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API.txt → API.txt.md
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@ -1,9 +1,9 @@
Flot Reference
--------------
==============
Consider a call to the plot function:
var plot = $.plot(placeholder, data, options)
var plot = $.plot(placeholder, data, options)
The placeholder is a jQuery object or DOM element or jQuery expression
that the plot will be put into. This placeholder needs to have its
@ -28,16 +28,16 @@ Data Format
The data is an array of data series:
[ series1, series2, ... ]
[ series1, series2, ... ]
A series can either be raw data or an object with properties. The raw
data format is an array of points:
[ [x1, y1], [x2, y2], ... ]
[ [x1, y1], [x2, y2], ... ]
E.g.
[ [1, 3], [2, 14.01], [3.5, 3.14] ]
[ [1, 3], [2, 14.01], [3.5, 3.14] ]
Note that to simplify the internal logic in Flot both the x and y
values must be numbers (even if specifying time series, see below for
@ -58,28 +58,28 @@ area/bar (defaults to 0).
The format of a single series object is as follows:
{
color: color or number
data: rawdata
label: string
lines: specific lines options
bars: specific bars options
points: specific points options
xaxis: number
yaxis: number
clickable: boolean
hoverable: boolean
shadowSize: number
}
{
color: color or number
data: rawdata
label: string
lines: specific lines options
bars: specific bars options
points: specific points options
xaxis: number
yaxis: number
clickable: boolean
hoverable: boolean
shadowSize: number
}
You don't have to specify any of them except the data, the rest are
options that will get default values. Typically you'd only specify
label and data, like this:
{
label: "y = 3",
data: [[0, 3], [10, 3]]
}
{
label: "y = 3",
data: [[0, 3], [10, 3]]
}
The label is used for the legend, if you don't specify one, the series
will not show up in the legend.
@ -108,8 +108,8 @@ override the default options for the plot for that data series.
Here's a complete example of a simple data specification:
[ { label: "Foo", data: [ [10, 1], [17, -14], [30, 5] ] },
{ label: "Bar", data: [ [11, 13], [19, 11], [30, -7] ] } ]
[ { label: "Foo", data: [ [10, 1], [17, -14], [30, 5] ] },
{ label: "Bar", data: [ [11, 13], [19, 11], [30, -7] ] } ]
Plot Options
@ -118,30 +118,30 @@ Plot Options
All options are completely optional. They are documented individually
below, to change them you just specify them in an object, e.g.
var options = {
series: {
lines: { show: true },
points: { show: true }
}
};
var options = {
series: {
lines: { show: true },
points: { show: true }
}
};
$.plot(placeholder, data, options);
$.plot(placeholder, data, options);
Customizing the legend
======================
legend: {
show: boolean
labelFormatter: null or (fn: string, series object -> string)
labelBoxBorderColor: color
noColumns: number
position: "ne" or "nw" or "se" or "sw"
margin: number of pixels or [x margin, y margin]
backgroundColor: null or color
backgroundOpacity: number between 0 and 1
container: null or jQuery object/DOM element/jQuery expression
}
legend: {
show: boolean
labelFormatter: null or (fn: string, series object -> string)
labelBoxBorderColor: color
noColumns: number
position: "ne" or "nw" or "se" or "sw"
margin: number of pixels or [x margin, y margin]
backgroundColor: null or color
backgroundOpacity: number between 0 and 1
container: null or jQuery object/DOM element/jQuery expression
}
The legend is generated as a table with the data series labels and
small label boxes with the color of the series. If you want to format
@ -149,10 +149,10 @@ the labels in some way, e.g. make them to links, you can pass in a
function for "labelFormatter". Here's an example that makes them
clickable:
labelFormatter: function(label, series) {
// series is the series object for the label
return '<a href="#' + label + '">' + label + '</a>';
}
labelFormatter: function(label, series) {
// series is the series object for the label
return '<a href="#' + label + '">' + label + '</a>';
}
"noColumns" is the number of columns to divide the legend table into.
"position" specifies the overall placement of the legend within the
@ -171,36 +171,36 @@ ignored. Note that Flot will overwrite the contents of the container.
