Java 游戏动作执行题

Question

大家好，最近我做了一个类似于涂鸦跳跃的游戏，jumper/object 跳到上面的下一个平台，如果你摔倒了，你就输了。所以无论如何我的游戏都可以运行，但有一个问题，我已经做到了，如果你按下 space 条，jumper/object 就会跳起来，好的，问题来了：如果你一直按住space bar 然后跳线会一直向上移动，直到我松开 space bar，你是怎么做到的，当你按住 space bar 时 jumper/object 只跳跃而不是继续上升直到我放开 space 条？

这是我的代码中发生的事情：

这是我执行的动作class跳线向上或向下跳动的地方

static boolean gameplay=false;
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub

    if (gameplay==true){
        if (jumper==true){
            DoodleHeight+20;
        }
        if (jumper==false){
            DoodleHeight=DoodleHeight-10;
        }

这里有控制跳跃的按键

public void keyPressed(KeyEvent e) {
    // TODO Auto-generated method stub
    if (e.getKeyCode()==KeyEvent.VK_SPACE){
        jumper=true;
    }   
}
@Override
public void keyReleased(KeyEvent e) {
    // TODO Auto-generated method stub
    if (e.getKeyCode()==KeyEvent.VK_SPACE){
        jumper=false;
    }
}

你会如何解决这个问题？我需要帮助，但我想不通。

这是我的带有标志的代码：

import java.awt.event.*;
import java.awt.*;
import java.util.Scanner;

import javax.swing.*;
public class DoodleJumpp extends JPanel implements ActionListener,KeyListener{
static JFrame f;
static int width=1200, height=930;
static int DoodleW=500, DoodleH=500;
static int DoodlePlatformWidth=200, DoodlePlatformHeight=400;
static int DoodlePlatformWidth1=400, DoodlePlatformHeight1=530;
static int DoodlePlatformWidth2=900, DoodlePlatformHeight2=874;
static int DoodlePlatformWidth3=345, DoodlePlatformHeight3=643;
static int DoodlePlatformWidth4=711, DoodlePlatformHeight4=957;
static boolean rightjumper,leftjumper;
static boolean jumper;
static boolean test=true;
static boolean gameplay=true;
public void paintComponent (Graphics g){
    g.setColor(Color.green);
    g.fillRect(DoodlePlatformWidth, DoodlePlatformHeight,200,30);
    g.fillRect( DoodlePlatformWidth1, DoodlePlatformHeight1,200,30);
    g.fillRect( DoodlePlatformWidth2, DoodlePlatformHeight2,200,30);
    g.fillRect( DoodlePlatformWidth3, DoodlePlatformHeight3,200,30);
    g.fillRect( DoodlePlatformWidth4, DoodlePlatformHeight4,200,30);
    g.setColor(Color.blue);
    g.fillRect(DoodleW, DoodleH,50,50);
}
public static void main(String a[]){
    DoodleJumpp D = new DoodleJumpp();
    f = new JFrame();
    D.init();
    f.add(D);
    f.setSize(width,height);
    f.setVisible(true);
    f.repaint();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Timer t=new Timer(10,D);
    t.start();
}
public void init (){
    this.addKeyListener(this);
    setFocusable(true);
}
@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    if (gameplay==true){
        if (jumper==true&&test==false){
            DoodlePlatformHeight=DoodlePlatformHeight+20;
            DoodlePlatformHeight1=DoodlePlatformHeight1+20;
            DoodlePlatformHeight2=DoodlePlatformHeight2+20;
            DoodlePlatformHeight3=DoodlePlatformHeight3+20;
            DoodlePlatformHeight4=DoodlePlatformHeight4+20;
        }
        if (jumper==false&&test==false){
            DoodlePlatformHeight=DoodlePlatformHeight-10;
            DoodlePlatformHeight1=DoodlePlatformHeight1-10;
            DoodlePlatformHeight2=DoodlePlatformHeight2-10;
            DoodlePlatformHeight3=DoodlePlatformHeight3-10;
            DoodlePlatformHeight4=DoodlePlatformHeight4-10;
        }
        if (leftjumper==true&&test==false){
            DoodleW=(DoodleW-15);
        }
        if (rightjumper==true&&test==false){
            DoodleW=(DoodleW+15);
        }
        if (DoodlePlatformHeight>height){
            DoodlePlatformWidth=(int) Math.floor(Math.random()*1201);
            DoodlePlatformHeight=0;
        }
        if (DoodlePlatformHeight1>height){
            DoodlePlatformWidth1=(int) Math.floor(Math.random()*1201);
            DoodlePlatformHeight1=0;
        }
        if (DoodlePlatformHeight2>height){
            DoodlePlatformWidth2=(int) Math.floor(Math.random()*1201);
            DoodlePlatformHeight2=0;
        }
        if (DoodlePlatformHeight3>height){
            DoodlePlatformWidth3=(int) Math.floor(Math.random()*1201);
            DoodlePlatformHeight3=0;
        }
        if (DoodlePlatformHeight4>height){
            DoodlePlatformWidth4=(int) Math.floor(Math.random()*1201);
            DoodlePlatformHeight4=0;
        }
        if (DoodleH==DoodlePlatformHeight-50 && DoodleW>=DoodlePlatformWidth-30  && DoodleW<=DoodlePlatformWidth+180){
            test=true;
        }
        if (DoodleH==DoodlePlatformHeight1-50 && DoodleW>=DoodlePlatformWidth1-30  && DoodleW<=DoodlePlatformWidth1+180){
            test=true;
        }
        if (DoodleH==DoodlePlatformHeight2-50 && DoodleW>=DoodlePlatformWidth2-30  && DoodleW<=DoodlePlatformWidth2+180){
            test=true;
        }
        if (DoodleH==DoodlePlatformHeight3-50 && DoodleW>=DoodlePlatformWidth3-30  && DoodleW<=DoodlePlatformWidth3+180){
            test=true;
        }
        if (DoodleH==DoodlePlatformHeight4-50 && DoodleW>=DoodlePlatformWidth4-30  && DoodleW<=DoodlePlatformWidth4+180){
            test=true;
        }
        f.repaint();
    }
}
static boolean flag=true;
@Override
public void keyTyped(KeyEvent e) {
    // TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
    // TODO Auto-generated method stub
    if (e.getKeyCode()==KeyEvent.VK_SPACE && flag == true){
        flag = false;
        jumper=true;
        test=false;
    }  
    if (e.getKeyCode()==KeyEvent.VK_A){
        leftjumper=true;
    }
    if (e.getKeyCode()==KeyEvent.VK_D){
        rightjumper=true;
    }
}
@Override
public void keyReleased(KeyEvent e) {
    // TODO Auto-generated method stub
    if (e.getKeyCode()==KeyEvent.VK_SPACE){
        flag = true;
        jumper=false;

