### Install Development Tools

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

Run this command to install PHPCS and register the necessary coding standards for the project.

```bash
composer install
```

--------------------------------

### Example Series Configuration

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Demonstrates how to enable and configure lines and points for data series. This example shows filled lines with a specific color and unfilled points.

```javascript
var options = {
    series: {
        lines: { show: true, fill: true, fillColor: "rgba(255, 255, 255, 0.8)" },
        points: { show: true, fill: false }
    }
};
```

--------------------------------

### Example Series Object with Label and Data

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

A minimal example of a series object, specifying a label for the legend and the data points.

```javascript
{
    label: "y = 3",
    data: [[0, 3], [10, 3]]
}
```

--------------------------------

### Simple Line Plot Example

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/README.md

A minimal example demonstrating how to draw a simple line graph from (0,0) to (1,1) with a maximum y-axis value of 1.

```javascript
$.plot($("#placeholder"), [ [[0, 0], [1, 1]] ], { yaxis: { max: 1 } });
```

--------------------------------

### Example Raw Data Points

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

An example of raw data points for a Flot series. Ensure all coordinate values are numeric.

```javascript
[ [1, 3], [2, 14.01], [3.5, 3.14] ]
```

--------------------------------

### Markings Array Example

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

An example of how to define markings for the grid using an array of objects. Each object specifies a range and color for a marking, such as a horizontal line.

```javascript
markings: [ { xaxis: { from: 0, to: 2 }, yaxis: { from: 10, to: 10 }, color: "#bb0000" }, ... ]
```

--------------------------------

### Validate PHP_CodeSniffer Installation

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

This command lists the installed coding standards, including WordPress standards, confirming that PHPCS is correctly set up and can find them.

```bash
vendor\bin\phpcs -i
```

--------------------------------

### Example Data Specification with Multiple Series

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Demonstrates how to define multiple data series, each with a label and its own set of data points.

```javascript
[ { label: "Foo", data: [ [10, 1], [17, -14], [30, 5] ] },
  { label: "Bar", data: [ [11, 13], [19, 11], [30, -7] ] }
]
```

--------------------------------

### Ruby Time Conversion Example for Flot

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/NEWS.md

This snippet provides an example of time conversion using Ruby, relevant for Flot's time-mode plugin.

```ruby
require 'time'

# Convert a Unix timestamp to a human-readable date and time
puts Time.at(1337100000).strftime('%Y-%m-%d %H:%M:%S')

# Convert a date string to a Unix timestamp
puts Time.parse('2012-05-15 10:00:00').to_i
```

--------------------------------

### Complete Debug Plugin Example

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/PLUGINS.md

A comprehensive example of a Flot plugin that provides debugging information. It uses options to control the debug level and hooks into 'processOptions' and 'processDatapoints'. The plugin is wrapped in an anonymous function for scope protection.

```javascript
(function ($) {
    function init(plot) {
        var debugLevel = 1;

        function checkDebugEnabled(plot, options) {
            if (options.debug) {
                debugLevel = options.debug;
                plot.hooks.processDatapoints.push(alertSeries);
            }
        }

        function alertSeries(plot, series, datapoints) {
            var msg = "series " + series.label;
            if (debugLevel > 1) {
                msg += " with " + series.data.length + " points";
                alert(msg);
            }
        }

        plot.hooks.processOptions.push(checkDebugEnabled);
    }

    var options = { debug: 0 };
      
    $.plot.plugins.push({
        init: init,
        options: options,
        name: "simpledebug",
        version: "0.1"
    });
})(jQuery);
```

--------------------------------

### Series-Specific Options Example

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/PLUGINS.md

An example of how to define options that are specific to each series within a Flot plot. These options are placed under the 'series' key in the main options object and can provide default values.

```javascript
var options = {
    series: {
        downsample: {
            algorithm: null,
            maxpoints: 1000
        }
    }
}
```

