Success! Attached is patch with Javascript that creates structure to create a mesh made of triangles forming a polygon with x sides. 3 = triangle, anything above 40 looks pretty identical to a perfect circle. You might want to do some 'morphing' between shapes (eg triangle to square), but that's beyond my abilities.
It may be handy to others. (BTW I'm drawing every second triangle
facing the wrong way.)
SIDENOTE: My experience was that attempting to increment by anything
in a For loop other than ++i, then QC hangs. I don't understand these
things though…should I file a ticket?
Keith
### Javascript below ###
var _Vertices = [];
var segmentSize = 3;
function (__structure Vertices) main (__number numberOfSegments) {
var result = new Object();
var pos=0;
if (numberOfSegments != null) {
var v=0;
_Vertices.length=0;
var leapDistance=6.2831853/numberOfSegments;
var currentPos=0;
for (var i=0; i <= numberOfSegments;++i){
currentPos=currentPos+leapDistance;
_Vertices[v++] = [0.5*(Math.sin(currentPos)),
0.5*(Math.cos(currentPos)), 0.0 ];
_Vertices[v++] = [0.0, 0.0, 0.0 ];
_Vertices[v++] = [0.5*(Math.sin(currentPos
+leapDistance)), (0.5* Math.cos(currentPos+leapDistance)), 0.0 ];
}
}
result.Vertices = _Vertices
return result;
}
On Wed, Nov 24, 2010 at 1:47 PM, Keith Lang <[email protected]> wrote:
> Appreciate your expert help on this…
>
> I'm no coder, and as an exercise in learning Javascript, I tried to
> help Adam by writing a patch to take in a variable for the number of
> sides, and to output a structure to create a mesh from.
>
> The Javascript is a terribly hacked version of the Mouse Ribbon.qtz
> Apple example. (disclaimer: I can't code)
>
> var _Vertices = [];
> var segmentSize = 3;
>
> function (__structure Vertices) main (__number numberOfSegments) {
> var result = new Object();
> var v=0;
> if (numberOfSegments != null) {
> var arcLength =(360/60);
> for (var i=0; i < 360;60){
> var pos = i/60;
> _Vertices[v++] = [Math.sin(i), Math.cos(i),
> 0.0 ]; }
> }
>
> return result;
> }
>
>
> Problem is, if I paste this in a (unconnected) Javascript patch,
> Quartz Composer becomes unresponsive, requires me to Force Quit.
>
>
> Is this normal?
>
>
> ie, that some poorly written Javascript can make QC require a force
> quit (losing work). Or is my install acting weird?
>
>
>
> Keith
>
>
>
> ########
>
> On Wed, Nov 24, 2010 at 5:25 AM, adam morten <[email protected]> wrote:
>> I would like to create a circle which reacts to audio input. I want the
>> circle to change colour with frequency and change size with volume. I have
>> done this but the part which I am struggling with is that when the frequency
>> changes I want the circle to change through a series of shapes in this
>> order; circle, octagon, heptagon, hexagon, pentagon, square, triangle. So
>> when the frequency is highest it will be a triangle.
>>
>> Thank you in advance,
>> Adam _______________________________________________
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polygon_mesh_variable_sides.qtz
Description: application/quartzcomposer
_______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
