qt 6.5.1 original

examples/widgets/doc/src/gradients.qdoc

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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
+    \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
+
+    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.
+*/