    }
    if (e.getKeyCode()==KeyEvent.VK_A){
        leftjumper=false;

    }
    if (e.getKeyCode()==KeyEvent.VK_D){
        rightjumper=false;
    }
}
}

Answer 1

好吧，您可以在 keyReleased 和 keyPressed 代码之间共享一个布尔变量。当按下键时，将值设置为 false，然后将其作为条件添加到您的 keyPressed 代码中，这样当标志为 false 时，它不会执行任何操作。与您的 keyReleased 代码类似，再次将标志设置为 true，以便 keyPressed 代码再次运行。

因此，通过这些修改，您的代码将变为：

static boolean flag = true;//<- your flag
public void keyPressed(KeyEvent e) {
    if (e.getKeyCode()==KeyEvent.VK_SPACE && flag == true){//<- only jump if the flag is true
        flag = false;//<-- set flag to false, this will be reset by the keyReleased code again
        jumper=true;
    }   
}
@Override
public void keyReleased(KeyEvent e) {
    if (e.getKeyCode()==KeyEvent.VK_SPACE){
        flag = true;//<-- reset flag to be able to jump again
        jumper=false;
    }
}

希望对您有所帮助:)

编辑 #1

第 2 版仍然有效，但您可能希望在登陆平台时重置标志，否则用户可以向 space 栏发送垃圾邮件。

@Override
public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub
if (e.getKeyCode()==KeyEvent.VK_SPACE && flag == true){
    flag = false;
    jumper=true;
    test=false;
}else{
    jumper=false;
}
if (e.getKeyCode()==KeyEvent.VK_A){
    leftjumper=true;
}
if (e.getKeyCode()==KeyEvent.VK_D){
    rightjumper=true;
}
}
@Override
public void keyReleased(KeyEvent e) {

// TODO Auto-generated method stub
if (e.getKeyCode()==KeyEvent.VK_SPACE){
    flag = true;
    jumper=false;

}
if (e.getKeyCode()==KeyEvent.VK_A){
    leftjumper=false;

}
if (e.getKeyCode()==KeyEvent.VK_D){
    rightjumper=false;
}
}

Answer 2

问题是您只有在松开按键时才会关闭角色！

特别是这个逻辑：

@Override
public void keyReleased(KeyEvent e) {
    // TODO Auto-generated method stub
    if (e.getKeyCode()==KeyEvent.VK_SPACE){
        jumper=false;
    }
}

然后在 actionPerformed 时使用此逻辑

    if (jumper==false){
        DoodleHeight=DoodleHeight-10;
    }

你需要类似于重力的东西，在一段时间后将角色降到地面

一种方法是使用 TimerTask，它在角色跳跃时立即开始，每个计时器刻度上的任务都会降低角色的高度，直到为 0 或与跳跃前相同.

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