ramdom_rotate_lines01

void setup() {
  size(500, 500);
  colorMode(HSB, 360, 100, 100, 100);
  background(0, 0, 100);
  strokeWeight(1);
  smooth();
  frameRate(5);
}


void draw() {
  int xstep = 1;
  int ystep = 50;
  float lastx = -999;
  float lasty = -999;
  float ynoise = random(10);
  float ny;

  background(0, 0, 100, 2);
  translate(0, -30);
  stroke(360%frameCount, 80, 90);

  for (int y = 0; y<= height/2; y += xstep) {
    for (int x= 0; x<= width/2; x += ystep   ) {
      ny = y + noise(ynoise) * 80;
      if (lastx > -999) {
        pushMatrix();
        translate(width/2, height/2);
        rotate(frameCount);
        line(x, ny, lastx, lasty);
        popMatrix();
      }
      lastx = x;
      lasty = ny;
      ynoise += 0.1;
    }
  }
}

ランダムな線を回転させてみた．線を1本ずつ回転させたかったのだけれど，全体が回ってしまった．失敗…