Screen Transitions - Learning LibGDX Game Development - page 291

Now, create a new file for the ScreenTransitionFade class and add the
following code:
package com.packtpub.libgdx.canyonbunny.screens.transitions;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Interpolation;
public class ScreenTransitionFade implements ScreenTransition {
private static final ScreenTransitionFade instance =
new ScreenTransitionFade();
private float duration;
public static ScreenTransitionFade init (float duration) {
instance.duration = duration;
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();
alpha = Interpolation.fade.apply(alpha);
Gdx.gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.begin();
batch.setColor(1, 1, 1, 1);
batch.draw(currScreen, 0, 0, 0, 0, w, h, 1, 1, 0, 0, 0,
currScreen.getWidth(), currScreen.getHeight(),
false, true);