Gets whether the zoom ratio range is continuous. If it is not continuous, it means that only the value in the key gear can be set. If continuous, it means that any value between the minimum value and maximum value in the key gear can be set. Take M3T as an example: isContinuous is TRUE, and the key gears are: [1,2,4,7,28,56], which means that any value of [1,56] can be set.
Return:
boolean
Returns whether the zoom ratio range is continuous.