World: r3wp

I'm working hard on the translation of the linearGradient informations 
from SVG files   to AGG

and I have some asks

how to apply a matrix tranformation only over a grendient definition 
?

I think I handle web the creation of the rebol list of linear gradient

if you wants to write the "in" AGG/draw code that is based on my 
rebol linear gradient list there is the code and a sample file from 
InkScape

http://shadwolf.free.fr/svg-demo02.zip

Noticed you found some conversion numbers (where from?? ;) ), so 
here's a simple func to make use of them:

to-unit: func [s [string!]] [
	switch/default skip tail s -2 [
		"pt"	[1.25 * to decimal! copy/part s -2 + length? s]
		"pc"	[15 * to decimal! copy/part s -2 + length? s]
		"mm"	[3.543307 * to decimal! copy/part s -2 + length? s]
		"cm"	[35.43307 * to decimal! copy/part s -2 + length? s]
		"in"	[90 * to decimal! copy/part s -2 + length? s]
		"px"	[to decimal! copy/part s -2 + length? s]
	][
		to decimal! s
	]
]

Ashley yes  !!! You noticed right I found them deep hided in the 
SVG format documentation on W3C dedicated pages to SVG format ....

I copy past the conversion units into the script becaus I know that 
could be usefull but AS I was working on lineargradient and as it's 
a complicated part of the format SVG I had no time to make a conversion 
algorithm I glad to see that you make it  :)

the page where I found the conversion rules

http://www.w3.org/TR/SVG/coords.html

see chapter 7.10

I read most of the documentation but then make the link to AGG data 
structure is rather difficult

linearGradient for example are splitted the first one contain the 
coordonates systeme and tranfromation informations  the second one 
countains the colors involved and their order in the gradient

so you avac primitive(fill:url) ->LinearGRadient (coords) -> LinearGradient 
(colors order)

where do I plug the to-unit function ?

in svg-size

??

Yes, to-unit is called from svg-size; and also from "path d", stroke-width, 
fill-width, etc ... probably anywhere in SVG where we "expect" an 
integer or decimal! ;)

okay good stuf in it Vincent and I are planning to use the xml-to-object.r 
script from Brian Wisti to enbetter and make a more sophisticate 
support for our actual work upon SVG parsing translation and rendering 
into a VID  window

shadwolf, I'm not the author - just a guy who made it available in 
the Rebol library :-)

it says author hahah ;)

opkay so we are planning on the opportinity to use a REBOL tree object! 
structure to represente SVG datas :)

this in the goal to improve drastically the performance and be more 
performant  on some key issues like recursivity etc...

I make a base code but now I have to find a good code to exploit 
the relevent datas from the object tree

this means to interogate the content of the objet a gived level

then construc path to get data then translate this data to a draw 
equivalent exploitable datas

and fill the draw block with this data

my point is to make a recursif capapble code

for example my object is set into xml global variable

I I want to interrogate the first shape description on the top level 
( out of group blocks) I have to build a path like that xml/svg/path/1/d

or maybe build the path xml/svg/path then attribute to a temporary 
var the foreach ob  xml/svg/path [ ob processing ]

so to build the path we start xml/svg "/ " g or path  if g we seek 
3 thing transform field and path field or sub g field

I give you the code maybe this will be more clear

shadwolf.free.fr/svg-demo-shad04.r

oups sorry

wrong adress

http://shadwolf.free.fr/svg-demo-shad03.r

in this file we have xml-to-object function load-svg function (mostly 
empty there is where to put the data conversion and draw block construction) 
and the widget that start the program

and the windows where the draw block is shown

I solve this issue regarding object retriving information I will 
enhance this pont to make it recursif retriever

at this point code have not drastically change ... like 40% is the 
same code

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I'm still working full time on the S VG renderer. I'm close to be 
at the same level than the previous code but as I'm working with 
objects the code seems to be more fast ...

the recursivity treatement for g block are also easier to do

I still not soleve my matrix problems so until now I don't implement 
it into  the actual code

I don't know how to treat linearGradient too

hum xpdf.svg file shows me a problem with the use of xml-to-object 
 ... if you have serveral g block at the same level all g block are 
compacted into the same reference

so in Rebol tree object the g block can be a bloc of sub object or 
an object  ;)

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