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<title>Flot Examples</title>
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<h1>Flot Examples</h1>
<div id="placeholder" style="width:600px;height:300px;"></div>
<p>With multiple axes, you sometimes need to interact with them. A
simple way to do this is to draw the plot, deduce the axis
placements and insert a couple of divs on top to catch events.
Try clicking an axis.</p>
<p id="click"></p>
<script id="source" language="javascript" type="text/javascript">
$(function () {
function generate(start, end, fn) {
var res = [];
for (var i = 0; i <= 100; ++i) {
var x = start + i / 100 * (end - start);
res.push([x, fn(x)]);
}
return res;
}
var data = [
{ data: generate(0, 10, function (x) { return Math.sqrt(x)}), xaxis: 1, yaxis:1 },
{ data: generate(0, 10, function (x) { return Math.sin(x)}), xaxis: 1, yaxis:2 },
{ data: generate(0, 10, function (x) { return Math.cos(x)}), xaxis: 1, yaxis:3 },
{ data: generate(2, 10, function (x) { return Math.tan(x)}), xaxis: 2, yaxis: 4 }
];
var plot = $.plot($("#placeholder"),
data,
{
xaxes: [
{ position: 'bottom' },
{ position: 'top'}
],
yaxes: [
{ position: 'left' },
{ position: 'left' },
{ position: 'right' },
{ position: 'left' }
]
});
// now for each axis, create a div
function getBoundingBoxForAxis(plot, axis) {
var left = axis.box.left, top = axis.box.top,
right = left + axis.box.width, bottom = top + axis.box.height;
// some ticks may stick out, enlarge the box to encompass all ticks
var cls = axis.direction + axis.n + 'Axis';
plot.getPlaceholder().find('.' + cls + ' .tickLabel').each(function () {
var pos = $(this).position();
left = Math.min(pos.left, left);
top = Math.min(pos.top, top);
right = Math.max(Math.round(pos.left) + $(this).outerWidth(), right);
bottom = Math.max(Math.round(pos.top) + $(this).outerHeight(), bottom);
});
return { left: left, top: top, width: right - left, height: bottom - top };
}
$.each(plot.getXAxes().concat(plot.getYAxes()), function (i, axis) {
var box = getBoundingBoxForAxis(plot, axis);
$('<div class="axisTarget" style="position:absolute;left:' + box.left + 'px;top:' + box.top + 'px;width:' + box.width + 'px;height:' + box.height + 'px"></div>')
.data('axis.direction', axis.direction)
.data('axis.n', axis.n)
.css({ backgroundColor: "#f00", opacity: 0, cursor: "pointer" })
.appendTo(plot.getPlaceholder())
.hover(
function () { $(this).css({ opacity: 0.10 }) },
function () { $(this).css({ opacity: 0 }) }
)
.click(function () {
$("#click").text("You clicked the " + axis.direction + axis.n + "axis!")
});
});
});
</script>
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