class Droplet {
  // Node management
  Particle node;
  
  boolean onLeaf = false;
  float yy;
  Leaf myLeaf;
  
  
  // Constructors ///////////////////////////////////////////////////////////////
  Droplet() {
    this(random(0, width), 0); // Start at the top by default
  }
  Droplet(float x, float y) {
    node = ps.makeParticle(random(0.5, 2.0), x, y, 0);
  }
  Droplet(float x, float y, float m, float vx, float vy) {
    node = ps.makeParticle(m, x, y, 0);
    node.setVelocity(vx, vy, 0);
  }
  
  
  // Workings ///////////////////////////////////////////////////////////////////
  void update() {
    if (node.mass() > 2) onLeaf = false;
    // Draw the droplet
    if (onLeaf) {
      float p = ((yy - node.position().y()) / 2);
      if (myLeaf.isLeft) {
        node.moveTo(node.position().x() - p/3, yy + p, 0);
      } else {
        node.moveTo(node.position().x() + p/3, yy + p, 0);
      }
      fill(1, 105, 201, 60);
      stroke(1, 151, 253, 30);
      strokeWeight(8);
      float n = node.mass() * 4;
      float w = 0.25;
      float q = random(-w, w);
      beginShape();
        // Top of the drop
        curveVertex(node.position().x() + q, node.position().y() - n / 2 + q);
        curveVertex(node.position().x() + q, node.position().y() - n / 2 + q);
        // Right-hand side
        curveVertex(node.position().x() + n * 1.25 + q, node.position().y() + q);
        // Bottom
        curveVertex(node.position().x() + q, node.position().y() + n / 2 +q);
        // Left-hand side
        curveVertex(node.position().x() - n * 1.25 + q, node.position().y() + q);
        // Back to the to to finish
        curveVertex(node.position().x() + q, node.position().y() - n / 2 + q);
        curveVertex(node.position().x() + q, node.position().y() - n / 2 + q);
      endShape();
      noStroke();
      fill(179, 222, 253, 80);
      ellipse(node.position().x() - (n / 2), node.position().y() - (n / 2), n / 1.5, n / 1.5);
    } else {
      fill(1, 105, 201, 60);
      stroke(1, 151, 253, 30);
      strokeWeight(8);
      float n = node.mass() * 4;
      float w = 0.25;
      float q = random(-w, w);
      beginShape();
        // Top of the drop
        curveVertex(node.position().x() + q, node.position().y() - n * (2.5 + q));
        curveVertex(node.position().x() + q, node.position().y() - n * (2.5 + q));
        // Right-hand side
        curveVertex(node.position().x() + n + q, node.position().y() + q);
        // Bottom
        curveVertex(node.position().x() + q, node.position().y() + n + q);
        // Left-hand side
        curveVertex(node.position().x() - n + q, node.position().y() + q);
        // Back to the top to finish
        curveVertex(node.position().x() + q, node.position().y() - n * (2.5 + q));
        curveVertex(node.position().x() + q, node.position().y() - n * (2.5 + q));
      endShape();
      noStroke();
      fill(179, 222, 253, 80);
      ellipse(node.position().x() - (n / 2), node.position().y() - (n / 2), n / 1.5, n / 1.5);
    }
  }
  
  
  void setOnLeaf(boolean onLeaf, Leaf myLeaf) {
    if (this.onLeaf == onLeaf) return;
    this.onLeaf = onLeaf;
    this.myLeaf = myLeaf;
    if (onLeaf) {
      yy = node.position().y() + 1;
    }
  }
  
  /*void splatter() {
    System.out.println("SPLATTER");
    float nDrops = node.mass() / 0.6;
    for (int i = 0; i < nDrops; i++) {
      droplets.add(new Droplet(node.position().x(), node.position().y(), 0.6, random(-2, 2), random(3, 1)));
      node.kill(); // Mark this drop for removal
    }
  }*/
}