Region classifiers

A region classifier specifies the format and location for an object. A classifier might be a 2-dimensional rectangle for an image, a line of text in a document, a time duration in a video, and so on. To define a region, select the region classifier that matches the type of content you're trying to use. For example, if your content is text, you're likely going to use either the txt or line region classifier. To see an example of a region classifier, see Manage comments and replies.

The following is a list of the region classifiers included with the Google Drive API:

rect

A rectangle in a 2-dimensional image.

Property	Description	Type
x	Position on the x axis, units default to pixels for images and percent for PDFs.	Double
y	Position on the y axis, units default to pixels for images and percent for PDFs.	Double
w	Length on the x axis, units default to pixels for images and percent for PDFs.	Double
h	Length on the y axis, units default to pixels for images and percent for PDFs.	Double
mw	The full width of the document when the comment was made. Use this to make x and w unitless since they can act like a percentage.	Double
mh	The full height of the document when the comment was made. See mw above for purpose.	Double
r	The degrees of rotation of the document. For example, if an image is rotated 90 degrees clockwise then a rectangle at 0,0 displays in the top right of the image. Should be one of 0, 90, 180, 270.	Double

page

A page number in a PDF, TIFF, or other document with pages. Use this for documents with page-like elements (such as a spreadsheet, slide, or layer).

Property	Description	Type
p	The page number (0-indexed).	Integer
mp	The number of pages in this document.	Integer

time

A duration of time in a video or other document with a time dimension.

Property	Description	Type
t	The start time.	hh:MM:ss.frac formatted time string (where M = minutes, m = millis; hours and minutes are optional)
d	The duration of the time range.	hh:MM:ss:mmm formatted time string (where M = minutes, m = millis)
md	The full-time duration of the document.	hh:MM:ss:mmm formatted time string (where M = minutes, m = millis)

txt

A range of text in a document.

Property	Description	Type
o	Start offset (character offset from the start of the file).	Integer
l	The length of the text range.	Integer
ml	The length of this document in characters.	Integer

line

A specific line in a text file or any files with lines in it.

Property	Description	Type
n	Line number.	Integer
l	The length of the line range.	Integer
ml	The maximum number of lines in the file.	Integer

matrix

A location in a matrix-like structure. Used to define rows and columns in spreadsheet documents, or any other documents that have a row or column structure.

Property	Description	Type
c	The column number.	Integer
r	The row number.	Integer
w	The number of columns.	Integer
h	The number of rows.	Integer
mw	The maximum width.	Integer
mh	The maximum height.	Integer