la-baujmi: start on toki pona logic engine

26 files changed, 0 insertions, 3316 deletions

diff --git a/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/bezier.go b/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/bezier.go
deleted file mode 100644
index f2cd7ab..0000000
--- a/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/bezier.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package gg
-
-import "math"
-
-func quadratic(x0, y0, x1, y1, x2, y2, t float64) (x, y float64) {
-	u := 1 - t
-	a := u * u
-	b := 2 * u * t
-	c := t * t
-	x = a*x0 + b*x1 + c*x2
-	y = a*y0 + b*y1 + c*y2
-	return
-}
-
-func QuadraticBezier(x0, y0, x1, y1, x2, y2 float64) []Point {
-	l := (math.Hypot(x1-x0, y1-y0) +
-		math.Hypot(x2-x1, y2-y1))
-	n := int(l + 0.5)
-	if n < 4 {
-		n = 4
-	}
-	d := float64(n) - 1
-	result := make([]Point, n)
-	for i := 0; i < n; i++ {
-		t := float64(i) / d
-		x, y := quadratic(x0, y0, x1, y1, x2, y2, t)
-		result[i] = Point{x, y}
-	}
-	return result
-}
-
-func cubic(x0, y0, x1, y1, x2, y2, x3, y3, t float64) (x, y float64) {
-	u := 1 - t
-	a := u * u * u
-	b := 3 * u * u * t
-	c := 3 * u * t * t
-	d := t * t * t
-	x = a*x0 + b*x1 + c*x2 + d*x3
-	y = a*y0 + b*y1 + c*y2 + d*y3
-	return
-}
-
-func CubicBezier(x0, y0, x1, y1, x2, y2, x3, y3 float64) []Point {
-	l := (math.Hypot(x1-x0, y1-y0) +
-		math.Hypot(x2-x1, y2-y1) +
-		math.Hypot(x3-x2, y3-y2))
-	n := int(l + 0.5)
-	if n < 4 {
-		n = 4
-	}
-	d := float64(n) - 1
-	result := make([]Point, n)
-	for i := 0; i < n; i++ {
-		t := float64(i) / d
-		x, y := cubic(x0, y0, x1, y1, x2, y2, x3, y3, t)
-		result[i] = Point{x, y}
-	}
-	return result
-}
diff --git a/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/context.go b/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/context.go
deleted file mode 100644
index e828af8..0000000
--- a/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/context.go
+++ /dev/null
@@ -1,795 +0,0 @@
-// Package gg provides a simple API for rendering 2D graphics in pure Go.
-package gg
-
-import (
-	"image"
-	"image/color"
-	"image/png"
-	"io"
-	"math"
-
-	"github.com/golang/freetype/raster"
-	"golang.org/x/image/draw"
-	"golang.org/x/image/font"
-	"golang.org/x/image/font/basicfont"
-	"golang.org/x/image/math/f64"
-)
-
-type LineCap int
-
-const (
-	LineCapRound LineCap = iota
-	LineCapButt
-	LineCapSquare
-)
-
-type LineJoin int
-
-const (
-	LineJoinRound LineJoin = iota
-	LineJoinBevel
-)
-
-type FillRule int
-
-const (
-	FillRuleWinding FillRule = iota
-	FillRuleEvenOdd
-)
-
-type Align int
-
-const (
-	AlignLeft Align = iota
-	AlignCenter
-	AlignRight
-)
-
-var (
-	defaultFillStyle   = NewSolidPattern(color.White)
-	defaultStrokeStyle = NewSolidPattern(color.Black)
-)
-
-type Context struct {
-	width         int
-	height        int
-	im            *image.RGBA
-	mask          *image.Alpha
-	color         color.Color
-	fillPattern   Pattern
-	strokePattern Pattern
-	strokePath    raster.Path
-	fillPath      raster.Path
-	start         Point
-	current       Point
-	hasCurrent    bool
-	dashes        []float64
-	lineWidth     float64
-	lineCap       LineCap
-	lineJoin      LineJoin
-	fillRule      FillRule
-	fontFace      font.Face
-	fontHeight    float64
-	matrix        Matrix
-	stack         []*Context
-}
-
-// NewContext creates a new image.RGBA with the specified width and height
-// and prepares a context for rendering onto that image.
