Fun exercise! Here's one approach:
function addCircles(/*(num|str)=auto*/diameter,/*uint=auto*/count, pg,DX,DY,dm,pp,shft,dx,dy,k,t)
//----------------------------------
// Add masking circles on the active page, that is, [Paper]-filled ovals.
// - diameter [opt] : diameter of each circle, either as a number in default
// measurement unit, or as a val-unit string e.g. "1.5mm" or "28pt". If not
// supplied, some diameter is automatically determined.
// - count [opt] : number of circles. If not supplied, a huge count is taken.
// => undef
{
pg = 'LayoutWindow'==(t=app.properties.activeWindow||0).constructor.name && (t.properties.activePage);
if( !(pg||0).isValid ){ alert("Please, make a page active."); return; };
// [REM] Assumes DX,DY have the same MU.
t = pg.bounds;
DX = t[3]-t[1];
DY = t[2]-t[0];
// Diameter
if( 'string' == typeof diameter && isFinite(t=parseFloat(diameter||'0')) && 0 < t )
{
dm = '?' != UnitValue(diameter).type && diameter;
}
else
{
t = +(diameter||0);
dm = 0 <= t && t < (DX>>>1) && t < (DY>>>1) && t;
}
dm || (dm=Math.min(DX,DY)/10); // Fallback?
// Oval props
pp =
{
transparencySettings:null,
strokeTransparencySettings:null,
fillTransparencySettings:null,
contentTransparencySettings:null,
textWrapPreferences:{textWrapMode:+TextWrapModes.NONE},
contentType:+ContentType.UNASSIGNED,
geometricBounds:[0, 0, dm, dm],
fillColor:'Paper',
fillTint:-1,
strokeWeight:0,
};
// Optimal count?
(count>>>=0) || (t=parseFloat(dm), count=Math.round(DX*DY/(t*t)));
// Create a set of sparse [dx,dy] shifts.
// (Reduces the number of close circles.)
const MR = Math.random;
const SQ = 1.2*Math.sqrt(count); // must be > √count and < 0xFFFE
const CHR = String.fromCharCode;
for( shft={} ; shft.__count__ < count ; shft[k]=[ DX*dx, DY*dy ] )
{
do{ dx=MR(), dy=MR(), k=CHR( 1+(SQ*dx)>>>0, 1+(SQ*dy)>>>0) }
while( shft.hasOwnProperty(k) );
}
// Generate the circles.
with( Window.splash=new Window('palette','',void 0,{borderless:true}) )
{
margins=50;
add('statictext',void 0,"Generating "+count+" circles...");
show();
update();
}
app.scriptPreferences.enableRedraw = false;
for each( t in shft ) pg.ovals.add(pp).move(t);
app.scriptPreferences.enableRedraw = true;
Window.splash.hide();
};
app.doScript
(
"addCircles( '25px', 200 )",
void 0, void 0, +UndoModes.ENTIRE_SCRIPT,
"Add Circles"
);
Best,
Marc
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