我是Java 2d图形的初学者，而stackoverflow的新手如果做错了就原谅我。我正在尝试做一个涉及连锁反应的迷你游戏。例如，我想在具有单独线程的JPanel上放置10个球弹跳。当我点击JPanel上的一个球时，我希望它能够扩展，并且每一个击中它的球也会扩展。我已经设法在一个Java文件中执行此操作，但我不能使它在单独的文件中工作。任何输入都表示赞赏。谢谢。
这是我的单个文件BounceBall.java：
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.util.*;
public class BounceBall extends JFrame {
private ShapePanel drawPanel;
private Vector<NewBall> Balls;
private JTextField message;
// set up interface
public BounceBall() {
super("MultiThreading");
drawPanel = new ShapePanel(400, 345);
message = new JTextField();
message.setEditable(false);
Balls = new Vector<NewBall>();
add(drawPanel, BorderLayout.NORTH);
add(message, BorderLayout.SOUTH);
setSize(400, 400);
setVisible(true);
createBalls();
} // end Ex20 constructor
public void createBalls() {
for (int i = 1; i <= 20; i++) {
NewBall nextBall = new NewBall();
Balls.addElement(nextBall);
nextBall.start();
message.setText("Number of Balls: " + Balls.size());
}
}
public static void main(String args[]) {
BounceBall application = new BounceBall();
application.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
// Class NewBall is used to create a ball and move its position
// A thread overrides the run method to define how the ball behaves
// Each ball is one instance of this class
private class NewBall extends Thread {
private Ellipse2D.Double thisBall;
private boolean ballStarted, growBall, growEnd;
private int size = 30, speed = 70; // characteristics
private int deltax, deltay; // of the ball
Random r = new Random();
int red = r.nextInt(255), green = r.nextInt(255), blue = r.nextInt(255);
public NewBall() {
// Create new ball with random size, speed, start point,
// and direction. "Speed" is actually the amount of sleep
// between moves.
ballStarted = true;
// size = 10 + (int)(Math.random() * 60);
// speed = 10 + (int)(Math.random() * 100);
int startx = (int) (Math.random() * 300);
int starty = (int) (Math.random() * 300);
deltax = -10 + (int) (Math.random() * 21);
deltay = -10 + (int) (Math.random() * 21);
if ((deltax == 0) && (deltay == 0)) {
deltax = 1;
}
thisBall = new Ellipse2D.Double(startx, starty, size, size);
}
public void draw(Graphics2D g2d) {
if (thisBall != null) {
g2d.setColor(new Color(red, green, blue, 80));
g2d.fill(thisBall);
}
}
public void grow() {
growBall = true;
}
void removeBall() {
for (int i = 0; i < Balls.size(); i++) {
Balls.remove(i);
}
repaint();
}
public double getPositionX() {
return thisBall.getX();
}
public double getPositionY() {
return thisBall.getY();
}
public int radius() {
return size * 2;
}
public void run() {
while (ballStarted && !growBall) // Keeps ball moving
{
try {
// To free up processor time
Thread.sleep(speed);
} catch (InterruptedException e) {
System.out.println("Woke up prematurely");
}
// calculate new position and move ball
int oldx = (int) thisBall.getX();
int oldy = (int) thisBall.getY();
int newx = oldx + deltax;
if (newx + size > drawPanel.getWidth() || newx < 0) {
deltax = -deltax;
}
int newy = oldy + deltay;
if (newy + size > drawPanel.getHeight() || newy < 0) {
deltay = -deltay;
}
thisBall.setFrame(newx, newy, size, size);
while (growBall && size < 80) {
try {
// To free up processor time
Thread.sleep(speed);
} catch (InterruptedException e) {
System.out.println("Woke up prematurely");
}
size++;
thisBall.setFrame(newx, newy, size, size);
for (int i = 0; i < Balls.size(); i++) {
if (thisBall.contains(Balls.get(i).thisBall.x, Balls.get(i).thisBall.y)) {
Balls.get(i).grow();
}
}
}
drawPanel.repaint();
}
}
} // end NewBall
