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| /*! |
| \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. |
| */ |