Java Swing Icon resize(Icon icon, int width, int height)

Description

Resizes an icon.

License

Open Source License

Parameter

Parameter	Description
icon	the icon to resize.
width	the width of the icon or 0 or smaller when the width should be relative to the size of the icon and the provided height. Not both height and width can be smaller than 0.
height	the height of the icon or 0 or smaller when the height should be relative to the size of the icon and the provided width. Not both height and width can be smaller than 0.

Return

the resized icon.

Declaration

public static Icon resize(Icon icon, int width, int height) 

Method Source Code

//package com.java2s;

import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Image;

import java.awt.image.BufferedImage;

import javax.swing.Icon;
import javax.swing.ImageIcon;

public class Main {
    /**/*from w  ww .j a  v a 2 s .  c o  m*/
     * Resizes an icon.
     * 
     * @param icon
     *            the icon to resize.
     * @param width
     *            the width of the icon or 0 or smaller when the width should be
     *            relative to the size of the icon and the provided height. Not
     *            both height and width can be smaller than 0.
     * @param height
     *            the height of the icon or 0 or smaller when the height should
     *            be relative to the size of the icon and the provided width.
     *            Not both height and width can be smaller than 0.
     * @return the resized icon.
     */
    public static Icon resize(Icon icon, int width, int height) {
        if (icon == null) {
            return icon;
        }

        if ((height <= 0 || height == icon.getIconHeight()) && (width <= 0 || width == icon.getIconWidth())) {
            return icon;
        }

        Image image = iconToImage(icon);

        if (height <= 0) {
            height = (int) (icon.getIconHeight() / (float) (icon.getIconWidth() / width));
        }

        if (width <= 0) {
            width = (int) (icon.getIconWidth() / (float) (icon.getIconHeight() / height));
        }

        return new ImageIcon(image.getScaledInstance(width, height, Image.SCALE_SMOOTH));
    }

    /**
     * Converts an Icon to an Image.
     * 
     * @param icon
     *            the icon to convert.
     * @return image the converted icon.
     */
    public static Image iconToImage(Icon icon) {
        if (icon instanceof ImageIcon) {
            return ((ImageIcon) icon).getImage();
        }

        int w = icon.getIconWidth();
        int h = icon.getIconHeight();

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        GraphicsConfiguration gc = gd.getDefaultConfiguration();
        BufferedImage image = gc.createCompatibleImage(w, h);

        Graphics2D g = image.createGraphics();
        icon.paintIcon(null, g, 0, 0);
        g.dispose();

        return image;
    }
}

Related

1. loadLoadingIcon()
2. makeButtcon(Icon icon, Icon rollover, String tooltip, boolean is_toggle)
3. mergeComponentAndIcon(JComponent component, Icon icon)
4. mergeIcons(Icon i1, Icon i2, int offsetRechtsOben)
5. reescala(Icon ic, int maxW, int maxH)
6. scaleDown(Icon icon, int maxWidth, int maxHeight)
7. setComponentTabIcon(Component component, Icon icon)
8. sizeToIcon(JComponent component, Icon icon)