Customizing the axes
====================
xaxis, yaxis: {
show: null or true/false
position: "bottom" or "top" or "left" or "right"
mode: null or "time"
color: null or color spec
tickColor: null or color spec
font: null or font spec object
min: null or number
max: null or number
autoscaleMargin: null or number
transform: null or fn: number -> number
inverseTransform: null or fn: number -> number
ticks: null or number or ticks array or (fn: axis -> ticks array)
tickSize: number or array
minTickSize: number or array
tickFormatter: (fn: number, object -> string) or string
tickDecimals: null or number
labelWidth: null or number
labelHeight: null or number
reserveSpace: null or true
tickLength: null or number
alignTicksWithAxis: null or number
}
xaxis, yaxis: {
show: null or true/false
position: "bottom" or "top" or "left" or "right"
mode: null or "time"
color: null or color spec
tickColor: null or color spec
font: null or font spec object
min: null or number
max: null or number
autoscaleMargin: null or number
transform: null or fn: number -> number
inverseTransform: null or fn: number -> number
ticks: null or number or ticks array or (fn: axis -> ticks array)
tickSize: number or array
minTickSize: number or array
tickFormatter: (fn: number, object -> string) or string
tickDecimals: null or number
labelWidth: null or number
labelHeight: null or number
reserveSpace: null or true
tickLength: null or number
alignTicksWithAxis: null or number
}
All axes have the same kind of options. The following describes how to
configure one axis, see below for what to do if you've got more than
@ -229,13 +229,13 @@ read from the font style on the placeholder element (80% the size of
that to be precise). If you set it directly with "font: { ... }", the
format is like this:
{
size: 11,
style: "italic",
weight: "bold",
family: "sans-serif",
variant: "small-caps"
}
{
size: 11,
style: "italic",
weight: "bold",
family: "sans-serif",
variant: "small-caps"
}
The options "min"/"max" are the precise minimum/maximum value on the
scale. If you don't specify either of them, a value will automatically
@ -260,18 +260,18 @@ other means. When Flot draws the plot, each value is first put through
the transform function. Here's an example, the x axis can be turned
into a natural logarithm axis with the following code:
xaxis: {
transform: function (v) { return Math.log(v); },
inverseTransform: function (v) { return Math.exp(v); }
}
xaxis: {
transform: function (v) { return Math.log(v); },
inverseTransform: function (v) { return Math.exp(v); }
}
Similarly, for reversing the y axis so the values appear in inverse
order:
yaxis: {
transform: function (v) { return -v; },
inverseTransform: function (v) { return -v; }
}
yaxis: {
transform: function (v) { return -v; },
inverseTransform: function (v) { return -v; }
}
Note that for finding extrema, Flot assumes that the transform
function does not reorder values (it should be monotone).
@ -306,11 +306,11 @@ see the next section.
If you want to completely override the tick algorithm, you can specify
an array for "ticks", either like this:
ticks: [0, 1.2, 2.4]
ticks: [0, 1.2, 2.4]
Or like this where the labels are also customized:
ticks: [[0, "zero"], [1.2, "one mark"], [2.4, "two marks"]]
ticks: [[0, "zero"], [1.2, "one mark"], [2.4, "two marks"]]
You can mix the two if you like.
@ -320,16 +320,16 @@ min and max and should return a ticks array. Here's a simplistic tick
generator that spits out intervals of pi, suitable for use on the x
axis for trigonometric functions:
function piTickGenerator(axis) {
var res = [], i = Math.floor(axis.min / Math.PI);
do {
var v = i * Math.PI;
res.push([v, i + "\u03c0"]);
++i;
} while (v < axis.max);
return res;
}
function piTickGenerator(axis) {
var res = [], i = Math.floor(axis.min / Math.PI);
do {
var v = i * Math.PI;
res.push([v, i + "\u03c0"]);
++i;
} while (v < axis.max);
return res;
}
You can control how the ticks look like with "tickDecimals", the
number of decimals to display (default is auto-detected).
