绘制图形通用方法：对接Cesium原生特性
                var polygon2 = entityController.appendGraphics(polygon);
                //清除
                pointArr = new Array();
            }
        }

        /*移除绘制图形 */
        function removeEntities() {
            //注销鼠标各项事件
            mouseEventManager.unRegisterMouseEvent('LEFT_CLICK');
            mouseEventManager.unRegisterMouseEvent('MOUSE_MOVE');
            mouseEventManager.unRegisterMouseEvent('RIGHT_