Grid extents alignment based on crop region

Revit
4

Hello @dhilipseshan
you need to get the “cut elevation” CutPlane of the view to set elevation of bounds curve (CropBox)

extend grids in view
extend grids in view800×450 1020 KB

an example with the active view

import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument

def createDatumLine(boundLines, grid):
	gridLine = None
	curveG = grid.Curve
	vectGrid = curveG.Direction 
	ptmid = curveG.Evaluate(0.5, True)
	lstPtToLine = []
	for lineBound in boundLines:
		interResult = lineBound.Project(ptmid)
		vectInterResult = Autodesk.Revit.DB.Line.CreateBound( ptmid , interResult.XYZPoint).Direction
		if vectInterResult.IsAlmostEqualTo(vectGrid, 0.1) or vectInterResult.IsAlmostEqualTo(vectGrid.Negate(), 0.1):
			lstPtToLine.append(interResult.XYZPoint)

	if len(lstPtToLine) == 2:
		gridLine = Autodesk.Revit.DB.Line.CreateBound(lstPtToLine[0], lstPtToLine[1])
	return gridLine
					
def getBoundLines(bbx, Zvalue ):
	lstPt = []
	lstLine = []
	lstPt.append(XYZ(bbx.Min.X, bbx.Min.Y, Zvalue))
	lstPt.append(XYZ(bbx.Max.X, bbx.Min.Y, Zvalue))
	lstPt.append(XYZ(bbx.Max.X, bbx.Max.Y, Zvalue))
	lstPt.append(XYZ(bbx.Min.X, bbx.Max.Y, Zvalue))
	for idx, pt in enumerate(lstPt):
		if idx == 0:
			lstLine.append(Line.CreateBound(lstPt[- 1], pt))
		else:	
			lstLine.append(Line.CreateBound(lstPt[idx - 1], pt))			
	return lstLine		

activView = doc.ActiveView
cropBox = activView.CropBox 
viewRange = activView.GetViewRange()
cutOffset = viewRange.GetOffset(PlanViewPlane.CutPlane)

fecGrids = FilteredElementCollector(doc, activView.Id).OfClass(DatumPlane).ToElements()
outLst = []
boundLines = getBoundLines(cropBox, cutOffset)

TransactionManager.Instance.EnsureInTransaction(doc)
for grid in fecGrids:
	newGLine = createDatumLine(boundLines, grid)
	if newGLine:
		grid.SetCurveInView(DatumExtentType.ViewSpecific, activView, newGLine)
		outLst.append(newGLine)
TransactionManager.Instance.TransactionTaskDone()

OUT = outLst
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