This program draws a B/W image on the screen. To mimic drawing on a whiteboard, it utilizes
Thread class so that different parts of the image are shown in an orderly manner, based on the input from the user. Two
BufferedImage objects are used here, one for the image and the other for the whiteboard marker.
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203 | import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.*;
public class WhiteboardAnimation extends JFrame{
private JPanel pmain=null;
private BufferedImage bufimage=null;
private int width=0;
private int height=0;
private int pixel[]=null;
private int pixelblack[]=null;
private int pixelposx[]=null;
private int pixelposy[]=null;
private ArrayList<Integer> px=null;
private ArrayList<Integer> py=null;
private boolean bstartclicked=false;
private BufferedImage bufimage2=null;
private int pospenx=0;
private int pospeny=0;
public WhiteboardAnimation(){
super("Whiteboard Animation");
setSize(400,450);
JButton bopen=new JButton("Open");
bopen.addActionListener(new ButtonHandler());
pmain=new PanelDraw();
pmain.setPreferredSize(new Dimension(400,400));
pmain.addMouseListener(new MouseHandler());
pmain.addMouseMotionListener(new MouseHandler());
JButton bstart=new JButton("Start");
bstart.addActionListener(new ButtonHandler());
setLayout(new BorderLayout());
add("North",bopen);
add("Center",pmain);
add("South",bstart);
px=new ArrayList<Integer>();
py=new ArrayList<Integer>();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getActionCommand()=="Open"){
FileDialog fd=new FileDialog(WhiteboardAnimation.this,"Open Image File",FileDialog.LOAD);
fd.setDirectory("C:\\");
fd.setVisible(true);
String directory=fd.getDirectory();
String filename=fd.getFile();
if (filename!= null){
try{
bufimage=ImageIO.read(new File(directory+filename));
}catch(Exception ex){
}
}
width=bufimage.getWidth();
height=bufimage.getHeight();
int counter=0;
int numblack=0;
pixel=new int[width*height];
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
pixel[counter]=bufimage.getRGB(j,i);
if(pixel[counter]!=-1){
numblack++;
}
counter++;
}
}
pixelblack=new int[numblack];
pixelposx=new int[numblack];
pixelposy=new int[numblack];
counter=0;
int counter2=0;
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
//pixel[counter]=bufimage.getRGB(j,i);
if(pixel[counter]!=-1){
pixelblack[counter2]=pixel[counter];
pixelposx[counter2]=j;
pixelposy[counter2]=i;
counter2++;
}
counter++;
}
}
repaint();
}
if(e.getActionCommand()=="Start"){
bstartclicked=true;
try{
bufimage2=ImageIO.read(new File("marker.png"));
}catch(Exception ex){
}
Thread t=new Thread(new WBMarker());
t.start();
}
}
}
class WBMarker implements Runnable{
public WBMarker(){
try{
bufimage=ImageIO.read(new File("blank.png"));
}catch(Exception e){
}
repaint();
}
public void run(){
if(!px.isEmpty()){
for(int i=0;i<px.size();i++){
for(int j=0;j<pixelblack.length;j++){
if(pixelposx[j]<=px.get(i)+10&&pixelposy[j]<=py.get(i)+10&&
pixelposx[j]>=px.get(i)-10&&pixelposy[j]>=py.get(i)-10){
bufimage.setRGB(pixelposx[j],pixelposy[j],pixelblack[j]);
pospenx=pixelposx[j];
pospeny=pixelposy[j];
pmain.repaint();
try{
Thread.currentThread().sleep(1);
}catch(Exception ex){
}
}
}
}
}
}
}
class PanelDraw extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
if(bufimage!=null){
g2.drawImage(bufimage,0,0,null);
if(!px.isEmpty()&&bstartclicked==false){
for(int i=0;i<px.size();i++){
g2.drawOval(px.get(i)-10,py.get(i)-10,20,20);
}
}
}
if(bufimage2!=null){
g2.drawImage(bufimage2,pospenx,pospeny-50,null);
}
}
}
class MouseHandler implements MouseMotionListener, MouseListener{
public void mouseMoved(MouseEvent e){
}
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){
int order=px.size();
//System.out.println(order);
px.add(order,e.getX());
py.add(order,e.getY());
repaint();
}
}
public static void main(String[] args){
new WhiteboardAnimation();
}
}
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