ColorWheel
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Qt has a QColorDialog. If you need to integrate a color wheel on the surface, QColorDialog can not help.
I wrote a small Widget: ColorWheel. Screen:
!http://pic.yupoo.com/liuyanghejerry/Cd2HMcL7/CjZBp.png(ColorWheel)!Though not that good. It works.
Source: https://github.com/liuyanghejerry/Qt-Plus/tree/master/develop/ColorWheel
Feel free to use it in any purpose.