--------------------------------

### Example of Markings Configuration in Flot

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/NEWS.md

Markings are now specified as ranges on the axes. This example shows how to define markings for the x-axis. Horizontal or vertical lines can be drawn by setting 'from' and 'to' to the same coordinate.

```javascript
{
  xaxis: { from: 0, to: 10 }
}
```

--------------------------------

### Verify WPCS Configuration

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

Check if the WordPress Coding Standards (WPCS) are correctly configured and installed. This ensures the development environment is set up properly.

```bash
composer run wpcs:doctor
```

--------------------------------

### Default Color Theme Example

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Illustrates how to define a default color theme for data series using an array of color strings. Flot will generate additional colors if more series exist than colors provided.

```javascript
colors: ["#d18b2c", "#dba255", "#919733"]
```

--------------------------------

### JavaScript Logarithmic Axis Transformation

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Example of how to implement a logarithmic scale for an axis by providing transform and inverseTransform functions. Ensure the transform function is monotone.

```javascript
xaxis: {
    transform: function (v) { return Math.log(v); },
    inverseTransform: function (v) { return Math.exp(v); }
}
```

--------------------------------

### Single Site Cron Processing

Source: https://github.com/groundhoggwp/groundhogg/blob/master/gh-cron.txt

Executes the Groundhogg event queue directly for single-site installations. This is the default behavior when not in a multisite configuration.

```php
\Groundhogg\event_queue()->run_queue();
```

--------------------------------

### Specify Gradient Colors and Opacity for Series

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Control the appearance of series gradients by specifying opacity and brightness for individual colors. This example shows a series where colors fade out.

```javascript
{ colors: [{ opacity: 0.8 }, { brightness: 0.6, opacity: 0.8 } ] }
```

--------------------------------

### Direct Cron Execution Header Setup

Source: https://github.com/groundhoggwp/groundhogg/blob/master/gh-cron.txt

Configures HTTP headers to prevent caching and ensure the request doesn't block, optimizing direct cron job execution.

```php
ignore_user_abort( true );

/* Don't make the request block till we finish, if possible. */
if ( ! headers_sent() ) {
	header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
	header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
}
```

--------------------------------

### Basic Flot Plot Initialization

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Example of initializing a Flot plot with a simple series. The 'datapoint', 'dataIndex', and 'series' properties in event handlers will correspond to this data structure.

```javascript
$.plot($("#placeholder"), [ { label: "Foo", data: [[0, 10], [7, 3]] } ], ...);
```

--------------------------------

### Basic Plugin Structure

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/PLUGINS.md

A minimal example of a Flot plugin. It defines an initialization function and adds it to the $.plot.plugins array. The plugin adds a 'coolstring' attribute to the plot object.

```javascript
function myCoolPluginInit(plot) {
    plot.coolstring = "Hello!";
};

$.plot.plugins.push({ init: myCoolPluginInit, options: { ... } });

// if $.plot is called, it will return a plot object with the
// attribute "coolstring"
```

