我遇到了问题,我想要绘制一个正方形(苍蝇)并重新绘制以显示运动。在此代码中,当按下按钮时,苍蝇会“移动”,但旧方块不会删除。我已经尝试过 enviromentPanel.repaint() updateui() 和 removeall() ,但我无法让它工作,如果我使用它们中的任何一个,那么任何形状都不会出现并且我得到一个空白屏幕。
import java.util.Random;
public class Fly implements Runnable{
private int xPosition;
private int yPosition;
private boolean eaten;
public Fly(){
Random randomGenerator = new Random();
xPosition = randomGenerator.nextInt(690) + 10;
yPosition = randomGenerator.nextInt(690) + 10;
eaten = false;
}
public int getxPosition() {
return xPosition;
}
public void setxPosition(int xPosition) {
this.xPosition = xPosition;
}
public int getyPosition() {
return yPosition;
}
public void setyPosition(int yPosition) {
this.yPosition = yPosition;
}
public boolean isEaten() {
return eaten;
}
public void setEaten(boolean eaten) {
this.eaten = eaten;
}
public void move(){
Random randomGenerator = new Random();
int xChange = -10 + randomGenerator.nextInt(20);
int yChange = -10 + randomGenerator.nextInt(20);
xPosition = xPosition + xChange;
yPosition = yPosition + yChange;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
move();
}
@Override
public String toString() {
return "Fly [xPosition=" + xPosition + ", yPosition=" + yPosition
+ ", eaten=" + eaten + "]";
}
@Override
public void run() {
move();
}
}
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.*;
import java.awt.*;
import javax.imageio.ImageIO;
public class Enviroment2 implements Runnable,ActionListener{
private JFrame frame;
private JPanel enviromentPanel,totalGUI,enviromentButtonPanel;
private JButton newFrogButton, resetButton, hungryButton;
private JTextField enterName;
private JLabel hungryLabel;
private ArrayList<Frog> frogs;
private ArrayList<Fly> flys;
public Enviroment2(){
totalGUI = new JPanel();
flys = new ArrayList<Fly>();
frogs = new ArrayList<Frog>();
enviromentPanel = new JPanel();
enviromentButtonPanel = new JPanel();
newFrogButton = new JButton("New Frog");
enterName = new JTextField("Enter name");
hungryButton = new JButton("Hungry!");
resetButton = new JButton("Reset");
frame = new JFrame("[=] Hungry Cyber Pet [=]");
JFrame.setDefaultLookAndFeelDecorated(true);
frame.setContentPane(runEnviroment());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(740, 800);
frame.setVisible(true);
}
public JPanel runEnviroment(){
totalGUI.setLayout(null);
enviromentPanel.setLayout(null);
enviromentPanel.setLocation(10, 10);
enviromentPanel.setSize(700, 700);
enviromentPanel.setBackground(Color.WHITE);
totalGUI.add(enviromentPanel);
FlowLayout experimentLayout = new FlowLayout();
enviromentButtonPanel.setLayout(experimentLayout);
enviromentButtonPanel.setLocation(10, 710);
enviromentButtonPanel.setSize(700, 50);
totalGUI.add(enviromentButtonPanel);
newFrogButton.setLocation(0, 0);
newFrogButton.setSize(120, 30);
newFrogButton.addActionListener(this);
enviromentButtonPanel.add(newFrogButton);
enterName.setLocation(140,0);
enterName.setSize(120,30);
enviromentButtonPanel.add(enterName);
hungryButton.setLocation(280, 0);
hungryButton.setSize(120, 30);
hungryButton.addActionListener(this);
enviromentButtonPanel.add(hungryButton);
resetButton.setLocation(420, 0);
resetButton.setSize(120, 30);
resetButton.addActionListener(this);
enviromentButtonPanel.add(resetButton);
totalGUI.setOpaque(true);
return totalGUI;
}
public void draw(){
Graphics paper = enviromentPanel.getGraphics();
for (int i = 0; i <= flys.size()-1; i++){
System.out.println("hi");
paper.setColor(Color.BLACK);
paper.fillRect(flys.get(i).getxPosition(), flys.get(i).getyPosition(), 10, 10);
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
draw();
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == newFrogButton){
Frog frog = new Frog(enterName.getText());
frogs.add(frog);
Fly fly = new Fly();
Thread t = new Thread(fly);
t.start();
flys.add(fly);
showFlys();
}
else if(e.getSource() == hungryButton){
}
else if(e.getSource() == resetButton){
frogs.clear();
flys.clear();
System.out.println(frogs);
System.out.println(flys);
}
}
public void showFlys(){
for (int i = 0; i <= flys.size()-1; i++){
System.out.println(flys.get(i));
}
}
@Override
public void run() {
draw();
}
}