topic Re: looping and rotating a curve around axis from an angles list in Revit API Forum

looping and rotating a curve around axis from an angles list

REDO10 — Tue, 16 May 2023 19:54:08 GMT

Hi all,

I'm writing a python script inside dynamo and I want to rotate a curve from a defined angles list, and I'm stuck on how to set the rotation function, please check below a part of my code :

# curve to rotate curv = IN[0][0].ToRevitType() # circle defining path rotation out_path = IN[0][1].ToRevitType() spacing = IN[1]/0.3048 # computing rotation angle def rebar_rotation(circle, space): sweepAngle = (space * 360) / (circle.Radius * 2 * math.pi) return sweepAngle angle = rebar_rotation(out_path, spacing) # angle count around 360° count = int(math.ceil(360/angle)) for i in range(0, count): a= i*angle # I'm stuck to define the rotation function rebar_curve = curv.Rotate(Line.CreateBound(XYZ(0,0,0), XYZ(0,0,1)), a)

Thanks for your help in advance

Re: looping and rotating a curve around axis from an angles list

Mohamed_Arshad — Thu, 18 May 2023 11:42:35 GMT

HI @REDO10
You need to do circular pattern right ? 158 lines needed?

Re: looping and rotating a curve around axis from an angles list

REDO10 — Thu, 18 May 2023 20:29:32 GMT

@Mohamed_Arshad @Organon

You need to do circular pattern right ? 158 lines needed?

yes that exactly what I need

Thanks

Re: looping and rotating a curve around axis from an angles list

Mohamed_Arshad — Fri, 19 May 2023 17:07:48 GMT

HI @REDO10
You have to use some geometry concepts to solve this, you can use two geometry concepts

01. Rotation Transformation

02. Trignometry Functions
Kindly refer to the below code and a reference image for an Idea.

Rotation Transformation Sample Code:

#region Rotate Curve To 158 Times Line line = verticalLine; XYZ centerPoint = arc.Center; double angleinDeg = 360d / 158d; using (Transaction createArray = new Transaction(revitDoc, "Create Array")) { createArray.Start(); for (int i = 1; i <= 158; i++) { double angleinRad = (angleinDeg * Math.PI) / 180; Transform rotationTransform = Transform.CreateRotationAtPoint(XYZ.BasisZ, angleinRad, centerPoint); Curve c = line.CreateTransformed(rotationTransform); //Create Sketch Plane XYZ normal = XYZ.BasisX.CrossProduct(line.Direction); Plane p = Plane.CreateByNormalAndOrigin(normal, c.GetEndPoint(0)); SketchPlane skp = SketchPlane.Create(revitDoc, p); revitDoc.Create.NewModelCurve(c, skp); angleinDeg +=360d/158d; } createArray.Commit(); } #endregion

Kindly understand the logic behind the code and try to apply it in your Program using Python. Above program will create a Model Line array in the circular form.

Reference Image (Rotation Transformation):

Trigonometry Function Concept:
https://www.mathsisfun.com/geometry/unit-circle.html#:~:text=Try%C2%A0It%C2%A0Yourself,negative%20values%20also.

Hope this will helps 🙂

Re: looping and rotating a curve around axis from an angles list

REDO10 — Fri, 19 May 2023 18:25:32 GMT

@Mohamed_Arshad

Thanks for your solution...I know there are plenty thought solutions!!

I never worked with C#, I'm using Python and I solved my issue by correcting the error I made in my initial script, where I used CreateRotation Method (sometimes a stupid mistake costs you all day!!)

here my corrected code:

import sys import clr import math import System from System.Collections.Generic import IList, List clr.AddReference('RevitAPI') import Autodesk from Autodesk.Revit.DB import * from Autodesk.Revit.DB.Structure import * clr.AddReference('RevitNodes') import Revit clr.ImportExtensions(Revit.GeometryConversion) clr.AddReference('RevitServices') import RevitServices from RevitServices.Persistence import DocumentManager from RevitServices.Transactions import TransactionManager doc = DocumentManager.Instance.CurrentDBDocument curv = IN[0][0].ToRevitType() out_path = IN[0][1].ToRevitType() cover = IN[1]/0.3048 rebar_type = UnwrapElement(IN[2]) Hook_type = UnwrapElement(IN[3]) host= UnwrapElement(IN[4]) spacing = IN[5]/0.3048 # compute the angle rotation def rebar_rotation(circle, space): sweepAngle = (space * 360) / (circle.Radius * 2 * math.pi) return sweepAngle angle = rebar_rotation(out_path, spacing) # rotated rebars count count = int(math.ceil(360/angle)) rebars = [] for i in range(0, count): a= i*angle rot = Transform.CreateRotation(XYZ.BasisZ, a*2*math.pi/360) rot_curve = curv.CreateTransformed(rot) rebars.append(rot_curve.ToProtoType()) OUT = rebars

Thanks again.