void QPainter::drawPixmap ( int x, int y, int w, int h, const QPixmap & pixmap, int sx, int sy, int sw, int sh )
This is an overloaded function.
Draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the given pixmap , at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy;
我倒是认为它讲了很多东西
