I am a beginner. I am trying to add filled rectangle or any other graphic on JFrame using multiple inner classes. I am getting debugging errors. What are the problems here?. If this is a wrong way. Please tell me how to do the same using JFrame and JPanel only.
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
public class RainBow{
JFrame frame;
public static void main(String[] args){
RainBow bow = new RainBow();
bow.go();
}
public class Paint extends JPanel{
public void paintComponent(Graphics g){
g.setColor(Color.red);
g.fillRect(100, 100, 100, 100);
}
}
public void go(){
frame.addMouseListener(new ListenMouse());
frame.setSize(400, 400);
frame.setVisible(true);
}
public class ListenMouse implements MouseListener{
public void mosueClicked(MouseEvent a){
Paint p = new Paint();
frame.getContentPane().add(p);
frame.setVisible(true);
}
#Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
}
}
The code posted has multiple problems. See this working example with explanations in comments.
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class RainBow {
JFrame frame;
boolean paintRectangle = false;
public static void main(String[] args) {
RainBow bow = new RainBow();
bow.go();
}
public class Paint extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g); // should always be done
if (paintRectangle) {
g.setColor(Color.red);
g.fillRect(100, 100, 100, 100);
}
}
}
public void go() {
frame = new JFrame(); // otherwise NPE
Paint paint = new Paint();
paint.addMouseListener(new ListenMouse()); // add listner to paint
frame.add(paint); // add paint at start-up
frame.setSize(400, 400);
frame.setVisible(true);
// ensures JVM shuts down when frame is closed.
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
public class ListenMouse extends MouseAdapter {
// this method is incorrectly spelled!
public void mosueClicked(MouseEvent a) {
}
#Override
public void mouseClicked(MouseEvent arg0) {
/* requires special handling to add components on the fly */
//Paint p = new Paint();
paintRectangle = true;
frame.repaint(); // forces the Paint to be painted as well.
}
}
}
Related
I am trying to make a simple game in Java in which many things are moving. I watched a video on moving graphics that said that I need a Timer() to move something on the screen. When I try to make a timer in the form of Timer t = new Timer(5, this); it won't work. It tells me that there should not be any parameters for the method Timer(). Can I please have some help? By the way, I have only been coding java for 2 weeks, so I am very much a beginner. Here is my code:
package FlappyDodgeGame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
public class Game extends JFrame implements ActionListener{
static int width = 1000, height = width * 9 / 12;
public static int birdX = width * 1 / 5, birdY = height / 2, birdSize = 75;
public static double birdVel = 0, birdVelDelta = 0.1;
//error: The constructor Timer(int, Game) is undefined. quick fix: Remove arguments to match 'Timer()'.
Timer timer = new Timer(5, this);
public static void main(String args[]){
final JFrame jframe = new JFrame("Test");
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setSize(width, height);
jframe.setResizable(false);
jframe.setVisible(true);
jframe.setLocationRelativeTo(null);
final GUI gui = new GUI();
jframe.add(gui);
jframe.addMouseListener(new MouseListener(){
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
});
}
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
}
You're using the wrong Timer class:
import java.util.Timer;
There's another Timer class, javax.swing.Timer, that has a two-arg constructor. The javadoc for this class is here.
For a Swing application, the big advantage of using a javax.swing.Timer instead of a java.util.Timer is that when the Swing timer calls your listener, it does so on the Swing event thread, which means you can immediately call methods on all your UI objects.
if you want to move something on screen, you need to use a class that extends JPanel, and then implement paintComponent(Graphics g)
class Game extends JPanel{
private int x_axis = 0;
private int y_axis = 0;
protected void paintComponent(Graphics g) {
super.paintComponent(g);
// do your painting here
//e.g.
g.drawOval(x_axis, y_axis, 200, 150);
x_axis++;
y_axis++;
//
repaint();
}
}
after that you can add it to your JFrame
frame.add(new Game());
Well my English is not so good but i will try to explain.
I was make two class,First Class and Second Class(Second was named "Grafika").
I want that my rectangle move to position where i was clicked , but obviously he dont move and i cant understand why, please help .
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.*;
public class Grafika extends JPanel implements MouseListener{
static int x=0,y=0;
#Override
public void paintComponent(Graphics g){
g.setColor(Color.BLACK);
g.fillRect(x, y, 20, 30);
}
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub``
x=arg0.getX();
y=arg0.getY();
this.repaint(x, y, 20, 30);
}
i will show you a full code, it was small .This was second class.And my(i think) only problem is repaint() method . Why i dont know :D .
