How To Make Pong Ball Slowly Increase Speed
Apr 11, 2013
I was making a pong game, part copied code off the internet, part my own code, part my friends code. It works well enough, but the ball starts at one speed, and stays the same. I would like to know how to make the ball slowly increase.
It is a java applet, which shouldn't casue any harm right?
My code:
Pong Applet
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Pong extends Applet implements MouseMotionListener, KeyListener {
[Code] .....
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Apr 23, 2014
I wrote a code from our text book for Pong. Im trying to figure out how to fill the ball with color. Im also wondering how to speed the ball up once there is contact with the paddle. The initial speed is ok but once contact is made with the paddle, it slows down. Makes it too easy to play. Here is my code so far. As far as the game goes, it works and is good. Just wanted to add a couple customizations.
Java Code:
package pong;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
[Code] .....
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Jul 28, 2014
I am trying to make a game of pong and am having trouble adding my ball class to a JPanel. Here is what I have so far.
package pong;
import java.awt.*;
public class Ball{
private int xPos,yPos;
public int dx = 5, dy = -5;
public Ball()
[code].....
I want to be able to add this to a JPanel but it is not allowing me to add the ball. Here is my JPanel
package pong;
import java.awt.*;
import javax.swing.JPanel;
public class BallTestPanel
[Code] ....
It reads panel.add(ball); as an error. I says that I need to change the type ball to component.
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Feb 26, 2014
I have created this ping pong game but having problem with ball and paddle collusion. After first collusion it gives score 1 but later it never touch the paddle.
Code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.Random.*;
import javax.swing.ImageIcon;
public class Ball extends JFrame implements ActionListener, KeyListener{
int xSpeed=0;
[Code] ....
I think something is wrong here:
public void actionPerformed(ActionEvent e){
y=y+xSpeed;
repaint();
if(y> this.getWidth()){
y=25;
score -=1;
}
if(blockRect.intersects(ballRect)){
y=40;
score +=1;
x =200;
y = 300;
}
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May 9, 2014
I need to make a scoreboard that can count how many times a ball hits a moving platform in pong and have no clue how to approach this.
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Jun 25, 2013
I want to make a simply game,actualy not a game but I want to moving object curve just like angry bird. Where I can move an object with curve motion. But I don't know how. I just can make it move straight(left,right,down,up).
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Feb 11, 2014
a) I have a Ball Object which implements the Runnable interface and traces the various positions of a ball.
b) I then have a Ball_Bounce JPanel inside a JFrame which creates two instances of the Ball object and then paints them to the JPanel.
As per my understanding, when the main() program in Ball_Bounce.java is started, there a total of three threads running in this program, one for each ball and one for the main(). What I cannot understand is whenever the balls collide, I end up getting the "Collision" message twice even though the collision is checked only in the main() thread.
[#]public class Ball implements Runnable
{
private boolean xUp, yUp, xUp1, yUp1;
private int x, y, xDx, yDy;
private final int MAX_X = 500, MAX_Y = 500;
private boolean flag = true;
private static Thread ball;
[code]...
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Feb 11, 2015
I have to write a program that asks the user to enter "air", "water", or "steel", and the distance that a sound wave will travel in the medium. The program should then display the amount of time it will take. The amount of time it takes sound to travel in air can be calculated as follows;
Time = Distance/1,100
The amount of time it takes sound to travel in water can be calculated with the following formula:
Time=Distance/4,900
The amount of time it takes sound to travel in steel can be calculated with the following formula:
Time=Distance/16400
Here is my code:
import java.lang.String;
/**
This program displays numbers padded with leading zeros.
*/
public class SpeedofSound {
public static void main(String[] args) {
double D; // declares this as double
D = keyboard.nextDouble();
const double A = 1100; // declares this as a constant
[Code] .....
The following is the error I'm getting:
----jGRASP exec: javac SpeedofSound.Java
error: Class names, 'SpeedofSound.Java', are only accepted if annotation processing is explicitly requested
1 error
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.
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Jul 27, 2014
I can't get the output to read correctly. I get 0 as the answer.
import java.util.Scanner;
public class TheSpeedofSound777
{
public static void main(String[] args)
{
System.out.println("Gordon Elam Sr July 26, 2014 ");
[code]...
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Jan 5, 2015
public class TextLab03st
{
public static void main(String args[])
{
System.out.println("Text Lab 03");
System.out.println();
System.out.print("What is the posted speed limit? --> ");
int speedLimit = Expo.enterString();
System.out.println("");
System.out.print("How fast was the car travelling in mph? --> ");
int trueSpeed = Expo.enterString();
int ticketPrice;
[code]...
I tried everything and there's supposedly one error saying it reached the end of the file while parsing. I'm trying to make a speeding ticket program for my class.
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Feb 25, 2014
Two machines are connected in a LAN & Sharing Files in between them.
Everything is Working Fine but now i want to calculate the Copying Speed/data transfer Speed between them.
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Apr 19, 2014
I'm a beginner at java and am trying to code a basic pong game java applet. The code has no errors in it but when i run it the .png's do not come up in the window until its moved off screen. when the .png's are shown they do not update whatsoever. I thought the problem could be with the key-listener but even the ball (which moves independently of user input) does not move.
I've placed all the code from the 5 classes below. There's some unnecessary code in the background class but that's because I'm thinking of making the background scroll later on.
package main;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.net.URL;
[Code] ....
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Sep 27, 2014
So i'm using Netbeans and have created this template for the program i want to create. Basically what I want to do is enter a time and date in 24hr format including seconds and the date of start and end time and have the program calculate the time difference between Tool launch and tool Receive that takes into factor the Launch and Receive Dates for a total of hh:mm:ss duration. I don't know how to combine both those factors output one number in a total number of hours Duration. I'm also having problems linking the ODO (odometer) which the formula would basically be time/ODO (or distance in feet) = x.x ft/sec format.
