/* ------------------			*/
/* index-lanes-tick.js    */
/* ------------------			*/

// ----------------												force field
function tickRollsForce(alpha) {
		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 < nodes.length; i++) {
			if (nodes[i].fx === undefined) nodes[i].vxTmp = nodes[i].vx, nodes[i].fx = nodes[i].x, nodes[i].fxTmp = 'set'
			if (nodes[i].fy === undefined) nodes[i].vyTmp = nodes[i].vy, nodes[i].fy = nodes[i].y, nodes[i].fyTmp = 'set'
		}
	}
	if (moving == 1) {
		for (var i = 0; i < nodes.length; i++) {
			if (nodes[i].fxTmp === 'set') nodes[i].vx = nodes[i].vxTmp, nodes[i].fx = undefined, nodes[i].fxTmp = undefined
			if (nodes[i].fyTmp === 'set') nodes[i].vy = nodes[i].vyTmp, nodes[i].fy = undefined, nodes[i].fyTmp = undefined
		}			
		tickingNodes(alpha)
	}			


	function tickingNodes(alpha) {				// 				do when force is active

		for (var i = 0, n = nodes.length, node; i < n; ++i) {
				node = nodes[i];
					if (node.color == 'red')	{				// red
					q = (node.x - c ) / c // -1 | 0 | +1
					node.vx = node.vx - q * p  
					node.x = node.x + node.vx
					node.fy = node.y
						
				}
				if (node.color == 'blue')	{ 			// blue
					q = (node.x - c ) / c // -1 | 0 | +1
					node.vx = node.vx - q * p  
					node.x = node.x + node.vx
					node.fy = node.y
					}
				if (node.color == 'green')	{	 	// green
					q = (node.x - c ) / c // -1 | 0 | +1
					node.vx = node.vx - q * p  
					node.x = node.x + node.vx
					node.fy = node.y
				}
				if (node.color == 'black')	{		// black
					node.fx = node.x
					node.fy = node.y
				}
				if (node.color == 'grey')	{		// grey
					node.fx = node.x
					node.fy = node.y
				}
			}
		}
}			
			
function force3(alpha) {
    node = nodes[2];
   if (node.vx > 0 && node.x >= 500) node.vx = -node.vx
   if (node.vx < 0 && node.x <= 100) node.vx = -node.vx
}