--------------------------------

### Multisite Cron Processing

Source: https://github.com/groundhoggwp/groundhogg/blob/master/gh-cron.txt

Handles cron processing for multisite installations by creating and executing multiple requests to each subsite's cron endpoint. This improves performance and efficiency.

```php
if ( ! empty( $_POST ) || defined( 'DOING_AJAX' ) || defined( 'DOING_CRON' ) || defined( 'DOING_GH_CRON' ) ) {
	die();
}

/**
 * Tell WordPress we are doing the CRON task.
 *
 * Keep for compatibility
 *
 * @var bool
 */
define( 'DOING_CRON', true );

/**
 * Special const for Groundhogg compat
 *
 * @var bool
 */
define( 'DOING_GH_CRON', true );

define( 'QM_DISABLED', true );

/**
 * How many concurrent requests you can make, too many might DDOS your server so be careful
 */
define( 'GH_MS_CRON_CONCURRENCY', 5 );

// This makes it so that it is not required to set up individual cron jobs for each subsite.
if ( is_multisite() && is_main_site() && ! \Groundhogg\get_url_var( 'process_queue' ) ) {

	$requests = [];

	/**
	 * Build a multi request object (faster and better performance + callbacks) for each sub site
	 *
	 * @var $blog WP_Site
	 */
	foreach ( get_sites() as $blog ) {

		$request = [
			'type' => 'GET',
			'url'  => $blog->siteurl . '/gh-cron.php?process_queue=1',
		];

		$requests[] = $request;
	}

	while ( ! empty( $requests ) ) {
		Requests::request_multiple( array_splice( $requests, 0, GH_MS_CRON_CONCURRENCY ) );
	}

} // Single site do the cron
else {
	\Groundhogg\event_queue()->run_queue();
}

die();
```

--------------------------------

### Specify Gradient Colors for Grid Background

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Define a gradient for the grid background by providing an array of colors to the 'colors' property within 'grid.backgroundColor'. This example creates a gradient from black to gray.

```javascript
grid: {
    backgroundColor: { colors: ["#000", "#999"] }
}
```

--------------------------------

### Custom Suffix Formatter for Ticks

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

An example of a custom tick formatter function that appends units like 'B', 'kB', or 'MB' based on the tick value. This provides more human-readable labels for large numbers.

```javascript
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";
}
```

--------------------------------

### Multiply Y Coordinates Data Transformation in Flot

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

A simple data transformation example for the processDatapoints hook that multiplies all y coordinates by 2. Ensure datapoints remain in a valid condition after modification.

```javascript
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;
}
```

--------------------------------

### Initialize WordPress Environment

Source: https://github.com/groundhoggwp/groundhogg/blob/master/gh-cron.txt

Ensures the WordPress environment is set up before proceeding. This is crucial for accessing WordPress functions and constants.

```php
if ( ! defined( 'ABSPATH' ) ) {
	/** Set up WordPress environment */
	require_once( __DIR__ . '/wp-load.php' );
}
```

--------------------------------

### Using the Debug Plugin

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/PLUGINS.md

Demonstrates how to include and enable the 'simpledebug' plugin when initializing a Flot chart. The 'debug' option is set to 2 to activate the plugin and control the output level.

```javascript
$.plot($("#placeholder"), [...], { debug: 2 });
```

--------------------------------

### Get JavaScript Timestamp

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Use `(new Date()).getTime()` to get the current time as a JavaScript timestamp (milliseconds since epoch). This is crucial for time series data in Flot.

```javascript
alert((new Date()).getTime())
```

--------------------------------

### Initialize a Flot Plot

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Use this to create a new plot. The placeholder must have width and height set. Consider using a dedicated div for the plot.

```javascript
var plot = $.plot(placeholder, data, options)
```

--------------------------------

### Configure PhpStorm for PHP_CodeSniffer

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

Instructions for setting up PhpStorm to automatically detect and use the project's PHP_CodeSniffer configuration for code inspections.

```php
vendor\bin\phpcs
```

--------------------------------

### Get Plot Dimensions

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Retrieve the width and height of the plotting area within the grid. This excludes space for labels and margins.

```javascript
width()
```

```javascript
height()
```

--------------------------------

### Get Javascript Timestamp in .NET

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

This C# function converts a DateTime object to a Javascript-compatible timestamp (milliseconds since epoch).

```csharp
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);
}
```

--------------------------------

### Plot Offset API

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Get the offset of the plot grid within the canvas. This is useful for positioning elements relative to the plot area.

```APIDOC
## GET /plot/offset

### Description
Gets the offset of the grid within the canvas. Returns an object with distances from the canvas edges.

### Method
GET

### Endpoint
/plot/offset

### Parameters
None

### Request Example
None

### Response
#### Success Response (200)
- **offset** (object) - An object containing 'left', 'right', 'top', and 'bottom' distances.

#### Response Example
```json
{
  "offset": {
    "left": 50,
    "right": 20,
    "top": 30,
    "bottom": 40
  }
}
```
```

