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function Particle(x, y, m, c) {
this.pos = createVector(x, y);
this.vel = createVector(0, 0);
this.acc = createVector(0, 0);
this.colour = c;
this.mass = m;
this.applyForce = function(force) {
this.acc.add(p5.Vector.div(force, this.mass));
}
this.applyDrag = function(drag_coeff) {
var rev_vel = createVector().sub(this.vel);
var drag = rev_vel.mult(drag_coeff);
this.applyForce(drag);
}
this.update = function() {
this.vel.add(this.acc);
this.pos.add(this.vel);
this.acc.mult(0);
if (this.pos.x <= 0 || this.pos.x >= wid)
this.vel.x = -this.vel.x;
if (this.pos.y <= 0)
this.vel.y = -this.vel.y;
}
this.show = function() {
point(this.pos.x, this.pos.y);
}
this.reflect = function(surface_vector, elastic_coeff) {
var normal = surface_vector
.copy()
.normalize()
.rotate(PI/2);
this.vel = this.vel.sub(p5.Vector.mult(normal, 2 * this.vel.dot(normal))).mult(elastic_coeff);
}
this.online = function(x1, y1, x2, y2) {
var dist = function(x1, y1, x2, y2) {
return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
};
return Math.abs(
dist(x1, y1, this.pos.x, this.pos.y) +
dist(this.pos.x, this.pos.y, x2, y2) -
dist(x1, y1, x2, y2)
) < 2;
}
this.collide = function(otherp) {
var dist = function(x1, y1, x2, y2) {
return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
};
return dist(this.pos.x, this.pos.y, otherp.pos.x, otherp.pos.y) < this.mass + otherp.mass;
}
}
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