Network Nodes

Hi there,

Here is a good question, hopefully someone can help me. I have a lot of network nodes connected to each other (rails). Not all of these connections are straight lines. Some of them have been changed into curves by using Spline Points. Now what I do is show the name(number) of this connection by using a "drawtext" command in the OnDrawTrigger. This does work well but I want to be able to place this text right in the middle of the connection. For the straight lines this is not a problem of course. But in the case of a curve it gets a bit harder.

So my question is; how can I determine/calculate the positions of points on the curve? For instance to get the halfway point or to get the y position based on a fixed x position.

Thank you in advance.

Regards,

Rachid Kolfin

It turns out that there are pretty simple commands that can help you achieve this. If you first define the spline (treenode point = getnetnodespline(NetworkNode, number edge)) then you use the command spline(point, 0.5) to refer to middle point of the curve.

In this case splinex(), spliney() and splinez() will return the middle of the curve compared to the Network Node in which they are.

Perhaps there are more people who also did not know this, so maybe this can be helpfull to you.


Rachid Kolfin

Hi Rachid Kolfin

We are developing a Rail Line simulation and on reading your post above, it would be great if you could help us in building our model. Basically We are developing the Rail Line right now, and we have got Flexsim to show the different stations on our rail line which are represented by Network Nodes. We are confused on the code on how to connect each node to the other. Basically, i am reading a global table as below.

Station X coord Y coord No: of tracks Predecessor
NN1 23 45 1 NN2
NN2 36 39 2 NN3, NN4
NN3 78 96 2 NN5, NN6

and so on........

Could you please help us in the code for connecting our Network Nodes..........

Thanks in advance...

Same Q/A as here

Hello

Thanks for that, we could get 2 stations NN1 and NN2 connected. This is the code we used.

treenode fromobj = rank(model(),4);
treenode toobj = rank(model(),3);
contextdragconnection(fromobj, toobj , "A");

We are basically reading from a global table, and we have 10,000 + stations. We would like to know how do we change the code in such away that each station is connected to its predecessor by reading the values from the global table...

This is the format we use in our global table.

Station Name X Coord Y Coord Z Coord Connected To
NN1 1 1 0 NN2
NN2 4 5 0 NN3

This is the code we use to read from the global table.

treenode nnobj = node("/NetworkNode", library());
treenode tnode;

for(int row =1; row<=gettablerows("Nodes");row++)

{
tnode = createinstance(nnobj, model());
setname(tnode, gettablestr("Nodes", row, 1));
setloc(tnode, gettablenum("Nodes", row, 2), gettablenum("Nodes", row, 3), gettablenum("Nodes", row, 4));

We would like to know how to edit this code so that we would be able to connect NN1 to NN2 and NN2 to NN3.

Thanks ..

Hello Nischith,

One way you could do this is loop through the table twice: first time create all the nodes from the first column, second time create all the connections. This way you are sure that all the nodes exist when making the connections.

you can use the following code to connect the nodes:
treenode fromobj = node( concat( "/", gettablestr( "Nodes", row, 1 ) ), model() );
treenode toobj = node( concat( "/", gettablestr( "Nodes", row, 4 ) ), model() );
if( objectexists( fromobj ) && objectexists( toobj ) )
{
contextdragconnection(fromobj, toobj , "A");
}


Esther

Hello

Things are going good, and we are able to read and display the different stations and they all are connected the way we want them. Different tracks have different speed limits, and we would like to read from the database the max speed at which the train can pass through but how do we assign an attribute to a link joining two network nodes saying thats the max speed for that link.

Thanks for the help.

You need to do it in both directions on the output connections of the network nodes as the link is bidirectional by default.

settablenum(connectionsout(<netnode>),<edgenum>,PORT_SPEED,<edgemaxspeed>)

Hi

We are moving on to the transporter logic, and we have a few aspects which we would like to put into a transporter.

1. How do we access values in the tree structure through code. Basically we would be reading the mean speed of a transporter from a database, and it varies between different transporters. So we would like Flexsim to read from a database and assign the maxspeed and acceleration values in the tree structure.

2. We would also like to show a track being unavailable at a particular instant of time, and hence no transporter is allowed to pass through that track, so they will either have to slow down or stop. Any ideas how we could implement this in code in flexsim ??
Actually there wont be any transporter using that track, but still that track wont be usable at a particular time, and hence we are planning to use the setstate() command to make the train idle or busy.......

Thanks

1) setvarnum(<traveler>,"maxspeed",<dbspeedvalue>)

2) closenodeedge(<netnode>,<edgenum>) - again this is one direction only.

@Jason,

how can I find out "edgenum"?

I think it´s the rank in the Output Ports!? :-(

Yes that's right - the output port number is the edge number

Originally Posted by Jason Lightfoot

1) setvarnum(<traveler>,"maxspeed",<dbspeedvalue>)

2) closenodeedge(<netnode>,<edgenum>) - again this is one direction only.

Could you just give a brief idea what is <netnode>,<edgenum>

Hi

Could you please help me in accessing the tree structure.
I basically am reading values from a table, and as time ticks by, the type of a connection out should change..
I have written my code as follows, but there is some error, and i am not able to reach the "type"
Please see the attached screen shot of my tree structure, and if you could please help me in my code.
My code so far is as follows.

for(int row=1; row<=gettablerows("Bondi Junction UP"); row++)
{
int track1 = 1;
{
int j = (track1-1)*2+2;
//pt("j = "); pf(j);
//pr;
if (gettablenum("Bondi Junction UP", row, j)==0)
{
setnodenum(node("/Bondi Junction>connections/connectionsout/To EdgeCliff/type",model()),1);
pt("type = "); pf();pr();
}

else
{
setnodenum(node("/Bondi Junction>connections/connectionsout/To EdgeCliff/type",model()),2);
}
}
}


for(int row=1; row<=gettablerows("Bondi Junction UP"); row++)
{
int track2 = 2;
{
int j = (track2-1)*2+2;
//pt("j = "); pf(j);
//pr;
if (gettablenum("Bondi Junction UP", row, j)==0)
{
setnodenum(node("/Bondi Junction>connections/connectionsout/To EdgeCliff/type",model()),1);
}
else
{
setnodenum(node("/Bondi Junction>connections/connectionsout/To EdgeCliff/type",model()),2);
}
}
}


I am putting this code as a user event which repeats every tick, and i would like the NN to pass and not pass the transporter accordingly. I did try this as a user event but it did not show the network nodes getiing blocked and unblocked.
Please help...