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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Flot Examples</title>
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<link href="layout.css" rel="stylesheet" type="text/css">
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<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../excanvas.min.js"></script><![endif]-->
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<script language="javascript" type="text/javascript" src="../jquery.js"></script>
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<script language="javascript" type="text/javascript" src="../jquery.flot.js"></script>
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</head>
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<body>
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<h1>Flot Examples</h1>
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<div id="placeholder" style="width:600px;height:300px;"></div>
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<p>With multiple axes, you sometimes need to interact with them. A
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simple way to do this is to draw the plot, deduce the axis
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placements and insert a couple of divs on top to catch events.
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Try clicking an axis.</p>
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<p id="click"></p>
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<script type="text/javascript">
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$(function () {
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function generate(start, end, fn) {
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var res = [];
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for (var i = 0; i <= 100; ++i) {
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var x = start + i / 100 * (end - start);
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res.push([x, fn(x)]);
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}
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return res;
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}
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var data = [
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{ data: generate(0, 10, function (x) { return Math.sqrt(x)}), xaxis: 1, yaxis:1 },
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{ data: generate(0, 10, function (x) { return Math.sin(x)}), xaxis: 1, yaxis:2 },
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{ data: generate(0, 10, function (x) { return Math.cos(x)}), xaxis: 1, yaxis:3 },
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{ data: generate(2, 10, function (x) { return Math.tan(x)}), xaxis: 2, yaxis: 4 }
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];
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var plot = $.plot($("#placeholder"),
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data,
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{
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xaxes: [
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{ position: 'bottom' },
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{ position: 'top'}
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],
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yaxes: [
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{ position: 'left' },
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{ position: 'left' },
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{ position: 'right' },
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{ position: 'left' }
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]
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});
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// now for each axis, create a div
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function getBoundingBoxForAxis(plot, axis) {
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var left = axis.box.left, top = axis.box.top,
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right = left + axis.box.width, bottom = top + axis.box.height;
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// some ticks may stick out, enlarge the box to encompass all ticks
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var cls = axis.direction + axis.n + 'Axis';
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plot.getPlaceholder().find('.' + cls + ' .tickLabel').each(function () {
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var pos = $(this).position();
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left = Math.min(pos.left, left);
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top = Math.min(pos.top, top);
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right = Math.max(Math.round(pos.left) + $(this).outerWidth(), right);
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bottom = Math.max(Math.round(pos.top) + $(this).outerHeight(), bottom);
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});
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return { left: left, top: top, width: right - left, height: bottom - top };
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}
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$.each(plot.getAxes(), function (i, axis) {
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if (!axis.show)
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return;
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var box = getBoundingBoxForAxis(plot, axis);
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$('<div class="axisTarget" style="position:absolute;left:' + box.left + 'px;top:' + box.top + 'px;width:' + box.width + 'px;height:' + box.height + 'px"></div>')
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.data('axis.direction', axis.direction)
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.data('axis.n', axis.n)
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.css({ backgroundColor: "#f00", opacity: 0, cursor: "pointer" })
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.appendTo(plot.getPlaceholder())
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.hover(
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function () { $(this).css({ opacity: 0.10 }) },
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function () { $(this).css({ opacity: 0 }) }
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)
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.click(function () {
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$("#click").text("You clicked the " + axis.direction + axis.n + "axis!")
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});
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});
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});
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</script>
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</body>
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</html>
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