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Commit 9b08e820 authored by olau@iola.dk's avatar olau@iola.dk
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Added documentation and example for the crosshairs feature 

git-svn-id: https://flot.googlecode.com/svn/trunk@116 1e0a6537-2640-0410-bfb7-f154510ff394
parent 0b135a26
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API.txt
View file @ 9b08e820
......@@ -334,7 +334,8 @@ pretend trick described above. But you can fix up the timestamps by
adding the time zone offset, e.g. for UTC+0200 you would add 2 hours
to the UTC timestamp you got. Then it'll look right on the plot. Most
programming environments have some means of getting the timezone
offset for a specific date.
offset for a specific date (note that you need to get the offset for
each individual timestamp to account for daylight savings).
Once you've got the timestamps into the data and specified "time" as
the axis mode, Flot will automatically generate relevant ticks and
......@@ -614,6 +615,25 @@ like this:
// and y2axis if present
});
The "plotselected" event is only fired when the user has finished
making the selection. A "plotselecting" event is fired during the
process with the same parameters as the "plotselected" event, in case
you want to know what's happening while it's happening,
Customizing the crosshair
=========================
crosshair: {
mode: null or "x" or "y" or "xy"
color: color
}
You can enable crosshairs, thin lines, that follow the mouse by
setting the mode to one of "x", "y" or "xy". The "x" mode enables a
vertical crosshair that lets you trace the values on the x axis, "y"
enables a horizontal crosshair and "xy" enables them both.
Plot Methods
------------
......@@ -621,11 +641,6 @@ Plot Methods
The Plot object returned from the plot function has some methods you
can call:
- clearSelection()
Clear the selection rectangle.
- setSelection(ranges, preventEvent)
Set the selection rectangle. The passed in ranges is on the same
......@@ -642,6 +657,25 @@ can call:
"plotselected" handler, pass true as the second parameter.
- clearSelection()
Clear the selection rectangle.
- setCrosshair(pos)
Set the position of the crosshair. Note that this is cleared if
the user moves the mouse. "pos" should be on the form { x: xpos,
y: ypos } (or x2 and y2 if you're using the secondary axes), which
is coincidentally the same format as what you get from a "plothover"
event. If "pos" is null, the crosshair is cleared.
- clearCrosshair()
Clear the crosshair.
- highlight(series, datapoint)
Highlight a specific datapoint in the data series. You can either
......
NEWS.txt
View file @ 9b08e820
Flot 0.x
--------
New features:
Changes:
- Added support for disabling interactivity for specific data series
(request from Ronald Schouten and Steve Upton).
......@@ -13,6 +13,17 @@ New features:
passed in so you can specify DOM elements or CSS expressions to make
it easier to use Flot with libraries like Prototype or Mootools.
- A new "plotselecting" event is now emitted while the user is making
selection.
- Added a new crosshairs feature for tracing the mouse position on the
axes, enable with crosshair { mode: "x"} (see the new tracking
example for a use).
- The "plothover" event is now emitted immediately instead of at most
10 times per second, you'll have to put in a setTimeout yourself if
you're doing something really expensive on this event.
Bug fixes:
- Fixed two corner-case bugs when drawing filled curves (report and
......
examples/tracking.html 0 → 100644
View file @ 9b08e820
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Flot Examples</title>
<link href="layout.css" rel="stylesheet" type="text/css"></link>
<!--[if IE]><script language="javascript" type="text/javascript" src="../excanvas.pack.js"></script><![endif]-->
<script language="javascript" type="text/javascript" src="../jquery.js"></script>
<script language="javascript" type="text/javascript" src="../jquery.flot.js"></script>
</head>
<body>
<h1>Flot Examples</h1>
<div id="placeholder" style="width:600px;height:300px"></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.</p>
<p id="hoverdata"></p>
<script id="source" language="javascript" 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)]);
}
var plot = $.plot($("#placeholder"),
[ { data: sin, label: "sin(x)"}, { data: cos, label: "cos(x)" } ],
{ 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() + 30);
});
$("#placeholder").bind("plothover", function (event, pos, item) {
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 + " = " + y.toFixed(2));
}
});
});
</script>
</body>
</html>
jquery.flot.js
View file @ 9b08e820
......@@ -364,7 +364,8 @@
eventHolder = $([overlay, canvas]);
// bind events
if (options.selection.mode != null || options.grid.hoverable) {
if (options.selection.mode != null || options.crosshair.mode != null
|| options.grid.hoverable) {
// FIXME: temp. work-around until jQuery bug 1871 is fixed
eventHolder.each(function () {
this.onmousemove = onMouseMove;
......@@ -1679,15 +1680,15 @@
function (s) { return s["hoverable"] != false; });
if (options.crosshair.mode != null) {
setPositionFromEvent(crosshair.pos, e);
setPositionFromEvent(crosshair.pos, lastMousePos);
triggerRedrawOverlay();
}
if (selection.active) {
target.trigger("plotselecting", [ selectionIsSane() ? getSelectionForEvent() : null ]);
updateSelection(lastMousePos);
crosshair.pos.x = -1; // hide the crosshair while selecting
updateSelection(lastMousePos);
}
}
......@@ -1732,6 +1733,18 @@
function (s) { return s["clickable"] != false; });
}
/*
function userPositionInCanvasSpace(pos) {
return { x: parseInt(pos.x != null ? axes.xaxis.p2c(pos.x) : axes.x2axis.p2c(pos.x2)),
y: parseInt(pos.y != null ? axes.yaxis.p2c(pos.y) : axes.y2axis.p2c(pos.y2)) };
}
function positionInDivSpace(pos) {
var cpos = userPositionInCanvasSpace(pos);
return { x: cpos.x + plotOffset.left,
y: cpos.y + plotOffset.top };
}*/
// trigger click or hover event (they send the same parameters
// so we share their code)
function triggerClickHoverEvent(eventname, event, seriesFilter) {
......@@ -1755,8 +1768,6 @@
// fill in mouse pos for any listeners out there
item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left);
item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top);
}
if (options.grid.autoHighlight) {
......@@ -1819,10 +1830,18 @@
octx.strokeStyle = parseColor(options.crosshair.color).scale(null, null, null, 0.8).toString();
octx.lineWidth = 1;
ctx.lineJoin = "round";
var pos = crosshair.pos;
var pos = crosshair.pos,
extend = options.crosshair.extendBeyondGrid;
octx.beginPath();
octx.moveTo(pos.x, options.crosshair.extendBeyondGrid ? -plotOffset.top : 0);
octx.lineTo(pos.x, options.crosshair.extendBeyondGrid ? canvasHeight - plotOffset.top : plotHeight);
if (options.crosshair.mode.indexOf("x") != -1) {
octx.moveTo(pos.x, extend ? -plotOffset.top : 0);
octx.lineTo(pos.x, extend ? canvasHeight - plotOffset.top : plotHeight);
}
if (options.crosshair.mode.indexOf("y") != -1) {
octx.moveTo(extend ? -plotOffset.left : 0, pos.y);
octx.lineTo(extend ? canvasWidth - plotOffset.left : plotWidth, pos.y);
}
octx.stroke();
}
......
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