Tuesday, October 23, 2012

Scale image using Graphics2D.scale()

Example to draw scaled bufferedImage on  Graphics2D:

scaled bufferedImage on  Graphics2D

package javaswing;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.Box;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

/**
*
* @web http://java-buddy.blogspot.com/
*/
public class JavaTestSwing {

static JFrameWin jFrameWindow;

public static class MyComponent extends JComponent{

BufferedImage bufferedImage = null;
Dimension myDimension = new Dimension(50, 50);

public MyComponent() {
try {
bufferedImage = ImageIO.read(this.getClass().getResource("duke.png"));
int imageWidth = bufferedImage.getWidth();
int imageHeight = bufferedImage.getHeight();
myDimension = new Dimension(imageWidth * 2, imageHeight * 2);
} catch (IOException ex) {
Logger.getLogger(JavaTestSwing.class.getName()).log(Level.SEVERE, null, ex);
}
}


@Override
public Dimension getPreferredSize() {
return myDimension;
}

@Override
public Dimension getMaximumSize() {
return myDimension;
}

@Override
public Dimension getMinimumSize() {
return myDimension;
}

@Override
protected void paintComponent(Graphics g) {

//g.drawImage(bufferedImage, 0, 0, null);
Graphics2D graphics2D;

//2X
graphics2D = (Graphics2D)g.create();
graphics2D.scale(2, 2);
graphics2D.drawImage(bufferedImage, 0, 0, null);

//1X
graphics2D = (Graphics2D)g.create();
graphics2D.drawImage(bufferedImage, 0, 0, null);

//0.5X
graphics2D = (Graphics2D)g.create();
graphics2D.scale(0.5, 0.5);
graphics2D.drawImage(bufferedImage, 0, 0, null);

//dispose Graphics2D object
graphics2D.dispose();
}
}

public static class JFrameWin extends JFrame{
public JFrameWin(){
this.setTitle("java-buddy.blogspot.com");
this.setSize(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

MyComponent myComponent = new MyComponent();

Box horizontalBox = Box.createHorizontalBox();

horizontalBox.add(myComponent);
this.add(horizontalBox);
}
}


public static void main(String[] args){
Runnable doSwingLater = new Runnable(){
public void run() {
jFrameWindow = new JFrameWin();
jFrameWindow.setVisible(true);
}
};

SwingUtilities.invokeLater(doSwingLater);

}

}


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