Random Walker

let ball = {

  x: 0,

  y: 0,

  radius: 5,

  speed: 1

}

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function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(60);

  //初期設定

  ball.x = random(width);

  ball.y = random(height);

  ball.radius = 4;

  ball.speed = 1000;

  background(0);

}

​

function draw() {

  //くりかえす(スピードアップ)

  for (let i = 0; i < ball.speed; i++) {

    //移動

    ball.x += random(-1, 1);

    ball.y += random(-1, 1);

    //画面の端にきたら反対側へ

    if (ball.x > width) {

      ball.x = 0;

    }

    if (ball.x < 0) {

      ball.x = width;

    }

    if (ball.y > height) {

      ball.y = 0;

    }

    if (ball.y < 0) {

      ball.y = height;

    }

    //円を描く

    noStroke();

    fill(255, 3);

    circle(ball.x, ball.y, ball.radius);

  }

}

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