ArrayList<Particle> particles;
void setup(){
size(640, 640);
particles = new ArrayList<Particle>();
for(int i = 0; i < 1000; i++){
particles.add(new Particle());
}
background(255);
stroke(0, 20);
strokeWeight(1);
}
void draw(){
for(Particle particle: particles){
float radian = map(noise(mouseX + particle.pos.x * 0.02, mouseY + particle.pos.y * 0.02), 0, 1, 0, TWO_PI * 5) + random(PI / 6.0);
particle.update(radian);
particle.display();
}
}
void keyPressed(){
background(255);
}
class Particle{
PVector pos, pPos;
float step;
Particle(){
pos = new PVector(random(width), random(height));
step = map(random(1), 0, 1, 1, 1.5);
}
void update(float radian){
pPos = pos;
pos = PVector.add(pos, new PVector(step * cos(radian), step * sin(radian)));
if(pos.x < 0 || pos.x >= width || pos.y < 0 || pos.y >= height){
pos = new PVector(random(width), random(height));
pPos = new PVector(pos.x, pos.y);
}
}
void display(){
line(pPos.x, pPos.y, pos.x, pos.y);
}
}