-func NewContext(width, height int) *Context {
-	return NewContextForRGBA(image.NewRGBA(image.Rect(0, 0, width, height)))
-}
-
-// NewContextForImage copies the specified image into a new image.RGBA
-// and prepares a context for rendering onto that image.
-func NewContextForImage(im image.Image) *Context {
-	return NewContextForRGBA(imageToRGBA(im))
-}
-
-// NewContextForRGBA prepares a context for rendering onto the specified image.
-// No copy is made.
-func NewContextForRGBA(im *image.RGBA) *Context {
-	return &Context{
-		width:         im.Bounds().Size().X,
-		height:        im.Bounds().Size().Y,
-		im:            im,
-		color:         color.Transparent,
-		fillPattern:   defaultFillStyle,
-		strokePattern: defaultStrokeStyle,
-		lineWidth:     1,
-		fillRule:      FillRuleWinding,
-		fontFace:      basicfont.Face7x13,
-		fontHeight:    13,
-		matrix:        Identity(),
-	}
-}
-
-// Image returns the image that has been drawn by this context.
-func (dc *Context) Image() image.Image {
-	return dc.im
-}
-
-// Width returns the width of the image in pixels.
-func (dc *Context) Width() int {
-	return dc.width
-}
-
-// Height returns the height of the image in pixels.
-func (dc *Context) Height() int {
-	return dc.height
-}
-
-// SavePNG encodes the image as a PNG and writes it to disk.
-func (dc *Context) SavePNG(path string) error {
-	return SavePNG(path, dc.im)
-}
-
-// EncodePNG encodes the image as a PNG and writes it to the provided io.Writer.
-func (dc *Context) EncodePNG(w io.Writer) error {
-	return png.Encode(w, dc.im)
-}
-
-// SetDash sets the current dash pattern to use. Call with zero arguments to
-// disable dashes. The values specify the lengths of each dash, with
-// alternating on and off lengths.
-func (dc *Context) SetDash(dashes ...float64) {
-	dc.dashes = dashes
-}
-
-func (dc *Context) SetLineWidth(lineWidth float64) {
-	dc.lineWidth = lineWidth
-}
-
-func (dc *Context) SetLineCap(lineCap LineCap) {
-	dc.lineCap = lineCap
-}
-
-func (dc *Context) SetLineCapRound() {
-	dc.lineCap = LineCapRound
-}
-
-func (dc *Context) SetLineCapButt() {
-	dc.lineCap = LineCapButt
-}
-
-func (dc *Context) SetLineCapSquare() {
-	dc.lineCap = LineCapSquare
-}
-
-func (dc *Context) SetLineJoin(lineJoin LineJoin) {
-	dc.lineJoin = lineJoin
-}
-
-func (dc *Context) SetLineJoinRound() {
-	dc.lineJoin = LineJoinRound
-}
-
-func (dc *Context) SetLineJoinBevel() {
-	dc.lineJoin = LineJoinBevel
-}
-
-func (dc *Context) SetFillRule(fillRule FillRule) {
-	dc.fillRule = fillRule
-}
-
-func (dc *Context) SetFillRuleWinding() {
-	dc.fillRule = FillRuleWinding
-}
-
-func (dc *Context) SetFillRuleEvenOdd() {
-	dc.fillRule = FillRuleEvenOdd
-}
-
-// Color Setters
-
-func (dc *Context) setFillAndStrokeColor(c color.Color) {
-	dc.color = c
-	dc.fillPattern = NewSolidPattern(c)
-	dc.strokePattern = NewSolidPattern(c)
-}
-
-// SetFillStyle sets current fill style
-func (dc *Context) SetFillStyle(pattern Pattern) {
-	// if pattern is SolidPattern, also change dc.color(for dc.Clear, dc.drawString)
-	if fillStyle, ok := pattern.(*solidPattern); ok {
-		dc.color = fillStyle.color
-	}
-	dc.fillPattern = pattern
-}
-
-// SetStrokeStyle sets current stroke style
-func (dc *Context) SetStrokeStyle(pattern Pattern) {
-	dc.strokePattern = pattern
-}
-
-// SetColor sets the current color(for both fill and stroke).
-func (dc *Context) SetColor(c color.Color) {
-	dc.setFillAndStrokeColor(c)
-}
-
-// SetHexColor sets the current color using a hex string. The leading pound
-// sign (#) is optional. Both 3- and 6-digit variations are supported. 8 digits
-// may be provided to set the alpha value as well.
