Is it possible to create an ImageIcon with Path2D.Double()?

Question

A new Toolbar with buttons should initialize objects which have a Shape (Path2D path=new Path2D.Double()).

The Shape of these Objects should be added to the button as an ImageIcon. Can I avoid making icons by myself with using something like gimp?

What would be the way to go? Any help would be appreciated.

Answer 1

Here is two possibilities to convert a shape to the icon. Either you can create BufferedImage object and draw your Shape into this image, or you can create an implementation of interface Icon around your Shape.

Here is the example

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Path2D;
import java.awt.image.BufferedImage;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JToolBar;
import javax.swing.WindowConstants;

public class IconTest {

    public static void main(String[] args) {
        Path2D path = new Path2D.Double();
        path.moveTo(0, 0);
        path.lineTo(15, 0);
        path.lineTo(8, 15);
        path.lineTo(0, 0);
        JToolBar toolbar = new JToolBar();
        // use Icon wrapper around the shape
        JButton btn = new JButton(new ShapeIcon(path, Color.CYAN));
        btn.setFocusable(false);
        toolbar.add(btn);
        // use conversion of shape into the icon
        btn = new JButton(toIcon(path, Color.GREEN));
        btn.setFocusable(false);
        toolbar.add(btn);
        JFrame frm = new JFrame("Test");
        frm.add(toolbar, BorderLayout.NORTH);
        frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frm.setSize(400, 300);
        frm.setLocationRelativeTo(null);
        frm.setVisible(true);
    }

    private static Icon toIcon(Shape shape, Color color) {
        BufferedImage img = new BufferedImage(shape.getBounds().width, shape.getBounds().height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = img.createGraphics();
        g2.setColor(color);
        g2.fill(shape);
        // g2.draw(shape);
        g2.dispose();
        return new ImageIcon(img);
    }

    private static class ShapeIcon implements Icon {

        private final Shape shape;

        private final Color color;

        /**
         * @param shape
         */
        public ShapeIcon(Shape shape, Color color) {
            this.shape = shape;
            this.color = color;
        }

        @Override
        public void paintIcon(Component c, Graphics g, int x, int y) {
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(color);
            AffineTransform transform = new AffineTransform();
            transform.translate(x, y);
            g2.fill(transform.createTransformedShape(shape));
            // g2.draw(transform.createTransformedShape(shape));
        }

        @Override
        public int getIconWidth() {
            return shape.getBounds().width;
        }

        @Override
        public int getIconHeight() {
            return shape.getBounds().height;
        }

    }
}