/**
a growing tendril by <a href="http://www.local-guru.net/blog">guru</a>
<br>
click on the sketch to restart
*/

float ofs[];

int len = 10;
int idx = 2;
void setup() {
  size(300,300,JAVA2D);
  smooth();
  ofs = new float[len];
  for( int i =0; i < len; i++) {
    ofs[i] = random( -10,10 );
  }
  frameRate(12);
}

void draw() {
  
  background(255);
  fill(0);
  beginShape();
  curveVertex(150,300);
  for( int i=0; i<idx; i++) {
    curveVertex( 150 + ofs[i] - 4 * ( 10 - i )/len, 300 - i * 25 );
  }
  for( int i=idx-2; i>=0; i--) {
    curveVertex( 150 + ofs[i] + 4 * (10-i)/len, 300 - (i) * 25 );
  }
  curveVertex(150,300);
  endShape(CLOSE);
  idx++;
  if ( idx > len ) {
    idx = len;
  }
}

void mouseClicked() {
  ofs = new float[len];
  for( int i =0; i < len; i++) {
    ofs[i] = random( -10,10 );
  }
  idx=2;
}