Help in drawing graphics.
Hi friends,
I'm newbie in drawing graphics with Java, and I need some help in a specific part of my program.
What I want to do is to draw a waveform of a sound file. That waveform is built based on the amplitude of each sound sample. So I have a big vector full of those amplitudes. Now what I need to do is plot each point on the screen. The x coordinate of the point will be its time position in the time axis. The y coordinate of the point will be the amplitude value. Ok... Now I have a lot of doubts...
1 - can someone give me a simple example on how to plot points in a java app? I know I have to extend a JPainel class, but I don't know much about those paint, and repaint methods. It's all weird to me. I already searched through the tutorial and the web, but I couldn't see a simple, good example. Can someone hand me this?
2 - Once I know how to draw those graphics, I need to find a way to put a button, or anything like that, in my app, so the user can press that button to see to next part of the waveform, since the wave is BIG, and doesn't fit entirely on the screen. Is this button idea ok? Can I use some sort of SCROLL on it, would it be better?
Well... I'm trying to learn it all. ANY help will be appreciated, ANY good link, little hint, first step, anything.
Thanks for all, in advance.
Leonardo
(Brazil)
This will lead you, in this sample you have a panel and a button,
every click will fill a vector with random 700 points and draw them on the panel,
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Wave extends Frame implements ActionListener
WPanel pan = new WPanel();
Vector points = new Vector();
Button go = new Button("Go");
Panel cont = new Panel();
public Wave()
super();
setBounds(6,6,700,400);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent ev)
dispose();
System.exit(0);
add("Center",pan);
go.addActionListener(this);
cont.add(go);
add("South",cont);
setVisible(true);
public void actionPerformed(ActionEvent a)
points.removeAllElements();
for (int j=0; j < 700; j++)
int y = (int)(Math.random()*350);
points.add(new Point(j,y+1));
pan.draw(points);
public class WPanel extends Panel
Vector points;
public WPanel()
setBackground(Color.pink);
public void draw(Vector points)
this.points = points;
repaint();
public void paint(Graphics g)
super.paint(g);
if (points == null) return;
for (int j=1; j < points.size(); j++)
Point p1 = (Point)points.get(j-1);
Point p2 = (Point)points.get(j);
g.drawLine(p1.x,p1.y,p2.x,p2.y);
public static void main (String[] args)
new Wave();
Noah
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g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.BLACK);
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g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.setColor(Color.BLACK);
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g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
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g.fillPolygon(poly5);
g.setColor(Color.black);
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g.drawString("D",268,302);
g.setColor(Color.black);
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g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
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g.setColor(Color.black);
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public void redraw(int sequence) {
this.sequence = sequence;
repaint();
}TEST CONTROL
* TestControl.java
* Created on 28 February 2005, 11:16
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.JFrame;
* @author Kripa Bhojwani
public class TestControl extends Panel implements ActionListener {
TestView view;
int sequence; // event sequence
// constructor
public TestControl(TestView view) {
Button b = null;
Label label = new Label("A^2 ");
this.view = view; // initialize drawble area
sequence = 0; // initialize sequence
b = new Button("Prev");
b.addActionListener(this);
add(b);
b = new Button("Next");
b.addActionListener(this);
add(b);
add(label);
// exported method
public void actionPerformed(ActionEvent ev) {
String label = ev.getActionCommand();
if (label.equals("Prev")) {
if (sequence >0) {
--sequence;
else {
if (sequence < 15) {
++sequence;
this.setEnabled(false); // disable the controls
view.redraw(sequence);
this.setEnabled(true); // enable the controls
}Please help --- really need to sort this out...
THANKSOne of the problems you face is that it is hard to recognise which parts of your code are drawing the triangle. This is because you are writing code in a procedural way rather than an object oriented way.
In object oriented code you would have a triangle object that could draw itself. You would create the triangle object by specifying its sizes and angles in some way. Then it should be easy to change the triangles sizes and angles and ask all the drawn objects to redraw themselves. -
I need help to draw an image and move it plz plz : )
Ok, so I have this whole code and I understand most of it but not all of it but I'm trying to make image "drop.gif" to move down the right side of the window. For each shot that is taken the image moves down ever so much and if the image hits the Entity ship "background" than notify death. PLease anyone help me !
there are 7 classes but here is the main ...
package spaceinvaderss;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferStrategy;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main extends Canvas {
/*A Canvas component represents a blank rectangular area of the screen onto which the application can draw or from which the application can trap input events from the user.
