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<title>Flot Examples: Tracking</title>
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<script language="javascript" type="text/javascript" src="../../source/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" }
], {
legend: {
show: true
},
series: {
lines: {
show: true,
lineWidth: 2
}
},
crosshair: {
mode: "xy"
},
grid: {
hoverable: true,
clickable: true,
autoHighlight: false
},
yaxis: {
min: -1.2,
max: 1.2
}
});
var legends = $("#placeholder .legendLayer text tspan");
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);
}
}).bind("plotclick", function (event, pos, item) {
plot.lockCrosshair(pos);
});;
// Add the Flot version string to the footer
$("#footer").prepend("Flot " + $.plot.version + " – ");
});
</script>
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<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>
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Copyright © 2007 - 2014 IOLA and Ole Laursen
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