This small app removes unwanted background from any image. Two methods in the Graphics class,
drawPolyline and
drawPolygon are used in this program. This enables the user to clip an arbitrary shape out of an image.
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170 | import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.File;
import java.util.ArrayList;
import javax.imageio.ImageIO;
import javax.swing.*;
public class ImageClipper extends JFrame{
private JButton bopen=null;
private JPanel pmain=null;
private String fname=null;
private JButton bremove=null;
private BufferedImage bufimage=null;
private Color pixcolor[][]=null;
private ArrayList<Point> allpoint=null;
private boolean mclicked=false;
private Point tempoint=null;
private boolean mmoved=false;
private MouseHandler mh=null;
private Polygon tempoly=null;
public ImageClipper(){
super("Background Remover");
setSize(800,600);
setLayout(new BorderLayout());
bopen=new JButton("Open");
bopen.addActionListener(new ButtonHandler());
pmain=new WallImage();
//pmain.setPreferredSize(new Dimension(800,500));
mh=new MouseHandler();
pmain.addMouseListener(mh);
pmain.addMouseMotionListener(mh);
bremove=new JButton("Remove");
bremove.addActionListener(new ButtonHandler());
add("North",bopen);
add("Center",pmain);
add("South",bremove);
allpoint=new ArrayList<Point>();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
}
class WallImage extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
if(bufimage!=null){
g2.drawImage(bufimage,0,0,pmain);
}
int px[]=null;
int py[]=null;
if(allpoint.size()>0){
px=new int[allpoint.size()];
py=new int[allpoint.size()];
for(int i=0;i<allpoint.size();i++){
px[i]=(allpoint.get(i)).x;
py[i]=(allpoint.get(i)).y;
}
g2.setColor(Color.YELLOW);
g2.drawPolyline(px,py,allpoint.size());
}
if(allpoint.size()>0&&mmoved==true){
g2.setColor(Color.YELLOW);
g2.drawLine((allpoint.get(allpoint.size()-1)).x,(allpoint.get(allpoint.size()-1)).y,tempoint.x,tempoint.y);
}
if(allpoint.size()>0&&mclicked==true){
if(allpoint.size()>2&&
tempoint.x<=(allpoint.get(0).x)+5&&
tempoint.x>=(allpoint.get(0).x)-5&&
tempoint.y<=(allpoint.get(0).y)+5&&
tempoint.y>=(allpoint.get(0).y)-5){
(allpoint.get(allpoint.size()-1)).x=allpoint.get(0).x;
(allpoint.get(allpoint.size()-1)).y=allpoint.get(0).y;
g2.drawImage(bufimage,0,0,pmain);
px=new int[allpoint.size()];
py=new int[allpoint.size()];
for(int i=0;i<allpoint.size();i++){
px[i]=(allpoint.get(i)).x;
py[i]=(allpoint.get(i)).y;
}
g2.setColor(Color.ORANGE);
g2.drawPolygon(px,py,allpoint.size());
tempoly=new Polygon(px,py,allpoint.size());
pmain.removeMouseListener(mh);
pmain.removeMouseMotionListener(mh);
}
else{
g2.drawPolyline(px,py,allpoint.size());
mclicked=false;
}
}
}
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getActionCommand()=="Open"){
FileDialog fd=new FileDialog(ImageClipper.this,"Open Image File",FileDialog.LOAD);
fd.setDirectory("C:\\");
fd.setVisible(true);
fname=fd.getDirectory()+fd.getFile();
try{
bufimage=ImageIO.read(new File(fname));
}catch(Exception ex){
}
allpoint.clear();
tempoint=new Point();
mclicked=false;
mmoved=false;
pmain.addMouseListener(mh);
pmain.addMouseMotionListener(mh);
pmain.repaint();
}
if(e.getActionCommand()=="Remove"){
Graphics2D g2=(Graphics2D)pmain.getGraphics();
g2.setBackground(Color.WHITE);
g2.clearRect(0,0,pmain.getWidth(),pmain.getHeight());
g2.setClip(tempoly);
g2.drawImage(bufimage,pmain.getX(),pmain.getY(),pmain);
}
}
}
class MouseHandler implements MouseMotionListener, MouseListener{
public void mouseMoved(MouseEvent e){
if(!allpoint.isEmpty()){
tempoint=e.getPoint();
mmoved=true;
repaint();
}
}
public void mouseDragged(MouseEvent e){
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e){
}
public void mouseReleased(MouseEvent e){
}
public void mousePressed(MouseEvent e){
}
public void mouseClicked(MouseEvent e){
allpoint.add(e.getPoint());
mclicked=true;
repaint();
}
}
public static void main(String[] args){
new ImageClipper();
}
}
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