An application must subclass the Canvas class in order to get useful functionality such as creating a custom component.
The paint method must be overridden in order to perform custom graphics on the canvas.*/
/** The stragey that allows us to use accelerate page flipping.*/
private BufferStrategy strategy;
/** True if the game is currently "running", i.e. the game loop is looping */
private boolean gameRunning = true;
/** The list of all the entities that exist in our game */
private ArrayList entities = new ArrayList();
/** The list of entities that need to be removed from the game this loop */
private ArrayList removeList = new ArrayList();
/** The entity representing the player */
private Entity ship;
/** The entity representing the alien */
private Entity alien;
/** The speed at which the player's ship should move (pixels/sec) */
private double moveSpeed = 600;
/** The time at which last fired a shot */
private long lastFire = 0;
/** The interval between our players shot (ms) */
private long firingInterval = 400;
/** timer */
private long time = 0;
/** The number of aliens left on the screen */
private int alienCount;
/** The message to display which waiting for a key press */
private String message = "";
/** True if we're holding up game play until a key has been pressed */
private boolean waitingForKeyPress = true;
/** True if the left cursor key is currently pressed */
private boolean leftPressed = false;
/** True if the right cursor key is currently pressed */
private boolean rightPressed = false;
/** True if we are firing */
private boolean firePressed = false;
/** True if game logic needs to be applied this loop, normally as a result of a game event */
private boolean logicRequiredThisLoop = false;
private static Image drop;
/** The constant for the width*/
private int DOMAIN = 800;
/** The constant fot the length*/
private int RANGE = 950;
/** The constant for the number of rows of aliens */
private int numbaofrows = 8;
/** The constant for the number of aliens per row */
private int aliensperrow = 12;
/** The constant for the percent of which the speed increases*/
private double speedincrease = 1.02;
/** Starts the variable that counts the shots*/
private int shotsfired = 0;
/** Construct our game and set it running.*/
public Main() {
// Creates a frame to contain Main.
JFrame container = new JFrame("SPACE INVADERS !!! WOOT !!! WOOT !!!");
// Gets a hold of the content of the frame and sets up the resolution of the game
// Names the inside of the "container" as panel.
JPanel panel = (JPanel) container.getContentPane();
// Stes the demensions of the panel.
panel.setPreferredSize(new Dimension(DOMAIN,RANGE));
//Sets the layout as nothing which overrides any automatic properties.
panel.setLayout(null);
// Sets up our canvas size and puts it into the content of the frame
setBounds(0, 0, DOMAIN, RANGE);
panel.add(this);
// Tell AWT not to bother repainting our canvas since we're
// going to do that our self in accelerated mode.
setIgnoreRepaint(true);
// Actually sizes the window approximately.
container.pack();
// Makes it so that the window can't be resized.
container.setResizable(false);
// Makes the window visible.
container.setVisible(true);
// Add a listener to respond to the user pressing the x.
// End the program when the window is closed.
container.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
// add a key input system (defined below) to our canvas
// so we can respond to key pressed
addKeyListener(new KeyInputHandler());
// request the focus so key events come to us
requestFocus();
// Create the buffering strategy which will allow AWT
// to manage our accelerated graphics.
createBufferStrategy(2);
strategy = getBufferStrategy();
// initialise the entities in our game so there's something
// to see at startup
initEntities();
time = System.currentTimeMillis();
* Start a fresh game, this should clear out any old data and
* create a new set.
private void startGame() {
// clear out any existing entities and intialise a new set
entities.clear();
initEntities();
// blank out any keyboard settings we might currently have
leftPressed = false;
rightPressed = false;
firePressed = false;
* Initialise the starting state of the entities (ship and aliens). Each
* entitiy will be added to the overall list of entities in the game.
