void setup() {
  size(400, 400);
  background(255);
  smooth();
  noStroke();
  colorMode(HSB, 360, 100, 100);
  frameRate(2);
}

void draw() {
  grassBlade( int(random(width)), int(random(30, 160)), int(random(30, 100)), int(random(30, 100)), int(random(-100, 100)), int(random(50)), int(random(height)) );
}

void grassBlade(int positionx, int bladeColorH, int bladeColorS, int bladeColorB, int bend, int thickness, int bladeHeight) {
  fill(bladeColorH, bladeColorS, bladeColorB);
  
  beginShape();
    vertex(positionx, height);
    bezierVertex(positionx, height - (bladeHeight/2), positionx + bend/3, height - (3*bladeHeight/4), positionx + bend, height - bladeHeight);
    bezierVertex(positionx + thickness + .3*bend, height - (3*bladeHeight/4), positionx + thickness, height - (bladeHeight/2), positionx + thickness, height);
  endShape();
}
Exercise 06: Write a function for filling the screen with a pattern that evokes