HI Joshua,

Thanks, I finally got something working.

function draw()
{
var width = box.rect[2] – box.rect[0];
var height = box.rect[3] – box.rect[1];
var aspect = width/height;

with (sketch) {
glclearcolor(myfrgb);// bg (color)
glclear(); // kind of background

glcolor(0,0,0); // FILL COLOR
plane(aspect*0.98,0.90); // "FILL PLANE
}
}

Though I’m a bit lost with those coordinate (+/-aspect & +/-1) and doing a plane by using percentage of the aspect and +/-1 value only work for certain resize (the horizontal and vertical border sometimes is not the same, depending of the sizebox).
So I would prefer to have a value in pixel that is constant for both horizontal and vertical.

Should I plunge into learning "sceentoworkld" and the like ?
Should I use line drawing instad of plane ?

Thanks,

Salvator