Pattern type definition pseudo code

Percentage: float(0..1)
Dimension: int(0..255)
Angle: int(0..360)
Color: object(
	r: Dimension,
	g: Dimension,
	b: Dimension,
	a: Percentage,
)
Stop: object(
	color: Color,
	stop: Percentage,
)
PatternType: string('opaque','linear','radial','conic')
Pattern: object(
	type: PatternType,
	color: Color,                  // only used for type=opaque
	stops: array(Stop),            // only used for type=linear,radial,conic
	angle: Angle,                  // only used for type=linear,conic
	center: array(Percentage)[2],  // only used for type=radial,conic
	size: array(Percentage)[2],    // only used for type=radial
)