TexturedPanel.java

package com.kokakiwi.mclauncher.ui.simple.components;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.Point2D;

import javax.imageio.ImageIO;
import javax.swing.JPanel;

public class TexturedPanel extends JPanel
{
    private static final long serialVersionUID = -1577652681975914598L;
    private Image             img;
    private final Image       bgImage;
    
    public TexturedPanel(String path) throws Exception
    {
        
        this(ImageIO.read(TexturedPanel.class.getResourceAsStream("/" + path))
                .getScaledInstance(32, 32, 16));
    }
    
    public TexturedPanel(Image background)
    {
        setOpaque(true);
        bgImage = background;
    }
    
    
    public void update(Graphics g)
    {
        paint(g);
    }
    
    
    public void paintComponent(Graphics g2)
    {
        final int w = getWidth() / 2 + 1;
        final int h = getHeight() / 2 + 1;
        if (img == null || img.getWidth(null) != w || img.getHeight(null) != h)
        {
            img = createImage(w, h);
            
            final Graphics g = img.getGraphics();
            for (int x = 0; x <= w / 32; x++)
            {
                for (int y = 0; y <= h / 32; y++)
                {
                    g.drawImage(bgImage, x * 32, y * 32, null);
                }
            }
            if (g instanceof Graphics2D)
            {
                final Graphics2D gg = (Graphics2D) g;
                int gh = 1;
                gg.setPaint(new GradientPaint(new Point2D.Float(0.0F, 0.0F),
                        new Color(553648127, true),
                        new Point2D.Float(0.0F, gh), new Color(0, true)));
                gg.fillRect(0, 0, w, gh);
                
                gh = h;
                gg.setPaint(new GradientPaint(new Point2D.Float(0.0F, 0.0F),
                        new Color(0, true), new Point2D.Float(0.0F, gh),
                        new Color(1610612736, true)));
                gg.fillRect(0, 0, w, gh);
            }
            g.dispose();
        }
        g2.drawImage(img, 0, 0, w * 2, h * 2, null);
    }
}