ランダムアニメ

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let veclocation=[];

let vecvelocity=[];

const NUM = 40;

function setup() {

  createCanvas(windowWidth,windowHeight);

  frameRate(100);//=60fps=frame per second

  for(let i = 0; i < NUM; i++){

 veclocation[i] = createVector(width/2, height/2);

 vecvelocity[i] = createVector(random(-10,10),random(-10, 10));

  }

}

function draw() {

  background(100,200,200);

  noStroke();

  fill(random(255), random(255), random(255), random(300));

  for(let i = 0; i < NUM; i++){

  ellipse(veclocation[i].x, veclocation[i].y, random(100), random(100));

   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;   

    } 

  }

}