SampleCreateIfcGrid

Overview

This programming manual in C# offers a practical demonstration of how to create an instance of the IfcGrid class within a model.

Sample code

For example:

var app = new Beaver.BcadApplication();
var doc = app.ActiveDocument;
if (doc == null)
    doc = app.Documents.Add();
var stp = doc.STEPDocument;
var IfcSite  = stp.Instnaces.FindInstance(-1);
var IfcGrid = stp.Instnaces.CreateInstance("IfcGrid"); {
	var IfcLocalPlacement = AddInstance("IfcLocalPlacement"); {
		var ObjectPlacement = IfcSite.Attributes.AttributeAsInst("ObjectPlacement");
		IfcLocalPlacement.Attributes.AttributeAsInst("PlacementRelTo").Value = ObjectPlacement.Value;
		var IfcAxis2Placement3D = stp.Instnaces.CreateInstance("IfcAxis2Placement3D");{
			var Location = stp.Instnaces.CreateInstance("IfcCartesianPoint");{
				double []values={0,0,0};
				Location.Attributes.AttributeAsAggregate("Coordinates").values = values;
			}
			var Axis = stp.Instnaces.CreateInstance("IfcDirection");{
				double []values={0.0, 0.0, 1.0};
				Axis.Attributes.AttributeAsAggregate("DirectionRatios").values = values;
			}
			var Refdirection = stp.Instnaces.CreateInstance("IfcDirection");{
				double []values={1.0, 0.0, 0.0};
				Refdirection.Attributes.AttributeAsAggregate("DirectionRatios").values = values;
			}
			IfcAxis2Placement3D.Attributes.AttributeAsInst("Location").Value = Location;
			IfcAxis2Placement3D.Attributes.AttributeAsInst("Axis").Value = Axis;
			IfcAxis2Placement3D.Attributes.AttributeAsInst("RefDirection").Value = Refdirection;
		}
		IfcLocalPlacement.Attributes.AttributeAsSelect("RelativePlacement").SetValueAsInst(IfcAxis2Placement3D);
	}
	List<double> UAxes = new List<double>();
	UAxes.Add(0.0);
	UAxes.Add(5000.0);
	UAxes.Add(10000.0);
	UAxes.Add(15000.0);
	UAxes.Add(20000.0);
	UAxes.Add(25000.0);
	UAxes.Add(30000.0);
	List<double> VAxes = new List<double>();
	VAxes.Add(0.0);
	VAxes.Add(5000.0);
	VAxes.Add(10000.0);
	VAxes.Add(15000.0);
	VAxes.Add(20000.0);
	VAxes.Add(25000.0);
	VAxes.Add(30000.0);
	var uAxes = new List<STEPInstance>(); {
		double minV = double.MaxValue; double maxV = -double.MaxValue; {
			foreach (var vAxis in VAxes) {
				if (minV > vAxis) 
					minV = vAxis;
				if (maxV < vAxis) 
					maxV = vAxis;
			}		
			minV -= 1000;
			maxV += 1000;
		}
		char tag = 'A';
		foreach (var uAxis in UAxes) {
			var IfcGridAxis = stp.Instnaces.CreateInstance("IfcGridAxis"); {
				var IfcPolyline = stp.Instnaces.CreateInstance("IfcPolyline"); {
					var start = AddInstance("IfcCartesianPoint"); { 
						double []values={uAxis, minV};
						start.Attributes.AttributeAsAggregate("coordinates").values = values;
					}
					var end = AddInstance("IfcCartesianPoint"); { 
						double []values={uAxis, maxV};
						end.Attributes.AttributeAsAggregate("coordinates").values = values;
					}
					STEPInstance []Points={start, end};
					IfcPolyline.Attributes.AttributeAsAggregate("Points").values = Points;
				}
				IfcGridAxis.Attributes.AttributeAsStr("AxisTag").Value = (tag++).ToString();
				IfcGridAxis.Attributes.AttributeAsBool("SameSense").Value = true;
				IfcGridAxis.Attributes.AttributeAsInst("AxisCurve").Value = IfcPolyline;
			}
			uAxes.Add(IfcGridAxis);
		}
	}
	var vAxes = new List<STEPInstance>(); {
		double minU = double.MaxValue; double maxU = -double.MaxValue; {
			foreach (var vAxis in VAxes) {
				if (minU > vAxis) 
					minU = vAxis;
				if (maxU < vAxis) 
					maxU = vAxis;
			}		
			minU -= 1000;
			maxU += 1000;
		}
		int tag = 1;
		foreach (var vAxis in VAxes) {
			var IfcGridAxis = stp.Instnaces.CreateInstance("IfcGridAxis"); {
				var IfcPolyline = stp.Instnaces.CreateInstance("IfcPolyline"); {
					var start = AddInstance("IfcCartesianPoint"); { 
						double []values={minU, vAxis};
						start.Attributes.AttributeAsAggregate("coordinates").values = values;
					}
					var end = AddInstance("IfcCartesianPoint"); { 
						double []values={maxU, vAxis};
						end.Attributes.AttributeAsAggregate("coordinates").values = values;
					}
					STEPInstance []Points={start, end};
					IfcPolyline.Attributes.AttributeAsAggregate("Points").values = Points;
				}
				IfcGridAxis.Attributes.AttributeAsStr("AxisTag").Value = (tag++).ToString();
				IfcGridAxis.Attributes.AttributeAsBool("SameSense").Value = true;
				IfcGridAxis.Attributes.AttributeAsInst("AxisCurve").Value = IfcPolyline;
			}
			vAxes.Add(IfcGridAxis);
		}
	}
	IfcGrid.Attributes.AttributeAsInst("Ownerhistory").Value  = stp.Instnaces.FindInstance(-1);
	IfcGrid.Attributes.AttributeAsStr("Name").Value = "New Grid";
	IfcGrid.Attributes.AttributeAsInst("Ownerhistory").Value  = stp.Instnaces.FindInstance(-1);
	IfcGrid.Attributes.AttributeAsAggregate("UAxes").values = uAxes.ToArray();
	IfcGrid.Attributes.AttributeAsAggregate("VAxes").values = vAxes.ToArray();
}