jquery - How to create a "Simple Harmonic Oscillation" on scroll event using Javascript -


currently have element on page. object oscillate left , right similar 1 in example give below. however, bind oscillation browser window scroll event.

https://www.khanacademy.org/computer-programming/simple-harmonic-motion/4920589909229568

i tried it's not smooth , accurate:

javascript 

    let butterfly_y_position_log = [];      let scroll_times = 0;     let scroll_direction;     $(window).scroll(function(){       let butterfly_y_position = $('.floating-butterfly').offset().top;       let butterfly_x_position;       butterfly_y_position_log.push(butterfly_y_position);       if (butterfly_y_position_log.length > 2){         butterfly_y_position_log = butterfly_y_position_log.slice(1, 4);       }        if (butterfly_y_position_log[0] < butterfly_y_position_log[1] || butterfly_y_position_log[1] == undefined){         scroll_direction = 'down';         scroll_times++;         butterfly_x_position =  ($(window).width() / 2) + (100 * math.sin(2* math.pi + scroll_times));       } else {         scroll_direction = 'up';         scroll_times--;         butterfly_x_position =  ($(window).width() / 2) + (100 * math.cos(2* math.pi + scroll_times));       }       console.log(scroll_times);       console.log(butterfly_x_position);       $('.floating-butterfly').css({left:butterfly_x_position});     });

html

<img src="..." class="floating-butterfly">

css

.floating-butterfly {   position: fixed;   top: 40px;   z-index: 2; }

the y-position remain fixed, x-position change on scroll.

enter image description here


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