[Fiware-miwi] the entity system

[Kristian Sons]

Hi,
> // Create a new mesh component:
> var mymesh = new x.ec.Mesh();
> mymesh.src = "teapot.xml#meshData"; //this can validate the attribute 
> etc. - i don't know if that's possible with plain DOM setAttribute

we have that for all simple data types in XML3D. The general semantic 
adapted from HTML and SVG:

You can set whatever values you want using the generic string-based DOM 
API. If the string does not evaluate to a valid 'typed' value, the 
internal typed value is reset to the default value
e.g.:

document.querySelector("view")

 1. <view id="defaultView" position="1 1.5 12.90000057220459"></view>

var v = document.querySelector("view");
undefined
v.fieldOfView = 0.5
0.5
v.getAttribute("fieldOfView")
"0.5"
v.setAttribute("fieldOfView", "asd")
undefined
v.fieldOfView
0.785398


For complex types (e.g. XML3DVec), the behavior is similar, but it's not 
possible to set the value directly (the DOM element 'owns' the reference 
to the object):

var t = document.querySelector("transform");
undefined
t.translation = new XML3DVec3(0,0,10);
Error: Can't set transform::translation: it's readonly
t.translation.set(new XML3DVec3(0,0,10));
undefined
t.getAttribute("translation")
"0 0 10"
t.translation.set(0,20,0);
undefined
t.getAttribute("translation")
"0 20 0"

For boolean values and enumerations there are some differences in the 
behavior. Again, we analyzed and copied the behavior of similar APIs in 
HTML and SVG DOM elements.

Best,
   Kristian







-- 
_______________________________________________________________________________

Kristian Sons
Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI
Agenten und Simulierte Realität
Campus, Geb. D 3 2, Raum 0.77
66123 Saarbrücken, Germany

Phone: +49 681 85775-3833
Phone: +49 681 302-3833
Fax:   +49 681 85775--2235
kristian.sons at dfki.de
http://www.xml3d.org

Geschäftsführung: Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster (Vorsitzender)
Dr. Walter Olthoff

Vorsitzender des Aufsichtsrats: Prof. Dr. h.c. Hans A. Aukes
Amtsgericht Kaiserslautern, HRB 2313
_______________________________________________________________________________

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