centerImage = function (img, size) {
				img.attr({
					width: size[0],
					height: size[1]
				}).translate(
					-mathRound(size[0] / 2),
					-mathRound(size[1] / 2)
				);
			}
Draw a symbol out of pre-defined shape paths from the namespace 'symbol' object.

@param {Object} symbol
@param {Object} x
@param {Object} y
@param {Object} radius
@param {Object} options