UI\Draw\Brush\RadialGradient::__construct (UI 2.0.0)UI\Draw\Brush\RadialGradient::__construct — Construct a new Radial Gradient 说明 public UI\Draw\Brush\RadialGradient::__construct(UI\Point $start, UI\Point $outer, float $radius) Shall construct a new radial gradient 参数 start outer radius