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  Best choice for making a Graph Layout like this  (Read 1598 times)
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Offline Javalescu

Junior Newbie





« Posted 2011-03-03 17:57:50 »

I've found this nice graph layout made using Python link ! and i'm thinking of making something similar, but using the language i already know ( Java ).

What 2D engine do you think is appropriate for this ?
Any other suggestion is welcome.
Offline pjt33
« Reply #1 - Posted 2011-03-03 18:07:14 »

For drawing circles and lines, any 2D toolkit should be more than sufficient.
Offline Javalescu

Junior Newbie





« Reply #2 - Posted 2011-03-07 15:53:25 »

I've done it, except for the physics part.

I need to make the edges to act like springs; and all nodes to move along a certain direction if a node is dragged.
In a word, realistic movement of the nodes and edges.

Any suggestion for a tutorial or book where i could find the knowledge to realise this ?
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Offline pjt33
« Reply #3 - Posted 2011-03-07 15:59:19 »

http://en.wikipedia.org/wiki/Verlet_integration#Constraints

Force the selected node's position and the rest follows.
Offline xinaesthetic

Senior Member


Medals: 1



« Reply #4 - Posted 2011-03-07 19:01:12 »

As well as springs for edges you might consider using a force to gently repel all nodes from each other (I have some stuff that is similar, unfortunately not in the form of an open source library that I can point you to just now).

EDIT: also, you might look at http://gephi.org
Offline Javalescu

Junior Newbie





« Reply #5 - Posted 2011-04-23 13:31:48 »

I've resumed the work on this project.

I've done some basic 1 D integration, but i can't wrap my head around things and apply it to my graph layout.
So, consider the picture below:

- if i drag the red node to the right, i'm forcing his position to my mouse position
- the other nodes will "follow" him, but how ?

For Verlet, to compute the newPosition, i need the acceleration for every node and the currentPosition.
That is what i don't understand.

How to i compute the acceleration and the currentPosition ?

The currentPosition will be the position of the RedNode ? If yes, doesn't that means that they will all overlap ?




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