revit之射線法查找特定元素

我們在開發的過程中，射線法用的也挺多的，比如：想找到所有的樑；想找到離某一元素最近的元素等。今天簡單的簡介一下射線的用法。

射線的發的核心類：ReferenceIntersector

他的內部有2中射線法查找的方法
查找符合條件的所有元素
IList Find(XYZ origin, XYZ direction)
查找符合條件的最近元素
ReferenceWithContext FindNearest(XYZ origin, XYZ direction)

廢話不多說了，直接上代碼。

• 查找符合條件的所有元素

/// <summary>
/// 射線法查找最近的Element
/// </summary>
/// <param name="doc">Dcument</param>
/// <param name="filter">例如：ElementClassFilter filter = new ElementClassFilter(typeof(CableTray))</param>
/// <param name="targetRef">目標對象</param>
/// <param name="center">射源</param>
/// <param name="direction">方向</param>
/// <param name="hitElement">被擊中的Element</param>
/// <returns>返回該射線</returns>
public static Line xRayFindNearest(this Document doc, ElementFilter filter, FindReferenceTarget targetRef, XYZ center, XYZ direction, ref Element hitElement)
{
    FilteredElementCollector collector = new FilteredElementCollector(doc);
    Func<View3D, bool> isNotTemplate = v3 => !(v3.IsTemplate);
    View3D view3D = collector.OfClass(typeof(View3D)).Cast<View3D>().First<View3D>(isNotTemplate);
    ReferenceIntersector refIntersector = new ReferenceIntersector(filter, targetRef, view3D);
    ReferenceWithContext rwc = refIntersector.FindNearest(center, direction);
    if (null == rwc)
    {
        return null;
    }
    Reference reference = rwc.GetReference();
    XYZ intersection = reference.GlobalPoint;
    hitElement = doc.GetElement(reference);
    Line result = null;
    if (!center.IsAlmostEqualTo(intersection))
    {
        result = Line.CreateBound(center, intersection);
    }
    else
    {
        hitElement = null;
    }
    return result;
}

• 查找符合條件的最近元素

/// 射線法查找所有的Element
/// <summary>
/// 射線法查找所有的Element
/// </summary>
/// <param name="doc">Dcument</param>
/// <param name="filter">例如：ElementClassFilter filter = new ElementClassFilter(typeof(CableTray))</param>
/// <param name="targetRef">目標對象</param>
/// <param name="center">射源</param>
/// <param name="direction">方向</param>
/// <returns>返回該射線</returns>
public static IList<Element> xRayFindAll(this Document doc, ElementFilter filter, FindReferenceTarget targetRef, XYZ center, XYZ direction)
{
    FilteredElementCollector collector = new FilteredElementCollector(doc);
    Func<View3D, bool> isNotTemplate = v3 => !(v3.IsTemplate);
    View3D view3D = collector.OfClass(typeof(View3D)).Cast<View3D>().First<View3D>(isNotTemplate);
    ReferenceIntersector refIntersector = new ReferenceIntersector(filter, targetRef, view3D);
    IList<ReferenceWithContext> refWithContexts = refIntersector.Find(center, direction);
    if (null == refWithContexts)
    {
        return null;
    }
    IList<Element> resultElements = new List<Element>();
    foreach (ReferenceWithContext rwc in refWithContexts)
    {
        Reference reference = rwc.GetReference();
        Element hitElement = doc.GetElement(reference);
        if (hitElement != null)
        {
            resultElements.Add(hitElement);
        }
    }
    return resultElements;
}