Mapping texture on polygon

Question

Hello,
I'm trying to map an image texture on a convex polygon. I know that it is easy to do with java3d but I'm restricted to standard jdk.
Does anyone has an algorithm? Sample code ?
Thanks for your help
Tanguy

Answer 1

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.swing.*;
public class Textured extends JPanel {
    private Shape shape;
    private Paint paint;
    public Textured(Shape shape, Paint paint) {
        this.shape = shape;
        this.paint = paint;
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setPaint(paint);
        g2.fill(shape);
    public static void main(String[] args) throws IOException {
        GeneralPath gp = new GeneralPath();
        gp.moveTo(300, 0);
        gp.lineTo(0,300);
        gp.quadTo(300,300,300,600);
        gp.lineTo(600,300);
        gp.quadTo(300,300,300,0);
        gp.closePath();
        URL url = new URL("http://today.java.net/jag/bio/JagHeadshot-small.jpg");
        BufferedImage image = ImageIO.read(url);
        int w = image.getWidth(), h = image.getHeight();
        Paint paint = new TexturePaint(image, new Rectangle(0,0,w/4,h/4));
        JComponent comp = new Textured(gp, paint);
        comp.setPreferredSize(new Dimension(600,600));
        JFrame f = new JFrame("Textured");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(comp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
}