定义取决于时间的位置函数：

Question

我正在创建一个模拟5个相互坠落的自由落球的方法。我有碰撞检测并完成了碰撞。但是我在定义典型的自由落体方程时遇到了麻烦。我尝试了很多方法，但是我的知识非常有限。我也希望获得更好的编码实践的帮助。

let bola1;
let bola2;
let bola3;
let bola4;
let bola5;

class Bola{
  constructor(y,r,v,m){
    this.x = width/2;
    this.y = y;
    this.r = r;
  	this.v = v;
  	this.m = m;
  	this.a = -10;
}
  
  veloci(){
    this.y = this.y+this.v
  }
  show(){
      ellipse(this.x, this.y, this.r,this.r);
  }
  
  reverse(){
   this.v = -this.v 
  }
  
  // floor
  piso(){    
     return (this.y >= height)
  }
  
  // collide  
  choca(other){
  	return !(this.y+this.r< other.y ||this.y> other.y+other.r) 
  }
  
  // bounce
  rebota(other) {
    let sumM = this.m + other.m;
    let newV = (this.m - other.m) / sumM * this.v;
    newV += (2 * other.m / sumM) * other.v;
    return newV;
  }
  
  display() {
      ellipse(this.x, this.y, this.diameter, this.diameter);
  }
}

function setup() {
  createCanvas(600, 500);
  bola1 = new Bola(450,50,3,1);
  bola2 = new Bola(350,50,3,1);
  bola3 = new Bola(250,50,3,1);
  bola4 = new Bola(150,50,3,1);
  bola5 = new Bola(50,50,3,1);
}

function draw() {
  background(110,20,20);
	
  // Show and update velocity for each ball
  // I would like to find a better way to handle these
  bola1.show();
  bola1.veloci();
  bola2.show();
  bola2.veloci();
  bola3.show();
  bola3.veloci();
  bola4.show();
  bola4.veloci();
  bola5.show();
  bola5.veloci();
 
  // Make the ball bounce when it hits the floor
  if (bola1.piso()) {
      bola1.reverse(); 
  }
 
  // Attempt to make balls bounce when they collide with each other
  if (bola1.choca(bola2)){
    const v1 = bola1.rebota(bola2);
    const v2 = bola2.rebota(bola1);
    bola1.v = v1;
    bola2.v = v2;
  }
  
  if (bola2.choca(bola3)){
    const v3 = bola2.rebota(bola3);
    const v4 = bola3.rebota(bola2);
    bola2.v = v3;
    bola3.v = v4;
  }
  
  if (bola3.choca(bola4)){
    const v5 = bola3.rebota(bola4);
    const v6 = bola4.rebota(bola3);
    bola3.v = v5;
    bola4.v = v6;
  }
  if (bola4.choca(bola5)){
    const v7 = bola4.rebota(bola5);
    const v8 = bola5.rebota(bola4);
    bola4.v = v7;
    bola5.v = v8;
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.7.3/p5.min.js"></script>

您还可以在此处查看代码： https://editor.p5js.org/yogurtcongelado/sketches/mxEJxtsU_

（如果您知道如何在p5中使用分隔的文件夹，因为如果尝试在班级中使用另一个文件夹，则主程序会说未定义对象）