@ -339,9 +339,9 @@ provide a function to "tickFormatter". The function is passed two
parameters, the tick value and an axis object with information, and
should return a string. The default formatter looks like this:
function formatter(val, axis) {
return val.toFixed(axis.tickDecimals);
}
function formatter(val, axis) {
return val.toFixed(axis.tickDecimals);
}
The axis object has "min" and "max" with the range of the axis,
"tickDecimals" with the number of decimals to round the value to and
@ -349,14 +349,14 @@ The axis object has "min" and "max" with the range of the axis,
by the automatic axis scaling algorithm (or specified by you). Here's
an example of a custom formatter:
function suffixFormatter(val, axis) {
if (val > 1000000)
return (val / 1000000).toFixed(axis.tickDecimals) + " MB";
else if (val > 1000)
return (val / 1000).toFixed(axis.tickDecimals) + " kB";
else
return val.toFixed(axis.tickDecimals) + " B";
}
function suffixFormatter(val, axis) {
if (val > 1000000)
return (val / 1000000).toFixed(axis.tickDecimals) + " MB";
else if (val > 1000)
return (val / 1000).toFixed(axis.tickDecimals) + " kB";
else
return val.toFixed(axis.tickDecimals) + " B";
}
"labelWidth" and "labelHeight" specifies a fixed size of the tick
labels in pixels. They're useful in case you need to align several
@ -390,16 +390,16 @@ that a series should be plotted against the second y axis.
To actually configure that axis, you can't use the xaxis/yaxis options
directly - instead there are two arrays in the options:
xaxes: []
yaxes: []
xaxes: []
yaxes: []
Here's an example of configuring a single x axis and two y axes (we
can leave options of the first y axis empty as the defaults are fine):
{
xaxes: [ { position: "top" } ],
yaxes: [ { }, { position: "right", min: 20 } ]
}
{
xaxes: [ { position: "top" } ],
yaxes: [ { }, { position: "right", min: 20 } ]
}
The arrays get their default values from the xaxis/yaxis settings, so
say you want to have all y axes start at zero, you can simply specify
@ -428,7 +428,7 @@ in milliseconds, so remember to multiply by 1000!
You can see a timestamp like this
alert((new Date()).getTime())
alert((new Date()).getTime())
Normally you want the timestamps to be displayed according to a
certain time zone, usually the time zone in which the data has been
@ -451,12 +451,12 @@ In PHP you can get an appropriate timestamp with
'calendar.timegm(datetime_object.timetuple()) * 1000', in .NET with
something like:
public static int GetJavascriptTimestamp(System.DateTime input)
{
System.TimeSpan span = new System.TimeSpan(System.DateTime.Parse("1/1/1970").Ticks);
System.DateTime time = input.Subtract(span);
return (long)(time.Ticks / 10000);
}
public static int GetJavascriptTimestamp(System.DateTime input)
{
System.TimeSpan span = new System.TimeSpan(System.DateTime.Parse("1/1/1970").Ticks);
System.DateTime time = input.Subtract(span);
return (long)(time.Ticks / 10000);
}
Javascript also has some support for parsing date strings, so it is
possible to generate the timestamps manually client-side.
@ -478,32 +478,32 @@ Date objects.
Tick generation and formatting can also be controlled separately
through the following axis options:
minTickSize: array
timeformat: null or format string
monthNames: null or array of size 12 of strings
twelveHourClock: boolean
minTickSize: array
timeformat: null or format string
monthNames: null or array of size 12 of strings
twelveHourClock: boolean
Here "timeformat" is a format string to use. You might use it like
this:
xaxis: {
mode: "time"
timeformat: "%y/%m/%d"
}
xaxis: {
mode: "time"
timeformat: "%y/%m/%d"
}
This will result in tick labels like "2000/12/24". The following
specifiers are supported
%h: hours
%H: hours (left-padded with a zero)
%M: minutes (left-padded with a zero)
%S: seconds (left-padded with a zero)
%d: day of month (1-31), use %0d for zero-padding
%m: month (1-12), use %0m for zero-padding
%y: year (four digits)
%b: month name (customizable)
%p: am/pm, additionally switches %h/%H to 12 hour instead of 24
%P: AM/PM (uppercase version of %p)
%h: hours
%H: hours (left-padded with a zero)
%M: minutes (left-padded with a zero)
%S: seconds (left-padded with a zero)
%d: day of month (1-31), use %0d for zero-padding
%m: month (1-12), use %0m for zero-padding
%y: year (four digits)
%b: month name (customizable)
%p: am/pm, additionally switches %h/%H to 12 hour instead of 24
%P: AM/PM (uppercase version of %p)
Inserting a zero like %0m or %0d means that the specifier will be
left-padded with a zero if it's only single-digit. So %y-%0m-%0d
@ -512,7 +512,7 @@ results in unambigious ISO timestamps like 2007-05-10 (for May 10th).