// Define a class to be a panel on which the balls are drawn
private class ShapePanel extends JPanel {
private int prefwid, prefht;
public ShapePanel(int pwid, int pht) {
prefwid = pwid;
prefht = pht;
// add ball when mouse is clicked
addMouseListener(
new MouseAdapter() {
public void mousePressed(MouseEvent e) {
stopBall(e);
}
});
}
public void stopBall(MouseEvent e) {
for (int i = 0; i < Balls.size(); i++) {
if (Balls.get(i).thisBall.contains(e.getPoint())) {
Balls.get(i).grow();
}
}
}
public Dimension getPreferredSize() {
return new Dimension(prefwid, prefht);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
for (int i = 0; i < Balls.size(); i++) {
(Balls.elementAt(i)).draw(g2d);
}
}
} // end ShapePanel inner class
} // end BounceBall
这是我尝试做的3个类：Ball.java
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.util.Random;
public class Ball extends Thread {
public Ellipse2D.Double thisBall;
public int size=30,xPoz,yPoz;
Random r=new Random();
int red=r.nextInt(255),green=r.nextInt(255),blue=r.nextInt(255);
int deltax,deltay;
public boolean ballStarted;
public Ball()
{xPoz=(int)Math.random();
yPoz=(int)Math.random();
ballStarted = true;
deltax=-10+(int)(Math.random()*21);
deltay=-10+(int)(Math.random()*21);
if ((deltax == 0) && (deltay == 0)) { deltax = 1; }
thisBall=new Ellipse2D.Double(xPoz,yPoz,size,size);
super.start();
}
public void draw(Graphics2D g2d){
if(thisBall!=null)
{g2d.setColor(new Color(red,green,blue,80));
g2d.fill(thisBall);
}
}
public int PozX(){return xPoz;}
public int PozY(){return yPoz;}
public int radius(){return size*2;}
public void grow(){
size++;
thisBall.setFrame(xPoz,yPoz,size,size);
}
public void move(){
int oldx=xPoz;
int oldy=yPoz;
int newx=oldx+deltax;
int newy=oldy+deltay;
if(newx+size>800 || newx<0)
deltax=-deltax;
if(newy+size>600 || newy<0)
deltay=-deltay;
thisBall.setFrame(newx,newy,size,size);
}
public void run(){
try {
Thread.sleep(100);
}
catch (InterruptedException e)
{ System.out.println("Thread Halted");}
while(ballStarted)
{move();}
}
}
ShapePanel.java：
public class ShapePanel extends JPanel{
private int prefwid, prefht,nrBalls;
public Vector<Ball> Balls=new Vector<Ball>();;
public ShapePanel (int pwid, int pht)
{
prefwid = pwid;
prefht = pht;
addMouseListener(
new MouseAdapter() {
public void mousePressed(MouseEvent e)
{
}
}
);
}
public void createBalls(){
for(int i=1;i<=nrBalls;i++)
{ Ball movingBall=new Ball();
Balls.addElement(movingBall);
//movingBall.start();
}
}
public Dimension getPreferredSize()
{
return new Dimension(prefwid, prefht);
}
public void setNrBalls(int n){this.nrBalls=n;}
public void paintComponent (Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
for (Ball ball : Balls) {
ball.draw(g2d);
}
g2d.dispose();
}
}
和BallBlaster.java：
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class BallBlaster extends JFrame
{
private ShapePanel drawPanel;
private JTextField message;
// set up interface
public BallBlaster()
{
super("MultiThreading");
drawPanel = new ShapePanel(800, 600);
message = new JTextField("Number of balls : ");
message.setEditable(false);
add(drawPanel, BorderLayout.NORTH);
add(message, BorderLayout.SOUTH);
setSize(800, 600);
setVisible(true);
drawPanel.setNrBalls(20);
drawPanel.repaint();
}
public static void main(String args[]) {
BoomShine application = new BoomShine();
application.addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}
}
答案 0 :(得分：1)
将内部类转换为公共类时，应将对象引用移动到适当的类。例如，Balls数组应该转到ShapePanel，Ball类应该引用ShapePanel。创建和删除球的方法应该移动到ShapePanel。这样你就可以给每个班级一个单一的责任，ShapePanel可以用球，球移动等等......
