管网图层
    
    
    
    
    
    
        
| Name | Type | Description | 
|---|---|---|
| ys | Object | YouScene对象 | 
Example:
//定义PipeLinePrimitiveMethods
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    添加管网,添加大面积管网时,可以传pipeLineFeature数组,通过数组加载的会优化性能,但是删除时删一个会全部删除。Name Type Description pipeLineFeaturesPipeLineFeature | Array.<PipeLineFeature> 管网子类 
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    销毁实例
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    getById(id) → PipeLineFeature
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    根据id查找pipeLineFeatureName Type Description idString pipeLineFeature的id Returns:返回查找到的pipeLineFeature
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    pick(windowPosition) → PipeLineFeature
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    从屏幕坐标发出射线,获取第一个相交的PipeLinePrimitiveName Type Description windowPositionCartesian2 屏幕坐标 Returns:返回PipeLineFeature
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    删除pipeLineFeatureName Type Description pipeLineFeaturePipeLineFeature pipeLineFeature 
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    删除所有pipeLineFeature
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    根据id删除pipeLineFeatureName Type Description idString pipeLineFeature的id 
