idle animation
           currentFrame = animation.getKeyFrame(12);
       }