-func (dc *Context) SetHexColor(x string) {
-	r, g, b, a := parseHexColor(x)
-	dc.SetRGBA255(r, g, b, a)
-}
-
-// SetRGBA255 sets the current color. r, g, b, a values should be between 0 and
-// 255, inclusive.
-func (dc *Context) SetRGBA255(r, g, b, a int) {
-	dc.color = color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}
-	dc.setFillAndStrokeColor(dc.color)
-}
-
-// SetRGB255 sets the current color. r, g, b values should be between 0 and 255,
-// inclusive. Alpha will be set to 255 (fully opaque).
-func (dc *Context) SetRGB255(r, g, b int) {
-	dc.SetRGBA255(r, g, b, 255)
-}
-
-// SetRGBA sets the current color. r, g, b, a values should be between 0 and 1,
-// inclusive.
-func (dc *Context) SetRGBA(r, g, b, a float64) {
-	dc.color = color.NRGBA{
-		uint8(r * 255),
-		uint8(g * 255),
-		uint8(b * 255),
-		uint8(a * 255),
-	}
-	dc.setFillAndStrokeColor(dc.color)
-}
-
-// SetRGB sets the current color. r, g, b values should be between 0 and 1,
-// inclusive. Alpha will be set to 1 (fully opaque).
-func (dc *Context) SetRGB(r, g, b float64) {
-	dc.SetRGBA(r, g, b, 1)
-}
-
-// Path Manipulation
-
-// MoveTo starts a new subpath within the current path starting at the
-// specified point.
-func (dc *Context) MoveTo(x, y float64) {
-	if dc.hasCurrent {
-		dc.fillPath.Add1(dc.start.Fixed())
-	}
-	x, y = dc.TransformPoint(x, y)
-	p := Point{x, y}
-	dc.strokePath.Start(p.Fixed())
-	dc.fillPath.Start(p.Fixed())
-	dc.start = p
-	dc.current = p
-	dc.hasCurrent = true
-}
-
-// LineTo adds a line segment to the current path starting at the current
-// point. If there is no current point, it is equivalent to MoveTo(x, y)
-func (dc *Context) LineTo(x, y float64) {
-	if !dc.hasCurrent {
-		dc.MoveTo(x, y)
-	} else {
-		x, y = dc.TransformPoint(x, y)
-		p := Point{x, y}
-		dc.strokePath.Add1(p.Fixed())
-		dc.fillPath.Add1(p.Fixed())
-		dc.current = p
-	}
-}
-
-// QuadraticTo adds a quadratic bezier curve to the current path starting at
-// the current point. If there is no current point, it first performs
-// MoveTo(x1, y1)
-func (dc *Context) QuadraticTo(x1, y1, x2, y2 float64) {
-	if !dc.hasCurrent {
-		dc.MoveTo(x1, y1)
-	}
-	x1, y1 = dc.TransformPoint(x1, y1)
-	x2, y2 = dc.TransformPoint(x2, y2)
-	p1 := Point{x1, y1}
-	p2 := Point{x2, y2}
-	dc.strokePath.Add2(p1.Fixed(), p2.Fixed())
-	dc.fillPath.Add2(p1.Fixed(), p2.Fixed())
-	dc.current = p2
-}
-
-// CubicTo adds a cubic bezier curve to the current path starting at the
-// current point. If there is no current point, it first performs
-// MoveTo(x1, y1). Because freetype/raster does not support cubic beziers,
-// this is emulated with many small line segments.
-func (dc *Context) CubicTo(x1, y1, x2, y2, x3, y3 float64) {
-	if !dc.hasCurrent {
-		dc.MoveTo(x1, y1)
-	}
-	x0, y0 := dc.current.X, dc.current.Y
-	x1, y1 = dc.TransformPoint(x1, y1)
-	x2, y2 = dc.TransformPoint(x2, y2)
-	x3, y3 = dc.TransformPoint(x3, y3)
-	points := CubicBezier(x0, y0, x1, y1, x2, y2, x3, y3)
-	previous := dc.current.Fixed()
-	for _, p := range points[1:] {
-		f := p.Fixed()
-		if f == previous {
-			// TODO: this fixes some rendering issues but not all
-			continue
-		}
-		previous = f
-		dc.strokePath.Add1(f)
-		dc.fillPath.Add1(f)
-		dc.current = p
-	}
-}
-
-// ClosePath adds a line segment from the current point to the beginning
-// of the current subpath. If there is no current point, this is a no-op.
