Pong Game - Y Axis Collision Detection

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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Video Game - Collision Detection Class?

Apr 30, 2014

I use eclipse as my IDE. I have decided to make my own video game and somebody had sent me a class that could be used for collision detection. The problem with the collision detection class was that it made a box around an object and if something else had touched the object, the collision detection would work. My problem with this class is what happens when i want to use circles? I cant have a box drawn around it. Then it wouldn't work as i would want. Is there a pixel perfect collision detection class out there I can use? It'll be useful in my journey to become successful in computer science! By the way this is in the java language.

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Apr 19, 2014

I'm working on a space invaders game and I'm having problems with collision detection. My main issue is I'm having problems getting what the y value of the "missile" is as it goes up towards the top of the game. I have tried for many hours and tried to look at other people's space invaders game in an attempt to figure out how to figure out my problem. Also I'm not sure if I have the code for my collision detection in the correct spot. Right now I have the code in the keyPressed method. Below is the code for the main and missle classes ...

import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import java.util.Iterator;

[Code] ....

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Object Collision Detection - Character Freezes

Dec 2, 2014

I don't understand why when I collide into my objects my character freezes. Such as if I collide into collision() I can go left and right but, not up and if I collide into collision2() I freeze in all places but, if I collide into the bounds I made I can still go in all directions without problems. The xa and ya are still being set to 0.

package com.questkings.game;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;

[Code] .....

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Collision Detection Using Rectangles - Player Sometimes Passes Through The Tiles

May 19, 2014

I have already tried every possible way for removing this bug but all failed. The problem is that sometimes my player passes through the map tiles, i mean, the algorithm is like -- if not colliding, move in required direction; else if colliding, move in opposite direction. But sometimes the second condition fails i dont understand why.

private void movement(){
left=bindObject.getLeft();
right=bindObject.getRight();
up=bindObject.getUp();
down=bindObject.getDown();
bindObject.setColliding(colliding);

[Code] .....

Where bindObject is a class which contains key bindings of following keys:-

left arrow key (when pressed) , left arrow key (when released),
right arrow key (when pressed), right arrow key (when released),
up arrow key (when pressed), up arrow key (when released),
down arrow key (when pressed), down arrow key (when released)

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Pong Game Won't Update

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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Pong Game - Overflow Error

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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Simple Ping Pong Game

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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JAVA Platform Game Jumping And Collision

Sep 16, 2014

i have problem in what comes to jumping because in what i have now mario jumps with the key lsitener, key pressed up arrow and it jumps smooth but when im trying to make it fall down he appears immediatly at ground and it doesnt simulate the fall as it should be.

import java.awt.BorderLayout;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import java.awt.EventQueue;

[code]....

The other problem is that i dont really know how to detect collisions if there is a method that makes easier this proceso and how to make the map to continue and repeat so mario could continue walking,

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Simple Pong Game - Touch Red Block

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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Ping Pong Game - Ball Drop And Catch

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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Print Table (array) Where Have X Axis And Y Axis?

Apr 12, 2015

I want to print a table (array) where I have an X axis and a Y axis. 16x11. My code is as follows:

int Windchill [] [] = new int [16][11];
{
{60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, -5, -10, -15} //X
{0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50} //Y
};

The code doesn't work even though it's similar to

int Windchill [][] =
{
{60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, -5, -10, -15}, //X
{0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50}, //Y
};

if I remember correctly, the 2 are correct just written in different ways.

and I want it to print like this

{60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, -5, -10, -15},
{ 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
5, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
10, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
15, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
20, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
25, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
30, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
35, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
40, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
45, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,
50, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0,}

where 0 is null (for now). I want to fill those in with a formula later, but I don't hardcoding them one by one is the most "efficient" way to do it

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Jun 15, 2014

okay so far I have made a game with character that runs with constant velocity it jumps and ducks . I want the player to be dead on collision from a hurdle and then play a specific png, which shows the dying style . I am able to build collision detection but it passes from background I want it to collide and be dead on collision.

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May 25, 2015

I have a problem in with colissions in JavaFX.
 
First, I detect a collision between a line and a circle using the follow code:
 
if(line.getBoundsInParent().intersects(circle.getBoundsInParent())){
System.out.println("Collision!");
}
 
After this, i need catch the coordinate of collision, like the below figure:

How to catch this coordinate?
 
[]'s

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Mar 25, 2014

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Sep 3, 2014

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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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Jan 4, 2015

I have some problem checking if a directed graph has a cycle or not. So I have a given rooted directed graph, and find if there at least one existing cycle.

For example, I have to input the Root Node, followed by a number of nodes, the nodes in the graph, number of edges, and the adjacency list representing the edges. Each entry in the adjacency list contains a pair of nodes. The ordering of the nodes in the pair represents the direction of the edge. An entry A, B means that there is an edge from A to B. Nodes in each pair is separated by a space. One input per line.

And the output should display whether the directed graph has a cycle or not.

Sample input:

A //Root Node
6 //Number of Nodes
A //Nodes in Graph
B
C
D
E
F
6 //Number of edges
A B //Adjacency list representing the edges
B C
C D
C F
F E
E B

Output:
Cycle!

Graph Representation:

Based on the illustration above, the graph has one cycle. The cycle exists in nodes B, C, F and E.

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May 26, 2014

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Jul 10, 2014

I just have one problem with a "car" program in java. The objective is to move the car in the direction it is facing. Moving forward in the normal position (when the angle is zero) means moving in the x-axis. Choosing to turn the car function (for example: 90 ) and then using the forward function should move up or down the car in the y-axis. However the y-axis is not working.

Car2 Demo.rar
JPGMoveforwardfunction.jpg

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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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I am trying to detect the collision between a moving Jbutton and stationary Jbuttons using Rectangle Intersection.

When I run the program I am getting a NullPointerException on line 'msg1.setBounds(new Rectangle(320,50,400,50));'.

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class gamePanel01 extends JPanel implements KeyListener {
character ch1 = new character("Hero");
//Global Variables
JButton blocker01;
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[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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