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.*;
public class Grafika extends JPanel implements MouseListener{
static int x=0,y=0;
#Override
public void paintComponent(Graphics g){
g.setColor(Color.BLACK);
g.fillRect(x, y, 20, 30);
}
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
x=arg0.getX();
y=arg0.getY();
this.repaint(x, y, 20, 30);
}
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
}
Now i will show you first class from where i was calling second class.
import java.awt.*;
import javax.swing.*;
public class Glavna extends Grafika {
/**
* #param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Grafika g=new Grafika();
JFrame wi=new JFrame("Grafika");
wi.setBounds(50, 50, 500, 600);
wi.add(g);
wi.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
wi.setVisible(true);
}
}
You've several problems in that code:
You're sort of creating a MouseListener (you're still missing several of the interface's methods), but I don't see anywhere that you've added it to your GUI. You must somewhere have addMouseListener(this); in your code for the listener to work.
Repaint by itself doesn't move the rectangle. Changing the X and Y does, but again, not without adding the MouseListener first.
You probably want to call repaint(); without parameters to paint the whole component. Otherwise the old rectangle might not get erased.
Your paintComponent method should call the super.paintComponent(g); as the first method call of your override method. Without this you won't erase the old rectangle, and you break the painting chain which could have painting side effects in child components.
For example:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
public class Grafika extends JPanel {
private static final int RECT_W = 20;
private static final int RECT_H = 30;
private static final int PREF_W = 600;
private static final int PREF_H = PREF_W;
private static final Color MY_COLOR = Color.RED;
private int myX = 0;
private int myY = 0;
public Grafika() {
MyMouse myMouse = new MyMouse();
addMouseListener(myMouse); // add MouseListener
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g); // **MUST** call this
g.setColor(MY_COLOR);
g.fillRect(myX, myY, RECT_W, RECT_H);
}
private class MyMouse extends MouseAdapter {
public void mousePressed(MouseEvent e) {
myX = e.getX();
myY = e.getY();
repaint(); // repaint the whole JPanel
}
}
#Override // to make the GUI larger
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private static void createAndShowGui() {
Grafika mainPanel = new Grafika();
JFrame frame = new JFrame("Grafika");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
If you want to get fancier and start dragging the square around:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
#SuppressWarnings("serial")
public class Grafika extends JPanel {
private static final int RECT_W = 20;
private static final int RECT_H = RECT_W;
private static final int PREF_W = 600;
private static final int PREF_H = PREF_W;
private static final Color MY_COLOR = Color.RED;
private int myX = 0;
private int myY = 0;
public Grafika() {
MyMouse myMouse = new MyMouse();
addMouseListener(myMouse);
addMouseMotionListener(myMouse);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(MY_COLOR);
g.fillRect(myX, myY, RECT_W, RECT_H);
}
private class MyMouse extends MouseAdapter {
public void mousePressed(MouseEvent e) {
moveRect(e);
}
#Override
public void mouseDragged(MouseEvent e) {
moveRect(e);
}
#Override
public void mouseReleased(MouseEvent e) {
moveRect(e);
}
private void moveRect(MouseEvent e) {
myX = e.getX() - RECT_W / 2;
myY = e.getY() - RECT_H / 2;
repaint();
}
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private static void createAndShowGui() {
Grafika mainPanel = new Grafika();
JFrame frame = new JFrame("Grafika");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
you have to add mouse listener to component porobably
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.*;
public class Grafika extends JPanel implements MouseListener{
static int x=0,y=0;
public Grafika(){
super();
addMouseListener(this); // add to constructor
}
#Override
public void paintComponent(Graphics g){
g.setColor(Color.BLACK);
g.fillRect(x, y, 20, 30);
}
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub``
x=arg0.getX();
y=arg0.getY();
this.repaint(x, y, 20, 30);
}
At university we started Java programming and got the task to write a program that draws a vertical and a horizontal line at the location where the mouse currently is. Also we should add a Label that shows the coordinates of the mouse. I got the drawing thing working but when I try to add a label, it won't show up? I started with a test-label, but even that isn't shown inside the frame. Can someone help me?
public class Coordinates extends JPanel implements MouseListener, MouseMotionListener {
private Point currentPoint = new Point(-50, -50);
public Coordinates(){
addMouseListener(this);
addMouseMotionListener(this);
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.blue);
g.drawLine(currentPoint.x, currentPoint.y+1000, currentPoint.x, currentPoint.y-1000);
g.drawLine(currentPoint.x+1000, currentPoint.y, currentPoint.x-1000, currentPoint.y);
}
public void mousePressed(MouseEvent e){
currentPoint = e.getPoint();
repaint();
};
static JLabel label = new JLabel();
public static void main(String[] args) {
JFrame frame = new JFrame("Koordinaten");
frame.setSize(600, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.add(label);
JComponent newContentPane = new Coordinaten();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
}
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
label.setText(currentPoint.toString());
currentPoint = e.getPoint();
repaint();
}
}
Do all your painting within the JPanel's paintComponent method not the paint method, and be sure to call the super's paintComponent method within your override, usually at the start of the override method.
