Expanded copyToXY, it doesn't copy the whole src sprite, srcX/Y to srcW/h, added DrawSprite2Surf and DrawLine2Surf
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}