You can customize the month names with the "monthNames" option. For
instance, for Danish you might specify:
monthNames: ["jan", "feb", "mar", "apr", "maj", "jun", "jul", "aug", "sep", "okt", "nov", "dec"]
monthNames: ["jan", "feb", "mar", "apr", "maj", "jun", "jul", "aug", "sep", "okt", "nov", "dec"]
If you set "twelveHourClock" to true, the autogenerated timestamps
will use 12 hour AM/PM timestamps instead of 24 hour.
@ -528,17 +528,17 @@ If everything else fails, you can control the formatting by specifying
a custom tick formatter function as usual. Here's a simple example
which will format December 24 as 24/12:
tickFormatter: function (val, axis) {
var d = new Date(val);
return d.getUTCDate() + "/" + (d.getUTCMonth() + 1);
}
tickFormatter: function (val, axis) {
var d = new Date(val);
return d.getUTCDate() + "/" + (d.getUTCMonth() + 1);
}
Note that for the time mode "tickSize" and "minTickSize" are a bit
special in that they are arrays on the form "[value, unit]" where unit
is one of "second", "minute", "hour", "day", "month" and "year". So
you can specify
minTickSize: [1, "month"]
minTickSize: [1, "month"]
to get a tick interval size of at least 1 month and correspondingly,
if axis.tickSize is [2, "day"] in the tick formatter, the ticks have
@ -549,33 +549,33 @@ been produced with two days in-between.
Customizing the data series
===========================
series: {
lines, points, bars: {
show: boolean
lineWidth: number
fill: boolean or number
fillColor: null or color/gradient
}
points: {
radius: number
symbol: "circle" or function
}
bars: {
barWidth: number
align: "left" or "center"
horizontal: boolean
}
lines: {
steps: boolean
series: {
lines, points, bars: {
show: boolean
lineWidth: number
fill: boolean or number
fillColor: null or color/gradient
}
points: {
radius: number
symbol: "circle" or function
}
bars: {
barWidth: number
align: "left" or "center"
horizontal: boolean
}
lines: {
steps: boolean
}
shadowSize: number
}
shadowSize: number
}
colors: [ color1, color2, ... ]
colors: [ color1, color2, ... ]
The options inside "series: {}" are copied to each of the series. So
you can specify that all series should have bars by putting it in the
@ -590,12 +590,12 @@ lines: { show: false }). You can specify the various types
independently of each other, and Flot will happily draw each of them
in turn (this is probably only useful for lines and points), e.g.
var options = {
series: {
lines: { show: true, fill: true, fillColor: "rgba(255, 255, 255, 0.8)" },
points: { show: true, fill: false }
}
};
var options = {
series: {
lines: { show: true, fill: true, fillColor: "rgba(255, 255, 255, 0.8)" },
points: { show: true, fill: false }
}
};
"lineWidth" is the thickness of the line or outline in pixels. You can
set it to 0 to prevent a line or outline from being drawn; this will
@ -630,13 +630,13 @@ For points, you can specify the radius and the symbol. The only
built-in symbol type is circles, for other types you can use a plugin
or define them yourself by specifying a callback:
function cross(ctx, x, y, radius, shadow) {
function cross(ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(Math.PI) / 2;
ctx.moveTo(x - size, y - size);
ctx.lineTo(x + size, y + size);
ctx.moveTo(x - size, y + size);
ctx.lineTo(x + size, y - size);
}
}
The parameters are the drawing context, x and y coordinates of the
center of the point, a radius which corresponds to what the circle
@ -653,7 +653,7 @@ The "colors" array specifies a default color theme to get colors for
the data series from. You can specify as many colors as you like, like
this:
colors: ["#d18b2c", "#dba255", "#919733"]
colors: ["#d18b2c", "#dba255", "#919733"]
If there are more data series than colors, Flot will try to generate
extra colors by lightening and darkening colors in the theme.
@ -662,26 +662,26 @@ extra colors by lightening and darkening colors in the theme.
