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Commit 54cde197 authored by David Schnur's avatar David Schnur
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Merge pull request #62 from ablfx/master 

Correct GitHub Syntax Highlighting in API markdown file
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API.md
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......@@ -2,9 +2,9 @@ Flot Reference
--------------
Consider a call to the plot function:
var plot = $.plot(placeholder, data, options)
```js
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
width and height set as explained in the README (go read that now if
......@@ -27,18 +27,18 @@ Data Format
-----------
The data is an array of data series:
[ series1, series2, ... ]
```js
[ series1, series2, ... ]
```
A series can either be raw data or an object with properties. The raw
data format is an array of points:
```js
[ [x1, y1], [x2, y2], ... ]
```
E.g.
```js
[ [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
how to do this). This is a common problem because you might retrieve
......@@ -57,7 +57,7 @@ can specify a third coordinate which is the bottom of the filled
area/bar (defaults to 0).
The format of a single series object is as follows:
```js
{
color: color or number
data: rawdata
......@@ -71,16 +71,15 @@ The format of a single series object is as follows:
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:
```js
{
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.
......@@ -107,17 +106,17 @@ commmand. When you specify them for a specific data series, they will
override the default options for the plot for that data series.
Here's a complete example of a simple data specification:
```js
[ { label: "Foo", data: [ [10, 1], [17, -14], [30, 5] ] },
{ label: "Bar", data: [ [11, 13], [19, 11], [30, -7] ] } ]
```
Plot Options
------------
All options are completely optional. They are documented individually
below, to change them you just specify them in an object, e.g.
```js
var options = {
series: {
lines: { show: true },
......@@ -126,11 +125,10 @@ below, to change them you just specify them in an object, e.g.
};
$.plot(placeholder, data, options);
```
Customizing the legend
======================
```js
legend: {
show: boolean
labelFormatter: null or (fn: string, series object -> string)
......@@ -141,20 +139,19 @@ Customizing the legend
backgroundColor: null or color
backgroundOpacity: number between 0 and 1
container: null or jQuery object/DOM element/jQuery expression
sorted: null/false, true, "ascending", "descending" or a comparator
}
```
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
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:
```js
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
plot (top-right, top-left, etc.) and margin the distance to the plot
......@@ -168,25 +165,10 @@ specify "container" as a jQuery object/expression to put the legend
table into. The "position" and "margin" etc. options will then be
ignored. Note that Flot will overwrite the contents of the container.
Legend entries appear in the same order as their series by default. To
sort them alphabetically, you can specify "sorted" as tue, "ascending"
or "descending", where true and "ascending" are equivalent.
You can also provide your own comparator function that accepts two
objects with "label" and "color" properties, and returns zero if they
are equal, a positive value if the first is greater than the second,
and a negative value if the first is less than the second.
sorted: function(a, b) {
// sort alphabetically in ascending order
return a.label == b.label ? 0 : (
a.label > b.label ? 1 : -1
)
}
Customizing the axes
====================
```js
xaxis, yaxis: {
show: null or true/false
position: "bottom" or "top" or "left" or "right"
......@@ -218,7 +200,7 @@ Customizing the axes
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
one x axis or y axis.
......@@ -246,7 +228,7 @@ directly with "font". The default value of null means that the font is
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:
```js
{
size: 11,
style: "italic",
......@@ -254,7 +236,7 @@ format is like this:
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
be chosen based on the minimum/maximum data values. Note that Flot
......@@ -277,20 +259,20 @@ suppress weekends or compress far away points with a logarithm or some
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:
```js
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:
```js
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).
......@@ -323,13 +305,13 @@ see the next section.
If you want to completely override the tick algorithm, you can specify
an array for "ticks", either like this:
```js
ticks: [0, 1.2, 2.4]
```
Or like this where the labels are also customized:
```js
ticks: [[0, "zero"], [1.2, "one mark"], [2.4, "two marks"]]
```
You can mix the two if you like.
