Rotating a canvas object around the mouse cursor - html

Question

I am trying to replicate this effect: http://hakim.se/experiments/html5/trail/03/
I have this as a Particle constructor:
function Particle(x, y) {
this.x = x;
this.y = y;
this.radius = 4;
this.color = '#f0f';
this.speed = 15;
this.angle = 0;
}
And I'm using this loop to animate all particle instances:
for (var i = 0, len = particles.length; i < len; i++) {
var dx = mouse.x - particles[i].x,
dy = mouse.y - particles[i].y,
angle = Math.atan2(dy, dx);
particles[i].vx = Math.cos(angle) * particles[i].speed;
particles[i].vy = Math.sin(angle) * particles[i].speed;
particles[i].x += particles[i].vx;
particles[i].y += particles[i].vy;
particles[i].draw(ctx);
}
The particles follow the mouse, but reach the cursor and start flickering around it, which is not a desired behaviour. I'd like to circle around the cursor, as in the example.. The interesting part is that if I set the particle.speed to something like 30 and add 1000 to the angle, the particles rotate around the cursor, but really fast and ruin the effect...
You can see a live example here: http://codepen.io/gbnikolov/pen/EwafI
All suggestions are more then welcome, thanks in advance!
P.S. I know that the code for the pointed example is easily findable, but I'm relatively new to javascript and I'm not that good at reading other people code and can't quite understand the logic behind it..

Answer 1

Currently the target of your particles is the mouse cursor. But that's not the target you want. You want a target that's moving around your cursor. And you want for every particle a different target, so they don't hover all at the same place.
There are also some other things that the original does and you don't:
in the original, the particle speed depends on the distance to the target
it seems they can't change the direction instantly, but change the direction of their movement relatively slowly.