Extends pict’s bounding box by adding the given amounts to the corresponding sides; ascent and descent are extended, too.
Truncates pict’s bounding box by removing the descent part.
Lifts pict relative to its baseline, extending the bounding-box height if necessary.
Drops pict relative to its ascent line, extending the bounding-box height if necessary.
Makes the descent 0 and the ascent the same as the height.
Assuming that sub-pict can be found within pict, shifts the overall bounding box to that of sub-pict (but preserving all the drawing of pict). The last element, as reported by pict-last is also set to (or (pict-last sub-pict) sub-pict).
Shifts the given pict’s bounding box to enclose the bounding boxes of all sub-picts (even laundered picts).
Returns a pict like pict, but with the last element (as reported by pict-last) set to sub-pict. The sub-pict must exist as a sub-pict (or path of sub-picts) within pict.
Propagates the last element of sub-pict to pict.
That is, use-last* is like use-last, but the last
element of sub-pict is used as the new last element for
pict, instead of sub-pict itself—