Midterm Exam

gistfile1.txt

class LineDrawer {
  float x1, y1, x2, y2;
  boolean movingForward;

  void drawItself() {
    line (x1, y1, x2, y2);
  }
  
  void update() {
    if (movingForward) {
      x1++;
      x2++;
    }
    else {
      x1--;
      x2--;
    }
  }
  
  void check() {
    if (x2 >= width)
      movingForward = false;
      
    if (x1 <= 0)
      movingForward = true;
  }
  
}

LineDrawer[] lines;

void setup() {
  size(500, 500);
  smooth();
  
  lines = new LineDrawer[4];
  
  for (int i = 0; i < 4; i++) {
    lines[i] = new LineDrawer();
    lines[i].x1 = 0;
    lines[i].y1 = 60 * (i + 1);
    lines[i].x2 = width/2;
    lines[i].y2 = lines[i].y1;
    lines[i].movingForward = true;
  }
}

void draw() {
  background(150);
  
  for (int i=0; i < 4; i++) {
    lines[i].drawItself();
    lines[i].update();
    lines[i].check();
  }
}