gradient

type Gradient struct {
	Shape  Shape
	Spread Spread

	// Pix2Grad transforms coordinates from pixel space (the arguments to the
	// Image.At method) to gradient space. Gradient space is where a linear
	// gradient ranges from x == 0 to x == 1, and a radial gradient has center
	// (0, 0) and radius 1.
	//
	// This is an affine transform, so it can represent elliptical gradients in
	// pixel space, including non-axis-aligned ellipses.
	//
	// For a linear gradient, the bottom row is ignored.
	Pix2Grad f64.Aff3

	Ranges []Range

	// First and Last are the first and last stop's colors.
	First, Last color.RGBA64
}

type Range struct {
	Offset0 float64
	Offset1 float64
	Width   float64
	R0      float64
	R1      float64
	G0      float64
	G1      float64
	B0      float64
	B1      float64
	A0      float64
	A1      float64
}

type Shape uint8

type Spread uint8

type Stop struct {
	Offset float64
	RGBA64 color.RGBA64
}