Resize a bounding box object by a scale factor or buffer distance
Details
You can resize a bounding box by passing a value for scale or buff, but not both.
Use scale to resize the bounding box with a scale factor. Values of scale < 1 will
result in a smaller bounding box, values > 1 will result in a larger bounding box. The centroid will
remain the same. If you pass two values for scale, they'll be used to scale the x and y
dimensions respectively
Use buff to resize the bounding box with a fixed distance. buff should be in a map units.
Values of buff < 0 will result in a smaller bounding box. Values > 0 will result in a larger
bounding box. If you pass two values for buff, they'll be used to buffer the x and y
dimensions respectively