/* ------------------	*/
/* index-rings-tick.js   		    */
/* ------------------	*/

function tickVoroForce(alpha) {											// ticking force
		hpct = parseInt(svgElement.style("width"), 10) / 100
		vpct = parseInt(svgElement.style("height"), 10) / 100
		mpct = hpct +  vpct / 2
			var dir = 0
			var k = 1
			var p = 0.01
			var c = 50
			var q = 1

	if (moving == 0) {
		for (var i = 0; i < seeds.length; i++) {
			if (seeds[i].fx === undefined) seeds[i].vxTmp = seeds[i].vx, seeds[i].fx = seeds[i].x, seeds[i].fxTmp = 'set'
			if (seeds[i].fy === undefined) seeds[i].vyTmp = seeds[i].vy, seeds[i].fy = seeds[i].y, seeds[i].fyTmp = 'set'
		}
	}
	if (moving == 1) {
		for (var i = 0; i < seeds.length; i++) {
			if (seeds[i].fxTmp === 'set') seeds[i].vx = seeds[i].vxTmp, seeds[i].fx = undefined, seeds[i].fxTmp = undefined
			if (seeds[i].fyTmp === 'set') seeds[i].vy = seeds[i].vyTmp, seeds[i].fy = undefined, seeds[i].fyTmp = undefined
		}			
		tickingSeeds(alpha)
	}			
}

	function tickingSeeds(alpha) {								//	tick when force is active
		for (i = 0; i < seeds.length; i++) {
		
				var randNormal = d3.randomNormal(1.3, 2)
				var randNormal2 = d3.randomNormal(0.5, 1.8)

				seeds[i].vx = randNormal() * (Math.random() - 0.5)
				seeds[i].vy += randNormal2()
		}

		seedsArea = {x0: nodes[0].x, y0: 0, x1:nodes[1].x, y1: 100}
		extent = [[seedsArea.x0 + 1, seedsArea.y0 + 1], [seedsArea.x1 + 1 , seedsArea.y1 - 1]]		// abs
		voro = d3.voronoi().extent(extent)
		dia =  voro(seeds.map(function(d) {return [d.x, d.y]}))		// pass an array of coordinates [[,], [,]]
		polygons = dia.triangles()

		redrawVoroDiagam()			// REDRAW DIAGRAM			
	}

	function contentionForce(alpha, items, area) {			// contentionForce
		for (var i = 0, n = items.length, node, k = alpha * 0.1; i < n; ++i) {
			var item = items[i]
			if (item.vx > 0 && item.x >= area.x1) item.vx = -item.vx
			if (item.vx< 0 && item.x <= area.x0) item.vx = -item.vx
			
			if (item.vy > 0 && item.y >= area.y1) item.vy = -item.vy
			if (item.vy < 0 && item.y <= area.y0) item.vy = -item.vy
			
			
			if (Math.abs(item.vx) < 0.05) item.vx *= 2
			if (Math.abs(item.vy) < 0.05) item.vy *= 2
			
			if (Math.abs(item.vx) > 0.5) item.vx /= 2
			if (Math.abs(item.vy) > 0.5) item.vy /= 2

		}
	}