Customizing the grid
====================
grid: {
show: boolean
aboveData: boolean
color: color
backgroundColor: color/gradient or null
labelMargin: number
axisMargin: number
markings: array of markings or (fn: axes -> array of markings)
borderWidth: number
borderColor: color or null
minBorderMargin: number or null
clickable: boolean
hoverable: boolean
autoHighlight: boolean
mouseActiveRadius: number
}
interaction: {
redrawOverlayInterval: number or -1
}
grid: {
show: boolean
aboveData: boolean
color: color
backgroundColor: color/gradient or null
labelMargin: number
axisMargin: number
markings: array of markings or (fn: axes -> array of markings)
borderWidth: number
borderColor: color or null
minBorderMargin: number or null
clickable: boolean
hoverable: boolean
autoHighlight: boolean
mouseActiveRadius: number
}
interaction: {
redrawOverlayInterval: number or -1
}
The grid is the thing with the axes and a number of ticks. Many of the
things in the grid are configured under the individual axes, but not
@ -716,7 +716,7 @@ the axes for the plot in an object as the first parameter.
You can set the color of markings by specifying "color" in the ranges
object. Here's an example array:
markings: [ { xaxis: { from: 0, to: 2 }, yaxis: { from: 10, to: 10 }, color: "#bb0000" }, ... ]
markings: [ { xaxis: { from: 0, to: 2 }, yaxis: { from: 10, to: 10 }, color: "#bb0000" }, ... ]
If you leave out one of the values, that value is assumed to go to the
border of the plot. So for example if you only specify { xaxis: {
@ -725,19 +725,19 @@ bottom of the plot in the x range 0-2.
A line is drawn if from and to are the same, e.g.
markings: [ { yaxis: { from: 1, to: 1 } }, ... ]
markings: [ { yaxis: { from: 1, to: 1 } }, ... ]
would draw a line parallel to the x axis at y = 1. You can control the
line width with "lineWidth" in the range object.
An example function that makes vertical stripes might look like this:
markings: function (axes) {
var markings = [];
for (var x = Math.floor(axes.xaxis.min); x < axes.xaxis.max; x += 2)
markings.push({ xaxis: { from: x, to: x + 1 } });
return markings;
}
markings: function (axes) {
var markings = [];
for (var x = Math.floor(axes.xaxis.min); x < axes.xaxis.max; x += 2)
markings.push({ xaxis: { from: x, to: x + 1 } });
return markings;
}
If you set "clickable" to true, the plot will listen for click events
@ -758,25 +758,25 @@ You can use "plotclick" and "plothover" events like this:
$.plot($("#placeholder"), [ d ], { grid: { clickable: true } });
$("#placeholder").bind("plotclick", function (event, pos, item) {
alert("You clicked at " + pos.x + ", " + pos.y);
// axis coordinates for other axes, if present, are in pos.x2, pos.x3, ...
// if you need global screen coordinates, they are pos.pageX, pos.pageY
if (item) {
highlight(item.series, item.datapoint);
alert("You clicked a point!");
}
alert("You clicked at " + pos.x + ", " + pos.y);
// axis coordinates for other axes, if present, are in pos.x2, pos.x3, ...
// if you need global screen coordinates, they are pos.pageX, pos.pageY
if (item) {
highlight(item.series, item.datapoint);
alert("You clicked a point!");
}
});
The item object in this example is either null or a nearby object on the form:
item: {
item: {
datapoint: the point, e.g. [0, 2]
dataIndex: the index of the point in the data array
series: the series object
seriesIndex: the index of the series
pageX, pageY: the global screen coordinates of the point
}
}
For instance, if you have specified the data like this
@ -813,14 +813,14 @@ Specifying gradients
A gradient is specified like this:
{ colors: [ color1, color2, ... ] }
{ colors: [ color1, color2, ... ] }
For instance, you might specify a background on the grid going from
black to gray like this:
grid: {
backgroundColor: { colors: ["#000", "#999"] }
}
grid: {
backgroundColor: { colors: ["#000", "#999"] }
}
For the series you can specify the gradient as an object that
specifies the scaling of the brightness and the opacity of the series
@ -832,12 +832,12 @@ where the first color simply has its alpha scaled, whereas the second
is also darkened. For instance, for bars the following makes the bars
gradually disappear, without outline:
bars: {
bars: {
show: true,
lineWidth: 0,
fill: true,
fillColor: { colors: [ { opacity: 0.8 }, { opacity: 0.1 } ] }
}
}
Flot currently only supports vertical gradients drawn from top to
bottom because that's what works with IE.