-func (dc *Context) ClosePath() {
-	if dc.hasCurrent {
-		dc.strokePath.Add1(dc.start.Fixed())
-		dc.fillPath.Add1(dc.start.Fixed())
-		dc.current = dc.start
-	}
-}
-
-// ClearPath clears the current path. There is no current point after this
-// operation.
-func (dc *Context) ClearPath() {
-	dc.strokePath.Clear()
-	dc.fillPath.Clear()
-	dc.hasCurrent = false
-}
-
-// NewSubPath starts a new subpath within the current path. There is no current
-// point after this operation.
-func (dc *Context) NewSubPath() {
-	if dc.hasCurrent {
-		dc.fillPath.Add1(dc.start.Fixed())
-	}
-	dc.hasCurrent = false
-}
-
-// Path Drawing
-
-func (dc *Context) capper() raster.Capper {
-	switch dc.lineCap {
-	case LineCapButt:
-		return raster.ButtCapper
-	case LineCapRound:
-		return raster.RoundCapper
-	case LineCapSquare:
-		return raster.SquareCapper
-	}
-	return nil
-}
-
-func (dc *Context) joiner() raster.Joiner {
-	switch dc.lineJoin {
-	case LineJoinBevel:
-		return raster.BevelJoiner
-	case LineJoinRound:
-		return raster.RoundJoiner
-	}
-	return nil
-}
-
-func (dc *Context) stroke(painter raster.Painter) {
-	path := dc.strokePath
-	if len(dc.dashes) > 0 {
-		path = dashed(path, dc.dashes)
-	} else {
-		// TODO: this is a temporary workaround to remove tiny segments
-		// that result in rendering issues
-		path = rasterPath(flattenPath(path))
-	}
-	r := raster.NewRasterizer(dc.width, dc.height)
-	r.UseNonZeroWinding = true
-	r.AddStroke(path, fix(dc.lineWidth), dc.capper(), dc.joiner())
-	r.Rasterize(painter)
-}
-
-func (dc *Context) fill(painter raster.Painter) {
-	path := dc.fillPath
-	if dc.hasCurrent {
-		path = make(raster.Path, len(dc.fillPath))
-		copy(path, dc.fillPath)
-		path.Add1(dc.start.Fixed())
-	}
-	r := raster.NewRasterizer(dc.width, dc.height)
-	r.UseNonZeroWinding = dc.fillRule == FillRuleWinding
-	r.AddPath(path)
-	r.Rasterize(painter)
-}
-
-// StrokePreserve strokes the current path with the current color, line width,
-// line cap, line join and dash settings. The path is preserved after this
-// operation.
-func (dc *Context) StrokePreserve() {
-	painter := newPatternPainter(dc.im, dc.mask, dc.strokePattern)
-	dc.stroke(painter)
-}
-
-// Stroke strokes the current path with the current color, line width,
-// line cap, line join and dash settings. The path is cleared after this
-// operation.
-func (dc *Context) Stroke() {
-	dc.StrokePreserve()
-	dc.ClearPath()
-}
-
-// FillPreserve fills the current path with the current color. Open subpaths
-// are implicity closed. The path is preserved after this operation.
-func (dc *Context) FillPreserve() {
-	painter := newPatternPainter(dc.im, dc.mask, dc.fillPattern)
-	dc.fill(painter)
-}
-
-// Fill fills the current path with the current color. Open subpaths
-// are implicity closed. The path is cleared after this operation.
-func (dc *Context) Fill() {
-	dc.FillPreserve()
-	dc.ClearPath()
-}
-
-// ClipPreserve updates the clipping region by intersecting the current
-// clipping region with the current path as it would be filled by dc.Fill().
-// The path is preserved after this operation.
-func (dc *Context) ClipPreserve() {
-	clip := image.NewAlpha(image.Rect(0, 0, dc.width, dc.height))
-	painter := raster.NewAlphaOverPainter(clip)
-	dc.fill(painter)
-	if dc.mask == nil {
-		dc.mask = clip
-	} else {
-		mask := image.NewAlpha(image.Rect(0, 0, dc.width, dc.height))
-		draw.DrawMask(mask, mask.Bounds(), clip, image.ZP, dc.mask, image.ZP, draw.Over)
-		dc.mask = mask
-	}
-}
-
-// Clip updates the clipping region by intersecting the current
-// clipping region with the current path as it would be filled by dc.Fill().
