subdividing in branches from list of points C#

Replies to This Discussion

Permalink Reply by Giulio Piacentino on November 30, 2010 at 2:50am

Hi Andrea,

this is how you can construct a simple tree in C#.
This example sets (p) paths, with (n) elements in each path.

DataTree<int> tree = new DataTree<int>();

int interim = 0;
for(int i = 0; i < p; i++)
{
  GH_Path path = new GH_Path(i); //creates a first-level path

  for(int j = 0; j < n; j++)
  {
    tree.Add(interim, path); //add current number to path
    interim++;
  }
}

A = tree;

- Giulio
_____________
giulio@mcneel.com
McNeel Europe, Barcelona

Permalink Reply by Andrea Polato on November 30, 2010 at 6:44am

Thank you Giulio.
I'm trying right now your code.

Bye!

Permalink Reply by Andrea Polato on November 30, 2010 at 7:40am

I'm a little depressed with scripting....but I want to get the result in c# scripted component!

This is what I wish to achieve with scripting (it took about 1 minute...)

I don't know how to "graft" the panels to perform the mesh|ray intersection then "cull" the useless points mixing the input lists, one time with list of points to separate in branches, second time with the list of values to separate in branches.

Keep trying...
Bye

Permalink Reply by Giulio Piacentino on November 30, 2010 at 7:57am

It's normal - if there is a component, rewriting it from scratch will take longer.

Grasshopper makes some algorithms easily accessible. If the algorithm is missing or not usable for some reason, then you can write it. Otherwise, maybe just mixing components and scripts is the way to go?

If you need to write everything, then try keeping a slow pace and give it some time. Try breaking the algorithm into smaller and more intuitive steps, until solving them one at the time allows to reach the goal.

Also, use more than one component (also more scripting components) if necessary.

- Giulio
_____________
giulio@mcneel.com
McNeel Europe, Barcelona

Permalink Reply by Andrea Polato on November 30, 2010 at 10:15am

I made it in one script! I'm so happy!
I learned a lot of things from this little part. I can cull data with the "for..." loop and the "if..then" control flow.

Checklist:
find which points are under each panel (intersection operations results); //done
subdivide the list of points in branches (one for each panel); //done
mathematical operation for each branch;
bake panels in the appropriate layer.

Permalink Reply by Giulio Piacentino on November 30, 2010 at 10:52am

Great!

- Giulio
_______________
giulio@mcneel.com
McNeel Europe, Barcelona

Permalink Reply by Andrea Polato on November 30, 2010 at 5:06pm

I have to obtain the mean from a list of value inside a tree. I have all divided in branches from this afternoon, but I cant make the mean of this values for each branch.

This is the code I wrote since few minutes ago:


private void RunScript(DataTree val, ref object A)
{
DataTree meanTree = new DataTree();

for (int i = 0; i < val.BranchCount; i++)
{
GH_Path path = val.Path(i); //path for this index
int elementCount = val.Branch(i).Count; //count of element in this index
List item = val.Branch(path);
int itnum = item.Count; //number of items

for(int j = 0; j < itnum; j++)
{
double itpart = item[j];
int k = 0;

if (double sum <= 0) //problem here trying to define the variable sum
{
double sum = val[path, 0];
}
do
{
double sum = sum + itpart;
k++;
} while (k < itnum);
}

meanTree.Add(i, path);
}
A = meanTree;
}


I have to sum all of the items inside one branch, then divide the sum by the amount of the items in the branch. It seems a really simple task, but when trees comes in play, simple becomes hard.
I made a succefull mean scripted component with a list as input.


private void RunScript(List val, ref object A)
{
int i = 0;
double sum = 0;
do
{
sum = sum + val[i];
i++;
} while(i < val.Count);

double mean = sum / val.Count;

A = mean;
}


I want to keep all in one component.
Bye.

Permalink Reply by Giulio Piacentino on December 1, 2010 at 5:16am

Hi Andrea,

this is a way:private void RunScript(DataTree<double> tree, ref object A)
{
  DataTree<double> results = new DataTree<double>();

  for(int i = 0; i < tree.BranchCount; i++)
  {
    GH_Path path = tree.Path(i);
    List<double> branch = tree.Branch(i);

    double sum = 0.0;

    if(branch != null && branch.Count > 0)
    {
      for(int j = 0; j < branch.Count; j++)
      {
        sum += branch[j];
      }
      sum /= branch.Count;
    }
    results.Add(sum, path);
  }

  A = results;
}

- Giulio
_______________
giulio@mcneel.com
McNeel Europe, Barcelona

Permalink Reply by Andrea Polato on December 1, 2010 at 6:49am

Thanks.
I understood the procedure for working with trees and branch.
I didn't know how to access to every item in each branch. I put the wrong variable in tree.Branch.

Permalink Reply by Andrea Polato on December 4, 2010 at 7:55am

After one week of hard work, I learned a lot of new things about scripting in c#.
I made an optimizing process and I translated all single component in 2 or 3 c# scripted components.
I want to show the before and after definition.
Many thanks to Giulio.
The project is not finished yet.

Bye.

Andrea