答案 1 :(得分：-1)
董事会详情
-> Default board size is 8*8 Matrix.
-> Number of User Minimum 2 user and Maximum 10 user.
-> Displaying separate User ball_Count is(eg. The First User(1) balls are displayed in ((User_ID * 10) + ball_Count) ).
(Eg). UserId – 1
Position Of the Board ith and jth value 0,0
the ball value is displayed as 11
again clik(enter same position of first user ) it value is displayed as 12
球数显示逻辑 - ＆gt; （（User_ID * 10）+ Ball_Count）
**样本输出：**
Enter the number of player : 2
0 1 2 3 4 5 6 7
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0 | 0 0 0 0 0 0 0 0
|
1 | 0 0 0 0 0 0 0 0
|
2 | 0 0 0 0 0 0 0 0
|
3 | 0 0 0 0 0 0 0 0
|
4 | 0 0 0 0 0 0 0 0
|
5 | 0 0 0 0 0 0 0 0
|
6 | 0 0 0 0 0 0 0 0
|
7 | 0 0 0 0 0 0 0 0
|
Now Player 1 term.......
Enter ith and jth Position..... : 0 0
0 1 2 3 4 5 6 7
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0 | 11 0 0 0 0 0 0 0
|
1 | 0 0 0 0 0 0 0 0
|
2 | 0 0 0 0 0 0 0 0
|
3 | 0 0 0 0 0 0 0 0
|
4 | 0 0 0 0 0 0 0 0
|
5 | 0 0 0 0 0 0 0 0
|
6 | 0 0 0 0 0 0 0 0
|
7 | 0 0 0 0 0 0 0 0
|
Now Player 2 term.......
Enter ith and jth Position..... : 0 1
0 1 2 3 4 5 6 7
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0 | 11 21 0 0 0 0 0 0
|
1 | 0 0 0 0 0 0 0 0
|
2 | 0 0 0 0 0 0 0 0
|
3 | 0 0 0 0 0 0 0 0
|
4 | 0 0 0 0 0 0 0 0
|
5 | 0 0 0 0 0 0 0 0
|
6 | 0 0 0 0 0 0 0 0
|
7 | 0 0 0 0 0 0 0 0
|
Now Player 1 term.......
Enter ith and jth Position..... : 0 0
<--------The player 1 is win ---------->
0 1 2 3 4 5 6 7
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0 | 0 12 0 0 0 0 0 0
|
1 | 11 0 0 0 0 0 0 0
|
2 | 0 0 0 0 0 0 0 0
|
3 | 0 0 0 0 0 0 0 0
|
4 | 0 0 0 0 0 0 0 0
|
5 | 0 0 0 0 0 0 0 0
|
6 | 0 0 0 0 0 0 0 0
|
7 | 0 0 0 0 0 0 0 0
|
Program :
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int bord[8][8];
int eluminetUser[11]={0,1,1,1,1,1,1,1,1,1,1};
int eluminetUserCount;
int no_player;
int printBord(){
printf("\n\n\t 0 \t 1 \t 2 \t 3 \t 4 \t 5 \t 6 \t 7 ");
printf("\n\t~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
for(int i = 0; i<8;i++){
printf(" %d |",i);
for(int j = 0;j<8;j++){
printf("\t %d ",bord[i][j]);
}
printf("\n |\n");
}
return 0;
}
int checkBord(){
static int userCount;
int result = 0,count = 0,eCount = 0;
userCount++;
if(no_player > userCount)
return 0;
bzero(eluminetUser,40);
for(int i = 0; i<8;i++)
for(int j = 0;j<8;j++)
if(bord[i][j] != 0 )
eluminetUser[bord[i][j]/10] = 1;
for(int i = 1 ; i <= no_player ; i++ )
if(eluminetUser[i])
eCount++;
if(eCount>1)
return 0;
return 1;
}
int playBord(int ith, int jth, int current_player, int type){
int count = 0;
if((ith<0) || (jth<0) || (ith>7) || (jth>7))
return 8;
if(type){//user saide clike
bord[ith][jth] = !bord[ith][jth] ? (current_player*10)+1 : bord[ith][jth]+1 ;
}
else{ //system saide spreading the bal
