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//! [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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