弹跳球，挣扎超过1（处理） [英] Bouncing Balls, struggling with getting more than 1 (processing)

问题描述

所以我想让10个球上下反弹。到目前为止，我设法使1个球反弹，并且具有类似重力的东西。
但是现在我想添加更多的球，但是我只是无法这样做。到目前为止，我试图添加一个数组，然后使用一个循环，但是到目前为止，我还没有尝试过。
如果有人可以向我指出解决方案，将不胜感激。

so I want to have 10 Balls bouncing up and down. So far I have managed to get 1 Ball to bounce, and to have something like gravity. But now I want to add more balls, but I just can`t manage to do so. So far I tried to add an array, and then to use a loop, but nothing I tried worked for me yet. Would appreciate if somebody could point me out to the Solution.

 Ball b; 

 void setup() {               
   size(940, 660);
   b = new Ball();
 }

 void draw() {
   background(50); 
   fill(255);

   b.display();
   b.move();
 }

以及班级：

class Ball 
{
  float circleX;
  float circleY;
  float speed;
  float gravity=0.2;

  Ball() {
   speed = 0;
   circleY = 0;
   circleX = 200;
  }

  void move() {
  speed = speed + gravity;  //gravity draufrechnen
  circleY = circleY + speed;  //mit der geschwindigkeit bewegegn
  if (circleY >= height){
    speed = -speed; //andere richtung 
    circleY = height;
    speed = speed*0.9;
  }
 }
  void display() {
    stroke(0);
    fill(127);
    ellipse(circleX, circleY, 50 , 50);
  }
}

推荐答案

创建球中的构造函数，您可以在其中传递球的初始x和y坐标：

Create a constructor in balls, where you can pass the initial x and y coordinate of a ball:

class Ball 
{
    .....    

    Ball(int x, int y) {
       speed = 0;
       circleX = x;
       circleY = y;
    }

    .....  
}

创建一个球数组并在 setup 函数中对其进行初始化：

Create an array of balls and initialize it in the setup function:

int no_of_balls = 10;
Ball[] balls = new Ball[no_of_balls];

void setup() {               

    for (int i=0; i<no_of_balls; ++i) {
        balls[i] = new Ball(80 + i*80, i*5);      
    }

    size(940, 660);
}

使用 Math.random（）：

for (int i=0; i<no_of_balls; ++i) {
    balls[i] = new Ball( 80 + i*80, (int)(Math.random()*100.0) );
}

显示和移动 绘制中的球阵列：

void draw() {
    background(50); 
    fill(255);

    for (int i=0; i<no_of_balls; ++i) {
        balls[i].display();
        balls[i].move();
    }
}

预览（按比例缩小）：

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