How do I scale or set the the size of an ImageIcon in Java?

Question

I can not find a way to set the size of an ImageIcon placed in a JLabel. I i.e. want to load image with size 32x32, but paint in size of 16x16 pixel (or 144 dpi).

I can no where find a way to set the Icons size to 16x16. I tried to save the png with double DPI, but that gets ignored.

There has to be a way to draw Icons with other dimensions (like 2x - 2px for 1px, works well for images) too, but I don't see it. Thx!

I can not find a setter for width/height, dimension, dpi or anything similar.

Answer 1

Nevermind, I found a way: Just create a class ScaledIcon which implements the Icon Interface, takes the image, width and height as constructor, then implemented my own paintIcon method, which draws the icon with the preferred width and height (as set in Constructor) Usage: JLabel label = new JLabel("Some Text", new ScaledIcon(originalIcon.getImage(), 16, 16), SwingConstants.HORIZONTAL);

Draws the Icon fine with higher DPI, works as expected (i.e. if UI is scaled to 200%), I get the desired result, finally a crisp icon (when loading a 32x32px version scaled to 16x16px).

ScaledIcon class:

public class ScaledIcon implements Icon {
    private final Image image;
    private final int width;
    private final int height;

    public ScaledIcon(Image image, int width, int height) {
        this.image = image;
        this.width = width;
        this.height = height;
    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.drawImage(image, x, y, width, height, c);
    }

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

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