probably x / z = tan (theta/2)
right?
On Thu, Oct 7, 2010 at 10:57 AM, Pshemak Maslak <p...@chem.psu.edu> wrote:
> On 10/7/2010 9:11 AM, Robert Hanson wrote:
>
> Well, it's symmetry axis is along Z, so just shorten or lengthen Z to
> change the opening angle. Or change X and Y distances. Right?
>
>
> Yes, it works. Changing the z value (I presume) in vector type "2" changes
> the opening angle by moving the apex of the cone away from the origin along
> the z axis. So if I want to bring the apex back to the origin, I need to
> adjust the "z value" (I presume) of the origin from -5.0 to ?. My question
> is what is the relationship between these numbers.
>
> Thanks for your help and your patience.
>
> PM
>
> PS. [I do not (obviously) understand how the cone was constructed and what
> are the meanings of the volume vectors and how is the origin defined, so it
> is all by trial and error].
>
>
> On Wed, Oct 6, 2010 at 12:30 PM, Pshemak Maslak <p...@chem.psu.edu> wrote:
>
>> On 10/4/2010 1:14 PM, Robert Hanson wrote:
>>
>> yes, I think so. Just adjust the vector parameters to make it any size you
>> want.
>>
>>
>> The top of the jvxl file with the cone:
>> [...]
>> functionXY
>> curveAsStringXY
>> -2 -5.0 -5.0 -5.0 ANGSTROMS
>> </jvxlFileTitle>
>> <jvxlVolumeData origin="{-5.0 -5.0
>> -5.0}">
>> <<<< changing these changes origin
>> <jvxlVolumeVector type="0" count="51" vector="{0.2 0.0
>> 0.0}"></jvxlVolumeVector> <<<< changing these changes
>> size
>> <jvxlVolumeVector type="1" count="51" vector="{0.0 0.2
>> 0.0}"></jvxlVolumeVector> <<<< changing these changes
>> size
>> <jvxlVolumeVector type="2" count="51" vector="{0.0 0.0
>> 0.2}"></jvxlVolumeVector> <<<< changing these changes
>> size
>> [....]
>>
>> I can change the origin, or size or make it elliptic (if the vectors are
>> not the same), but I do not know how to change the opening angle.
>>
>>
>> Thanks for your help,
>>
>> PM
>>
>>
>> On Mon, Oct 4, 2010 at 11:08 AM, Pshemak Maslak <p...@chem.psu.edu> wrote:
>>
>>>
>>> On 10/1/2010 11:04 PM, Robert Hanson wrote:
>>> >
>>> > I lied. OK, see the JVXL file at
>>> >
>>> > http://stolaf.edu/people/hansonr/chemapps/jmol/docs/misc/cone.jvxl
>>> >
>>> > for a the surface z = sqrt(x^2 + y^2). Because it is a JVXL file, you
>>> > can go in and change the axes, change the scaling, change the origin,
>>> > etc., and have any cone you want. Even elliptical cones.
>>>
>>> Thank you very much for creating this nice cone. Can I change its
>>> opening angle directly in the jvxl file?
>>>
>>>
>>> >
>>> > This was created at
>>> >
>>> >
>>> http://chemapps.stolaf.edu/jmol/docs/examples-11/isosurface.htm?USSIGNEDAPPLET&topic=14
>>> > <
>>> http://chemapps.stolaf.edu/jmol/docs/examples-11/isosurface.htm?USSIGNEDAPPLET&topic=14
>>> >
>>> >
>>> > by entering
>>> >
>>> > Math.sqrt(x^2 + y^2) into the input box, clicking the link discussed
>>> > there to "set the function" and then issuing the following on the
>>> > command line:
>>> >
>>> > javascript "x0=-5;y0=-5;dx=.2;dy=.2";isosurface functionXY
>>> > "curveAsStringXY" {-5 -5 -5} {-51 0.2 0 0} {51 0 0.2 0} {51 0 0 0.2};
>>> >
>>> > followed by
>>> >
>>> > write isosurface "cone.jvxl"
>>>
>>> I tried that (under item 14, after zapping the preloaded model). I
>>> entered "Math.sqrt(x^2 + y^2)" into the box and clicked the "click here
>>> to set the function" link (confirmed by the message window). After
>>> entering the script (above) on the command line I am getting a very
>>> complicated "egg-box" shape.
