Module span_gradient 

Gradient span generator and gradient functions.

Port of agg_span_gradient.h — provides gradient shape functions (linear, radial, diamond, conic, etc.) and the main SpanGradient generator that combines an interpolator, gradient function, and color function to produce gradient-colored spans.

Structs

GradientConic

Conic (angular) gradient: |atan2(y,x)| * d / pi.

GradientDiamond

Diamond-shaped gradient: max(|x|, |y|).

GradientRadial

Radial gradient using fast integer square root.

GradientRadialD

Radial gradient using f64 square root (higher precision).

GradientRadialFocus

Radial gradient with an off-center focal point.

GradientReflectAdaptor

Reflecting gradient adaptor — mirrors gradient values at boundaries.

GradientRepeatAdaptor

Repeating gradient adaptor — wraps gradient values with modulo.

GradientSqrtXY

Square-root XY gradient: sqrt(|x|*|y|).

GradientX

Linear gradient along the X axis.

GradientXY

XY gradient: |x|*|y| / d.

GradientY

Linear gradient along the Y axis.

SpanGradient

Main gradient span generator.

Constants

GRADIENT_SUBPIXEL_MASK

GRADIENT_SUBPIXEL_SCALE

GRADIENT_SUBPIXEL_SHIFT

Traits

GradientFunction

Trait for gradient shape functions.