Some questions regarding transformations in SVG

Hello world,

as I try to code some applications realized with SVG where I need 
transformations, several questions arised:

1. Currently, only affine transformations are achievable in SVG. This 
seems not to be changed for SVG2. Were there ever any discussions, or 
efforts, to allow non-affine transformations in SVG?

2. When scaling (parts of) a presentation, all the strokes, patterns, 
markers, ... are also scaled. In SVG Tiny 1.2, a "non-scaling-stroke" 
value for an attribute "vector-effect" was introduced, and I read 
happily that this is intended to be part of SVG2, as well. But as far as 
I understand, this refers only to the stroke property (this is what its 
name says) - is something similar intended for fill patterns, markers, 
whatever? And even further - may I have non-scaling annotations (textual 
or graphical) as part of a scaled object? The usecase might be just the 
same as the one which is described in SVG2 for the "non-scaling-stroke" 
- scalable maps with roads realized via a non-scaling stroke, the roads 
keeping their size when scaling the map, and I would additionally like 
to annotate those roads with their names, I would like to mark them and 
fill them with special patterns (in order to present them as highways, 
footpaths, railroads, ...).

3. And last, but not least, when I have several transformation contexts, 
may I have elements using coordinates from both contexts at the same 
time (e.g. a line from a special coordinate in one context leading to 
another special coordinate in the other context)? The usecase might be 
the same as before - this time I would like to have a fixed-positioned 
map legend and a scaling and moving sector of the map. Or I might have 
two sectors of the same map in different scales, and references (lines, 
curves, ...) from coordinates within the one sector to coordinates in 
the other sector. The "reference points" (or "ports") discussed within 
the "connector proposals for SVG" might help for that, but in all 
proposals discussed so far within the working group, only a special 
"connector" element may use such reference points, and this might not 
help if I would like to have graphical shapes which are not part of the 
shapes available for a connector, e.g. a rectangle with one corner point 
in one context, and the other corner point in the other context. So, 
what should be the solution for that in SVG[2]? Or is it and will it 
just be impossible, even in SVG2?

Thanks in advance for any illuminating answers!

Juergen Roethig

Received on Friday, 14 November 2014 11:56:02 UTC