Java Image Create createImageFromVisibleComponent(JComponent comp, int cw, int ch)

Description

create Image From Visible Component

License

Open Source License

Declaration

public static BufferedImage createImageFromVisibleComponent(JComponent comp, int cw, int ch) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.awt.Graphics;

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

import java.awt.Image;

import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;

import javax.swing.JComponent;

public class Main {
    public static BufferedImage createImageFromVisibleComponent(JComponent comp, int cw, int ch) {
        BufferedImage retImage = null;
        if (comp == null)
            return retImage;
        try {// ww  w  .  j av  a  2 s  .  c o  m
            GraphicsEnvironment genv = GraphicsEnvironment.getLocalGraphicsEnvironment();
            GraphicsDevice gd = genv.getDefaultScreenDevice();
            GraphicsConfiguration gc = gd.getDefaultConfiguration();
            java.awt.image.ColorModel cm = gc.getColorModel();
            boolean hasAlpha = cm.hasAlpha();
            if (hasAlpha) {
                retImage = gc.createCompatibleImage(cw, ch);
            } else {
                retImage = new BufferedImage(cw, ch, BufferedImage.TYPE_INT_ARGB);
            }
            if (retImage == null)
                return retImage;
            Graphics og = retImage.getGraphics();
            comp.paint(og);
            og.dispose();
        } catch (Throwable t) {
            t.printStackTrace();
        }
        return retImage;
    }

    /**
     * Checks for alpha.
     * 
     * @param image
     *            the image
     * 
     * @return true, if successful
     */
    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage) image;
            return bimage.getColorModel().hasAlpha();
        }

        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }
}

Related

1. createImage(String str)
2. createImage(URL url, String description, boolean checkPresence)
3. createImageCopy(Image image)
4. createImageFromBase64String(String s)
5. createImageFromInvisibleComponent(JComponent component)
6. createImagePanel(Image image, Color backColor)
7. getImage(Class clazz, String path)
8. getImage(Component component)
9. getImage(Component component)