draw a line using mouse

hellomouse.pde

void setup() {
  size(400, 400);
  stroke(255);
  // background(192,64,0);
}

void draw() {
  // background(192,64,0);
  line(150, 25, mouseX, mouseY);
  saveFrame("helloMouse-ouput-###.png");
}

void mousePressed() {
  background(192,64,0);
}