red", "blue", "orange", "yellow", "green", "purple", "black"])

	var radIus = 250;

	var canvas = d3.select("body")
					.append("svg")
					.attr("width", 1500)
					.attr("height", 1500);

	var group = canvas.append("g")
					.attr("transform", "translate(250, 250)");

	var arc = d3.svg.arc()
				.innerRadius(0) //keep it some number for arch chart
				.outerRadius(radIus);


	var map_same = function(_data){return _data;}
	var pie = d3.layout.pie()
				.value(map_same);

	var arcs = group.selectAll(".arc"