private void initEntities() {
ClassLoader cloader = Main.class.getClassLoader();
drop = Toolkit.getDefaultToolkit().getImage(cloader.getResource("drop.gif"));
prepareImage(drop, this);
// create the player ship and place it in the center of the screen
ship = new ShipEntity(this,"background.gif", 0, (RANGE - 75));
entities.add(ship);
ship = new ShipEntity(this,"ship.gif", (DOMAIN / 2) - 0, (RANGE - 50));
entities.add(ship);
// create a block of aliens
alienCount = 0;
for (int row = 0; row < numbaofrows; row++) {
for (int x = 0; x < aliensperrow; x++) {
alien = new AlienEntity(this,"alien.gif", 100 + (x*50),(50)+row*30);
entities.add(alien);
alienCount++;
* Notification from a game entity that the logic of the game
* should be run at the next opportunity (normally as a result of some
* game event)
public void updateLogic() {
logicRequiredThisLoop = true;
* Remove an entity from the game. The entity removed will
* no longer move or be drawn.
* Remove the entity
public void removeEntity(Entity entity) {
removeList.add(entity);
/**Notify that the player has died.*/
public void notifyDeath() {
message = "Oh no! The aliens win, wanna try again?";
waitingForKeyPress = true;
/** Notification that the player has won since all the aliensare dead.*/
public void notifyWin() {
long time2;
time2 = (System.currentTimeMillis() - time) / 1000;
int acuracy = 1000*(aliensperrow*numbaofrows)/shotsfired;
message = "Congradulations! You win! Your time was: " + time2 + " seconds. Your acuracy was " + acuracy + "%.";
waitingForKeyPress = true;
/**Notification that an alien has been killed*/
public void notifyAlienKilled() {
// reduce the alient count, if there are none left, the player has won!
alienCount--;
if (alienCount == 0) {
notifyWin();
// if there are still some aliens left then they all need to get faster, so
// speed up all the existing aliens
for (int i = 0; i < entities.size(); i++) {
Entity entity = (Entity) entities.get(i);
if (entity instanceof AlienEntity) {
// speed up every time the aliens move down
entity.setHorizontalMovement(entity.getHorizontalMovement() * speedincrease);
/**Attempt to fire a shot from the player. Its called "try" since we must first
* check that the player can fire at this point, i.e. has he/she waited long
* enough between shots.*/
public void tryToFire() {
// check that we have been waiting long enough to fire
if (System.currentTimeMillis() - lastFire < firingInterval) {
return;
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntity shot = new ShotEntity(this, "bullet.gif", ship.getX() + 27, ship.getY() - 30);
entities.add(shot);
* The main game loop. This loop is running during all game
* play as is responsible for the following activities:
* - Working out the speed of the game loop to update moves
* - Moving the game entities
* - Drawing the screen contents (entities, text)
* - Updating game events
* - Checking Input
public void gameLoop() {
long lastLoopTime = System.currentTimeMillis();
// Keep looping around till the game ends.
while (gameRunning) {
// Work out how long its been since the last update, this
// will be used to calculate how far the entities should
// move this loop.
long delta = System.currentTimeMillis() - lastLoopTime;
lastLoopTime = System.currentTimeMillis();
// Get hold of a graphics context for the accelerated
// surface and black it out.
Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
g.setColor(Color.black);
g.fillRect(0, 0, DOMAIN, RANGE);
// Cycle around asking for each entity to move itself.
if (!waitingForKeyPress) {
for (int i = 0; i < entities.size(); i++) {
Entity entity = (Entity) entities.get(i);
entity.move(delta);
// cycle round drawing all the entities we have in the game
for (int i = 0; i < entities.size(); i++) {
Entity entity = (Entity) entities.get(i);
entity.draw(g);
// brute force collisions, compare every entity against
// every other entity. If any of them collide notify
// both entities that the collision has occured
for (int p = 0; p < entities.size(); p++) {
for (int s = p + 1; s < entities.size(); s++) {
Entity me = (Entity) entities.get(p);
Entity him = (Entity) entities.get(s);
if (me.collidesWith(him)) {
me.collidedWith(him);
him.collidedWith(me);
// remove any entity that has been marked for clear up
entities.removeAll(removeList);
removeList.clear();
// if a game event has indicated that game logic should
// be resolved, cycle round every entity requesting that
// their personal logic should be considered.
