我如何为p5.js写一行代码，作为我的播放器的相机跟随者？(var Mover)这是一个2D游戏

var player;
var cameraPosition;

function setup() {
  createCanvas(800, 600);
  
  // 创建一个玩家对象
  player = new Mover(width/2, height/2);
  
  // 初始化相机位置
  cameraPosition = createVector(0, 0);
}

function draw() {
  background(220);
  
  // 将画布移动到相机位置
  translate(-cameraPosition.x, -cameraPosition.y);
  
  // 更新和显示玩家
  player.update();
  player.display();
  
  // 更新相机位置，使其跟随玩家
  cameraPosition.x = player.position.x;
  cameraPosition.y = player.position.y;
}

// 玩家对象
function Mover(x, y) {
  this.position = createVector(x, y);
  this.velocity = createVector(0, 0);
  
  this.update = function() {
    // 根据按键输入更新玩家位置
    if (keyIsDown(UP_ARROW)) {
      this.position.y -= 5;
    }
    if (keyIsDown(DOWN_ARROW)) {
      this.position.y += 5;
    }
    if (keyIsDown(LEFT_ARROW)) {
      this.position.x -= 5;
    }
    if (keyIsDown(RIGHT_ARROW)) {
      this.position.x += 5;
    }
  };
  
  this.display = function() {
    // 绘制玩家
    fill(255, 0, 0);
    ellipse(this.position.x, this.position.y, 50, 50);
  };
}