@ -922,8 +922,8 @@ can call:
space within the placeholder div. If you are working with multiple axes, you
can specify the x and y axis references, e.g.
o = pointOffset({ x: xpos, y: ypos, xaxis: 2, yaxis: 3 })
// o.left and o.top now contains the offset within the div
o = pointOffset({ x: xpos, y: ypos, xaxis: 2, yaxis: 3 })
// o.left and o.top now contains the offset within the div
- resize()
@ -1040,14 +1040,14 @@ You can add them through the "hooks" option, and they are also available
after the plot is constructed as the "hooks" attribute on the returned
plot object, e.g.
// define a simple draw hook
function hellohook(plot, canvascontext) { alert("hello!"); };
// define a simple draw hook
function hellohook(plot, canvascontext) { alert("hello!"); };
// pass it in, in an array since we might want to specify several
var plot = $.plot(placeholder, data, { hooks: { draw: [hellohook] } });
// pass it in, in an array since we might want to specify several
var plot = $.plot(placeholder, data, { hooks: { draw: [hellohook] } });
// we can now find it again in plot.hooks.draw[0] unless a plugin
// has added other hooks
// we can now find it again in plot.hooks.draw[0] unless a plugin
// has added other hooks
The available hooks are described below. All hook callbacks get the
plot object as first parameter. You can find some examples of defined
@ -1078,10 +1078,10 @@ hooks in the plugins bundled with Flot.
The default format array for points is something along the lines of:
[
{ x: true, number: true, required: true },
{ y: true, number: true, required: true }
]
[
{ x: true, number: true, required: true },
{ y: true, number: true, required: true }
]
The first object means that for the first coordinate it should be
taken into account when scaling the x axis, that it must be a
@ -1104,11 +1104,11 @@ hooks in the plugins bundled with Flot.
given in datapoints.pointsize. Here's a simple transform that
multiplies all y coordinates by 2:
function multiply(plot, series, datapoints) {
function multiply(plot, series, datapoints) {
var points = datapoints.points, ps = datapoints.pointsize;
for (var i = 0; i < points.length; i += ps)
points[i + 1] *= 2;
}
points[i + 1] *= 2;
}
Note that you must leave datapoints in a good condition as Flot
doesn't check it or do any normalization on it afterwards.
@ -1141,11 +1141,11 @@ hooks in the plugins bundled with Flot.
necessary event handlers on eventHolder, a jQuery object with the
canvas, e.g.
function (plot, eventHolder) {
function (plot, eventHolder) {
eventHolder.mousedown(function (e) {
alert("You pressed the mouse at " + e.pageX + " " + e.pageY);
alert("You pressed the mouse at " + e.pageX + " " + e.pageY);
});
}
}
Interesting events include click, mousemove, mouseup/down. You can
use all jQuery events. Usually, the event handlers will update the
@ -1168,7 +1168,7 @@ hooks in the plugins bundled with Flot.
- drawOverlay [phase 7]
function (plot, canvascontext)
function(plot, canvascontext)
The drawOverlay hook is used for interactive things that need a
canvas to draw on. The model currently used by Flot works the way
@ -1185,7 +1185,7 @@ hooks in the plugins bundled with Flot.
- shutdown [phase 8]
function (plot, eventHolder)
function(plot, eventHolder)
Run when plot.shutdown() is called, which usually only happens in
case a plot is overwritten by a new plot. If you're writing a

2
README.txt.md
Unescape Escape View File

@ -67,7 +67,7 @@ ready, run the plot function:
Here, data is an array of data series and options is an object with
settings if you want to customize the plot. Take a look at the
examples for some ideas of what to put in or look at the reference
in the file "API.txt". Here's a quick example that'll draw a line from
in the file "API.txt.md". Here's a quick example that'll draw a line from
(0, 0) to (1, 1):
$.plot($("#placeholder"), [ [[0, 0], [1, 1]] ], { yaxis: { max: 1 } });

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