NAME
Graphics::Grid::Grob - Role for graphical object (grob) classes in Graphics::Grid
VERSION
version 0.001
DESCRIPTION
This is the role for graphical object (grob) classes.
ATTRIBUTES
vp
A viewport object. When drawing a grob, if the grob has this attribute, the viewport would be temporily pushed onto the global viewport stack before drawing takes place, and be poped after drawing. If the grob does not have this attribute set, it would be drawn on the existing current viewport in the global viewport stack.
elems
Get number of sub-elements in the grob.
Grob classes shall implement a _build_elems() method to support this attribute.
CLASS METHODS
grob_name($prefix="GRID")
Generate a unique name for a grob.
METHODS
length
This is an alias of elems.
extents($grid)
Returns info about the grob's extents (bounding box, etc) on the drawing layer, in cm.
Note that not all grob classes have got this method implemented.
draw($grid)
This would call $grid->draw($self), which would further call the grob's _draw method.
_draw($grid)
make_context()
A hook to allow a grob class to modify its vp before being drawn.
SEE ALSO
AUTHOR
Stephan Loyd <sloyd@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2018-2023 by Stephan Loyd.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.