Position Specification
Various taccgl™Methods (e.g. position, from,
to) receive parameters denoting a point in 3D space. These
methods either take 2 or 3 numerical parameters ((x,y)
or (x,y,z)) or an object usually written using curley brackets
as {positioning options}. In the case of 2 numerical parameters
z=0 is assumed.
Position calculation is based on a transition t per default
the transition object, whose method was called. Calculation
per default starts with the current from value of t
or if given the value of the x,y, or z option,
or if given the position of el.
option  Meaning 
x:number, y:number, z:number
 Specifies coordinate values directly. 
ox:number, oy:number, oz:number
 Specifies coordinate offsets that are added to the coordinates at the end. 
rx:number, ry:number, rz:number
 Specifies relative coordinates within the coordinate system
of the current transition. So {rx:1,ry:0,rz:0} refers to the top right
corner; {rx:0,ry:1,rz:0} to the bottom left corner, {rx:0.5,ry:0.5,rz:0.5}
to the point in the center.

el:id, ex:number, ey:number
 id must be the id of an HTML element (or a DOM node).
The coordinates specify relative coordinates within the coordinate system
of the specified HTML element. So {ex:1,ey:0} refers to the top right
corner; {ex:0,ey:1} to the bottom left corner, {ex:0.5,ey:0.5}
to the point in the center.

t:transition  Makes
position calculation based on the specified transition. 
pt:number  Usually the calculation
is based on the from value of t. For pt:1
calculation is based on the to value. In general it is based
on from*(1pt) + to*pt . 
rt:number  If this is a
resizing transition, then rt:1 means to take the destination
size as basis for the calculation. In general from_size*(1rt) + to_size*pt
is used as size. The size of the current transition is important
for scaling rx, ry, rz.

