Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                .wrap
  .square
              
            
!

CSS

              
                .wrap {
  position: relative;
}
.square {
  top: 0;
  left: 0;
  position: absolute;
  background-color: orange;
  width: 50px;
  height: 50px;
}
              
            
!

JS

              
                const secondPerFrame = 16.66666666;//1フレーム何ミリ秒にするか
const FPS = 1000 / secondPerFrame;
//そして、毎秒何フレームを表示するか: 約60フレーム = 60FPS
//この変数は下の関数では使ってません。一応参考で用意しました。

let animation = ($el) => {
  let leftPos = 0;//箱のポジション値を保存
  let goalVal = 1000;//最終的にいてほしいポジション
  let duration = 1000;//適当に決めたトータル秒
  let elapsedTime = 0;//経過した時間(秒)を保存
  
  //1コマの関数(1フレームで行われる処理がこの関数に書いてある)
  let tick = () => {
    
    if(elapsedTime >= duration) {//1秒たったら終わり
      leftPos = goalVal;
      $el.css('left',leftPos);
      return;//アニメーション終了
    }
    
    let elapsedTimeRate = elapsedTime / duration;
    //経過時間割合(進捗率) 〜 どれくらい時間が経過したか?
    
    let valueChangeRate = elapsedTimeRate;
    //値の変化割合 〜 とりあえず経過時間割合と同じに
    //これがイージング。例えば2乗したり3乗したり。。
    
    leftPos = goalVal * valueChangeRate;
    //値の変化割合に『最終目的値』をかけると、1フレーム後にいてほしい場所が出る
    
    $el.css('left', leftPos);
    elapsedTime += secondPerFrame;
    //1フレーム分の時間を進める
    
    setTimeout(tick, secondPerFrame);
    //以後、ずっとこれの繰り返し。。。
  }
  
  tick();//アニメーション開始!
}

$(function(){
  $('.square').on('click', function(){
    animation($(this));
  });  
});


              
            
!
999px

Console