public static IfcAreaMeasure Area(this IfcPolyLoop loop, IfcDirection normal)
{
IfcCartesianPoint sum = new IfcCartesianPoint(0, 0, 0);
IList<IfcCartesianPoint> pts = loop.Polygon;
for (int i = 0; i < pts.Count - 1; i++)
{
sum.Add(pts[i].CrossProduct(pts[i + 1]));
}
IfcDirection n = normal.Normalise();
return n.DotProduct(sum)/2;
}
public static IfcAreaMeasure Area(this IfcPolyLoop loop, IfcDirection normal)
{
IfcCartesianPoint sum = new IfcCartesianPoint(0, 0, 0);
IList <IfcCartesianPoint> pts = loop.Polygon;
for (int i = 0; i < pts.Count - 1; i++)
{
sum.Add(pts[i].CrossProduct(pts[i + 1]));
}
IfcDirection n = normal.Normalise();
return(n.DotProduct(sum) / 2);
}
public static IfcAreaMeasure Area(this IfcPolyLoop loop, IfcDirection normal)
{
var sum = new XbimPoint3D(0, 0, 0);
var pts = loop.Polygon;
for (var i = 0; i < pts.Count - 1; i++)
{
sum = XbimPoint3D.Add(sum, pts[i].CrossProduct(pts[i + 1]));
}
var n = normal.Normalise();
return(n.DotProduct(new XbimVector3D(sum.X, sum.Y, sum.Z)) / 2);
}
/// <summary>
/// Sets new directions of the axes. Direction vectors are automaticaly normalized.
/// </summary>
/// <param name = "axis3"></param>
/// <param name = "xAxisDirectionX"></param>
/// <param name = "xAxisDirectionY"></param>
/// <param name = "xAxisDirectionZ"></param>
/// <param name = "zAxisDirectionX"></param>
/// <param name = "zAxisDirectionY"></param>
/// <param name = "zAxisDirectionZ"></param>
public static void SetNewDirectionOf_XZ(this IfcAxis2Placement3D axis3, double xAxisDirectionX,
double xAxisDirectionY, double xAxisDirectionZ, double zAxisDirectionX,
double zAxisDirectionY, double zAxisDirectionZ)
{
IModel model = axis3.Model;
IfcDirection zDirection = model.Instances.New <IfcDirection>();
zDirection.DirectionRatios[0] = zAxisDirectionX;
zDirection.DirectionRatios[1] = zAxisDirectionY;
zDirection.DirectionRatios[2] = zAxisDirectionZ;
zDirection.Normalise();
axis3.Axis = zDirection;
IfcDirection xDirection = model.Instances.New <IfcDirection>();
xDirection.DirectionRatios[0] = xAxisDirectionX;
xDirection.DirectionRatios[1] = xAxisDirectionY;
xDirection.DirectionRatios[2] = xAxisDirectionZ;
xDirection.Normalise();
axis3.RefDirection = xDirection;
}