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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 org.jglfont.impl.format;

import org.jglfont.JGLFontException;
import org.jglfont.spi.JGLFontRenderer;
import org.jglfont.spi.ResourceLoader;

import java.io.IOException;
import java.util.Map;

/**
 * User: iamtakingiteasy
 * Date: 2013-12-28
 * Time: 22:37
 */
public class JGLBitmapFontData extends JGLAbstractFontData {
  private String filename;

  public JGLBitmapFontData(JGLFontRenderer renderer, ResourceLoader resourceLoader, String filename) {
    super(renderer, resourceLoader);
    this.filename = filename;
  }

  @Override
  public void init() {
    initalize(extractPath(filename));
  }

  private void initalize(final String path) {
    for (Map.Entry entry : getBitmaps().entrySet()) {
      try {
        String filename = path + entry.getValue();
        getRenderer().registerBitmap(
                bitmapKey(entry.getKey()),
                resourceLoader.load(filename),
                filename);
      } catch (IOException e) {
        throw new JGLFontException(e);
      }
    }

    initGlyphs();
    getRenderer().prepare();
  }

  private String extractPath(final String filename) {
    int idx = filename.lastIndexOf("/");
    if (idx == -1) {
      return "";
    } else {
      return filename.substring(0, idx) + "/";
    }
  }

  private void initGlyphs() {
    for (Map.Entry entry : getGlyphs().entrySet()) {
      Integer c = entry.getKey();
      JGLFontGlyphInfo charInfo = entry.getValue();
      if (charInfo != null) {
        getRenderer().registerGlyph(
                charInfo.getPage(),
                c,
                charInfo.getXoffset(),
                charInfo.getYoffset(),
                charInfo.getWidth(),
                charInfo.getHeight(),
                charInfo.getX() / (float) getBitmapWidth(),
                charInfo.getY() / (float) getBitmapHeight(),
                (charInfo.getX() + charInfo.getWidth()) / (float) getBitmapWidth(),
                (charInfo.getY() + charInfo.getHeight()) / (float) getBitmapHeight());
      }
    }
  }


  private String bitmapKey(final int key) {
    return getName() + "-" + key;
  }
}