if (logicRequiredThisLoop) {
for (int i = 0; i < entities.size(); i++) {
Entity entity = (Entity) entities.get(i);
entity.doLogic();
logicRequiredThisLoop = false;
// if we're waiting for an "any key" press then draw the
// current message
if (waitingForKeyPress) {
g.setColor(Color.green);
g.drawString(message,(DOMAIN-g.getFontMetrics().stringWidth(message)) / 2, 250);
g.drawString("TO PLAY, PRESS ANY KEY : )", (DOMAIN-g.getFontMetrics().stringWidth("TO PLAY, PRESS ANY KEY : )")) / 2, 40);
// Clear up the graphics.
g.dispose();
// Flip the buffer over.
strategy.show();
// resolve the movement of the ship. First assume the ship
// isn't moving. If either cursor key is pressed then
// update the movement appropraitely
ship.setHorizontalMovement(0);
if ((leftPressed) && (!rightPressed)) {
ship.setHorizontalMovement(-moveSpeed);
} else if ((rightPressed) && (!leftPressed)) {
ship.setHorizontalMovement(moveSpeed);
// if we're pressing fire, attempt to fire
if (firePressed) {
shotsfired++;
tryToFire();
// finally pause for a bit. Note: this should run us at about
// 100 fps but on windows this might vary each loop due to
// a bad implementation of timer
try { Thread.sleep(10); } catch (Exception e) {}
* A class to handle keyboard input from the user. The class
* handles both dynamic input during game play, i.e. left/right
* and shoot, and more static type input (i.e. press any key to
* continue)
* This has been implemented as an inner class more through
* habbit then anything else. Its perfectly normal to implement
* this as seperate class if slight less convienient.
private class KeyInputHandler extends KeyAdapter {
/** The number of key presses we've had while waiting for an "any key" press */
private int pressCount = 1;
* Notification from AWT that a key has been pressed. Note that
* a key being pressed is equal to being pushed down but NOT
* released. Thats where keyTyped() comes in.
* @param e The details of the key that was pressed
public void keyPressed(KeyEvent e) {
// if we're waiting for an "any key" typed then we don't
// want to do anything with just a "press"
if (waitingForKeyPress) {
return;
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
leftPressed = true;
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
rightPressed = true;
if (e.getKeyCode() == KeyEvent.VK_SPACE) {
firePressed = true;
* Notification from AWT that a key has been released.
* @param e The details of the key that was released
public void keyReleased(KeyEvent e) {
// if we're waiting for an "any key" typed then we don't
// want to do anything with just a "released"
if (waitingForKeyPress) {
return;
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
leftPressed = false;
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
rightPressed = false;
if (e.getKeyCode() == KeyEvent.VK_SPACE) {
firePressed = false;
* Notification from AWT that a key has been typed. Note that
* typing a key means to both press and then release it.
* @param e The details of the key that was typed.
public void keyTyped(KeyEvent e) {
// if we're waiting for a "any key" type then
// check if we've recieved any recently. We may
// have had a keyType() event from the user releasing
// the shoot or move keys, hence the use of the "pressCount"
// counter.
if (waitingForKeyPress) {
if (pressCount == 1) {
// since we've now recieved our key typed
// event we can mark it as such and start
// our new game
waitingForKeyPress = false;
startGame();
pressCount = 0;
} else {
pressCount++;
// if we hit escape, then quit the game
if (e.getKeyChar() == 27) {
System.exit(0);
* The entry point into the game. We'll simply create an
* instance of class which will start the display and game
* loop.
* @param argv The arguments that are passed into our game
public static void main(String argv[]) {
Main g = new Main();
// Starts the main game loop, this method will not return until the game has finished running. Hence we are
// using the actual main thread to run the game.
g.gameLoop();
}Ap_Compsci_student_13 wrote:
ok sorry but doesn't sscce say to post the whole code?the first S is Short, and yes, it needs to be all the code needed to illustrate the problem and let use reproduce it. If you were developing a new Web framework, your example might be short, but for a student game it's very long. -
Need help to draw recangle on video
Hi guys ,
Below I have pasted my code . In this code I have defined frame and in that frame stored video run. The other class has defined rectangle in cnvas . My problem is that I want rectangle to be drawn on video player and I havnt been successful.
So its my reequest to please help me out.
