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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Flot Examples: Tracking</title>
    <link href="../examples.css" rel="stylesheet" type="text/css" />
    <!--[if lte IE 8
      ]><script
        language="javascript"
        type="text/javascript"
        src="../../excanvas.min.js"
      ></script
    ><![endif]-->
    <script
      language="javascript"
      type="text/javascript"
      src="../../jquery.js"
    ></script>
    <script
      language="javascript"
      type="text/javascript"
      src="../../jquery.flot.js"
    ></script>
    <script
      language="javascript"
      type="text/javascript"
      src="../../jquery.flot.crosshair.js"
    ></script>
    <script type="text/javascript">
      $(function () {
        var sin = [],
          cos = [];
        for (var i = 0; i < 14; i += 0.1) {
          sin.push([i, Math.sin(i)]);
          cos.push([i, Math.cos(i)]);
        }

        plot = $.plot(
          "#placeholder",
          [
            { data: sin, label: "sin(x) = -0.00" },
            { data: cos, label: "cos(x) = -0.00" },
          ],
          {
            series: {
              lines: {
                show: true,
              },
            },
            crosshair: {
              mode: "x",
            },
            grid: {
              hoverable: true,
              autoHighlight: false,
            },
            yaxis: {
              min: -1.2,
              max: 1.2,
            },
          }
        );

        var legends = $("#placeholder .legendLabel");

        legends.each(function () {
          // fix the widths so they don't jump around
          $(this).css("width", $(this).width());
        });

        var updateLegendTimeout = null;
        var latestPosition = null;

        function updateLegend() {
          updateLegendTimeout = null;

          var pos = latestPosition;

          var axes = plot.getAxes();
          if (
            pos.x < axes.xaxis.min ||
            pos.x > axes.xaxis.max ||
            pos.y < axes.yaxis.min ||
            pos.y > axes.yaxis.max
          ) {
            return;
          }

          var i,
            j,
            dataset = plot.getData();
          for (i = 0; i < dataset.length; ++i) {
            var series = dataset[i];

            // Find the nearest points, x-wise

            for (j = 0; j < series.data.length; ++j) {
              if (series.data[j][0] > pos.x) {
                break;
              }
            }

            // Now Interpolate

            var y,
              p1 = series.data[j - 1],
              p2 = series.data[j];

            if (p1 == null) {
              y = p2[1];
            } else if (p2 == null) {
              y = p1[1];
            } else {
              y = p1[1] + ((p2[1] - p1[1]) * (pos.x - p1[0])) / (p2[0] - p1[0]);
            }

            legends
              .eq(i)
              .text(series.label.replace(/=.*/, "= " + y.toFixed(2)));
          }
        }

        $("#placeholder").bind("plothover", function (event, pos, item) {
          latestPosition = pos;
          if (!updateLegendTimeout) {
            updateLegendTimeout = setTimeout(updateLegend, 50);
          }
        });

        // Add the Flot version string to the footer

        $("#footer").prepend("Flot " + $.plot.version + " &ndash; ");
      });
    </script>
  </head>
  <body>
    <div id="header">
      <h2>Tracking</h2>
    </div>

    <div id="content">
      <div class="demo-container">
        <div id="placeholder" class="demo-placeholder"></div>
      </div>

      <p>
        You can add crosshairs that'll track the mouse position, either on both
        axes or as here on only one.
      </p>

      <p>
        If you combine it with listening on hover events, you can use it to
        track the intersection on the curves by interpolating the data points
        (look at the legend).
      </p>

      <p id="hoverdata"></p>
    </div>

    <div id="footer">Copyright &copy; 2007 - 2014 IOLA and Ole Laursen</div>
  </body>
</html>

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