Envelope.fromCenter constructor
- ArcGISPoint center, {
 - required double width,
 - required double height,
 - double? depth,
 
Creates an envelope from a center point and a width, height, and depth.
The spatial reference of the resulting envelope comes from the center point.
Parameters:
center— The center point for the envelope.width— The width of the envelope around the center point.height— The height of the envelope around the center point.depth— The depth of the envelope around the center point.