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//! [0]
r1 = QRegion(10, 10, 20, 20)
r1.isNull() // false
r1.isEmpty() // false
r2 = QRegion(40, 40, 20, 20)
r3 = QRegion()
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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