Screen Transitions - Learning LibGDX Game Development - page 297

public static final int UP_DOWN = 3;
private static final ScreenTransitionSlice instance =
new ScreenTransitionSlice();
private float duration;
private int direction;
private Interpolation easing;
private Array<Integer> sliceIndex = new Array<Integer>();
public static ScreenTransitionSlice init (float duration,
int direction, int numSlices, Interpolation easing) {
instance.duration = duration;
instance.direction = direction;
instance.easing = easing;
// create shuffled list of slice indices which determines
// the order of slice animation
instance.sliceIndex.clear();
for (int i = 0; i < numSlices; i++)
instance.sliceIndex.add(i);
instance.sliceIndex.shuffle();
return instance;
}
@Override
public float getDuration () {
return duration;
}
@Override
public void render (SpriteBatch batch, Texture currScreen,
Texture nextScreen, float alpha) {
float w = currScreen.getWidth();
float h = currScreen.getHeight();
float x = 0;
float y = 0;
int sliceWidth = (int)(w / sliceIndex.size);
Gdx.gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.begin();
batch.draw(currScreen, 0, 0, 0, 0, w, h, 1, 1, 0, 0, 0,
currScreen.getWidth(), currScreen.getHeight(),
false, true);
if (easing != null) alpha = easing.apply(alpha);