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Sourcecode: qt4-x11 version File versions

src.gui.painting.qregion_unix.cpp

//! [0]
        QRegion r1(10, 10, 20, 20);
        r1.isNull();                // false
        r1.isEmpty();               // false

        QRegion r2(40, 40, 20, 20);
        QRegion r3;
        r3.isNull();                // true
        r3.isEmpty();               // true

        r3 = r1.intersected(r2);    // r3: intersection of r1 and r2
        r3.isNull();                // false
        r3.isEmpty();               // true

        r3 = r1.united(r2);         // r3: union of r1 and r2
        r3.isNull();                // false
        r3.isEmpty();               // false
//! [0]



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