This small drawing app lets the user to create freehand drawings. It works by detecting both mouse events and mouse-motion events. Drawing a point is accomplished by utilizing the
drawLine() method.
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212 | import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.Border;
public class DrawingApp extends JFrame{
private JPanel pmain=null;
private JPanel pright=null;
private JLabel lmain=null;
private BufferedImage bufimage=null;
private Point pstart=null;
private Point pend=null;
private JLabel lpen=null;
private JLabel lerase=null;
private boolean penpicked=false;
private boolean erasepicked=false;
private JLabel lcolor[]=null;
private Color cpicked=null;
public DrawingApp(){
super("Free Drawing");
setSize(500,450);
pmain=new PanelDraw();
pmain.addMouseListener(new MouseHandler());
pmain.addMouseMotionListener(new MouseHandler());
BufferedImage bufimagetemp=null;
try{
bufimagetemp=ImageIO.read(new File("pencil.jpg"));
}catch(Exception e){
}
ImageIcon icon=new ImageIcon(bufimagetemp);
lpen=new JLabel();
lpen.setIcon(icon);
lpen.setBorder(BorderFactory.createLineBorder(Color.black));
lpen.addMouseListener(new MouseHandler());
try{
bufimagetemp=ImageIO.read(new File("eraser.jpg"));
}catch(Exception e){
}
icon=new ImageIcon(bufimagetemp);
lerase=new JLabel();
lerase.setIcon(icon);
lerase.setBorder(BorderFactory.createLineBorder(Color.black));
lerase.addMouseListener(new MouseHandler());
try{
bufimagetemp=ImageIO.read(new File("black.jpg"));
}catch(Exception e){
}
icon=new ImageIcon(bufimagetemp);
lcolor=new JLabel[4];
lcolor[0]=new JLabel();
lcolor[0].setIcon(icon);
lcolor[0].setBorder(BorderFactory.createLineBorder(Color.black));
lcolor[0].addMouseListener(new MouseHandler());
try{
bufimagetemp=ImageIO.read(new File("red.jpg"));
}catch(Exception e){
}
icon=new ImageIcon(bufimagetemp);
lcolor[1]=new JLabel();
lcolor[1].setIcon(icon);
lcolor[1].setBorder(BorderFactory.createLineBorder(Color.black));
lcolor[1].addMouseListener(new MouseHandler());
try{
bufimagetemp=ImageIO.read(new File("green.jpg"));
}catch(Exception e){
}
icon=new ImageIcon(bufimagetemp);
lcolor[2]=new JLabel();
lcolor[2].setIcon(icon);
lcolor[2].setBorder(BorderFactory.createLineBorder(Color.black));
lcolor[2].addMouseListener(new MouseHandler());
try{
bufimagetemp=ImageIO.read(new File("blue.jpg"));
}catch(Exception e){
}
icon=new ImageIcon(bufimagetemp);
lcolor[3]=new JLabel();
lcolor[3].setIcon(icon);
lcolor[3].setBorder(BorderFactory.createLineBorder(Color.black));
lcolor[3].addMouseListener(new MouseHandler());
pright=new JPanel();
pright.setLayout(new GridBagLayout());
GridBagConstraints gbc=new GridBagConstraints();
gbc.gridx=0;
gbc.gridy=0;
gbc.insets=new Insets(5,5,0,5);
gbc.fill=GridBagConstraints.HORIZONTAL;
pright.add(lpen,gbc);
gbc.gridy=1;
pright.add(lerase,gbc);
gbc.gridy=2;
pright.add(lcolor[0],gbc);
gbc.gridy=3;
pright.add(lcolor[1],gbc);
gbc.gridy=4;
pright.add(lcolor[2],gbc);
gbc.gridy=5;
pright.add(lcolor[3],gbc);
setLayout(new BorderLayout());
add("Center",pmain);
add("East",pright);
try{
bufimage=ImageIO.read(new File("blank.png"));
}catch(Exception e){
}
lmain=new JLabel();
lmain.setIcon(new ImageIcon(bufimage));
pmain.add(lmain);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
}
class PanelDraw extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
g=bufimage.getGraphics();
if(pstart!=null&&pend!=null&&penpicked==true){
if(cpicked==null){
g.setColor(Color.BLACK);
}
else{
g.setColor(cpicked);
}
g.drawLine(pstart.x,pstart.y,pend.x,pend.y);
pstart.x=pend.x;
pstart.y=pend.y;
}
if(pstart!=null&&erasepicked==true){
g.setColor(Color.WHITE);
g.fillRect(pstart.x,pstart.y,10,10);
pstart.x=pend.x;
pstart.y=pend.y;
}
}
}
class MouseHandler implements MouseMotionListener, MouseListener{
public void mouseMoved(MouseEvent e){
}
public void mouseDragged(MouseEvent e){
pend = e.getPoint();
repaint();
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e){
}
public void mouseReleased(MouseEvent e){
pstart=null;
pend=null;
repaint();
}
public void mousePressed(MouseEvent e){
pstart=e.getPoint();
}
public void mouseClicked(MouseEvent e){
if(e.getSource()==lpen){
penpicked=true;
erasepicked=false;
}
if(e.getSource()==lerase){
erasepicked=true;
penpicked=false;
}
if(e.getSource()==lcolor[0]){
cpicked=Color.BLACK;
}
if(e.getSource()==lcolor[1]){
cpicked=Color.RED;
}
if(e.getSource()==lcolor[2]){
cpicked=Color.GREEN;
}
if(e.getSource()==lcolor[3]){
cpicked=Color.BLUE;
}
}
}
public static void main(String[] args){
new DrawingApp();
}
}
|
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