Method Cairo.Context()->text_extents()
- Method
text_extents
 TextExtentstext_extents(string|zerotext)- Description
 Gets the extents for a string of text. The extents describe a user-space rectangle that encloses the "inked" portion of the text, (as it would be drawn by show_text()). Additionally, the x_advance and y_advance values indicate the amount by which the current point would be advanced by show_text().
Note that whitespace characters do not directly contribute to the size of the rectangle (TextExtents->width and TextExtents->height). They do contribute indirectly by changing the position of non-whitespace characters. In particular, trailing whitespace characters are likely to not affect the size of the rectangle, though they will affect the x_advance and y_advance values.
- Parameter 
text a string of text, or
0- Returns
 a TextExtents object which stores the results.