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custom charge magnitude

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also: s/charge/particle
to reduce confusion
This commit is contained in:
root 2025-04-27 08:03:07 +00:00
parent 5e04ad107f
commit 642d1c5cdd
3 changed files with 54 additions and 48 deletions
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34
thomson-problem.js
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@ -1,14 +1,18 @@
function move_charges(charges, force_constant) {
for (let charge of charges) {
charge.acceleration.setMag(0);
function move_particles(particles, force_constant) {
for (let particle of particles) {
particle.acceleration.setMag(0);
}
for (let i = 0; i < charges.length; i += 1) {
for (let i = 0; i < particles.length; i += 1) {
for (let j = 0; j < i; j += 1) {
const displacement = p5.Vector.sub(
charges[i].position,
charges[j].position,
particles[i].position,
particles[j].position,
);
const force_mag = (
particles[i].charge * particles[j].charge
/ displacement.magSq()
* force_constant
);
const force_mag = 1 / displacement.magSq() * force_constant;
// XXX possible extension: divide by charge's mass
const ai_mag = force_mag;
const aj_mag = force_mag;
@ -23,16 +27,16 @@ function move_charges(charges, force_constant) {
}
ai.mult(ai_mag);
aj.mult(aj_mag);
project_onto_plane(ai, charges[i].position);
project_onto_plane(aj, charges[j].position);
charges[i].acceleration.add(ai);
charges[j].acceleration.add(aj);
project_onto_plane(ai, particles[i].position);
project_onto_plane(aj, particles[j].position);
particles[i].acceleration.add(ai);
particles[j].acceleration.add(aj);
}
}
for (let charge of charges) {
charge.velocity = charge.velocity.add(charge.acceleration);
charge.position = charge.position.add(charge.velocity);
charge.position.normalize();
for (let particle of particles) {
particle.velocity = particle.velocity.add(particle.acceleration);
particle.position = particle.position.add(particle.velocity);
particle.position.normalize();
}
}