电网定时问题

Question

我正在努力沿"网格"移动形状。我似乎终于想通了，但我遇到了一个小问题;无论我多么接近每个运动之间的特定时间间隔，似乎仍然偏离了网格。我想使用我正在使用的当前方法，因为我了解 thigs 是如何以这种方式工作的。我知道它有时会出现随机移动"故障"，因为如果我将其移回第四，无论如何它都应该锁定在网格上。这是我的代码（很抱歉缺少注释和奇怪的放置，我只是在测试代码）：

主类：

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JFrame;
public class WhyOhWhy {
public int x;
public int y;
public static void main(String[] args) {
    JFrame f = new JFrame();
    InputHandler input = new InputHandler();
    f.add(input);
    f.setVisible(true);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setSize(800,600);
    input.doStuff();
    }
}

输入处理程序类：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class InputHandler extends JPanel implements ActionListener, KeyListener {
Timer t = new Timer(5, this);
int x = 0, y = 0, velX = 0, velY = 0;
int i = 0, j = 0;
TimeKeeper timeStart;

public void doStuff(){
    velX = 0;
    velY = 0;
}
public InputHandler() {
    t.start();
    addKeyListener(this);
    setFocusable(true);
    setFocusTraversalKeysEnabled(false);
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    g2.fill(new Ellipse2D.Double(x, y, 32, 32));
    for(int i = 0;i <500;i+=32){
        g2.drawRect(i, j, 32, 32);
        for(int j=0;j<500;j+=32){
            g2.drawRect(i, j, 32, 32);
        }
    }
}
public void actionPerformed(ActionEvent e) {
    repaint();
    x += velX;
    y += velY;
    if(TimeKeeper.isFinished() == true){
        System.out.println("DONE");
        TimeKeeper.resetTimer(false);
        velX = 0;
        velY = 0;
        setEnabled(true);
    }
}
public void up() {
    //System.out.println("Moving up");
    timeStart = new TimeKeeper(185);
    velY = -1;
    velX = 0;
    setEnabled(false);
}
public void down() {
    //System.out.println("Moving down");
    setEnabled(false);
    timeStart = new TimeKeeper(185);
    velY = 1;
    velX = 0;
}
public void left() {
    //System.out.println("Moving left");
    setEnabled(false);
    timeStart = new TimeKeeper(185);
    velY = 0;
    velX = -1;
}
public void right() {
    //System.out.println("Moving right");
    setEnabled(false);
    timeStart = new TimeKeeper(185);
    velY = 0;
    velX = 1;
}
public void keyPressed(KeyEvent e) {
    int code = e.getKeyCode();
    if (code == KeyEvent.VK_W) {
        up();
        }
    if (code == KeyEvent.VK_S) {   
        down();
        }
    if (code == KeyEvent.VK_A) {
        left();
        }
    if (code == KeyEvent.VK_D) {
        right();
        }
    }
public void keyTyped(KeyEvent e) {
    }
public void keyReleased(KeyEvent e) {
    velX = 0;
    velY = 0;
    }
}

计时员类：

import java.util.Timer;
import java.util.TimerTask;
public class TimeKeeper {
Timer timer;
public static boolean isDone = false;
public TimeKeeper(int seconds) {
    timer = new Timer();
    isDone = false;
    timer.schedule(new RemindTask(), seconds );
}
class RemindTask extends TimerTask {
    public void run() {
        //System.out.println("Time's up!");
        isDone = true;
        timer.cancel(); //Terminate the timer thread
    }
}
public static boolean isFinished() {
    return isDone;
}
public static void resetTimer(boolean done) {
    isDone = done;
}
}

谢谢！

Answer 1

没

关系，想通了。需要使用 % 运算符来查看形状移动的数字在 x 和 y 方向上每步是否可以被 32 整除。