The radial gradient setting is based on SVG. As its name implies, a
**radial gradient** is color shading radiating outwards in a circular direction. Therefore, it requires three properties to define the gradient circle—`cx`

, `cy`

, and `r`

. The gradient circle is the outermost circle for shading, such that no shading can go outside of this. All the gradient positions are defined in ratio values between zero and one with respect to their containing elements. The `cx`

and `cy`

options are at the x, y center position of the outermost circle, whereas `r`

is the radius of the
outmost circle. If `r`

is 0.5, it means the gradient radius is half the diameter of its element, that is, the same size as the containing pane. In other ...

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