com.github.fauu.helix.system.ScreenFadingSystem.java Source code

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Here is the source code for com.github.fauu.helix.system.ScreenFadingSystem.java

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/*
 * Copyright (C) 2014, 2015 Helix Engine Developers
 * (http://github.com/fauu/HelixEngine)
 *
 * This software is licensed under the GNU General Public License
 * (version 3 or later). See the COPYING file in this distribution.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this software. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authored by: Piotr Grabowski <fau999@gmail.com>
 */

package com.github.fauu.helix.system;

import com.artemis.annotations.Wire;
import com.artemis.systems.VoidEntitySystem;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.github.fauu.helix.graphics.HelixCamera;

public class ScreenFadingSystem extends VoidEntitySystem {

    private ShapeRenderer shapeRenderer;

    private FadeType fadeType;

    private float fadeDuration;

    private float fadeLevel;

    @Wire
    private HelixCamera camera;

    @Override
    protected void initialize() {
        this.shapeRenderer = new ShapeRenderer();
    }

    @Override
    protected void processSystem() {
        if (fadeLevel >= fadeDuration) {
            fadeLevel = fadeDuration;
        } else if (fadeLevel <= 0) {
            fadeLevel = 0;
        }

        Gdx.gl.glEnable(GL20.GL_BLEND);
        Gdx.gl.glBlendFunc(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA);

        shapeRenderer.begin(ShapeRenderer.ShapeType.Filled);
        shapeRenderer.setColor(0, 0, 0, fadeLevel / fadeDuration);
        shapeRenderer.rect(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        shapeRenderer.end();

        Gdx.gl.glDisable(GL20.GL_BLEND);

        switch (fadeType) {
        case FADE_OUT:
            fadeLevel += Gdx.graphics.getDeltaTime();
            break;
        case FADE_IN:
            fadeLevel -= Gdx.graphics.getDeltaTime();
            break;
        default:
            throw new IllegalStateException();
        }
    }

    @Override
    protected boolean checkProcessing() {
        return fadeLevel != 0;
    }

    public void fade(FadeType type, float duration) {
        fadeType = type;
        fadeDuration = duration;

        switch (fadeType) {
        case FADE_OUT:
            fadeLevel = Gdx.graphics.getDeltaTime();
            break;
        case FADE_IN:
            fadeLevel = fadeDuration - Gdx.graphics.getDeltaTime();
            break;
        default:
            throw new IllegalStateException();
        }
    }

    public enum FadeType {
        FADE_IN, FADE_OUT;
    }

}