For extra flexibility you can specify a function as the "ticks"
......@@ -337,7 +319,7 @@ parameter. The function will be called with an object with the axis
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:
```js
function piTickGenerator(axis) {
var res = [], i = Math.floor(axis.min / Math.PI);
do {
......@@ -348,7 +330,7 @@ axis for trigonometric functions:
return res;
}
```
You can control how the ticks look like with "tickDecimals", the
number of decimals to display (default is auto-detected).
......@@ -356,17 +338,17 @@ Alternatively, for ultimate control over how ticks are formatted you can
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:
```js
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
"tickSize" with the size of the interval between ticks as calculated
by the automatic axis scaling algorithm (or specified by you). Here's
an example of a custom formatter:
```js
function suffixFormatter(val, axis) {
if (val > 1000000)
return (val / 1000000).toFixed(axis.tickDecimals) + " MB";
......@@ -375,7 +357,7 @@ an example of a custom formatter:
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
plots. "reserveSpace" means that even if an axis isn't shown, Flot
......@@ -407,18 +389,18 @@ 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:
```js
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):
```js
{
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
yaxis: { min: 0 } instead of adding a min parameter to all the axes.
......@@ -448,10 +430,10 @@ Javascript timestamp is the number of milliseconds since January 1,
in milliseconds, so remember to multiply by 1000!
You can see a timestamp like this
```js
alert((new Date()).getTime())
There are different schools of thought when it comes to display of
```
There are different schools of thought when it comes to diplay of
timestamps. Many will want the timestamps to be displayed according to
a certain time zone, usually the time zone in which the data has been
produced. Some want the localized experience, where the timestamps are
......@@ -474,14 +456,14 @@ In PHP you can get an appropriate timestamp with
'strtotime("2002-02-20 UTC") * 1000', in Python with
'calendar.timegm(datetime_object.timetuple()) * 1000', in .NET with
something like:
```js
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.
......@@ -513,24 +495,24 @@ Date objects.
Tick generation and formatting can also be controlled separately
through the following axis options:
```js
minTickSize: array
timeformat: null or format string
monthNames: null or array of size 12 of strings
dayNames: null or array of size 7 of strings
twelveHourClock: boolean
```
Here "timeformat" is a format string to use. You might use it like
this:
```js
xaxis: {
mode: "time"
timeformat: "%Y/%m/%d"
}
```
This will result in tick labels like "2000/12/24". A subset of the
standard strftime specifiers are supported:
```js
%a: weekday name (customizable)
%b: month name (customizable)
%d: day of month, zero-padded (01-31)
......@@ -545,17 +527,17 @@ standard strftime specifiers are supported:
%p: am/pm
%P: AM/PM (uppercase version of %p)
%w: weekday as number (0-6, 0 being Sunday)
```
You can customize the month names with the "monthNames" option. For
instance, for Danish you might specify:
```js
monthNames: ["jan", "feb", "mar", "apr", "maj", "jun", "jul", "aug", "sep", "okt", "nov", "dec"]
```
Similarly you can customize the weekday names with the "dayNames"
option. An example in French:
```js
dayNames: ["dim", "lun", "mar", "mer", "jeu", "ven", "sam"]
```
If you set "twelveHourClock" to true, the autogenerated timestamps
will use 12 hour AM/PM timestamps instead of 24 hour. This only
applies if you have not set "timeformat". Use the "%I" and "%p" or
......@@ -570,19 +552,19 @@ more powerful date/time formatting.
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:
```js
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
```js
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
been produced with two days in-between.
......@@ -591,7 +573,7 @@ been produced with two days in-between.
Customizing the data series
===========================
```js
series: {
lines, points, bars: {
show: boolean
......@@ -619,7 +601,7 @@ Customizing the data series
}
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
global options, or override it for individual series by specifying
......@@ -632,14 +614,14 @@ default to showing lines (you can turn this off with
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.
```js
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
also hide the shadow.
......@@ -672,7 +654,7 @@ data by adding extra points.
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:
```js
function cross(ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(Math.PI) / 2;
ctx.moveTo(x - size, y - size);
......@@ -680,7 +662,7 @@ or define them yourself by specifying a callback:
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
would have used and whether the call is to draw a shadow (due to
......@@ -695,16 +677,16 @@ remove shadows.
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:
```js
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.
