Exercise 17

Improving on our bar code generator

float x = 0;

void setup() {
  size(400, 400);
  background(255);
  stroke(255);
}

void change_line_color() {
  stroke(255, 0, 0);
  line(x, 100, x, 200);
  // now we decide if to use black or white
  if (random(100) > 50) {
    stroke(0);
  } else {
    stroke(255);
  }
}

void draw() {
  // draw black or white line
  line(x, 100, x, 200);

  // sometimes we decide to change the line color
  if (random(100) > 90) {
    change_line_color();
  }
  x = x + 1;
  if (x > width) {
    x = 0;
  }
}