function populate()
{
$orders = new SInvoiceCollection(new SInvoice());
$customersales = $orders->getSalesHistory();
$db =& DB::Instance();
$param = new GLParams();
$currency_symbol = utf8_decode($param->base_currency_symbol());
$options = array();
$options['header']['text'] = 'Sales this month ' . $param->base_currency_symbol() . $customersales['current']['this_month_to_date']['value'];
$options['header']['text'] .= ' : this week ' . $param->base_currency_symbol() . $customersales['current']['this_week']['value'];
$options['header']['text'] .= ' : last week ' . $param->base_currency_symbol() . $customersales['current']['last_week']['value'];
$options['header']['textStyle']['font-size'] = '14pt';
ksort($customersales['previous']);
$options['date_axis'] = TRUE;
$sales_counter = 0;
// build up data array
foreach ($customersales['previous'] as $period => $value) {
$date = explode('/', $period);
$data['x'][] = $date[1] . "/1/" . $date[0];
$data['y'][] = (double) $value['value'];
$label[0][$sales_counter++] = number_format($value['value'], 2);
}
$options['seriesList'][] = array('legendEntry' => FALSE, 'data' => $data, 'date_axis' => array('x' => TRUE), 'markers' => array('visible' => TRUE, 'type' => 'circle'));
$options['type'] = 'line';
$options['identifier'] = __CLASS__;
$options['labels'] = $label;
$this->contents = json_encode($options);
}
