蝶々

let vecLocation=[];

let vecVelocity=[];

const NUM=50;

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(20);

​

​

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

  vecLocation[i]=createVector(width/2,0);

  vecVelocity[i]=createVector(random(-10,10),random(-10,10))

  }

}

​

function draw() {

    rect(0,0,100,100);

  background(30,120,90);

  noStroke();

  fill(random(200,255),random(200,255),random(255),220);

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

  ellipse(vecLocation[i].x,vecLocation[i].y,30,random(10,60));

   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;

   }

  }

​

}