how to simulate flow of particles in a wire?

[lookang]

how to simulate flow of particles in a wire?

i analyze the method used here
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=912.0

say for the loop wire
 

Code:

if(x2[j] else if(x2[j]>a-D*i)x2[j]-=D;

is used to trick the human eyes by telling when to disappear n appear a distance + or -D away.

i actually ran into some bug.
the codes works when the variables "lengthx" is 1.5 which is the same as your "D". perfect synchronization, the particles disappear n appear together of the visual effect of particle flow is achieved.

but when i create a slider, and move it,
the particles, dynamically re position but the spacing is funny, not equal.

the resultant new effect is not realistic enough to "trick" to human eye.

any tips for me to explore? my source is attached

Embed a running copy of this simulation
<applet code='users.sgeducation.lookang.ACgenerator02_pkg.ACgenerator02Applet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/14019/ejs_ACgenerator02.jar' name='ACgenerator025002' id='ACgenerator025002' width='878' height='555' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=5002' target='smfejs'>Run simulation</a>

Full screen applet or Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

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[lookang]

not to worry!
i fixed it!

i changed the initialization page to

Code:

for(int i=0;i y1[i]=-lengthz/2+lengthz/n*i; // AD
 y3[i]=lengthz/2-lengthz/n*i; // BC
 x2[i]=a-lengthx/n*i; //AB
 x4[i]=a-lengthx/n*i; // DC
}

which then when the slider is moved
action
added
"

Code:

_initialize();
setparam ();

no problem now!!! cool!

really learnt a lot of (problem solving skills & critical thinking) from analyzing, making sense, remixing the virtual lab to suit my design ideas of how to finer customized the virtual lab.
fantastic pedagogy for learning problem solving skills & critical thinking

my physics knowledge comes alive in the java applet. cool way to assess my learning by portfolio like what prof wolfgang is doing i think.

[Fu-Kwun Hwang]

Great! You are making it better and better.