'lc', 'hbar2D' => 'bhg', 'vbar2D' => 'bvg', 'pie2D' => 'p', 'pie3D' => 'p3', 'venn' => 'v', 'scatter' => 's', ); if (empty($options[$data['#type']])) { return t('This type is not possible using %chartplugin', array('%chartplugin' => 'Google Chart')); } $chart[] = 'cht='. $options[$data['#type']]; // Convert the chat SIZE into the Google Chart way. // Since its a requirement to build the chart on Google, if the value // was not found, return nothing and stop the execution. if (empty($data['#width']) or empty($data['#height'])) { return t('Height and Width are required'); } $chart[] = 'chs='. $data['#width'] .'x'. $data['#height']; // Add Title and Description to the chart if (!empty($data['#title'])) { $chart[] = 'chtt='. $data['#title']; } // Chart background color. Since the default color // is white (#ffffff), only different colors are considered if (!empty($data['#color']) and $data['#color'] != 'ffffff') { $chart[] = 'chf=bg,s,'. $data['#color']; } return; } /** * Encode the Chart data into a Alphanumeric code, follwing the * Google Chart API instruction. Its needed because there is a * size limmit to URL strings. So we reduce the amount of characters. * * It basicly uses a scale of 61 levels to represent each chart * value. If a more precise scale is needed, see * _google_charts_codingextended(), which produces a 4000 levels, * but also a bigger URL string. * * @param $data * Array. A series of numeric data values * @return * String. The string presentation of series data */ function _google_charts_data_codingsimple($value, $max) { // Set the list of characters and the size of the list $simple = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; $simple_len = drupal_strlen($simple) - 1; if ($value >= 0) { return $simple[round($simple_len * $value / $max)]; } else { return '_'; } } /** * Implementation of hook_charts_render(). * * Its a Charts module hook. It transform the data into a HTML chart. * * @param &$data * Array. The */ function _google_charts_render(&$data) { $chart = array(); if ($message = _google_charts_chart($chart, $data)) { return $message; } // Convert the chat DATA into the Google Chart way. // Since its a requirement to build the chart on Google, if the value // was not found, return nothing and stop the execution. if ($message = _google_charts_series($chart, $data)) { return $message; } // If its all ok, build the HTML img tag return ''; } /** * Convert all Series-level data. * * @param &$chart * Array. The array that will be converted into a string for Google Charts * @param &$data * Array. The raw data. * @return * String. The string presentation of series data */ function _google_charts_series(&$chart, &$data) { // The final output is going to be build $chart_data = ''; $value_labels = array(); // For each chart value, encode it // Note: Underscore represents a missing value foreach (element_children($data) as $series) { // Include a series separator if (!empty($chart_data)) { $chart_data .= ','; } // Get only the numeric values from the series $series_data = _charts_series_values($data[$series]); // Get the highest value on the series, to be a reference point $max = max($series_data); // Value labels: temporary array. $value_labels_temp = array(); // For each series of data, scan it foreach (array_keys($series_data) as $value) { $chart_data .= _google_charts_data_codingsimple($series_data[$value], $max); $value_labels_temp[] = empty($data[$series][$value]['#label']) ? NULL : $data[$series][$value]['#label']; } // Value labels if (!empty($value_labels_temp)) { $value_labels += $value_labels_temp; } // Series legends $legends[] = empty($data[$series]['#legend']) ? NULL : $data[$series]['#legend']; // Series colors $colors[] = empty($data[$series]['#color']) ? NULL : $data[$series]['#color']; } // Return the series of data if (empty($chart_data)) { return t('No enough data to create a chart.'); } // Insert data $chart[] = 'chd=s:'. $chart_data; // Insert series legend $legends = implode('|', $legends); if (str_replace('|', '', $legends)) { $chart[] = 'chdl='. $legends; } // Insert series legend $colors = implode(',', $colors); if (str_replace(',', '', $value_labels)) { $chart[] = 'chco='. $colors; } // Insert values legend $value_labels = implode('|', $value_labels); if (str_replace('|', '', $value_labels)) { $chart[] = 'chl='. $value_labels; } return; }