The base class
linked_node provides functionality to create systems of interconnected turtles.
It is used by two simulations: the string fixed at one end point and the net stretched on a frame. You can
click and move the turtle in both simulations.
Here are some rules of using the base class to create custom nodes:
- Node must be initialized before start. Initialization has to fill the list of connected nodes:
:links, so usually you need to create nodes and initialize
them in the second pass, when all turtles are present in some structure.
At the end of initialization call
initialized :r :px :py
function. It is needed to setup the initial position of the turtle and its radius which is used to calculate
a force between nodes.
fcoeff :d to change the default formula of the force at specified distance.
"fixed := true
to pin the turtle in its position.
- Setup a single timer to run the simulation:
"clock := timer [
Timer interval should be short to keep high precision of step and force calculations, and long enough to let
the turtles make theirs steps.
(signalw "step :dt)
- Setup another timer to repaint the graphics window (and avoid too frequent redraws):
"painter := timer [refresh] 50
- There are also a few parameters like the node mass, gravity force, etc, which are easy to understand from
the code. Have fun!