Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
++
++ /*!
++ \example painting/deform
++ \title Vector Deformation
++ \examplecategory {Graphics}
++ \ingroup examples-painting
++ \brief Demonstrates how to manipulate the elements of a QPainterPath.
++
++ \brief This example shows how to use advanced vector techniques to draw text
++ using a \c QPainterPath.
++
++ \image deform-demo.png
++ {Application showing various vector deformation settings}
++
++ 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.
++ */