Figure markers

The code below is the source for this graph.

<?php
// Figure markers
require_once 'SVGGraph/autoloader.php';

$settings = [
  'auto_fit' => true,
  'show_axes' => false,
  'show_tooltips' => false,
  'back_stroke_width' => 0,
  'axis_max_h' => 10,
  'axis_max_v' => 16,
  'grid_division_v' => 2,
  'marker_type' => [
    'figure:box-blue',
    'figure:box-red',
    'figure:box-yellow',
    'figure:box-purple',
  ],
  'marker_size' => [15, 14, 15, 16],
  'grid_back_colour' => '#f9f9f9',
  'pad_left' => 5,
  'pad_top' => 5,
  'pad_right' => 5,
  'pad_bottom' => 5,
  'fill_under' => true,
  'fill_opacity' => 0.8,
  'figure' => [
    ['box-outer',
      ['polyline', 'points' => [
        -10, -10,
        -10, 10,
        10, 10,
        10, -10,
        -6, -22
        ], 'stroke-width' => 2
      ],
    ],
    ['box-blue',
      ['rect', 'x' => -10, 'y' => -10, 'width' => 20, 'height' => 20,
        'fill' => ['#33e', '#eef'], 'stroke' => 'none'],
      ['figure', 'x' => 0, 'y' => 0, 'name' => 'box-outer'],
    ],
    ['box-red',
      ['rect', 'x' => -10, 'y' => -10, 'width' => 20, 'height' => 20,
        'fill' => ['#e33', '#e66'], 'stroke' => 'none'],
      ['figure', 'x' => 0, 'y' => 0, 'name' => 'box-outer'],
    ],
    ['box-yellow',
      ['rect', 'x' => -10, 'y' => -10, 'width' => 20, 'height' => 20,
        'fill' => ['#ff1', '#ff8'], 'stroke' => 'none'],
      ['figure', 'x' => 0, 'y' => 0, 'name' => 'box-outer'],
    ],
    ['box-purple',
      ['rect', 'x' => -10, 'y' => -8, 'width' => 20, 'height' => 18,
        'fill' => ['#f0f', '#9cf'], 'stroke' => 'none'],
      ['figure', 'x' => 0, 'y' => 0, 'name' => 'box-outer'],
    ],
  ],
];

$values = [];
for($c = 4; $c > 0; --$c) {
  $values[] = [1 => 6 - $c, 2, 3, 2, 3, 2, 3, 2, 6 - $c];
}

$graph = new Goat1000\SVGGraph\SVGGraph(650, 200, $settings);
$graph->colours([
  ['#e11','#fff'],
  ['#1b1','#fff'],
  ['#11e','#fff'],
  ['#e71','#fff'],
  ['#333','#fff'],
]);
$graph->values($values);
$graph->render('StackedLineGraph');

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.