//import processing.opengl.*;



int numBranches = 900;
Branch[] plant = new Branch[numBranches];

float warble = 0.013;

int counter = 0;
float x_next;
float y_next;



void setup ()
{

  size(800, 800);
  framerate(30);
  colorMode(RGB, 1.0);
  background(0);

  //noStroke();
  
  x_next = 0;
  y_next = 0;
  
  for( int i = 0; i < numBranches; i++ ) {
    plant[i] = new Branch(x_next, y_next, random(1.75*PI), 10, 1);
    plant[i].calcEnd();
    x_next = plant[i].x_end;
    y_next = plant[i].y_end;
  }

}



void draw ()
{

  //background(0);
  
  fill(0, 0.65);
  noStroke();

  rect(0, 0, width, height);

  stroke(1);

  pushMatrix();

  translate(width/2, height/2);

  int whichBranch = counter % numBranches;
  
  plant[whichBranch] = new Branch(x_next, y_next, random(360), 20, 1);

  x_next = 0;
  y_next = 0;

  for( int i = 0; i <= whichBranch; i++ ) {
    plant[i].x = x_next;
    plant[i].y = y_next;
    plant[i].c = 0.2 + 0.8*float(i)/float(whichBranch);
    plant[i].rot += random(-warble, warble);
    plant[i].place();
    plant[i].calcEnd();
    x_next = plant[i].x_end;
    y_next = plant[i].y_end;
    /*plant[i].rot += random(warble*-1, warble);
    plant[i].calcEnd();
    x_next = plant[i].x_end;
    y_next = plant[i].y_end;*/
  }

  popMatrix();
  
  counter++;

}



class Branch {

  float x;
  float y;
  float rot;
  float len;
  float c;
  float x_end;
  float y_end;

  Branch( float _x, float _y, float _rot, float _len, float _c ) {
    x = _x;
    y = _y;
    rot = _rot;
    len = _len*2;
    c = _c;
  }

  void place() { 
    pushMatrix();
    translate(x, y);
    stroke(c);
    rotate(rot);
    line(0, 0, len, 0);
    popMatrix();
  }
  
  void calcEnd() {
    x_end = x + cos(rot)*len;
    y_end = y + sin(rot)*len;
  }

}