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Repeller.pde
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Repeller.pde
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// Particles + Forces
// Daniel Shiffman <http://www.shiffman.net>
// A very basic Repeller class
class Repeller {
// Gravitational Constant
float G = 100;
// Location
PVector location;
float r = 10;
float xoff = 0;
Repeller(float x, float y) {
location = new PVector(x,y);
}
void display() {
xoff = xoff + 0.01;
stroke(0);
fill(5);
ellipse(location.x+100*noise(xoff),location.y+100*noise(xoff),10,10);
}
// Calculate a force to push particle away from repeller
PVector repel(Particle p) {
PVector dir = PVector.sub(location,p.location); // Calculate direction of force
float d = dir.mag(); // Distance between objects
dir.normalize(); // Normalize vector (distance doesn't matter here, we just want this vector for direction)
d = constrain(d,5,500); // Keep distance within a reasonable range
float force = -1 * G / (d * d); // Repelling force is inversely proportional to distance
dir.mult(force); // Get force vector --> magnitude * direction
return dir;
}
}