/* Using Perlin noise. Example adapted from http://courses.haigarmen.com/desn315/files/2013/10/GenerativeArt-2.pdf
See the Processing reference for the noise() function
*/

int step = 10;
float lastx = -999;
float lasty = -999;
float ynoise = random(10);
float y;

void setup(){
size(500, 100);
background(255);
strokeWeight(5);
smooth();
stroke(0, 30);
}
void draw(){
stroke(20, 50, 70,1);

for (int x=20; x<=480; x+=step) {
  y = 10 + noise(ynoise) * 80;
  if (lastx > -999) {
    line(x, y, lastx, lasty);
  }
  lastx = x;
  lasty = y;
  ynoise += 0.1;
}
}