function chart_unique_color in Google Chart Tools: Image Charts 7

Same name and namespace in other branches

1. 5 chart.module \chart_unique_color()
2. 6 chart.module \chart_unique_color()

Supplies a unique color.

When an assoc array color scheme is provided $content_id can be used to sync the color to the data rendered. Otherwise the next available color in the stack is assigned to $content_id

Parameters

string $content_id:

string $scheme: (optional) Color scheme.

Return value

string hex RGB value

2 calls to chart_unique_color()

chart_views_plugin_style_chart::render in chart_views/views/chart_views_plugin_style_chart.inc

Render the display in this style.

system_charts_build in system_charts/system_charts.module

Gather data and build a chart API structure.

File

./chart.module, line 1302

Provides primary Drupal hook implementations.

Code

function chart_unique_color($content_id, $scheme = 'default') {
  $colors_used =& drupal_static(__FUNCTION__);
  $colors = chart_color_schemes();

  // Revert to default color schema if $scheme has not been registered.
  if (!isset($colors[$scheme])) {
    $scheme = 'default';
  }

  // This content_id has already been color-mapped
  if (isset($colors_used[$scheme][$content_id])) {
    return $colors_used[$scheme][$content_id];
  }

  // Specific associative color is available
  if (isset($colors[$scheme][$content_id])) {
    return $colors_used[$scheme][$content_id] = $colors[$scheme][$content_id];
  }

  // Map first unused color from color scheme
  if (isset($colors_used[$scheme])) {
    $available_colors = array_diff($colors[$scheme], $colors_used[$scheme]);
    return $colors_used[$scheme][$content_id] = array_shift($available_colors);
  }
  else {
    return $colors_used[$scheme][$content_id] = array_shift($colors[$scheme]);
  }
  return '000000';
}