// drawing 2 diagonal lines, with different line width
int s = 400;     // size of square canvas
void setup() { 
  size (s, s);
  stroke(255);    // lines in white 
}

void draw() {
  background(0);
  strokeWeight(4);
  line(0,0,s,s);
  strokeWeight(8);
  line(0, 40, s-40, s); 
}

void keyPressed() {
  save("image.jpg");
}