Module bbox

The bbox` module contains the definition of the bbox class representing bounding boxes of graphical elements like paths, canvases, etc. used in PyX. Usually, you obtain bbox instances as return values of the corresponding bbox()) method, but you may also construct a bounding box by yourself.

bbox constructor

The bbox constructor accepts the following keyword arguments

keyword	description
llx	None (default) for \(-\infty\) or \(x\)-position of the lower left corner of the bbox (in user units)
lly	None (default) for \(-\infty\) or \(y\)-position of the lower left corner of the bbox (in user units)
urx	None (default) for \(\infty\) or \(x\)-position of the upper right corner of the bbox (in user units)
ury	None (default) for \(\infty\) or \(y\)-position of the upper right corner of the bbox (in user units)

bbox methods

bbox method	function
intersects(other)	returns 1 if the bbox instance and other intersect with each other.
transformed(self, trafo)	returns self transformed by transformation trafo.
enlarged(all=0, bottom=None, left=None, top=None, right=None)	return the bounding box enlarged by the given amount (in visual units). all is the default for all other directions, which is used whenever None is given for the corresponding direction.
path() or rect()	return the path corresponding to the bounding box rectangle.
height()	returns the height of the bounding box (in PyX lengths).
width()	returns the width of the bounding box (in PyX lengths).
top()	returns the \(y\)-position of the top of the bounding box (in PyX lengths).
bottom()	returns the \(y\)-position of the bottom of the bounding box (in PyX lengths).
left()	returns the \(x\)-position of the left side of the bounding box (in PyX lengths).
right()	returns the \(x\)-position of the right side of the bounding box (in PyX lengths).

Furthermore, two bounding boxes can be added (giving the bounding box enclosing both) and multiplied (giving the intersection of both bounding boxes).