line设置smoothness后，缩放和拖动地图，line变形

[Liquid-Zhangliquan]

maptalks's version and what browser you use?
----0.44.2

Issue description
----当我设置smoothness=0.1时，缩放和拖动地图出现line的轨迹变形的情况；具体操作是当你的line在你视图下方时会重现

Please provide a reproduction URL (on any jsfiddle like site)
----https://codepen.io/liquid-zhangliquan/pen/wLzZVG

[Liquid-Zhangliquan]

正常情况下：
异常：

[fuzhenn]

another reproduction:
https://liquid-zhangliquan.github.io/maptalks-weather-demo/weather_demo/weather_line1.html?tdsourcetag=s_pctim_aiomsg