p5.js中两个不同形状物体的碰撞检测

我试图让我的粒子对象碰撞并反射到我的板岩对象上。

如果我想用一个椭圆,它会很简单,因为我可以创建一个半径变量-不能用一个矩形。

这和距离变量有关,我就是搞不懂。

var div;
var movers;


function setup() {
  createCanvas(windowWidth,windowHeight);
  background("#FDEDEB");
  div = new Slate();
  movers = new Particle();
}

function draw() {

  background("#FDEDEB");

  div.display();

  movers.display();
  movers.update();
  movers.move();

  if (movers.hits(div)) {
    console.log("hit");
  }

}


function Slate() {

  this.x = 30;
  this.y = height/2;

  this.display = function() {
  noStroke();
  fill("#DF4655");
  rect(this.x,this.y, 700, 200);

  }
}

function Particle() {
  this.pos = createVector(10,0);
  this.vel = createVector(0,0);
  this.acc = createVector(0.01,0.01);
  this.history = [];

  this.display = function() {
    fill("#DF4655");
    point(this.pos.x,this.pos.y);

    //beginShape();
    for(var j = 0; j < this.history.length; j++) {
      var pos = this.history[j];
      ellipse(pos.x,pos.y, 5, 3);
    }
    //endShape();

  }

  this.update = function() {

    var v = createVector(this.pos.x,this.pos.y);
    this.history.push(v);
    if (this.history.length > 10) {
      this.history.splice(0,1);
    }
  }

  this.hits = function(div) {
        // BOUNCE OFF SLATE
      var d = dist(this.pos.x,this.pos.y,div.x,div.y);
      if (d < 0) {
        console.log('hits');
      }
  }


  this.move = function() {

    this.pos.add(this.vel);
    this.vel.add(this.acc);
    this.vel.limit(10);

    for (var i = 0; i < this.history.length; i++) {
      this.history[i].x += random(-2,2);
      this.history[i].y += random(-2,2);
    }

  }
}