compare linear animateMotion and animateTransform
Comparing linear animateMotion with animateTransform
for a rectangle.
animateTransform is blue and covers completely
the red animateMotion. Dark red uses the mpath element,
light red the path attribute.
The path consists of three simple lines as subpaths indicated in gray.
Except the initial M command the other M commands do not count
for the timing of the linear animation.
If something red gets visible, an error is occured.
calcMode linear
dark red: animateMotion calcMode linear using mpath
light red: animateMotion calcMode linear using path
blue: animateTransform calcMode linear