function createGridClipShape(rect, seriesModel, cb) {
	        var rectEl = new graphic.Rect({
	            shape: {
	                x: rect.x - 10,
	                y: rect.y - 10,
	                width: 0,
	                height: rect.height + 20
	            }
	        });
	        graphic.initProps(rectEl, {
	            shape: {
	                width: rect.width + 20,
	                height: rect.height + 20
	            }
	        }, seriesModel, cb);

	        return rectEl;
	    }
Resolve the collision of initialized depth (y-position)

@param {Array.<Array.<module:echarts/data/Graph~Node>>} nodesByBreadth
    group by the array of all sankey nodes based on the nodes x-position.
@param {number} nodeGap  the vertical distance between two nodes
@param {number} height  the whole height of the area to draw the view