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JavaScript

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HTML 

              
                <script type='application/processing' target='processing'>
 float framerate = 24; // our "sketch" will have a framerate of 24 frames per second.
  
 PImage pumpkin;

 int ball_x;           // ball administration: x coordinate
 int ball_y;           // ball administration: y coordinate
 int ball_radius = 300; // ball administration: ball radius

 void setup() {
   size(680,680);        // set draw area size
   frameRate(framerate); // set animation framerate
   ball_x = 50;     // set the initial ball coordinates
   ball_y = ball_radius; // set the initial ball coordinates
   stroke(#003300);      // set the default shape outline colour
   fill(#0000FF);        // set the default shape fill colour
   pumpkin = loadImage("https://cdn.hackernoon.com/images/6sWrtbrOmsOIbrWzrG88lYfV4ch1-uwb3qrq.png")
 }

 void draw() {
   // compute the ball height for this frame
   float bounce_height = height/2 * abs(sin(PI*frameCount/framerate));
   // because the top of the screen is 0, and the bottom is "height",
   float ball_height = height - (bounce_height+ball_radius);
   // clear the drawing area
   //   background(#FFFFEE);
   // set the new ball y position
   ball_y = (int) (ball_height);
   // draw the ball
   if (ball_y >= 300) {
     background(
       random(255),
       random(255),
       random(255)
     )
   } 
   image(pumpkin, ball_x,ball_y);
 }
</script>

<canvas id='processing'></canvas>
<div><h1>bouncing pumpkin</h1></div>
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CSS
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JS
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999px

Console