gradient

type Base struct {

	// the stops for the gradient; use AddStop to add stops
	Stops []Stop `set:"-"`

	// the spread method used for the gradient if it stops before the end
	Spread Spreads

	// the colorspace algorithm to use for blending colors
	Blend colors.BlendTypes

	// the units to use for the gradient
	Units Units

	// the bounding box of the object with the gradient; this is used when rendering
	// gradients with [Units] of [ObjectBoundingBox].
	Box mat32.Box2

	// Transform is the transformation matrix applied to the gradient's points.
	Transform mat32.Mat2

	// ObjectMatrix is the computed effective object transformation matrix for a gradient
	// with [Units] of [ObjectBoundingBox]. It should not be set by end users.
	ObjectMatrix mat32.Mat2 `set:"-"`
}

type Gradient interface {
	image.Image

	// AsBase returns the [Base] of the gradient
	AsBase() *Base

	// Update updates the computed fields of the gradient. It must be
	// called before rendering the gradient, and it should only be called then.
	Update()
}

type Linear struct {
	Base

	// the starting point of the gradient (x1 and y1 in SVG)
	Start mat32.Vec2

	// the ending point of the gradient (x2 and y2 in SVG)
	End mat32.Vec2

	// EffStart is the computed effective transformed starting point of the gradient.
	// It should not be set by end users.
	EffStart mat32.Vec2 `set:"-"`

	// EffEnd is the computed effective transformed ending point of the gradient.
	// It should not be set by end users.
	EffEnd mat32.Vec2 `set:"-"`
}

type Radial struct {
	Base

	// the center point of the gradient (cx and cy in SVG)
	Center mat32.Vec2

	// the focal point of the gradient (fx and fy in SVG)
	Focal mat32.Vec2

	// the radius of the gradient (rx and ry in SVG)
	Radius mat32.Vec2
}

type Spreads int32 //enums:enum -transform lower

type Stop struct {

	// the color of the stop
	Color color.RGBA

	// the position of the stop between 0 and 1
	Pos float32
}

type Units int32 //enums:enum -transform camel-lower