How to embed an Image onto a Shape?

Question

I'd like to use Shape.contains() and intersects() functionalities on clipped free-form Images on a custom component. Could we embed an Image into a Shape? If the answe is yes, then, how?
If Shape is not usable, then, how could we achieve similar functionalities on Images? Do we only have run-of-the-mill coord caluculation?

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class ImageShapes extends JPanel {
    BufferedImage image;
    Shape[] shapes;
    JLabel xLabel, yLabel;
    ImageShapes(BufferedImage image) {
        this.image = image;
    public void setCoordinates(Point p) {
        String sx = "";
        String sy = "";
        if(p != null) {
            sx = String.valueOf(p.x);
            sy = String.valueOf(p.y);
        xLabel.setText(sx);
        yLabel.setText(sy);
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if(shapes == null)
            initShapes();
        Shape origClip = g2.getClip();
        for(int j = 0; j < shapes.length; j++) {
            g2.setClip(shapes[j]);
            Rectangle r = shapes[j].getBounds();
            // center image in clip shape
            int x = r.x + (r.width - image.getWidth())/2;
            int y = r.y + (r.height - image.getHeight())/2;
            g2.drawImage(image, x, y, this);
            // smooth the edges of the clipped image
            g2.setClip(null);  // or origClip
            g2.setPaint(getBackground());
            g2.draw(shapes[j]);
    private void initShapes() {
        int w = getWidth();
        int h = getHeight();
        shapes = new Shape[3];
        shapes[0] = new Ellipse2D.Double(w/2, h/3, 175, 175);
        int R = 60;
        int sides = 5;
        int[][]xy = generateShapeArrays(w/4, h/4, R, sides);
        shapes[1] = new Polygon(xy[0], xy[1], sides);
        GeneralPath path = new GeneralPath();
        double x1 = w/4;
        double y1 = h*9/16;
        double ctrlx1 = w*9/32;
        double ctrly1 = h*5/16;
        double ctrlx2 = w*11/16;
        double ctrly2 = h*9/16;
        double x2 = w/4;
        double y2 = h*15/16;
        CubicCurve2D curve = new CubicCurve2D.Double(x1, y1, ctrlx1, ctrly1,
                                                     ctrlx2, ctrly2, x2, y2);
        path.append(curve, false);
        AffineTransform at = AffineTransform.getTranslateInstance(w/2, 0);
        at.scale(-1,1);
        Shape left = at.createTransformedShape(curve);
        path.append(left, false);
        shapes[2] = path;
    private int[][] generateShapeArrays(int cx, int cy, int R, int sides) {
        int radInc = 0;
        if(sides % 2 == 0)
            radInc = 1;
        int[] x = new int[sides];
        int[] y = new int[sides];
        for(int i = 0; i < sides; i++) {
            x[i] = cx + (int)(R * Math.sin(radInc*Math.PI/sides));
            y[i] = cy - (int)(R * Math.cos(radInc*Math.PI/sides));
            radInc += 2;
        // keep base of triangle level
        if(sides == 3)
            y[2] = y[1];
        return new int[][] { x, y };
    private JPanel getLabels() {
        xLabel = new JLabel(" ");
        yLabel = new JLabel(" ");
        Dimension d = new Dimension(45, 25);
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(2,2,2,2);
        gbc.weightx = 1.0;
        addComponents(new JLabel("x"), xLabel, panel, gbc, d, false);
        addComponents(new JLabel("y"), yLabel, panel, gbc, d, true);
        panel.setBorder(BorderFactory.createEtchedBorder());
        return panel;
    private void addComponents(JComponent c1, JComponent c2, Container c,
                               GridBagConstraints gbc, Dimension d, boolean b) {
        gbc.anchor = gbc.EAST;
        c.add(c1, gbc);
        c2.setPreferredSize(d);
        gbc.weightx = b ? 1.0 : 0;
        gbc.anchor = gbc.WEST;
        c.add(c2, gbc);
    public static void main(String[] args) throws IOException {
        BufferedImage image = ImageIO.read(new File("images/cougar.jpg"));
        ImageShapes test = new ImageShapes(image);
        test.addMouseMotionListener(new ShapeFinder(test));
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test);
        f.getContentPane().add(test.getLabels(), "Last");
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
class ShapeFinder extends MouseMotionAdapter {
    ImageShapes imageShapes;
    boolean hovering = false;
    ShapeFinder(ImageShapes c) {
        imageShapes = c;
    public void mouseMoved(MouseEvent e) {
        Point p = e.getPoint();
        boolean haveSelection = false;
        Shape[] shapes = imageShapes.shapes;
        if(shapes == null) return;
        for(int j = 0; j < shapes.length; j++) {
            if(shapes[j].contains(p)) {
                haveSelection = true;
                imageShapes.setCoordinates(p);
                if(!hovering)
                    hovering = true;
        if(!haveSelection && hovering) {
            hovering = false;
            imageShapes.setCoordinates(null);
}