--------------------------------

### Get Plot Offset

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Returns the offset of the plotting area relative to the document. Useful for calculating mouse positions within the plot.

```javascript
offset()
```

--------------------------------

### Custom Tick Formatter Function in Flot

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Implement a custom 'tickFormatter' function to control how tick values are displayed. This example formats dates as DD/MM.

```javascript
tickFormatter: function (val, axis) {
    var d = new Date(val);
    return d.getUTCDate() + "/" + (d.getUTCMonth() + 1);
}
```

--------------------------------

### Get Plot Axes

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Retrieves an object containing all axes. Provides access to axis properties like ticks, and transformation functions (p2c, c2p).

```javascript
getAxes()
```

--------------------------------

### Get Data Point Offset

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Calculates the offset of a data point within the placeholder div, based on its data coordinates. Can specify axes for multi-axis plots.

```javascript
pointOffset({ x: xpos, y: ypos })
```

```javascript
pointOffset({ x: xpos, y: ypos, xaxis: 2, yaxis: 3 })
```

--------------------------------

### Run WPCS Inspections on a Specific File

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

This command runs WPCS inspections on a specified PHP file and reports any violations found according to the WordPress standard.

```bash
vendor\bin\phpcs -sp --standard=WordPress admin\events\events-page.php
```

--------------------------------

### Robust Plugin Initialization

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/PLUGINS.md

This pattern wraps plugin code in an immediately invoked anonymous function to prevent global scope pollution. It also accepts the '$' as an argument to ensure compatibility with different jQuery bindings.

```javascript
(function ($) {
    // plugin definition
    // ...
})(jQuery);
```

--------------------------------

### Custom Tick Generator Function

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Define a function for the 'ticks' option to generate ticks dynamically based on axis properties. This example generates ticks at intervals of pi.

```javascript
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;
}
```

--------------------------------

### Configure PhpStorm File Watcher for Auto-fixing

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

Set up a PhpStorm File Watcher to automatically run phpcbf on file save, ensuring code is auto-fixed as you work.

```php
vendor\bin\phpcbf
```

--------------------------------

### Lint PHP Code

Source: https://github.com/groundhoggwp/groundhogg/blob/master/README.md

Execute this command to check your PHP code against the defined coding standards and identify any violations.

```bash
composer run lint:php
```

--------------------------------

### Get Plot Data Series

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Returns an array of the current data series in a normalized format. Useful for inspecting series properties like color and data points.

```javascript
var series = plot.getData();
for (var i = 0; i < series.length; ++i)
    alert(series[i].color);
```

--------------------------------

### Grid Configuration Options

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Defines the structure for grid configuration, including visibility, colors, margins, borders, and markings. Use this to control the visual appearance of the plot grid.

```javascript
grid: {
    show: boolean
    aboveData: boolean
    color: color
    backgroundColor: color/gradient or null
    margin: number or margin object
    labelMargin: number
    axisMargin: number
    markings: array of markings or (fn: axes -> array of markings)
    borderWidth: number or object with "top", "right", "bottom" and "left" properties with different widths
    borderColor: color or null or object with "top", "right", "bottom" and "left" properties with different colors
    minBorderMargin: number or null
    clickable: boolean
    hoverable: boolean
    autoHighlight: boolean
    mouseActiveRadius: number
}

interaction: {
    redrawOverlayInterval: number or -1
}
```

