svg_tutorial/svg_example.html at master · kylehill/svg_tutorial · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <style>
      * {
        -webkit-transition: all .5s linear;
        transition: all .5s linear;
      }

    </style>
  </head>
  <body>
    <div style="border:solid 1px black; width:300px; height:300px; margin:0px auto;">
      <svg id="blake">
        <circle cx="150" cy="150" r="2" fill="red" />
        <circle cx="150" cy="100" r="2" fill="red" />
        <circle cx="200" cy="150" r="2" fill="red" />
      </svg>
    </div>
    <script>
      var makeWedge = function(arcRadius, startX, startY, degreeFrom, degreeTo) {

        var pointOnPerimeter = function(degree) {
          var x = startX + (arcRadius * Math.cos(Math.PI * degree/180));
          var y = startY + (arcRadius * Math.sin(Math.PI * degree/180));
          return [x, y].join(" ");
        }

        var d = ["M", startX, startY].join(" ");
        d += [" L", pointOnPerimeter(degreeFrom) ].join(" ");
        return d + [" A", arcRadius, arcRadius, 0, (Math.abs(degreeTo - degreeFrom) > 180 ? 1 : 0), 1, pointOnPerimeter(degreeTo), "Z"].join(" ");
      }

      // document.createElementNS(ns, "tag")
      // element.setAttributeNS(null, "attribute", "value")
      var ns = "http://www.w3.org/2000/svg";

      var svg = document.getElementById("blake");

      var path = document.createElementNS(ns, "path");
      path.setAttributeNS(null, "stroke", "none");
      path.setAttributeNS(null, "fill", "lime");
      path.setAttributeNS(null, "d", makeWedge(50, 150, 150, 0, 90))
      path.setAttributeNS(null, "transform", "rotate(-90, 150, 150)")

      svg.appendChild(path);

    </script>
  </body>
</html>