some asciisvg questions

[Marc Grober]

I am working on a lesson for teachers using asciimath and
asciisvg and have come up against the following:

1) Is there an existing way to do subscripts in asciisvg? I
want to identify a point as (x_1, y_1), is there a way to do
it without have to start a new text directive that shifts
the y value of the subscript?

2) What about text orientation, as in selecting a ray along
which the text is displayed and orienting the text to the
ray.....

Paul and SA, have you looked at text options at all in
your versions?

[miedema]

Just place it between `` so (`x_1`,`y_`) or `(x_1,y_1)` in my version
this works perfectly. I also added rotation to the text command, so
you can rotate text in any angle.

>  smime.p7s
> 4KViewDownload

[miedema]

By the way, just check the examples at www.fullxml.org

> > 4KViewDownload- Hide quoted text -
>
> - Show quoted text -

[Paulo Soares]

Hi Marc,

1) I'm pretty sure that asciisvg suports mathml over the svg picture
with the text command, e.g., text((1,1),"`(x_1,y_1)`").

2) my version allows the rotation and translation of elements
(including text except mathml over svg as in the previous point). I
believe it is not possible to do it with Peter's code.

--
Paulo Soares

>  smime.p7s
> 4KVerTransferir

[Marc Grober]

Yes, that seems to work fine.... brain fart in that single
quote broke the text function and haven't identified the
escape sequence (backslash does not work), which is a
separate issue....

I did notice that using `y=1/3x+2` inside svg resulted in
the insertion of the implied dot, which can be eliminated
with `y=1/3\x+2`

should I want to now combine the fallback version I am now
using with your version or SA's version it could amount to
quite a bit of work making sure there are inconsistencies in
the myriad functions.... so I think a core script with
libraries for incremental functioning would be a great idea,
but I think that also means some rewriting of the core to
make it, well, more transparent, and perhaps adding a line
that simply references any library found to be in the same
directory??

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[miedema]

Also look at: http://www.fullxml.org/dredging/media/excersises/cutting.html
I'm busy making an interactive course and in the figure you see the
indices.

On Apr 28, 6:45 pm, Marc Grober <m...@interak.com> wrote:

>  smime.p7s
> 4KViewDownload

[David Lippman]

I haven't gone digging through the code yet... Does the `` approach overlay MathML in HTML divs over the SVG, or does it actually use SVG text elements?

[Marc Grober]

I would think that the appearance of the implied dot
suggests that it is using SVG elements, no?

[Marc Grober]

Intriguing....
the backslash will delete the next text svg character except
the implied dot, so text(z,"4\th") deletes the t and
produces 4h, while text(z, "4th") inserts the implied dot
between 4 and t..... but the backslash will not operate
on the single quote, and text(z,"Don't do this") will cause
an error ....

[miedema]

Its using div elements inside the mml div, when you refresh or resize,
in IE the contents of the mml div is ereased, resulting in a new svg
picture, in firefox its not erased and every object should have an id
otherwise it will be drawn twice.

For the rotation you can do the following:

function rotate(id, p, angle) {
var node, rotatestr;
rotatestr = "";
if (id!=null) {
node = doc.getElementById(id);
var xangle = p[0]*xunitlength+origin[0];
var yangle = height-p[1]*yunitlength-origin[1];
rotatestr = " translate("+xangle+","+yangle+") rotate("+angle+")
translate(-"+xangle+",-"+yangle+")";
node.setAttribute("transform",rotatestr);
}
return rotatestr;
}

In this function id is the id of an existing object, so give your text
an id and refer to it in this function.
p is to point to rotate around so p=[x,y];
angle is the rotation angle in degrees.

Here you also have the functions for the other transformations:

function translation(id, p) {
var node, translatestr;
translatestr = "";
if (id!=null) {
node = doc.getElementById(id);
var xangle = p[0]*xunitlength;
var yangle = -p[1]*yunitlength;
translatestr = " translate("+xangle+","+yangle+")";
node.setAttribute("transform",translatestr);
}
return translatestr;
}

function skewx(id, p, angle) {
var node, skewxstr;
skewxstr = "";
if (id!=null) {
node = doc.getElementById(id);
var xangle = p[0]*xunitlength+origin[0];
var yangle = height-p[1]*yunitlength-origin[1];
skewxstr = " translate("+xangle+","+yangle+") skewX("+angle+")
translate(-"+xangle+",-"+yangle+")";
node.setAttribute("transform",skewxstr);
}
return skewxstr;
}

function skewy(id, p, angle) {
var node, skewystr;
skewystr = "";
if (id!=null) {
node = doc.getElementById(id);
var xangle = p[0]*xunitlength+origin[0];
var yangle = height-p[1]*yunitlength-origin[1];
skewystr = " translate("+xangle+","+yangle+") skewY("+angle+")
translate(-"+xangle+",-"+yangle+")";
node.setAttribute("transform",skewystr);
}
return skewystr;
}

function scale(id, p, scalex, scaley) {
var node, scalestr;
scalestr = "";
if (id!=null) {
node = doc.getElementById(id);
var xangle = p[0]*xunitlength+origin[0];
var yangle = height-p[1]*yunitlength-origin[1];
scalestr = " translate("+xangle+","+yangle+") scale("+scalex
+","+scaley+") translate(-"+xangle+",-"+yangle+")";
node.setAttribute("transform",scalestr);
}
return scalestr;

}


On Apr 28, 8:53 pm, Marc Grober <m...@interak.com> wrote:
> I would think that the appearance of the implied dot
> suggests that it is using SVG elements, no?
>
>
>
> David Lippman wrote:
> > I haven't gone digging through the code yet... Does the `` approach overlay MathML in HTML divs over the SVG, or does it actually use SVG text elements?
>
> > -----Original Message-----
> > From: asci...@googlegroups.com [mailto:asci...@googlegroups.com] On Behalf Of miedema
> > Sent: Tuesday, April 28, 2009 10:54 AM
> > To: ASCIIMath
> > Subject: [ASCIIMath] Re: some asciisvg questions
>
> > Just place it between `` so (`x_1`,`y_`) or `(x_1,y_1)` in my version this works perfectly. I also added rotation to the text command, so you can rotate text in any angle.
>
> > On Apr 28, 6:45 pm, Marc Grober <m...@interak.com> wrote:
> >> I am working on a lesson for teachers using asciimath and asciisvg and
> >> have come up against the following:
>
> >> 1) Is there an existing way to do subscripts in asciisvg?  I want to
> >> identify a point as (x_1, y_1), is there a way to do it without have
> >> to start a new text directive that shifts the y value of the
> >> subscript?
>
> >> 2) What about text orientation, as in selecting a ray along which the
> >> text is displayed and orienting the text to the ray.....
>
> >> Paul and  SA,  have you looked at text options at all in your
> >> versions?
>
> >>  smime.p7s
> >> 4KViewDownload
>
> > >
>
>

[miedema]

I removed this because I wanted to be able to use multi character
indices, for examle F_hydr for a hydraulic force, the original
ASCIIMathML would place a multiplication dot between the "h" and the
"y".
In the examples I mentioned on my website, long indices work
perfectly.

[Marc Grober]

Curious part is that the version I am using does F_hydr
without any problem, unless I put it inside the asciisvg
text function (although I have to do F_(hydr) or it assumes
the y is a separate variable.) Where it does add a dot (as
in `y=1/3x+2`, as I noted earlier, I can avoid the dot by
backslashing so `y=1/3\x+2`

[miedema]

I know this, but I want to use the same equation for svg and for my
calculations, so the syntax should match the javascript syntax.