#ifndef DRAWING_WINDOW_H
#define DRAWING_WINDOW_H
-#include <QThread>
#include <QWidget>
#include <Qt>
void drawLine(int x1, int y1, int x2, int y2);
void drawRect(int x1, int y1, int x2, int y2);
+ bool sync(unsigned long time = ULONG_MAX);
+
void sleep(unsigned long secs);
void msleep(unsigned long msecs);
void usleep(unsigned long usecs);