galaa

O originally posted this on the Max/MSP section, but have recieved no replies so I thought I would post it here as well (maybe I originally posted in the wrong place). Apologies if this is bad etiquette on my part or if you've already seen this.

I have been using the patch that Joshua constructed a long time ago for creating a feathered circle (

https://cycling74.com/forums/index.php?t=msg&goto=35273&rid=0&srch=feathered#msg_35273)

 and then I came across this post by Olivia (

https://cycling74.com/forums/index.php?t=msg&goto=36598&rid=0&srch=feathered#msg_36598)

about using one js object to create more than one feathered circle. So i thought I'd give it a go. I followed the thread of the post and made the changes that Joshua suggested in response to Olivia's problems. When I try the patch everything seems to be OK in that I don't get any error messages, but the circles don't draw.

When I attempt to create a circle by clicking the "setcircle" messages the video stops playing for a short period of time whilst the computer has a serious 'think' about things and then resumes with no circles.

I've attempted to go through the javascript file, but my java is a little rusty to say the least - i kind of understand whats going on, but can't see anything wrong with the code (it would have to be pretty obvious for me to spot it!).

Anyway, if anyone is able to help me understand why the circles don't draw I would really appreciate it.

function setcircle(num,x,y,radius,feather)

// This should add each circle to the one behind it, so

// calculate the inner radius from the outer radius and feather

inrad = Math.max(0,rad-rad*feather); //feather as a percentage of radius

// first draw the inner circle, white (all on)

glvertex(x+(inrad*sintab[i]),y+(inrad*costab[i]));

// then draw the outer ring, linearly interpolating from white to black

glvertex(x+(rad*sintab[i]),y+(rad*costab[i]));

// when we receive a jit_matrix message: resize if necessary, draw the image, stuff into the alpha channel, and pass on

if ((imgtmp.size[0]!=mysketch.size[0]) ||

Hi guys,
O originally posted this on the Max/MSP section, but have recieved no replies so I thought I would post it here as well (maybe I originally posted in the wrong place). Apologies if this is bad etiquette on my part or if you've already seen this.

HI all,
I have been using the patch that Joshua constructed a long time ago for creating a feathered circle (https://cycling74.com/forums/index.php?t=msg&goto=35273&rid=0&srch=feathered#msg_35273) and then I came across this post by Olivia (https://cycling74.com/forums/index.php?t=msg&goto=36598&rid=0&srch=feathered#msg_36598)
about using one js object to create more than one feathered circle. So i thought I'd give it a go. I followed the thread of the post and made the changes that Joshua suggested in response to Olivia's problems. When I try the patch everything seems to be OK in that I don't get any error messages, but the circles don't draw.
When I attempt to create a circle by clicking the "setcircle" messages the video stops playing for a short period of time whilst the computer has a serious 'think' about things and then resumes with no circles.
I've attempted to go through the javascript file, but my java is a little rusty to say the least - i kind of understand whats going on, but can't see anything wrong with the code (it would have to be pretty obvious for me to spot it!).
Anyway, if anyone is able to help me understand why the circles don't draw I would really appreciate it.

var img = new Image();
var imgtmp = new Image();
var mysketch = new Sketch(320,240);
var num_circles = 5;
var vx = new Array(num_circles);
var vy = new Array(num_circles);
var vrad = new Array(num_circles);
var vfeather = new Array(num_circles);

const slices = 40;
var sintab = new Array(slices);
var costab = new Array(slices);

var i,iscale;
iscale = 2*Math.PI/(slices-1);
for (i=0;i
sintab[i] = Math.sin(i*iscale);
costab[i] = Math.cos(i*iscale);
}

function setcircle(num,x,y,radius,feather)
{
vx[num]=x;
vy[num]=y;
vrad[num]=Math.max(0,radius);
vfeather[num]=Math.max(0,feather);

function draw()
{
mysketch.setcontext();
var x,y,feather,rad;

with (mysketch) {
glclearcolor(0,0,0,1);
glclear();
// This should add each circle to the one behind it, so
// their transparency adds
glenable("blend");
glblendfunc("one","one");

// loop over each circle
for (j=0;j
// get parameter values for that circle
x=vx[j];
y=vy[j];
feather=vfeather[j];
rad=vrad[j];

// calculate the inner radius from the outer radius and feather
inrad = Math.max(0,rad-rad*feather); //feather as a percentage of radius

// first draw the inner circle, white (all on)
glbegin("tri_strip");
glcolor(1,1,1,1);
for (i=0;i
glvertex(x,y);

glvertex(x+(inrad*sintab[i]),y+(inrad*costab[i]));
}
glend();

// then draw the outer ring, linearly interpolating from white to black
glbegin("tri_strip");
for (i=0;i
glcolor(1,1,1,1);

glvertex(x+(inrad*sintab[i]),y+(inrad*costab[i]));
glcolor(0,0,0,1);

glvertex(x+(rad*sintab[i]),y+(rad*costab[i]));
}
glend();
}
}
}

// when we receive a jit_matrix message: resize if necessary, draw the image, stuff into the alpha channel, and pass on
function jit_matrix(mname)
{
img.fromnamedmatrix(mname);

if ((img.size[0]!=mysketch.size[0]) ||
(img.size[1]!=mysketch.size[1])) {
mysketch.size[0] = image.size[0];
mysketch.size[1] = image.size[1];
}

if ((imgtmp.size[0]!=mysketch.size[0]) ||
(imgtmp.size[1]!=mysketch.size[1])) {
imgtmp = new Image(mysketch);
} else {
imgtmp.copypixels(mysketch);
}
img.copychannel(imgtmp,"red","alpha");
img.tonamedmatrix(mname);
outlet(0,"jit_matrix",mname);
}


javascript-problems

Would it be possible for anyone to test the patch and js file and let me know whether it works for them.

Quote: galaa wrote on Thu, 08 February 2007 10:22

----------------------------------------------------

> Would it be possible for anyone to test the patch and js file and let me know whether it works for them. 

Hi galaa, your post is quite a long story without spacings. Furthermore you didn't mention the filename of your js file and when I figured that out myself and started the patch, max hangs.

Since your patch and js are not just a few objects/lines, it looks like it would take me about an hour to figure out what you want to do and what is wrong. Take into account the amount of money ppl pay me per hour and you'll know how much it would cost me to reply to your post..

Quote: galaa wrote on Thu, 08 February 2007 10:22
----------------------------------------------------
> Would it be possible for anyone to test the patch and js file and let me know whether it works for them. 
>
> Please...
----------------------------------------------------

Hi galaa, your post is quite a long story without spacings. Furthermore you didn't mention the filename of your js file and when I figured that out myself and started the patch, max hangs. 

yeah i know its a bit of large patch and that people are busy, etc... always worth an ask though, hey!

Anyway, I think I've managed to find a work around using a grdient transparent mask so I don't need to use javascript after all (hopefully)

Hi Mattijs
yeah i know its a bit of large patch and that people are busy, etc... always worth an ask though, hey!

javascript problems