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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
++
++ /*!
++ \example painting/gradients
++ \title Gradients
++ \examplecategory {Graphics}
++ \ingroup examples-painting
++ \brief Shows how gradients can be used with QPainter.
++
++ \brief In this example we show the various types of gradients that can
++ be used in Qt.
++
++ \image gradients-demo.png
++ {Application with different settings for applying gradients}
++
++ There are three types of gradients:
++
++ \list
++ \li \b{Linear} gradients interpolate colors between start and end points.
++ \li \b{Radial} gradients interpolate colors between a focal point and the
++ points on a circle surrounding it.
++ \li \b{Conical} gradients interpolate colors around a center point.
++ \endlist
++
++ The panel on the right contains a color table editor that defines
++ the colors in the gradient. The three topmost controls determine the red,
++ green and blue components while the last defines the alpha of the
++ gradient. You can move points, and add new ones, by clicking with the left
++ mouse button, and remove points by clicking with the right button.
++
++ There are three example configurations available at the bottom of
++ the page that are provided as suggestions on how a color table could be
++ configured.
++
++ Qt also provides a suite of named gradient presets. They are based on the
++ free WebGradients collection. Click on the name in the Presets box to show
++ the gradient. Use the arrow buttons to browse through the available
++ presets.
++ */