A simple function very much like the native Polar Grid Tool in AI, only this function actually creates individual cells rather than just some simple circles with lines in them.

center – Location of the grid origo, [point]
inner – The inner radius of the grid, [number]
outer – Radius of the grid, [number]
sectors – Sets the number of sector dividers, [array]
rings – Number of concentric dividers of the grid, [number]

“sectors” is an array carrying the number of sectors / concentric ring. This way, each ring may have a different number of sectors. For an ordinary grid just pass a one value array as “sectors” and make sure “rings” is at the right amount.

function RadialGrid(center, inner, outer, sectors, rings){

	var p1, p2, p3, p4, firstArcMid, secondArcMid,
		angle, angleStep, innerRadius, outerRadius,
		ringRadius = (outer - inner) / rings,
		sector

	for(var i = 0; i < rings; i++){

		sector		= rings > sectors.length ? sectors[sectors.length - 1] : sectors[i]
		angle		= 90
		angleStep	= 360 / sector
		innerRadius	= ringRadius * i + inner
		outerRadius	= ringRadius * (i + 1) + inner

		for(var j = 0; j < sector; j++){
			
			p1				= center - new Point({length: innerRadius, angle: angle})
			p2				= center - new Point({length: outerRadius, angle: angle})
			p3				= center - new Point({length: outerRadius, angle: angle + angleStep})
			p4				= center - new Point({length: innerRadius, angle: angle + angleStep})
			firstArcMid		= center - new Point({length: outerRadius, angle: angle + angleStep / 2})
			secondArcMid	= center - new Point({length: innerRadius, angle: angle + angleStep / 2})

			if(sector == 1){
				Pathfinder.backMinusFront([new Path.Circle(center, outerRadius), new Path.Circle(center, innerRadius)])
			} else {
				var path = new Path([p1, p2])
					path.arcTo(firstArcMid, p3)
					path.add(p4)
					path.arcTo(secondArcMid, p1)
					path.closePath()
			}

			angle += angleStep
		}
	}
}

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