/**
* Sets the baseline for the axis.
*
* This option is only supported for a continuous axis.
*
* @param mixed Must match type defined for the column, [ number | jsDate ].
* @throws InvalidConfigValue
* @return Axis
*/
public function baseline($baseline)
{
if (Utils::isJsDate($baseline)) {
$this->baseline = $baseline->toString();
} else {
if (is_int($baseline)) {
$this->baseline = $baseline;
} else {
throw $this->invalidConfigValue(__FUNCTION__, 'int | jsDate', 'int if column is "number", jsDate if column is "date"');
}
}
return $this;
}
