使用javascript/html画布跟随摄像机进行游戏

我想用socket.io和html/canvas制作一个类似io的游戏 但我不能让相机跟随播放器，我在互联网上也找不到任何简单的解决方案 如果可以的话，我想告诉我它是如何工作的，我的代码出了什么问题

---

谢谢。

使用codepen进行了几次测试后，我自己解决了自己的问题

    frameUpdate = ()=>{
        canvas = $("canvas")[0]
        c = canvas.getContext('2d')
        c.resetTransform()
        c.clearRect(0, 0, canvas.width, canvas.height);
        LocalPlayer.Move();//if player press arrow keys, changes X any Y values of local player

        c.translate(LocalPlayer.X - (canvas.width/2), LocalPlayer.Y - (canvas.height/2));//not works

        LocalPlayer.Update();//draws Local Player at own X and Y position to canvas
        PList.Update();//draws other players at own X and Y position to canvas


       if (LocalPlayer) {socket.emit('sendplayer',LocalPlayer);}//sends LocalPlayer's data to server
        requestAnimationFrame(frameUpdate)
    }
    requestAnimationFrame(frameUpdate)

function update() {
  c.save();
  camerax = (canvas.width/2)-(playerx);
  cameray = (canvas.height/2)-(playery);
  mtt.innerText = "Camera Position:"+camerax+","+cameray+"\nPlayer Position:"+playerx+","+playery+"\nCanvas:"+canvas.width+","+canvas.height+"\n";
  c.clearRect(0, 0, canvas.width, canvas.height);
  c.translate(camerax, cameray);

   c.fillStyle = 'green';
  c.fillRect(playerx-25, playery-25, 50, 50);
  c.restore();

  requestAnimationFrame(update);
}
requestAnimationFrame(update);