void rectRound( float x, float y, 
                float ancho, float alto, float radio, 
                boolean con_relleno, color relleno, 
                boolean con_borde, color borde, float trazo ) {

  rectMode(CENTER);
  noStroke();
  if ( con_relleno ) {
  
    fill(relleno);
    
    rect(x, y, ancho-2*radio, alto-2*radio);
    rect(x-ancho/2+radio/2, y, radio, alto-2*radio);
    rect(x+ancho/2-radio/2, y, radio, alto-2*radio);
    rect(x, y-alto/2+radio/2, ancho-2*radio, radio);
    rect(x, y+alto/2-radio/2, ancho-2*radio, radio);
  
  } else noFill();
  
  if ( con_borde ) {
  
    stroke(borde);
    strokeWeight(trazo);
    strokeCap(SQUARE);
    
    line(x-ancho/2+radio, y-alto/2, x+ancho/2-radio, y-alto/2);
    line(x-ancho/2+radio, y+alto/2, x+ancho/2-radio, y+alto/2);
    line(x-ancho/2, y-alto/2+radio, x-ancho/2, y+alto/2-radio);
    line(x+ancho/2, y-alto/2+radio, x+ancho/2, y+alto/2-radio);
    
  }
  
  arc(x-ancho/2+radio, y-alto/2+radio, radio*2, radio*2, PI, TWO_PI-PI/2);
  arc(x+ancho/2-radio, y-alto/2+radio, radio*2, radio*2, TWO_PI-PI/2, TWO_PI);
  arc(x-ancho/2+radio, y+alto/2-radio, radio*2, radio*2, PI/2, PI);
  arc(x+ancho/2-radio, y+alto/2-radio, radio*2, radio*2, 0, PI/2);

}