public function toString()
{
$typeString = GoogleChartAxisType::getParamName() . '=';
$rangeString = GoogleChartDataRange::getParamName() . '=';
$labelsString = null;
$types = $ranges = $labels = array();
$i = 0;
foreach ($this->axes as $axis) {
$types[] = $axis->getType()->toString();
if ($range = $axis->getRange()) {
$ranges[$i] = $i . ',' . $range->getMin() . ',' . $range->getMax();
}
if ($interval = $axis->getInterval()) {
$ranges[$i] .= ',' . $interval;
}
if ($label = $axis->getLabel()) {
$labels[$i] = $label;
}
$i++;
}
$typeString .= implode(',', $types);
$rangeString .= implode('|', $ranges);
if ($labels) {
$labelsString = '&' . GoogleChartAxisLabel::getParamName() . '=';
foreach ($labels as $index => $label) {
$labelsString .= $index . ':|' . $label->toString();
}
}
return $typeString . '&' . $rangeString . $labelsString;
}