Thanks a ton in advance........
public class Map extends JFrame
* MAIN PROGRAM / STATIC METHODS
public static void main(String args[])
Map mdi = new Map();
static void Fatal(String s)
MessageBox mb = new MessageBox("JMF Error", s);
* VARIABLES
JMFrame jmframe = null;
JDesktopPane desktop;
FileDialog fd = null;
CheckboxMenuItem cbAutoLoop = null;
Player player = null;
Player newPlayer = null;
//JPanel glass = null;
SelectionArea drawingPanel;
String filename;
// code//
//ArrayList<Rectangle> rectangles = new ArrayList<Rectangle>();
// boolean stop=false;
* METHODS
public Map()
super("Java Media Player");
drawingPanel = new SelectionArea(this);
// Add the desktop pane
setLayout( new BorderLayout() );
desktop = new JDesktopPane();
desktop.setDoubleBuffered(true);
add("Center", desktop);
setMenuBar(createMenuBar());
setSize(640, 480);
setVisible(true);
//add(drawingPanel);
//drawingPanel.setVisible(true);
try
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
catch (Exception e)
System.err.println("Could not initialize java.awt Metal lnf");
addWindowListener( new WindowAdapter()
public void windowClosing(WindowEvent we)
System.exit(0);
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, new Boolean(true));
private MenuBar createMenuBar()
ActionListener al = new ActionListener()
public void actionPerformed(ActionEvent ae)
String command = ae.getActionCommand();
if (command.equals("Open"))
if (fd == null)
fd = new FileDialog(Map.this, "Open File",
FileDialog.LOAD);
fd.setDirectory("/movies");
fd.show();
if (fd.getFile() != null)
String filename = fd.getDirectory() + fd.getFile();
openFile("file:" + filename);
else if (command.equals("Exit"))
dispose();
System.exit(0);
MenuItem item;
MenuBar mb = new MenuBar();
// File Menu
Menu mnFile = new Menu("File");
mnFile.add(item = new MenuItem("Open"));
item.addActionListener(al);
mnFile.add(item = new MenuItem("Exit"));
item.addActionListener(al);
// Options Menu
Menu mnOptions = new Menu("Options");
cbAutoLoop = new CheckboxMenuItem("Auto replay");
cbAutoLoop.setState(true);
mnOptions.add(cbAutoLoop);
mb.add(mnFile);
mb.add(mnOptions);
return mb;
* Open a media file.
public void openFile(String filename)
String mediaFile = filename;
Player player = null;
// URL for our media file
URL url = null;
try
// Create an url from the file name and the url to the
// document containing this applet.
if ((url = new URL(mediaFile)) == null)
Fatal("Can't build URL for " + mediaFile);
return;
// Create an instance of a player for this media
try
player = Manager.createPlayer(url);
catch (NoPlayerException e)
Fatal("Error: " + e);
catch (MalformedURLException e)
Fatal("Error:" + e);
catch (IOException e)
Fatal("Error:" + e);
if (player != null)
this.filename = filename;
JMFrame jmframe = new JMFrame(player, filename);
desktop.add(jmframe);
if (player.getVisualComponent() != null)
getContentPane().add(player.getVisualComponent());
player.start();
jmframe.add(drawingPanel);
drawingPanel.setVisible(true);
/*validate();
public void paint(Graphics g)
drawingPanel.repaint();
public void update(Graphics g)
paint(g);
drawingPanel.repaint();
class SelectionArea extends Canvas implements ActionListener, MouseListener, MouseMotionListener
Rectangle currentRect;
Map controller;
//for double buffering
Image image;
Graphics offscreen;
public SelectionArea(Map controller)
super();
this.controller = controller;
addMouseListener(this);
addMouseMotionListener(this);
public void actionPerformed(ActionEvent ae)
repaintoffscreen();
public void repaintoffscreen()
image = createImage(this.getWidth(), this.getHeight());
offscreen = image.getGraphics();
Dimension d = size();
if(currentRect != null)
//Rectangle box = new Rectangle();
//box.getDrawable(currentRect, d);
Rectangle box = getDrawableRect(currentRect, d);
//Draw the box outline.
