発散と吸収 - OpenProcessing

mySketch
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let vecLocation = [];
let vecVelocity = [];
let hit = [];
let colorr = [];
let colorg = [];
let colorb = [];
let diameter = [];
let NUM = 1000;
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  frameRate(60);
  for(let i = 0; i <= NUM+1; i++){
    vecLocation[i] = createVector(width/2, height/2);
    vecVelocity[i] = createVector(random(-5, 5), random(-5, 5));
    hit[i] = 1;
    colorr[i] = random(0, 127);
    colorg[i] = random(0, 255);
    colorb[i] = random(127, 255);
    diameter[i] = random(5, 15);
  }
  vecLocation[NUM] = createVector(0, height);
  vecVelocity[NUM] = createVector(10, 20);
  vecLocation[NUM+1] = createVector(width, 0);
  vecVelocity[NUM+1] = createVector(-12, 17);
}
​
function draw() {
  background(0, 0, 45);
  noStroke();
  for(let i= 0; i <= NUM+1; i++){
    if(i == NUM){
        fill(243, 152, 0, 255);
        ellipse(vecLocation[i].x, vecLocation[i].y, 100, 100);      
    }else if(i == NUM+1){
        fill(152, 243, 0, 255);
        ellipse(vecLocation[i].x, vecLocation[i].y, 100, 100); 
    }else{
      if(hit[i] == 1){
        fill(colorr[i], colorg[i], colorb[i], 200);
        ellipse(vecLocation[i].x, vecLocation[i].y, diameter[i], diameter[i]);
      }      
    }
    vecLocation[i].add(vecVelocity[i]);
    if(vecLocation[i].x > width || vecLocation[i].x < 0){
      vecVelocity[i].x = vecVelocity[i].x * -1;
    }
    if(vecLocation[i].y > height || vecLocation[i].y < 0){
      vecVelocity[i].y = vecVelocity[i].y * -1;
    }
  }
  for(let i= 0; i < NUM; i++){
    if(hit[i] == 1){
      if(pow(vecLocation[i].x-vecLocation[NUM].x, 2) +
          pow(vecLocation[i].y-vecLocation[NUM].y, 2) <= 2500){
        vecVelocity[i] = createVector(random(-10, 10), random(-10, 10));
        hit[i] = 0;
      }
      if(pow(vecLocation[i].x-vecLocation[NUM+1].x, 2) +
          pow(vecLocation[i].y-vecLocation[NUM+1].y, 2) <= 2500){
        vecVelocity[i] = createVector(random(-10, 10), random(-10, 10));
        hit[i] = 0;
      }       
    }
  }
  if(pow(vecLocation[NUM].x-vecLocation[NUM+1].x, 2) +
          pow(vecLocation[NUM].y-vecLocation[NUM+1].y, 2) <= 2500){
    for(let i = 0; i < NUM; i++){
      hit[i] = 1;
    }
  }
}