GlowText.java

package arcane.ui.util;

import javax.swing.*;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.text.BreakIterator;
import java.util.Locale;

/**
 * <p>GlowText class.</p>
 *
 * @author Forge
 * @version $Id: GlowText.java 10038 2011-06-25 08:29:06Z jendave.hudson@gmail.com $
 */
public class GlowText extends JLabel {
    /** Constant <code>serialVersionUID=-2868833097364223352L</code> */
    private static final long serialVersionUID = -2868833097364223352L;
    private int glowSize;
    private Color glowColor;
    private boolean wrap;

    /**
     * <p>setGlow.</p>
     *
     * @param glowColor a {@link java.awt.Color} object.
     * @param size a int.
     * @param intensity a float.
     */
    public void setGlow(Color glowColor, int size, float intensity) {
        this.glowColor = glowColor;
        this.glowSize = size;
    }

    /**
     * <p>Setter for the field <code>wrap</code>.</p>
     *
     * @param wrap a boolean.
     */
    public void setWrap(boolean wrap) {
        this.wrap = wrap;
    }

    /**
     * <p>getPreferredSize.</p>
     *
     * @return a {@link java.awt.Dimension} object.
     */
    public Dimension getPreferredSize() {
        Dimension size = super.getPreferredSize();
        size.width += glowSize;
        size.height += glowSize / 2;
        return size;
    }

    /** {@inheritDoc} */
    public void setText(String text) {
        super.setText(text);
    }

    /** {@inheritDoc} */
    public void paint(Graphics g) {
        if (getText().length() == 0) return;

        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

        Dimension size = getSize();
        int textX = 0, textY = 0;
        int wrapWidth = Math.max(0, wrap ? size.width - glowSize : Integer.MAX_VALUE);

        AttributedString attributedString = new AttributedString(getText());
        attributedString.addAttribute(TextAttribute.FONT, getFont());
        AttributedCharacterIterator charIterator = attributedString.getIterator();
        FontRenderContext fontContext = g2d.getFontRenderContext();

        LineBreakMeasurer measurer = new LineBreakMeasurer(charIterator, BreakIterator.getWordInstance(Locale.ENGLISH), fontContext);
        int lineCount = 0;
        while (measurer.getPosition() < charIterator.getEndIndex()) {
            measurer.nextLayout(wrapWidth);
            lineCount++;
            if (lineCount > 2) break;
        }
        charIterator.first();
        // Use char wrap if word wrap would cause more than two lines of text.
        if (lineCount > 2)
            measurer = new LineBreakMeasurer(charIterator, BreakIterator.getCharacterInstance(Locale.ENGLISH), fontContext);
        else
            measurer.setPosition(0);
        while (measurer.getPosition() < charIterator.getEndIndex()) {
            TextLayout textLayout = measurer.nextLayout(wrapWidth);
            float ascent = textLayout.getAscent();
            textY += ascent; // Move down to baseline.

            g2d.setColor(glowColor);
            g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f));
            textLayout.draw(g2d, textX + glowSize / 2 + 1, textY + glowSize / 2 - 1);
            textLayout.draw(g2d, textX + glowSize / 2 + 1, textY + glowSize / 2 + 1);
            textLayout.draw(g2d, textX + glowSize / 2 - 1, textY + glowSize / 2 - 1);
            textLayout.draw(g2d, textX + glowSize / 2 - 1, textY + glowSize / 2 + 1);

            g2d.setColor(getForeground());
            g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f));
            textLayout.draw(g2d, textX + glowSize / 2, textY + glowSize / 2);

            textY += textLayout.getDescent() + textLayout.getLeading(); // Move down to top of next line.
        }
    }
}