/**
Growing steak in a dark, rainy setting by <a href="http://www.local-guru.net/blog">guru</a>
*/

float b[];
int leaf = 0;

int[] speed;
int[] pos;

boolean lleft = true;
void setup() {
  noiseSeed(1);
  size(300, 300);
  b = new float[40];
  for ( int i=0; i<b.length; i++) {
    b[i] = 15* sin(TWO_PI*-i/2.0/b.length);
  }

  speed = new int[100];
  pos = new int[100];
  for ( int i = 0; i<100; i++) {
    speed[i] = int(random(10, 30));
    pos[i] = int(random(0, 100));
  }

  smooth();
  frameRate(25);
}

void draw() {
  loadPixels();
  for ( int x = 0; x < width; x++) {
    for ( int y=0; y<height; y++) {
      pixels[x+y*width] = color(40+sq(noise(float(x)/width, float(y-frameCount*3)/height))*255);
    }
  }
  updatePixels();
  fill(0);
  strokeWeight(1);
  beginShape();
  for ( int i=b.length-1; i>=0; i--) {
    vertex( 150 + b[i]+map(i, 0, b.length, 0, 10), 120+(i+1)*(200/b.length));
  }
  for ( int i=0; i < b.length; i++) {
    vertex( 150 + b[i]-map(i, 0, b.length, 0, 10), 120+(i+1)*(200/b.length));
  }
  endShape();
  stroke(0);
  strokeWeight(1);
  float l = map( leaf, 0, b.length, 0, 15);
  float ofs = map( leaf, 0, b.length, 0, 10);

  line( 150 + b[leaf] + ( lleft ? -1 : 1 ) * map(leaf, 0, b.length, 0, 10), 120 +(leaf+1) * 200/b.length, 
  150 + b[leaf] + ( lleft ? -1 : 1 ) * ( l + map(leaf, 0, b.length, 0, 10)), 120 + (leaf+1) * 200/b.length - l );

  if ( leaf > 2 ) { 
    pushMatrix();  
    translate( 150 + b[leaf] + ( lleft ? -1 : 1 ) * ( l/2 + map(leaf, 0, b.length, 0, 10)), 120 + (leaf+1) * 200/b.length - l/2);  
    rotate( lleft ? 5*PI/4 : -PI/3);
    ellipse( 0, 0, l, l/3 );

    popMatrix();
  }
  leaf++;

  if (leaf > b.length-1) {
    leaf = 0;
    lleft = !lleft;
  }

  strokeWeight(1);
  stroke(0, 50);
  pushMatrix();
  translate(width/2, height/2);
  rotate(PI/2.4);

  translate(-width/2-40, -height/2);
  for ( int i = 0; i<100; i++) {
    line(pos[i], i* 4, pos[i] + speed[i]*4, i * 4 );
    pos[i] += speed[i];
    pos[i] = pos[i] % width;
  }
  popMatrix();


  for ( int i=b.length-1; i>=1; i--) {
    b[i] = b[i-1];
  }
  b[0] = 15 * sin(TWO_PI*frameCount/2.0/b.length)*sin(TWO_PI*frameCount/2.4/b.length);
  //b[0] += random(-4,4);
}