offscreen.drawRect(box.x, box.y, box.width - 1, box.height - 1);
repaint();
public void mouseEntered(MouseEvent me) {}
public void mouseExited(MouseEvent me){ }
public void mouseClicked(MouseEvent me){}
public void mouseMoved(MouseEvent me){}
public void mousePressed(MouseEvent me)
currentRect = new Rectangle(me.getX(), me.getY(), 0, 0);
repaintoffscreen();
public void mouseDragged(MouseEvent me)
System.out.println("here in dragged()");
currentRect.setSize(me.getX() - currentRect.x, me.getY() - currentRect.y);
repaintoffscreen();
repaint();
public void mouseReleased(MouseEvent me)
currentRect.setSize(me.getX() - currentRect.x, me.getY() - currentRect.y);
repaintoffscreen();
repaint();
public void update(Graphics g)
paint(g);
public void paint(Graphics g)
g.drawImage(image, 0, 0, this);
Rectangle getDrawableRect(Rectangle originalRect, Dimension drawingArea)
int x = originalRect.x;
int y = originalRect.y;
int width = originalRect.width;
int height = originalRect.height;
//Make sure rectangle width and height are positive.
if (width < 0)
width = 0 - width;
x = x - width + 1;
if (x < 0)
width += x;
x = 0;
if (height < 0)
height = 0 - height;
y = y - height + 1;
if (y < 0)
height += y;
y = 0;
//The rectangle shouldn't extend past the drawing area.
if ((x + width) > drawingArea.width)
width = drawingArea.width - x;
if ((y + height) > drawingArea.height)
height = drawingArea.height - y;
return new Rectangle(x, y, width, height);
}Chances of someone reading a gazillion lines of unformatted code: < 1%
Paste your code (from the source), highlight it and click the CODE button to retain formatting and make it readable. -
Need help to draw a graph from the output I get with my program please
Hi all,
I please need help with this program, I need to display the amount of money over the years (which the user has to enter via the textfields supplied)
on a graph, I'm not sure what to do further with my program, but I have created a test with a System.out.println() method just to see if I get the correct output and it looks fine.
My question is, how do I get the input that was entered by the user (the initial deposit amount as well as the number of years) and using these to draw up the graph? (I used a button for the user to click after he/she has entered both the deposit and year values to draw the graph but I don't know how to get this to work?)
Please help me.
The output that I got looked liked this: (just for a test!) - basically this kind of output must be shown on the graph...
The initial deposit made was: 200.0
After year: 1 Amount is: 210.00
After year: 2 Amount is: 220.50
After year: 3 Amount is: 231.53
After year: 4 Amount is: 243.10
After year: 5 Amount is: 255.26
After year: 6 Amount is: 268.02
After year: 7 Amount is: 281.42
After year: 8 Amount is: 295.49
After year: 9 Amount is: 310.27
After year: 10 Amount is: 325.78
After year: 11 Amount is: 342.07
After year: 12 Amount is: 359.17
After year: 13 Amount is: 377.13
After year: 14 Amount is: 395.99
After year: 15 Amount is: 415.79
After year: 16 Amount is: 436.57
After year: 17 Amount is: 458.40And here is my code that Iv'e done so far:
import javax.swing.*;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.Math;
import java.text.DecimalFormat;
public class CompoundInterestProgram extends JFrame implements ActionListener {
JLabel amountLabel = new JLabel("Please enter the initial deposit amount:");
JTextField amountText = new JTextField(5);
JLabel yearsLabel = new JLabel("Please enter the numbers of years:");
JTextField yearstext = new JTextField(5);
JButton drawButton = new JButton("Draw Graph");
public CompoundInterestProgram() {
super("Compound Interest Program");
setSize(500, 500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
amountText.addActionListener(this);
yearstext.addActionListener(this);
JPanel panel = new JPanel();
panel.setBackground(Color.white);
panel.add(amountLabel);
amountLabel.setToolTipText("Range of deposit must be 20 - 200!");
panel.add(amountText);
panel.add(yearsLabel);
yearsLabel.setToolTipText("Range of years must be 1 - 25!");
panel.add(yearstext);
panel.add(drawButton);
add(panel);
setVisible(true);
public static void main(String[] args) {
DecimalFormat dec2 = new DecimalFormat( "0.00" );
CompoundInterestProgram cip1 = new CompoundInterestProgram();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new GraphPanel());
f.setSize(500, 500);
f.setLocation(200,200);
f.setVisible(true);
Account a = new Account(200);
System.out.println("The initial deposit made was: " + a.getBalance() + "\n");
for (int year = 1; year <= 17; year++) {
System.out.println("After year: " + year + " \t" + "Amount is: " + dec2.format(a.getBalance() + a.calcInterest(year)));
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
class Account {
double balance = 0;
double interest = 0.05;
public Account() {
balance = 0;
interest = 0.05;
public Account(int deposit) {
balance = deposit;
interest = 0.05;
public double calcInterest(int year) {
return balance * Math.pow((1 + interest), year) - balance;
public double getBalance() {
return balance;
class GraphPanel extends JPanel {
public GraphPanel() {
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.red);
}Your help would be much appreciated.
