Compare from-to, from-by and by animateTransform scale with values animateTransform.
Compare from-to, from-by and by animateTransform scale with values animateTransform.
SMIL specifies, that from-to, from-by and by animations have to be the same
as the related values animation.
The conversion is as follows:
from="a" to="b" ... values="a;b"
from="a" by="b" ... values="a;a+b"
by="a" ... values="0;a" additive="sum"
(by and from-by animations have only a meaning, if values can be added somehow.
'0' is used as a general symbol for the neutral element of addition for the related attribute,
this means 0 + a = a + 0 = a. And '0' is not equal to the symbol '1' as the basic unit of the
related attribute, '0' is a predecessor of '1' in the related attribute space. For animateTransform
the '0' is the same as the zero matrix, not the unity or identity matrix.
For the scale type this is a scaling with 0,0, this means no display if not added to another
value. Deviating from SMIL in SVG it is specified, that for animateTranform the animation
effect has to be postmultiplied to the underlying value, if the animation is additive.)
The from-to, from-by and by are applied to animateTransform of the scale type
of different blue stroked
paths and are compared with the related values animations including additive and
cumulative behaviour for underlying red paths. Additionally underlying dark red
paths simulate the same behaviour using always the defaults additive replace and
accumulate none. The blue paths cover all red paths.
Therefore if something red gets visible, the test is failed.
from-to animateTransform scale
from-by animateTransform scale
by animateTransform scale
attributes noted:
cumulative/additive;
cumulative/not additive;
not cumulative/additive;
not cumulative/not additive