/**
* Constructor.
* @param[in] startPosition The starting point onto which the 0% gradient stops are mapped.
* @param[in] endPosition The ending point r onto which the 100% gradient stops are mapped.
*/
/**
* Constructor.
* @param[in] startPosition The starting point onto which the 0% gradient stops are mapped.
* @param[in] endPosition The ending point r onto which the 100% gradient stops are mapped.
*/