>>>
>>> If I do not click on the "click here to set the function" link I get a
>>> half of an ellipsoid (a "cone" with parabolic cross-sections) with the
>>> above script..
>>>
>>> I am sure I am doing something wrong.
>>>
>>> All below is above my head (I speak no programming language :-(). And
>>> that is my problem.
>>>
>>> Thanks for your help,
>>>
>>> PM
>>>
>>>
>>> >
>>> >
>>> > That instructs Jmol to get the Z coordinate of the function from the
>>> > JavaScript function curveAsStringXY, which reads:
>>> >
>>> > function curveAsStringXY(app, nX, nY) {
>>> > var i1 = Math.abs(parseInt(""+nX));
>>> > var i2 = Math.abs(0.0 + parseInt(""+nY));
>>> > var s = ""
>>> > for (var i = 0; i < i1; i++)
>>> > for (var j = 0; j < i2; j++) {
>>> > s+= curveXY("",i, j) + "\n";
>>> > }
>>> > return s;
>>> >
>>> > }
>>> >
>>> >
>>> > x0 = 0
>>> > y0 = 0
>>> > dx = 1
>>> > dy = 1
>>> > x = 0
>>> > y = 0
>>> >
>>> > function curveXY(app, ix, iy) {
>>> > setXY(ix, iy)
>>> > return eval(myfunction);
>>> > }
>>> >
>>> > function setXY(ix, iy) {
>>> > x = ix * dx + x0
>>> > y = iy * dy + y0
>>> > }
>>> >
>>> >
>>> > function setFunction(f,isSilent){
>>> > myfunction =
>>> > (arguments.length<1?document.getElementById("fOfXY").value:f)
>>> > var x=1
>>> > var y=1
>>> > var z=NaN
>>> > try{eval("z="+myfunction)}catch(e){alert(e)}
>>> > if(isNaN(z)){
>>> > alert("Your function is invalid")
>>> > myfunction = "(x*x+y*y)"
>>> > }
>>> > try{curveXY("",1,1)}catch(e){alert(e);return}
>>> > if (!isSilent)alert("The function Jmol will use is now z=" +
>>> > myfunction)
>>> > }
>>> >
>>> > myfunction = "(x*x + y*y)/3"
>>> > setFunction(myfunction,1)
>>> >
>>> >
>>>
>>>
>>>
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>>
>>
>>
>> --
>> Robert M. Hanson
>> Professor of Chemistry
>> St. Olaf College
>> 1520 St. Olaf Ave.
>> Northfield, MN 55057
>> http://www.stolaf.edu/people/hansonr
>> phone: 507-786-3107
>>
>>
>> If nature does not answer first what we want,
>> it is better to take what answer we get.
>>
>> -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
>>
>>
>> ------------------------------------------------------------------------------
>> Virtualization is moving to the mainstream and overtaking non-virtualized
>> environment for deploying applications. Does it make network security
>> easier or more difficult to achieve? Read this whitepaper to separate the
>> two and get a better understanding.http://p.sf.net/sfu/hp-phase2-d2d
>>
>>
>> _______________________________________________
>> Jmol-users mailing
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>
>
> --
> Robert M. Hanson
> Professor of Chemistry
> St. Olaf College
> 1520 St. Olaf Ave.
> Northfield, MN 55057
> http://www.stolaf.edu/people/hansonr
> phone: 507-786-3107
>
>
> If nature does not answer first what we want,
> it is better to take what answer we get.
>
> -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
>
>
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> Spend less time writing and rewriting code and more time creating great
> experiences on the web. Be a part of the beta
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--
Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3.
Spend less time writing and rewriting code and more time creating great
experiences on the web. Be a part of the beta today.
http://p.sf.net/sfu/beautyoftheweb
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