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/*!

    \example demos/deform

    \title Vector Deformation

    This demo shows how to use advanced vector techniques to draw text 

    using a \c QPainterPath.

    \image deform-demo.png

    We define a vector deformation field in the shape of a lens and apply

    this to all points in a path. This means that what is rendered on

    screen is not pixel manipulation, but modified vector representations of

    the glyphs themselves. This is visible from the high quality of the

    antialiased edges for the deformed glyphs.

    To get a fairly complex path we allow the user to type in text and

    convert the text to paths. This is done using the

    QPainterPath::addText() function.

    The lens is drawn using a single call to QPainter::drawEllipse(),

    using a QRadialGradient to fill it with a specialized color

    table, giving the effect of the sun's reflection and a drop

    shadow. The lens is cached as a pixmap for better performance.

*/