c# question .

private void RunScript(List<Curve> na, double lendist, ref object A, ref object B)
{
    List<double[]> list1 = new List<double[]>();
    List<Point3d[]> list2 = new List<Point3d[]>();
    for (int i = 0 ;(i <= (na.Count) - 1 ); i++)
    {
      list1.Add(na[i].DivideByLength(lendist, true,                     ???                ));
    }
    A = list1;
    B = list2;
}

Hello, someone can tell me how to use the third param "out" of the methode DivideByLength() ,it will help me a lot ^^

Replies to This Discussion

Permalink Reply by David Rutten on October 11, 2010 at 11:31am

Point3d[] pts = null;

crv.DivideByLength(1.0, true, out pts);

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Giulio Piacentino on October 11, 2010 at 11:39am

Here some changes to your code. You could still add some error checks (for example, that the distance is not 0, etc...). You need to work with trees for Grasshopper to understand the data types.

DataTree<double> tree1 = new DataTree<double>();

DataTree<Point3d> tree2 = new DataTree<Point3d>();



for(int i = 0; i < na.Count; i++)

{

  GH_Path p = new GH_Path(i);



  Point3d[] pts;

  tree1.AddRange(na[i].DivideByLength(lendist, true, out pts), p);

  tree2.AddRange(pts, p);

}

A = tree1;

B = tree2;

Permalink Reply by robert cervellione on October 11, 2010 at 11:46am

out means that is require a variable for the function to pass the results to, in your case you are dividing a curve so it want a temporary place holder for the points you are adding

List list1 = new List();
List list2 = new List();

Point3d[] tempPoints;

for (int i = 0 ; i < na.Count; i++)
{
list1.Add(na[i].DivideByLength(lendist, true, out tempPoints));
list2.Add(tempPoints);
}
A = list1;
B = list2;

but you have a bigger problem, you are trying to return a list of lists. the grasshopper script component cannot do this. you need to use trees!

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Permalink Reply by robert cervellione on October 11, 2010 at 11:52am

a simple solution is change your inputs to be a single curve not a list and graft the list of curves before you pass them to the component and it will work like this

private void RunScript(Curve na, double lendist, ref object A, ref object B)
{
List list1 = new List();
List list2 = new List();
Point3d[] tempPoints;

A = na.DivideByLength(lendist, true, out tempPoints);
B = tempPoints;
}

Permalink Reply by Julz on October 11, 2010 at 12:25pm