Brightness filters

The code below is the source for this graph.

<?php
// Brightness filters
require_once 'SVGGraph/autoloader.php';

$settings = [
  'auto_fit' => true,
  'back_stroke_width' => 0,
  'grid_colour' => '#666',
  'stroke_width' => 2,
  'show_tooltips' => false,
  'axis_font_size' => 12,
  'grid_division_v' => 2,
];

$values = [
  'default' => 11,
  '50%' => 10,
  '75%' => 9,
  'no filter' => 10,
  '150%' => 9,
  '200%' => 10
];
$colours = [
  '#b04040/brightness',
  '#b04040/brightness(50%)',
  '#b04040/brightness(75%)',
  '#b04040',
  '#b04040/brightness(150%)',
  '#b04040/brightness(200%)',
];

$graph = new Goat1000\SVGGraph\SVGGraph(670, 200, $settings);
$graph->colours($colours);
$graph->values($values);
$graph->render('BarGraph');

Please note: the source code above comes from a script used to generate one of the example graphs on the site. This is simply a wrapper page to apply highlighting and make the source code easier to read, so there is no content here to describe what the source code is doing.