Python+DRVT 从外部调用 Revit：批量创建梁(2)

接着昨天的示例，继续创建梁，这次展示以椭圆弧、Nurbs为轴线。

创建以椭圆弧为轴线的梁

椭圆弧曲线的创建：

python 复制代码

# 创建椭圆弧
def CreateEllipse(ctx : MyContext, z: float) -> DB.Curve:
    """
    create a horizontal partial ellipse instance with specified z coordinate value
    """
    session = ctx.session
    center = DB.XYZ.ctor(session, m2feet(15), m2feet(-10), z);
    radX = m2feet(3.0)
    radY = m2feet(5.0)
    xVec = DB.XYZ.ctor(session, 1, 0, 0);
    yVec = DB.XYZ.ctor(session, 0, 1, 0);
    param0 = deg2rad(0)
    param1 = deg2rad(180)
    ellpise = DB.Ellipse.CreateCurve(session, center, radX, radY, xVec, yVec, param0, param1)
    return ellpise

批量创建梁：

与昨天的一样，只需要将curve = CreateAr c(ctx, levelZ) 替换为 curve = CreateEllipse(ctx, levelZ)即可。生成结果：

创建以Nurbs为轴线的梁

Nurbs的创建：

python 复制代码

# 创建Nurbs曲线
def CreateNurbSpline(ctx : MyContext, z: float) -> DB.Curve:
    """
    create a horizontal nurbspline instance with specified z coordinate value
    """
    session = ctx.session

    numPoints = 5;
    outerRadius = 5.0;
    innerRadius = outerRadius * math.cos(math.pi / 10) / math.cos(3 * math.pi / 10)
    startAngleDeg = 90.0;

    weights = Revit.ListDouble.ctor(session)
    # create control points with same z value
    ctrPoints = DB.ListXYZ.ctor(session)
    for i in range(numPoints * 2):
        angleDeg = startAngleDeg - i * 360.0 / (numPoints * 2)
        angleRad = angleDeg * math.pi / 180.0
        if i % 2 == 1:
            radius = outerRadius
        else:
            radius = innerRadius
        x = radius * math.cos(angleRad)
        y = radius * math.sin(angleRad)
        ctrPoints.Add(DB.XYZ.ctor(session, m2feet(x), m2feet(y), z))
        weights.Add(1)

    nurbSpline = DB.NurbSpline.CreateCurve(session, ctrPoints, weights)
    return nurbSpline

批量创建梁：

同样，只需要将curve = CreateAr c(ctx, levelZ) 替换为 curve = CreateNurbSpline (ctx, levelZ)即可（注：不同的Nurbs几何形状/大小会影响FamilySymbol实例的创建，可能会因约束不满足而创建失败。这是正常的与手工创建无异）。生成结果：