Week_9_Rainy_Day - OpenProcessing

Week_9_Rainy_Day
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ArrayList<Rain> rains = new ArrayList<Rain>();
 
void setup() {
  size(640, 640);
  noStroke();
}
 
void draw() {
  background(255);
   
  rains.add(new Rain());
  rains.add(new Rain());
 
  for (int i = 0; i < rains.size (); i++) {
    Rain r = rains.get(i);
     
    float boundary = 100-abs(cos(radians(r.location.x/2)))*10;
    r.checkBoundary(boundary);
  }
}
class Rain {
  PVector location;
  PVector acceleration;
  PVector velocity;
  PVector gravityWind;
  
  float a;
  float mass;
  float opacity = 200;
 
  Rain() {
    a = random(3,6);
 
    location = new PVector(random(-300, width+300), -a-30);
    velocity = new PVector();
    acceleration = new PVector();
 
    mass = 40/a;
  }
 
  void applyForce(PVector force) {
    acceleration.add(PVector.div(force, mass));
  }
 
  void checkBoundary(float boundary) {
    velocity.add(acceleration);
    location.add(velocity);
    acceleration.mult(0);
    if (location.y > height-boundary) {
      velocity.y *= 0.8;
      velocity.x = 0;
      fill(93, 138, 168, opacity);
      opacity--;
      if (opacity > 0) {
        ellipse(location.x, location.y, a, a);
      } else {
        rains.remove(this);
      }
    } else {
      gravityWind = new PVector(map(mouseX, 0, width, -0.05, 0.05), map(mouseY, 0, height, 0.4, 0.5));
      fill(93, 138, 168);
      for (int i = 2; i<a;i++) {
      ellipse(location.x, location.y+i*4, i*2, i*2);
      }
      applyForce(gravityWind);
    }
  }
}
​
​