--------------------------------

### Plot Function Usage

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Demonstrates how to initialize a Flot plot using the $.plot() function, either directly or via jQuery chaining.

```APIDOC
## Plot Function Usage

### Description
Initializes a Flot plot on a given placeholder element with specified data and options.

### Method
`$.plot(placeholder, data, options)` or `$(placeholder).plot(data, options)`

### Endpoint
N/A (JavaScript function)

### Parameters
- **placeholder** (jQuery object or DOM element or jQuery expression) - The element where the plot will be rendered. It must have its width and height set.
- **data** (Array) - An array of data series to plot.
- **options** (Object) - An object containing various plot configuration options.

### Request Example
```javascript
// Direct usage
var plot = $.plot(placeholder, data, options);

// jQuery chaining
var plot = $("#placeholder").plot(data, options).data("plot");
```

### Response
- **plot object** (Object) - An object representing the plot instance, which has methods for interacting with the plot.
```

--------------------------------

### Correct Spacing in JavaScript Loops

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/CONTRIBUTING.md

Demonstrates the correct spacing for loop definitions and array/object indices in JavaScript, adhering to Flot's style guidelines.

```javascript
    for ( var i = 0; i < data.length; i++ ) {  // This block is wrong!
        if ( data[ i ] > 1 ) {
            data[ i ] = 2;
        }
    }

    for (var i = 0; i < data.length; i++) {  // This block is correct!
        if (data[i] > 1) {
            data[i] = 2;
        }
    }
```

--------------------------------

### Bind Mouse Down Event

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Use this hook to set custom event handlers on the plot's event holder. This example shows how to bind a mousedown event to display mouse coordinates.

```javascript
function (plot, eventHolder) {
        eventHolder.mousedown(function (e) {
            alert("You pressed the mouse at " + e.pageX + " " + e.pageY);
        });
    }
```

--------------------------------

### Clickable Grid Event Binding

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Shows how to enable click events on the grid and bind a handler to the 'plotclick' event. This allows for interaction with data points on the plot.

```javascript
$.plot($("#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!");
    }
});
```

--------------------------------

### Custom Legend Label Formatting

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Use a labelFormatter function to customize how series labels appear in the legend, for example, to make them clickable links. Returning null will hide the series from the legend.

```javascript
labelFormatter: function(label, series) {
    // series is the series object for the label
    return '<a href="#' + label + '">' + label + '</a>';
}
```

--------------------------------

### Resize Plot Canvas

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Resizes the drawing canvas to match the placeholder dimensions. Requires setupGrid() and draw() to be called afterwards.

```javascript
resize()
```

--------------------------------

### Convert Time to Timestamp in Ruby

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

In Ruby, multiply the result of `Time.now.to_i` by 1000 to get a JavaScript timestamp. This applies to `Time`, `DateTime`, and `ActiveSupport::TimeWithZone` objects when using the `active_support` gem.

```ruby
Time.now.to_i * 1000     # => 1383582043000
# ActiveSupport examples:
DateTime.now.to_i * 1000 # => 1383582043000
ActiveSupport::TimeZone.new('Asia/Shanghai').now.to_i * 1000
```

--------------------------------

### Basic Plotting Function

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/README.md

Use the $.plot function to render a graph in the specified placeholder. This requires data and options objects.

```javascript
$.plot($("#placeholder"), data, options);
```

--------------------------------

### Plot Hooks Overview

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Groundhogg's Plot object provides hooks that can be used to modify the plotting process at various stages. These hooks are functions that get access to internal data structures.

```APIDOC
## Plot Hooks

In addition to the public methods, the Plot object also has some hooks that can be used to modify the plotting process. You can install a callback function at various points in the process, the function then gets access to the internal data structures in Flot.

Here's an overview of the phases Flot goes through:

  1. Plugin initialization, parsing options
  
  2. Constructing the canvases used for drawing

  3. Set data: parsing data specification, calculating colors,
     copying raw data points into internal format,
     normalizing them, finding max/min for axis auto-scaling

  4. Grid setup: calculating axis spacing, ticks, inserting tick
     labels, the legend

  5. Draw: drawing the grid, drawing each of the series in turn

  6. Setting up event handling for interactive features

  7. Responding to events, if any

  8. Shutdown: this mostly happens in case a plot is overwritten 

Each hook is simply a function which is put in the appropriate array. 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.

