随机方向 [英] Random directions

问题描述

您好，我正忙于学习 Java，我正忙于创建 pacman 游戏，但现在我需要让幽灵朝着随机"方向移动，因此这个方向必须时不时地垂直/水平改变，反之亦然

Hello I am busy with learning Java and I am busy creating a pacman game but now I need to let the ghosts move in a "Random" direction and so now and then this direction has to change vertically/horizontally and vica versa

此刻鬼从左到右，从右到左.负责这个动作的代码如下:(忽略pacman绘图部分见下文//ghost运动)

at the moment the ghost goes from left to right and right to left. the code that is responsible for this action is as follows: (ignore pacman drawing part see below //ghost movement)

    DrawPacMan pacman = new DrawPacMan();
DrawGhost ghost = new DrawGhost();

int g1x = 0;
boolean g1r = true;

public void paintComponent(Graphics g) {

    super.paintComponent(g);
    // pacman movement
    diameter = 25;   
    pacman.drawPacMan(g, getHorPlaats(), getVerPlaats(), diameter, getView(), Color.yellow);

    // ghosts movement
    g1x += ghostSpeed * (g1r? 1 : -1);

    // check direction
    if (g1x >= 500) { g1x = 500; g1r = false; }
    else if (g1x <= 0) { g1x = 0; g1r = true; }

    ghost.drawGhost(g, g1x, 40, diameter, Color.red);

}

现在我不知道如何创建随机方向或使用什么函数.有人可以给我一些提示/帮助，如果可能的话，我可以提供一个我可以进一步使用的小例子吗?如果您想查看更多代码或其他内容，请询问，我会发布 :)

Now I don't know how to create a random direction or what functions to use. Can someone give me some hints/help and if possible a little example that I can work further with? and if you want to see more code or something please ask and i'll post :)

推荐答案

对于像这样简单的事情，我会生成一个随机数，0、1、2 或 3.这将为您提供所需的所有方向: 上、下、左、右.

For something simple like this, I'd generate a random number, either 0, 1, 2, or 3. This will give you all the directions you need: up, down, left, and right.

 import java.util.Random;
 // create a random number generator
 Random randomGen = new Random();
 // generate a random number, between 0 and n-1 (0,1,2,3 in this case)
 int theRandomNumber = randomGen.nextInt(4);

 public void setRandomGhostDirection() {

     switch(theRandomNumber) {
     case 0:
         moveUp();
         break;
     case 1:
         moveLeft();
         break;
     case 2:
         moveRight();
         break;
     case 3:
         moveDown();
         break;
     }

 }

您可以通过将方向编号定义为类似的东西来清理它final int DIRECTION_UP = 0 等等

You could clean this up by defining the direction numbers as something like final int DIRECTION_UP = 0 etc.

这篇关于随机方向的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！