//erase entire background

void erase(){  
  if (keyPressed){
    if (key == 'E') {
      colorMode(RGB);
      background(255);
    }
  }

  //eraser tool sets brush a bit wider and white
  if (keyPressed){
    if (key == 'e') {
      cursor(CROSS);
      stroke(255);
      strokeWeight(25);
      line(pmouseX ,pmouseY ,mouseX ,mouseY); 
    }
  }

}//end eraser