```js
  // 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] } });

  // 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 hooks in the plugins bundled with Flot.
```

--------------------------------

### JavaScript Comment Formatting

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/CONTRIBUTING.md

Illustrates the required formatting for JavaScript comments, including jsDoc for headers and // for inline/block comments, with specific spacing requirements.

```javascript
    var a = 5;

    // We're going to loop here
    // TODO: Make this loop faster, better, stronger!

    for (var x = 0; x < 10; x++) {}
```

--------------------------------

### Series Options Schema

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Defines the structure for customizing series appearance, including lines, points, and bars. These global options are applied to all series unless overridden individually.

```javascript
series: {
    lines, points, bars: {
        show: boolean
        lineWidth: number
        fill: boolean or number
        fillColor: null or color/gradient
    }

    lines, bars: {
        zero: boolean
    }

    points: {
        radius: number
        symbol: "circle" or function
    }

    bars: {
        barWidth: number
        align: "left", "right" or "center"
        horizontal: boolean
    }

    lines: {
        steps: boolean
    }

    shadowSize: number
    highlightColor: color or number
}

colors: [ color1, color2, ... ]
```

--------------------------------

### Gradient Fill for Bars

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Configure bars to use a gradient fill that makes them gradually disappear from top to bottom. Set 'show: true', 'fill: true', and specify the 'fillColor' with opacity settings.

```javascript
bars: {
    show: true,
    lineWidth: 0,
    fill: true,
    fillColor: { colors: [ { opacity: 0.8 }, { opacity: 0.1 } ] }
}
```

--------------------------------

### Legend Configuration Object

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Defines the structure and available properties for customizing the legend's display and functionality.

```javascript
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,
    sorted: null/false, true, "ascending", "descending", "reverse", or a comparator
}
```

--------------------------------

### Correct JavaScript Conditional Statement Wrapping

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/CONTRIBUTING.md

Shows the correct way to write JavaScript conditional statements without arbitrary wrapping, prioritizing readability and adhering to the 80-character limit where appropriate.

```javascript
    if (a == 1 &&    // This block is wrong!
        b == 2 &&
        c == 3) {}

    if (a == 1 && b == 2 && c == 3) {}  // This block is correct!
```

--------------------------------

### Placeholder Div with Inline Styles

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/README.md

Set the width and height of the placeholder div directly using inline styles. This is crucial for Flot to correctly scale the graph.

```html
<div id="placeholder" style="width:600px;height:300px"></div>
```

--------------------------------

### Check Groundhogg Activation

Source: https://github.com/groundhoggwp/groundhogg/blob/master/gh-cron.txt

Verifies if Groundhogg is active. If not, the script terminates to prevent errors.

```php
// Check if Groundhogg is active...
if ( ! defined( 'GROUNDHOGG_VERSION' ) ) {
	die();
}
```

--------------------------------

### JavaScript Inverse (Reversed) Y-Axis Transformation

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Demonstrates how to reverse the order of values on a y-axis by using a simple negation transform and inverseTransform function.

```javascript
yaxis: {
    transform: function (v) { return -v; },
    inverseTransform: function (v) { return -v; }
}
```

--------------------------------

### processOptions Hook

Source: https://github.com/groundhoggwp/groundhogg/blob/master/assets/lib/flot/API.md

Called after Flot has parsed and merged options. Useful for enabling/disabling other options based on plugin activation.

```APIDOC
## processOptions Hook

- processOptions  [phase 1]

    ```function(plot, options)```
   
    Called after Flot has parsed and merged options. Useful in the
    instance where customizations beyond simple merging of default
    values is needed. A plugin might use it to detect that it has been
    enabled and then turn on or off other options.
```