You need to add a JLabel to your JPanel to have it display anything. Your code does not do this. And then in the MouseMotionListener, set the JLabel's text with the mouse coordinates.
For example:
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
#SuppressWarnings("serial")
public class DrawPanel extends JPanel {
private static final int PREF_W = 600;
private static final int PREF_H = PREF_W;
private JLabel locationLabel = new JLabel();
public DrawPanel() {
add(locationLabel);
addMouseMotionListener(new MyMouseAdapter());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g); // this allows JPanel to do housekeeping painting first
// do drawing here!
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class MyMouseAdapter extends MouseAdapter {
#Override
public void mouseMoved(MouseEvent e) {
// get Point location and turn into a String
String location = String.format("[%d, %d]", e.getX(), e.getY());
// set the label's text with this String
locationLabel.setText(location);
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("DrawPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new DrawPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
With the cross-hairs:
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
#SuppressWarnings("serial")
public class DrawPanel extends JPanel {
private static final int PREF_W = 600;
private static final int PREF_H = PREF_W;
private JLabel locationLabel = new JLabel();
private int mouseX = 0;
private int mouseY = 0;
public DrawPanel() {
add(locationLabel);
addMouseMotionListener(new MyMouseAdapter());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g); // this allows JPanel to do housekeeping
// painting first
// do drawing here!
g.drawLine(0, mouseY, getWidth(), mouseY);
g.drawLine(mouseX, 0, mouseX, getHeight());
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class MyMouseAdapter extends MouseAdapter {
#Override
public void mouseMoved(MouseEvent e) {
mouseX = e.getX();
mouseY = e.getY();
// get Point location and turn into a String
String location = String.format("[%d, %d]", mouseX, mouseY);
// set the label's text with this String
locationLabel.setText(location);
repaint();
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("DrawPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new DrawPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
Basically, a JLabel is made like this, defined outside of the main method:
static JLabel label = new JLabel();
In your main method
frame.add(label);
And in your mouseMoved method you would put this:
label.setText(currentPoint.toString());
I am currently writing a small program where I'm supposed to use basic transformations. Right now, I'm working on being able to move the polygon by using the arrow keys. Right now I can move it to the right by pressing the mouse, but I'd rather be able to use the right arrow key. However, I haven't been able to no matter which method I tried.
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
class PolygonPanel extends JPanel implements MouseListener{
Polygon p;
public PolygonPanel(){
p = new Polygon();
p.addPoint(10, 10);
p.addPoint(100,50);
p.addPoint(50,100);
addMouseListener(this);
addKeyListener(new MKeyListener());
}
class MKeyListener extends KeyAdapter{
public void keyPressed(KeyEvent e){
int keyCode = e.getKeyCode();
if(keyCode==e.VK_RIGHT){
System.out.println("FFFFUUUUU");
}
}
}
public void paintComponent(Graphics g){
super.paintComponent(g);
setBackground(Color.white);
g.fillPolygon(p);
}
#Override
public void mouseClicked(MouseEvent arg0) {
System.out.println("hei");
for (int i = 0; i < p.npoints; i++) {
p.xpoints[i] = p.xpoints[i]+10;
repaint();
}
}
#Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
}
class PolygonFrame extends JFrame{
public PolygonFrame(){
setTitle("Polygoner");
setSize(700, 600);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
Container contentPane = getContentPane();
contentPane.add(new PolygonPanel());
}
}
public class Polygonfun {
public static void main(String[] args) {
JFrame frame = new PolygonFrame();
frame.setVisible(true);
}
}
Nothing happens when I press the right arrow key. I also tried implementing it like this:
class PolygonPanel extends JPanel implements MouseListener,KeyAdapter
And then adding the unimplemented methods, but that didn't work either. I know i've probably overlooked something, but I cant seem to figure it out. Any advice?
Thanks
set this.setFocusable(true); for your panel.