Thanks in advance.watertownjordan wrote:
http://www.jgraph.com/jgraph.html
The above is also good.Sorry but you need to look a bit more closely at URLs that you cite. What the OP wants is a chart (as in X against Y) not a graph (as in links and nodes) . 'jgraph' deals with links and nodes.
The best free charting library that I know of is JFreeChart from www.jfree.org. -
Need help with using graphics in swing components
Hi. I'm new to Java and trying to learn it while also developing an application for class this semester. I've been following online tutorials for about 2 months now, though, and so I'm not sure my question counts as a "new to Java" question any more as the code is quite long.
Here is the basic problem. I started coding the application as a basic awt Applet (starting at "Hello World") and about a month in realized that Swing components offer better buttons, panels, layouts, etc. So I converted the application, called BsfAp, to a new JApplet and started adding JPanels and JComponents with layout managers. My problem is, none of the buffered graphics run in any kind of JPanel, only the buttons do. I assume the buffered graphics are written straight to the JApplet top level container instead but I'm not entirely sure.
So as to not inundate the forum with code, the JApplet runs online at:
http://mason.gmu.edu/~dho2/files/sensor.html
The source code is also online at:
http://mason.gmu.edu/~dho2/files/BsfAp.java
What I would like to do is this - take everything in the GUI left of the tabbed button pane and put it into a JScrollPane so that I can use a larger grid size with map display I can scroll around. The grid size I would like to use is more like 700x1000 pixels, but I only want to display about 400x400 pixels of it at a time in the JScrollPane. Then I could also move this JScrollPane around with layout manager. I think this is possible, but I don't know how to do it.
I'm sure the code is not organized or optimized appropriately to those of you who use Java every day, but again I'm trying to learn it. ;-)
Thanks for any help or insight you could provide in this.
MattCouple of recs:
* Don't override paint and paint directly on the JApplet. Paint on a JPanel and override paintComponent.
* The simplest way to display a graphic is to put an image into an ImageIcon and show this in a JLabel. This can then easily go inside of the JScrollPane.
* You can also create a graphics JPanel that overrides the paintComponent, draw the image in that and show that inside of the JScrollPane.
* don't call paint() directly. Call repaint if you want the graphic to repaint.
Here's a trivial example quickly put together:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class BsfCrap extends JApplet
private JPanel mainPanel = new JPanel();
private JScrollPane scrollPane;
private JPanel graphicsPanel = new JPanel()
@Override
protected void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
RenderingHints rh = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHints(rh);
Paint gPaint = new GradientPaint(0, 0, Color.blue,
40, 40, Color.magenta, true);
g2d.setPaint(gPaint);
g2d.fill(new Ellipse2D.Double(0, 0, 800, 800));
public BsfCrap()
mainPanel.setPreferredSize(new Dimension(400, 400));
mainPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
graphicsPanel.setPreferredSize(new Dimension(800, 800));
graphicsPanel.setBackground(Color.white);
scrollPane = new JScrollPane(graphicsPanel);
scrollPane.setPreferredSize(new Dimension(300, 300));
mainPanel.add(scrollPane);
public JPanel getMainPanel()
return mainPanel;
@Override
public void init()
try
SwingUtilities.invokeAndWait(new Runnable()
public void run()
setSize(new Dimension(400, 400));
getContentPane().add(new BsfCrap().getMainPanel());
catch (InterruptedException e)
e.printStackTrace();
catch (InvocationTargetException e)
e.printStackTrace();
}
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