Spinning Ovals

forked from anonymous's block: fresh block

forked from anonymous's block: Spinning Ovals

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .stop-left {
      stop-color: RGBA(0, 192, 191, 0.5);  /* Indigo */
    }

.stop-right {
      stop-color: RGBA(44, 161, 252, 0.5);  /* Teal */
    }
    .outlined {
      fill:   none;
      stroke: url(#mainGradient);
      stroke-width: 25;
    }
    
  </style>
</head>

<body>
  <script>
    var width = 960,
        height = 500;
    
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
    
    var svgDefs = svg.append('defs');
    
    var mainGradient = svgDefs.append('linearGradient')
    	.attr('id', 'mainGradient');

// Create the stops of the main gradient. Each stop will be assigned
    // a class to style the stop using CSS.
    mainGradient.append('stop')
      .attr('class', 'stop-left')
      .attr('offset', '0');

mainGradient.append('stop')
      .attr('class', 'stop-right')
      .attr('offset', '1');
    
    var oval1 = svg.append("ellipse")
    	.classed("outlined", true)
      .attr("cx", width / 2)
      .attr("cy", height / 2)
      .attr("rx", 110)
      .attr("ry", 100);

var oval2 = svg.append("ellipse")
    	.classed("outlined", true)
      .attr("cx", width / 2)
      .attr("cy", height / 2)
      .attr("rx", 110)
      .attr("ry", 100);
    
    d3.timer(function (elapsed) {
      var speed = 1500,
          offset = 75,
          omega1 = elapsed % speed / speed * 360,
          omega2 = elapsed % speed / speed * 360 - offset;
      oval1.attr("transform", "rotate(" + omega1 + "," + width/2 + "," + height/2  + ")")
      oval2.attr("transform", "rotate(" + omega2 + "," + width/2 + "," + height/2  + ")")
    })
	
    
  </script>
</body>

https://d3js.org/d3.v4.min.js