dennis@dennis.colorado.edu (02/03/90)
The Openwindows code is using a new, apparently undocumented operator called getbbox. It signature seems to be this: canvas bool => x y w h where at least the w and h depend on the current scale. Can anyone enlighten me as to the semantics of getbbox? -Dennis Heimbigner (dennis@boulder.colorado.edu)
naughton@wind.Sun.COM (Patrick Naughton) (02/06/90)
>>> The Openwindows code is using a new, apparently undocumented >>> operator called getbbox. >>> It signature seems to be this: >>> canvas bool => x y w h >>> where at least the w and h depend on the current scale. >>> Can anyone enlighten me as to the semantics of getbbox? >>> -Dennis Heimbigner >>> (dennis@boulder.colorado.edu) I'm not sure why it wasn't documented, but here's what it does: canvas|string true => llx lly urx ury canvas|string false => llx lly w h These return the bounding box of the canvas or string in the current ctm. The 'false' case simply does the subtraction of the lower-left from the upper-right and returns the width and height, suitable for passing to 'rectpath'. PS> /cv framebuffer newcanvas def PS> 0 0 100 200 rectpath cv reshapecanvas PS> 300 400 cv movecanvas PS> cv false getbbox pstack clear 300.0 400.0 100.0 200.0 PS> cv setcanvas PS> cv false getbbox pstack clear 0.0 0.0 100.0 200.0 PS> (Hello) false getbbox pstack clear 0.0 0.0 34.0 9.0 -Patrick ______________________________________________________________________ Patrick J. Naughton ARPA: naughton@sun.com Window Systems Group UUCP: ...!sun!naughton Sun Microsystems, Inc. AT&T: (415) 336 - 1080
rxb@ASC.SLB.COM (Rafael Bracho) (02/07/90)
The (undocumented) getbbox operator has the following syntax: object bool GETBBOX => x y x' y' where 'object' may be a string or a canvas. It will return the bounding box of the object in one of two forms: If 'bool' is true, the result is a "rect" (i.e., x' and y' are width and height, respectively), else, the result is a "bbox" (i.e., x' and y' are the corners of the upper-right corner, like in the 'pathbbox' operator). -Rafael