Declaration

TConicGradientSampler = class(TCustomCenterLutGradientSampler)

Description

Conical color gradient.

A gradient which goes along the circular arc around a Center. The gradient can be rotated using the Angle property

Mathematics & Algorithm

TConicGradientSampler computes color stops based on polar angle $\theta$ around center $(X_c,Y_c)$:

$$\theta =\text{atan2}(Y-Y_c,X-X_c)-\text{Angle}$$

The normalized offset $u\in [0,1)$ is determined by mapping $\theta (\mathrm{mod}2\pi )$ onto $[0,1]$:

$$u=\frac{\theta (\mathrm{mod}2\pi )}{2\pi }$$

See Also

• Conic Gradient - W3C CSS Images
• TSweepGradientSampler