Declaration

TRadialGradientSampler = class(TCustomCenterRadiusLutGradientSampler)

Description

TRadialGradientSampler samples a symmetric 2D circular radial gradient around a center point.

Clamp	Mirror	Repeat

Colors are mapped according to WrapMode.

Mathematics & Algorithm

TRadialGradientSampler calculates normalized radial distance $u$ from center $(X_c,Y_c)$ using Euclidean norm divided by radius $R$:

$$u=\frac{\sqrt{(X-X_c{)}^2+(Y-Y_c{)}^2}}{R}$$