Declaration

TSweepGradientSampler = class(TCustomCenterLutGradientSampler)

Description

TSweepGradientSampler samples an angular sweep gradient bounded between a specified StartAngle and EndAngle angle.

Mathematics & Algorithm

TSweepGradientSampler maps polar angles $\theta$ bounded between StartAngle (${\theta }_0$) and EndAngle (${\theta }_1$):

$$u=\frac{\theta -{\theta }_0}{{\theta }_1-{\theta }_0}$$

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