Customizing the grid
====================
```js
grid: {
show: boolean
aboveData: boolean
......@@ -726,7 +708,7 @@ Customizing the grid
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
all. "color" is the color of the grid itself whereas "backgroundColor"
......@@ -741,14 +723,14 @@ above the data or below (below is default).
"margin" is the space in pixels between the canvas edge and the grid,
which can be either a number or an object with individual margins for
each side, in the form:
```js
margin: {
top: top margin in pixels
left: left margin in pixels
bottom: bottom margin in pixels
right: right margin in pixels
}
```
"labelMargin" is the space in pixels between tick labels and axis
line, and "axisMargin" is the space in pixels between axes when there
are two next to each other.
......@@ -770,30 +752,30 @@ 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:
```js
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: {
from: 0, to: 2 } } it means an area that extends from the top to the
bottom of the plot in the x range 0-2.
A line is drawn if from and to are the same, e.g.
```js
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:
```js
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
on the plot area and fire a "plotclick" event on the placeholder with
......@@ -809,7 +791,7 @@ If needed, you can disable highlighting and control it yourself with
the highlight/unhighlight plot methods described elsewhere.
You can use "plotclick" and "plothover" events like this:
```js
$.plot($("#placeholder"), [ d ], { grid: { clickable: true } });
$("#placeholder").bind("plotclick", function (event, pos, item) {
......@@ -822,9 +804,9 @@ You can use "plotclick" and "plothover" events like this:
alert("You clicked a point!");
}
});
```
The item object in this example is either null or a nearby object on the form:
```js
item: {
datapoint: the point, e.g. [0, 2]
dataIndex: the index of the point in the data array
......@@ -832,11 +814,11 @@ The item object in this example is either null or a nearby object on the form:
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
```js
$.plot($("#placeholder"), [ { label: "Foo", data: [[0, 10], [7, 3]] } ], ...);
```
and the mouse is near the point (7, 3), "datapoint" is [7, 3],
"dataIndex" will be 1, "series" is a normalized series object with
among other things the "Foo" label in series.label and the color in
......@@ -867,33 +849,33 @@ Specifying gradients
====================
A gradient is specified like this:
```js
{ colors: [ color1, color2, ... ] }
```
For instance, you might specify a background on the grid going from
black to gray like this:
```js
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
color, e.g.
```js
{ colors: [{ opacity: 0.8 }, { brightness: 0.6, opacity: 0.8 } ] }
```
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:
```js
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.
......@@ -1004,11 +986,11 @@ Flot to keep track of its state, so be careful.
form with missing settings filled in according to the global
options. So for instance to find out what color Flot has assigned
to the data series, you could do this:
```js
var series = plot.getData();
for (var i = 0; i < series.length; ++i)
alert(series[i].color);
```
A notable other interesting field besides color is datapoints
which has a field "points" with the normalized data points in a
flat array (the field "pointsize" is the increment in the flat
......@@ -1132,12 +1114,12 @@ hooks in the plugins bundled with Flot.
how it interferes with axis scaling.
The default format array for points is something along the lines of:
```js
[
{ 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
number, and that it is required - so if it is null or cannot be
......@@ -1149,22 +1131,22 @@ hooks in the plugins bundled with Flot.
- processDatapoints [phase 3]
```js
function(plot, series, datapoints)
```
Called after normalization of the given series but before finding
min/max of the data points. This hook is useful for implementing data
transformations. "datapoints" contains the normalized data points in
a flat array as datapoints.points with the size of a single point
given in datapoints.pointsize. Here's a simple transform that
multiplies all y coordinates by 2:
```js
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;
}
```
Note that you must leave datapoints in a good condition as Flot
doesn't check it or do any normalization on it afterwards.
......@@ -1214,13 +1196,13 @@ hooks in the plugins bundled with Flot.
Called after Flot has setup its event handlers. Should set any
necessary event handlers on eventHolder, a jQuery object with the
canvas, e.g.
```js
function (plot, eventHolder) {
eventHolder.mousedown(function (e) {
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
state by drawing something (add a drawOverlay hook and call
......@@ -1242,7 +1224,7 @@ 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
......@@ -1259,7 +1241,7 @@ 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
......
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