Should be:
public PolygonPanel(){
p = new Polygon();
p.addPoint(10, 10);
p.addPoint(100,50);
p.addPoint(50,100);
addMouseListener(this);
this.setFocusable(true);
this.addKeyListener(new MKeyListener());
}
may i know if there is any formula for drawing lines? currently i am implementing a freehand draw line in java, however the code below when drawn it is not what im expecting.
i have tried g.drawLine(arg0.getX(), arg0.getY(), arg0.getX(), arg0.getY()); , however the line drawn is not continous rather it is drawing points, i read that it is because the mouse drag happens at intervals, if so how should i record the points?
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JPanel;
public class STDrawingArea extends JPanel implements MouseListener, MouseMotionListener {
/**
*
*/
private static final long serialVersionUID = 1L;
int xPressed,yPressed;
int xReleased,yReleased;
int xDragged,yDragged;
public STDrawingArea()
{
setPreferredSize(new Dimension(1280, 700));
setBounds(0, 0, 1280, 700);
setBackground(Color.WHITE);
addMouseListener(this);
addMouseMotionListener(this);
}
#Override
public void mouseDragged(MouseEvent arg0) {
Graphics g = getGraphics();
xDragged = xPressed;
yDragged = yPressed;
g.drawLine(xPressed, yPressed, arg0.getX(), arg0.getY());
xDragged = arg0.getX();
yDragged = arg0.getY();
}
#Override
public void mouseMoved(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
xPressed = arg0.getX();
yPressed = arg0.getY();
System.out.println("xPressed: "+xPressed+" ,yPressed: "+yPressed);
}
#Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
xReleased = arg0.getX();
yReleased = arg0.getY();
System.out.println("xReleased: "+xPressed+" ,yReleased: "+yPressed);
}
}
A simple way to do this might be:
Maintain a List of Points in your component
In the mouseDragged() method, get the point (MouseEvent#getPoint()) and add it to your list
Override the paintComponent() method of the JPanel
Iterate over all points in your list of points
Draw lines between each pair of points (except the first and last, of course)
For example, you might make the following changes:
private ArrayList<Point> points = new ArrayList<Point>();
//...
public void mouseDragged(MouseEvent arg0) {
points.add(arg0.getPoint());
repaint(); //request Swing to refresh display as soon as it can
}
//...
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
for (int i = 0; i < points.size() - 2; i++)
{
Point p1 = points.get(i);
Point p2 = points.get(i + 1);
g.drawLine(p1.x, p1.y, p2.x, p2.y);
}
}
Some slight Changes are required
#Override
public void mouseDragged(MouseEvent arg0) {
Graphics g = getGraphics();
g.drawLine(xDragged, yDragged, arg0.getX(), arg0.getY());
xDragged = arg0.getX();
yDragged = arg0.getY();
}
and
#Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
xPressed = arg0.getX();
yPressed = arg0.getY();
System.out.println("xPressed: "+xPressed+" ,yPressed: "+yPressed);
xDragged=xPressed;
yDragged=yPressed;
}
I have compiled and executed this code and found its perfectly working..:-)
Try This. It's working. There is no need to use the Point class and iterate the 'for' loop, If you wanna simply make a Freehand Drawing.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
class STDrawingArea extends JPanel implements MouseListener,MouseMotionListener,ActionListener
{
int xPressed,yPressed;
int xReleased,yReleased;
int xDragged,yDragged;
private JButton clear;
public STDrawingArea()
{
setPreferredSize(new Dimension(1200, 500));
setBounds(0, 0, 480, 500);
//setBackground(Color.YELLOW);
clear=new JButton("CLEAR");
add(clear);
clear.setBounds(540, 5, 100, 25);
clear.addActionListener(this);
addMouseListener(this);
addMouseMotionListener(this);
}
#Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==clear)
{
setOpaque(false);
repaint();
}
}
#Override
protected void paintComponent(Graphics g)
{
g.drawLine(xPressed,yPressed,xDragged,yDragged);
xPressed=xDragged;
yPressed=yDragged;
}
#Override
public void mouseDragged(MouseEvent arg0) {
Graphics g = getGraphics();
g.drawLine(xPressed, yPressed, arg0.getX(), arg0.getY());
xDragged = arg0.getX();
yDragged = arg0.getY();
repaint();
}
#Override
public void mouseMoved(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
#Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
setOpaque(true);
xPressed = arg0.getX();
yPressed = arg0.getY();
}
#Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
}
class Frame4 extends JFrame
{
private STDrawingArea da;
public Frame4()
{
da=new STDrawingArea();
da.setBackground(Color.YELLOW);
da.setLayout(new BorderLayout());
add(da);
}
}
public class FreeHandDrwing
{
public static void main(String s[])
{
Frame4 ob=new Frame4();
ob.setVisible(true);
ob.setBounds(100, 100, 1200, 500);
ob.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}