bord[ith][jth] = (current_player *10) + (bord[ith][jth]%10) + 1;
}
count = bord[ith][jth]%10;
if((ith == 0) && (jth == 0) && (count == 2)){
bord[ith][jth] = 0;
playBord(ith+1, jth, current_player, 0);
playBord(ith, jth+1, current_player, 0);
}else if((ith == 0) && (jth == 7) && (count == 2)){
bord[ith][jth] = 0;
playBord(ith+1, jth, current_player, 0);
playBord(ith, jth-1, current_player, 0);
}else if((ith == 7) && (jth == 7) && (count == 2)){
bord[ith][jth] = 0;
playBord(ith-1, jth, current_player, 0);
playBord(ith, jth-1, current_player, 0);
}else if((ith == 7) && (jth == 0) && (count == 2)){
bord[ith][jth] = 0;
playBord(ith-1, jth, current_player, 0);
playBord(ith, jth+1, current_player, 0);
}else if((ith == 0) && (count == 3)){
bord[ith][jth] = 0;
playBord(ith ,jth-1, current_player, 0);
playBord(ith+1, jth, current_player, 0);
playBord(ith, jth+1, current_player, 0);
}else if((ith == 7) && (count == 3)){
bord[ith][jth] = 0;
playBord(ith,jth-1,current_player,0);
playBord(ith-1,jth,current_player,0);
playBord(ith,jth+1,current_player,0);
}else if((jth == 7) && (count == 3)){
bord[ith][jth] = 0;
playBord(ith-1,jth,current_player,0);
playBord(ith,jth-1,current_player,0);
playBord(ith+1,jth,current_player,0);
}
else if((jth == 0) && (count == 3)){
bord[ith][jth] = 0;
playBord(ith-1,jth,current_player,0);
playBord(ith,jth+1,current_player,0);
playBord(ith+1,jth,current_player,0);
}else if(count == 4){
bord[ith][jth] = 0;
playBord(ith-1,jth,current_player,0);
playBord(ith,jth-1,current_player,0);
playBord(ith,jth+1,current_player,0);
playBord(ith+1,jth,current_player,0);
}
/*if(checkBord()){
return 1;
}*/
return 0;
}
int main(){
int current_player = 1,ith,jth,count = 0;
printf("Enter the number of player : ");
scanf("%d",&no_player);
if(no_player<2){
printf("\npls select 2 or more user....\n\n");
return 0;
}
while(1){
printBord();
if(current_player == (no_player+1)){
current_player = 1;
}
if(eluminetUser[current_player]){// if the user is exist going to get location (eg.) User 1 and 3 is exist and User 2 is out so the current_player is comes to 2 User but that user is not exist so skip the User 2 position.
printf("\nNow Player %d term....... ",current_player);
printf("\nEnter ith and jth Position..... : ");
scanf("%d%d",&ith,&jth);
if((bord[ith][jth] == 0 ) || (bord[ith][jth] / 10 ) == current_player){
if( playBord(ith,jth,current_player,1) == 8)
{
printf("\n\n Position is invalid ......\n\n");
count--;
current_player--;
}
if(checkBord()&& ( count >= no_player))
{
printf("\n\n\n<--------The player %d is win ---------->\n\n",current_player);
break;
}
}
else{
printf("\n\n%d,%d Position not your's pls choose correct position\n\n",ith,jth);
}
}
current_player++;
count++;
}
printBord();
return 0;
}