Problem in blinking

[rezas1000]

Hello, in this program I want to blinking of the rectangle.in this way: First, Blue rectangle show.and after 500 msec,Red rectangle show.but, when I run this program,I see A high pause and then red rectangle show and Not Blink well.

#include "lines.h"
#include <QPainter>
#include <QThread>
Lines::Lines(QWidget *parent)
    : QWidget(parent)
{
 
}
 
void Lines::paintEvent(QPaintEvent *e)
{
  for(int i=1;i<=10;i++)
{
    Q_UNUSED(e);
 
  QPainter qp(this);
  QBrush brush(Qt::blue);
  qp.setBrush(brush);
qp.drawRect(100,100,200,200);
QThread::msleep(500);
brush.setColor(Qt::red);
qp.setBrush(brush);
qp.drawRect(100,100,200,200);
  }}

#include "lines.h"
#include <QPainter>
#include <QThread>
Lines::Lines(QWidget *parent)
    : QWidget(parent)
{

}

void Lines::paintEvent(QPaintEvent *e)
{
  for(int i=1;i<=10;i++)
{
    Q_UNUSED(e);

  QPainter qp(this);
  QBrush brush(Qt::blue);
  qp.setBrush(brush);
qp.drawRect(100,100,200,200);
QThread::msleep(500);
brush.setColor(Qt::red);
qp.setBrush(brush);
qp.drawRect(100,100,200,200);
  }}

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