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates and open the template in the editor.
*/
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
[Code] .....
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Jan 5, 2014
Is there a way to measure current download speed of a file being downloaded? I've searched all over google and the only thing i get is average download speed. This is basically how it is being done, the result is average download speed.
Java Code:
OutputStream out = null;
URLConnection conn;
InputStream in = null;
long startup = System.currentTimeMillis();
try {
URL url = new URL(adress);
out = new BufferedOutputStream(
[Code] .....
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Jun 4, 2014
I can't figure out this problem that I'm having in my Pong game. It's compiling fine, except when I run it, it gives me an overflow error.
Here's the code:
// Pong
import javax.swing.JFrame;
import java.awt.Color;
import java.awt.Graphics;
public class Pong extends JFrame {
private static final int WIDTH = 400;
private static final int HEIGHT = 400;
[Code] .....
Here's the error:
java.lang.StackOverflowError
at sun.awt.AppContext.get(AppContext.java:604)
at com.sun.java.swing.SwingUtilities3.getDelegateRepa intManager(SwingUtilities3.java:120)
at javax.swing.RepaintManager.getDelegate(RepaintMana ger.java:1625)
at javax.swing.RepaintManager.addDirtyRegion(RepaintM anager.java:445)
The error keeps going for a lot of more lines.
The line that gets highlighted is the first bracket of the Pong constructor.
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Jul 14, 2014
When I ran the methods "go1,go2,go3" separately without clicking on the menu , all of them worked well. by separately I mean, when I closed the program changed the source code from "go1;" to "go2" and go3. But when I click on the "change ball" and then "1 ball" or any thing, all I get is a new frame which is blank. And the old frame freezes.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
*
* @author Administrator
*/
[code]...
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Jan 30, 2015
if I move object A to one area of the screen I want object B to to move to object A's location but I also want object B to move at a fixed speed (movement variable). How do I go about doing this? Both the x and y coordinates of object B would need to know the coordinates of object A to calculate the distance between the two and to determine how much of which axis to increment/decrement (if that makes sense?) with the inclusion of the speed variable.In other words I'm just trying to create a homing object.
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Jan 28, 2014
I have made a "Pong" game and how to check if the ball has hit the top or the bottom of a paddle, however I do know how to check if it has hit the left or right side:
Java Code:
if((BALL.getX() >= LEFT_BAT.getX() && BALL.getX() <= LEFT_BAT.getX() + LEFT_BAT.getWidth()
&& BALL.getY() >= LEFT_BAT.getY() && BALL.getY() <= LEFT_BAT.getY() + LEFT_BAT.getHeight())
&& (BALL.getX() >= RIGHT_BAT.getX() && BALL.getX() <= RIGHT_BAT.getX() + RIGHT_BAT.getWidth()
&& BALL.getY() >= RIGHT_BAT.getY() && BALL.getY() <= RIGHT_BAT.getY() + RIGHT_BAT.getHeight())){
BALL.increaseDX();
BALL.setDX(-BALL.getDX());
} mh_sh_highlight_all('java');
It seems as though I would use the same code for checking the top or bottom.
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Dec 27, 2014
I don't know how to write a code to pong ball, when it touch red block.
public class bounc2 extends JPanel implements ActionListener,KeyListener{
double x = 0,y=0,velX=3,velY=3;
double x2 = 5,y2=145,velX2=0,velY2=0;
double x3= 473,y3=145,velX3=0,velY3=0;
Timer t = new Timer(5,this);
public bounc2(){
setBackground(Color.GREEN);
[Code] .....
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Feb 8, 2015
import java.util.Scanner;
public class SalesTax {
public static void main(String [] args) {
Scanner input = new Scanner(System.in);
double total = 0;
double currentTax = 0;
[Code] .....
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Dec 25, 2014
I want to make a simple game and learn java by experimenting with it.I don't know how to increase a value by clicking it.I know how to make my objects move in my small game with mouse or keys, but I also got a score var that I want to increase per click. I can increase it over time, but after 2 hours of trying I couldn't progress any further.This is the piece of code I used, I imported the class, got getters n setters and all of that...
if(e.getButton() == MouseEvent.BUTTON3) hud.setScore(hud.getScore() + 555);
Whenever I click I get an error, if I remember right "NullPointerException" is when something is missing I'm probably not targeting the value correctly...
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.tutorial.main.MouseListens.mouseClicked(MouseListens.java:22)
at java.awt.Component.processMouseEvent(Unknown Source)
[code]...
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May 15, 2015
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Oct 7, 2014
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This is what I have so far,
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for(Employee e: employees){
if(e instanceof HourlyEmployee){
HourlyEmployee he = (HourlyEmployee)e
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}
I'm not sure how to use the index to do this correctly, all it's doing right now is adding hours to every hourly employee
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Oct 7, 2014
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This is what I have so far,
public void increaseHours(int index, double amount){
for(Employee e: employees){
if(e instanceof HourlyEmployee){
HourlyEmployee he = (HourlyEmployee)e
he.increaseHours(amount);
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}
}
}
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When I try to write the .xlsx file using apache POI, XSSFWorkbook API and run this program in Eclipse STS, I am getting the java.lang.OutOfMemoryError: Java heap space error. Then I searched the net and add these -Xms512m -Xmx1024m in the eclipse VM arguments. Even though I am getting the same error. Again i increase heap size but i am getting the different error like "occurred during initialization of VM, Could not reserve enough space for object heap". how to increase the heap size or any other API to read, delete and write the .xlsx file. I am having 4GB ram in my machine. Apache POI is very good for .xls but if it is .xlsx performance wise it is very slow.
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