function confineInContainer(position, width, height, api) {
	        var viewWidth = api.getWidth();
	        var viewHeight = api.getHeight();
	        position[0] = Math.min(position[0] + width, viewWidth) - width;
	        position[1] = Math.min(position[1] + height, viewHeight) - height;
	        position[0] = Math.max(position[0], 0);
	        position[1] = Math.max(position[1], 0);
	    }
@file  Define the themeRiver view's series model
@author Deqing Li(annong035@gmail.com)