void setup() {
  size(1000,1000);
  background(255);
  smooth();
  
  //line(100,100,400,200);

}

void draw() {
  //background(255);//draw and overlap with white background and again, again
  stroke(0,50);
  if(mousePressed) {
    line(250,250,mouseX,mouseY);//draw over and over
    ellipse(mouseX,mouseY,5,5);
  };
}

void keyPressed() {
 save("myDrawing.jpg"); 
 println("File saved!");//printLine 
}