function updateHoverAnimation(path, symbolMeta) {
	        path.off('emphasis').off('normal');

	        var scale = symbolMeta.symbolScale.slice();

	        symbolMeta.hoverAnimation && path
	            .on('emphasis', function() {
	                this.animateTo({
	                    scale: [scale[0] * 1.1, scale[1] * 1.1]
	                }, 400, 'elasticOut');
	            })
	            .on('normal', function() {
	                this.animateTo({
	                    scale: scale.slice()
	                }, 400, 'elasticOut');
	            });
	    }
Initialize single coordinate system.

@param  {module:echarts/coord/single/AxisModel} axisModel
@param  {module:echarts/model/Global} ecModel
@param  {module:echarts/ExtensionAPI} api
@private