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Nifty GUI is a Java Library that supports the building of interactive user interfaces for games or similar applications. It utilizes OpenGL for rendering and it can be easily integrated into many rendering systems. The configuration of the GUI is stored in xml files with little supporting Java code. In short Nifty helps you to layout stuff, display it in a cool way and interact with it :)

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package de.lessvoid.nifty.effects.impl;


import de.lessvoid.nifty.Nifty;
import de.lessvoid.nifty.effects.EffectImpl;
import de.lessvoid.nifty.effects.EffectProperties;
import de.lessvoid.nifty.effects.Falloff;
import de.lessvoid.nifty.elements.Element;
import de.lessvoid.nifty.render.NiftyRenderEngine;
import de.lessvoid.nifty.tools.Color;
import de.lessvoid.nifty.tools.SizeValue;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * This renders a quad AND interpolates the color between startColor and endColor
 * over the lifetime of the effect.
 *
 * @author void
 */
public class RenderQuad implements EffectImpl {
  @Nonnull
  private final Color currentColor = new Color("#000f");
  @Nonnull
  private final Color tempColor = new Color("#000f");
  private Color startColor;
  private Color endColor;
  private SizeValue width;

  @Override
  public void activate(
      @Nonnull final Nifty nifty,
      @Nonnull final Element element,
      @Nonnull final EffectProperties parameter) {
    startColor = new Color(parameter.getProperty("startColor", "#0000"));
    endColor = new Color(parameter.getProperty("endColor", "#ffff"));
    width = new SizeValue(parameter.getProperty("width"));
  }

  @Override
  public void execute(
      @Nonnull final Element element,
      final float normalizedTime,
      @Nullable final Falloff falloff,
      @Nonnull final NiftyRenderEngine r) {
    r.saveStates();

    currentColor.linear(startColor, endColor, normalizedTime);
    if (falloff == null) {
      r.setColor(currentColor);
    } else {
      tempColor.multiply(currentColor, falloff.getFalloffValue());
      r.setColor(tempColor);
    }

    int size = width.getValueAsInt(element.getParent().getWidth());
    if (size == -1) {
      r.renderQuad(element.getX(), element.getY(), element.getWidth(), element.getHeight());
    } else {
      r.renderQuad((element.getX() + element.getWidth() / 2) - size / 2, element.getY(), size, element.getHeight());
    }

    r.restoreStates();
  }

  @Override
  public void deactivate() {
  }
}