func (p SolidPattern) ColorAt(_, _ float64) color.Color {
	return p.Color
}

func DefaultDrawImageOptions() *DrawImageOptions {
	return &DrawImageOptions{
		Alpha:	1.0,
		Filter:	FilterNearest,
	}
}

func DefaultFillStyle() FillStyle {
	return FillStyle{
		Color:	color.Black,
		Rule:	FillRuleNonZero,
	}
}

func DefaultOptions(width, height int) Options {
	return Options{
		Width:		width,
		Height:		height,
		Antialias:	true,
	}
}

func DefaultStrokeStyle() StrokeStyle {
	return StrokeStyle{
		Color:		color.Black,
		Width:		1.0,
		Cap:		LineCapButt,
		Join:		LineJoinMiter,
		MiterLimit:	4.0,
	}
}

func (s StrokeStyle) IsDashed() bool {
	return len(s.DashPattern) > 0
}

func Pt(x, y float64) Point {
	return Point{X: x, Y: y}
}

func (s StrokeStyle) WithCap(lineCap LineCap) StrokeStyle {
	s.Cap = lineCap
	return s
}

func (s StrokeStyle) WithColor(c color.Color) StrokeStyle {
	s.Color = c
	return s
}

func (f FillStyle) WithColor(c color.Color) FillStyle {
	f.Color = c
	return f
}

func (s StrokeStyle) WithDash(pattern []float64, offset float64) StrokeStyle {
	s.DashPattern = pattern
	s.DashOffset = offset
	return s
}

func (s StrokeStyle) WithJoin(join LineJoin) StrokeStyle {
	s.Join = join
	return s
}

func (s StrokeStyle) WithMiterLimit(limit float64) StrokeStyle {
	s.MiterLimit = limit
	return s
}

func (s StrokeStyle) WithPattern(p Pattern) StrokeStyle {
	s.Pattern = p
	return s
}

func (f FillStyle) WithPattern(p Pattern) FillStyle {
	f.Pattern = p
	return f
}

func (f FillStyle) WithRule(r FillRule) FillStyle {
	f.Rule = r
	return f
}

func (s StrokeStyle) WithWidth(w float64) StrokeStyle {
	s.Width = w
	return s
}

type FillStyle struct {
	// Color is the fill color.
	Color	color.Color

	// Rule is the fill rule (NonZero or EvenOdd).
	Rule	FillRule

	// Pattern is an optional pattern brush for complex fills.
	// When set, takes precedence over Color.
	Pattern	Pattern
}

type StrokeStyle struct {
	// Color is the stroke color.
	Color	color.Color

	// Width is the line width in pixels.
	Width	float64

	// Cap is the line cap style.
	Cap	LineCap

	// Join is the line join style.
	Join	LineJoin

	// MiterLimit is the limit for miter joins.
	// When the miter length exceeds this, a bevel join is used instead.
	MiterLimit	float64

	// DashPattern defines the dash/gap pattern.
	// nil or empty means solid line.
	DashPattern	[]float64

	// DashOffset is the starting offset into the dash pattern.
	DashOffset	float64

	// Pattern is an optional pattern brush for complex strokes.
	// When set, takes precedence over Color.
	Pattern	Pattern
}

type DrawImageOptions struct {
	// SrcRect is the source rectangle within the image.
	// If nil, the entire image is used.
	SrcRect	*image.Rectangle

	// DstRect is the destination rectangle on the surface.
	// If nil, the image is drawn at At with its original size.
	DstRect	*image.Rectangle

	// Alpha is the opacity (0.0 = transparent, 1.0 = opaque).
	// Default: 1.0
	Alpha	float64

	// Filter is the interpolation mode for scaling.
	Filter	Filter
}

type SolidPattern struct {
	Color color.Color
}

type Point struct {
	X, Y float64
}

type Options struct {
	// Width is the surface width in pixels.
	Width	int

	// Height is the surface height in pixels.
	Height	int

	// Antialias enables anti-aliased rendering.
	// Default: true
	Antialias	bool

	// BackgroundColor is the initial background color.
	// Default: transparent
	BackgroundColor	color.Color

	// Custom options for specific backends.
	Custom	map[string]any
}

type Pattern interface {
	// ColorAt returns the color at the given coordinates.
	ColorAt(x, y float64) color.Color
}