Week 4 Particles - OpenProcessing

Particles_Lesson_4
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Particle[] particles = new Particle[50];
​
void setup() {
  size(640,640);
  for (int i =0; i<particles.length; i++) {
    particles[i] = new Particle(i+2);
  }
}
​
void draw() {
  background(255);
  for (int i =0; i<particles.length; i++) {
    particles[i].motion();
    particles[i].drawParticles();
    particles[i].constraints();
  }
}
​
class Particle {
  PVector location;
  PVector velocity;
  PVector acceleration;
  float topSpeed;
  
  
  Particle(int topSpeed_) {
    location = new PVector(random(width), random(height));
    velocity = new PVector(random(-5,5),random(-5,5));
    topSpeed = topSpeed_;
    acceleration = new PVector();
  }
  
  void motion() {
    PVector mouse = new PVector(mouseX, mouseY);
    if (mousePressed) {
    PVector dir = PVector.sub(mouse,location);
    dir.normalize();
    dir.mult(.5);
    acceleration = dir;
    }
    velocity.add(acceleration);
    velocity.limit(topSpeed/3);
    location.add(velocity);
   
  }
  
  void drawParticles() {
    noStroke();
    fill(125 + sin(radians(frameCount))*125, 125 + cos(radians(frameCount))*125, 125 + sin(radians(-frameCount))*125);
    ellipse(location.x, location.y, 16, 16);
  }
  
  void constraints() {
    if ((location.x>width) || (location.x <0)) {
      velocity.x = velocity.x * -1;
    }
    
    if ((location.y>height) || (location.y <0)) {
      velocity.y = velocity.y * -1;
  }
}
}
​
​