如何在P5中将反弹压缩动画添加到球？

let ball;

function setup() {
  createCanvas(400, 400);
  ball = {
    x: width / 2,
    y: height / 2,
    radius: 20,
    speedX: 2,
    speedY: 2,
    color: 'red'
  };
}

function draw() {
  background(220);
  
  // 绘制球
  fill(ball.color);
  ellipse(ball.x, ball.y, ball.radius * 2);
  
  // 更新球的位置
  ball.x += ball.speedX;
  ball.y += ball.speedY;
  
  // 反弹效果
  if (ball.x + ball.radius >= width || ball.x - ball.radius <= 0) {
    ball.speedX *= -1;
  }
  if (ball.y + ball.radius >= height || ball.y - ball.radius <= 0) {
    ball.speedY *= -1;
  }
  
  // 压缩动画效果
  if (ball.x + ball.radius >= width || ball.x - ball.radius <= 0 || ball.y + ball.radius >= height || ball.y - ball.radius <= 0) {
    ball.radius *= 0.9;
  }
}