QRectF is a class in Qt library for C++ programming language that represents a rectangle in float coordinates. It is commonly used in graphical user interface programming for specifying the position and size of UI elements.
Examples:
1. Creating a rectangle with a width of 100 and height of 50, starting at position (10, 20):
QRectF rect(10, 20, 100, 50);
2. Checking if a point is inside the rectangle:
QPointF point(50, 30);
if(rect.contains(point)) {
// point is inside the rectangle
}
3. Enlarging the rectangle by 10 units in all directions:
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