-// The path is cleared after this operation.
-func (dc *Context) Clip() {
-	dc.ClipPreserve()
-	dc.ClearPath()
-}
-
-// ResetClip clears the clipping region.
-func (dc *Context) ResetClip() {
-	dc.mask = nil
-}
-
-// Convenient Drawing Functions
-
-// Clear fills the entire image with the current color.
-func (dc *Context) Clear() {
-	src := image.NewUniform(dc.color)
-	draw.Draw(dc.im, dc.im.Bounds(), src, image.ZP, draw.Src)
-}
-
-// SetPixel sets the color of the specified pixel using the current color.
-func (dc *Context) SetPixel(x, y int) {
-	dc.im.Set(x, y, dc.color)
-}
-
-// DrawPoint is like DrawCircle but ensures that a circle of the specified
-// size is drawn regardless of the current transformation matrix. The position
-// is still transformed, but not the shape of the point.
-func (dc *Context) DrawPoint(x, y, r float64) {
-	dc.Push()
-	tx, ty := dc.TransformPoint(x, y)
-	dc.Identity()
-	dc.DrawCircle(tx, ty, r)
-	dc.Pop()
-}
-
-func (dc *Context) DrawLine(x1, y1, x2, y2 float64) {
-	dc.MoveTo(x1, y1)
-	dc.LineTo(x2, y2)
-}
-
-func (dc *Context) DrawRectangle(x, y, w, h float64) {
-	dc.NewSubPath()
-	dc.MoveTo(x, y)
-	dc.LineTo(x+w, y)
-	dc.LineTo(x+w, y+h)
-	dc.LineTo(x, y+h)
-	dc.ClosePath()
-}
-
-func (dc *Context) DrawRoundedRectangle(x, y, w, h, r float64) {
-	x0, x1, x2, x3 := x, x+r, x+w-r, x+w
-	y0, y1, y2, y3 := y, y+r, y+h-r, y+h
-	dc.NewSubPath()
-	dc.MoveTo(x1, y0)
-	dc.LineTo(x2, y0)
-	dc.DrawArc(x2, y1, r, Radians(270), Radians(360))
-	dc.LineTo(x3, y2)
-	dc.DrawArc(x2, y2, r, Radians(0), Radians(90))
-	dc.LineTo(x1, y3)
-	dc.DrawArc(x1, y2, r, Radians(90), Radians(180))
-	dc.LineTo(x0, y1)
-	dc.DrawArc(x1, y1, r, Radians(180), Radians(270))
-	dc.ClosePath()
-}
-
-func (dc *Context) DrawEllipticalArc(x, y, rx, ry, angle1, angle2 float64) {
-	const n = 16
-	for i := 0; i < n; i++ {
-		p1 := float64(i+0) / n
-		p2 := float64(i+1) / n
-		a1 := angle1 + (angle2-angle1)*p1
-		a2 := angle1 + (angle2-angle1)*p2
-		x0 := x + rx*math.Cos(a1)
-		y0 := y + ry*math.Sin(a1)
-		x1 := x + rx*math.Cos(a1+(a2-a1)/2)
-		y1 := y + ry*math.Sin(a1+(a2-a1)/2)
-		x2 := x + rx*math.Cos(a2)
-		y2 := y + ry*math.Sin(a2)
-		cx := 2*x1 - x0/2 - x2/2
-		cy := 2*y1 - y0/2 - y2/2
-		if i == 0 && !dc.hasCurrent {
-			dc.MoveTo(x0, y0)
-		}
-		dc.QuadraticTo(cx, cy, x2, y2)
-	}
-}
-
-func (dc *Context) DrawEllipse(x, y, rx, ry float64) {
-	dc.NewSubPath()
-	dc.DrawEllipticalArc(x, y, rx, ry, 0, 2*math.Pi)
-	dc.ClosePath()
-}
-
-func (dc *Context) DrawArc(x, y, r, angle1, angle2 float64) {
-	dc.DrawEllipticalArc(x, y, r, r, angle1, angle2)
-}
-
-func (dc *Context) DrawCircle(x, y, r float64) {
-	dc.NewSubPath()
-	dc.DrawEllipticalArc(x, y, r, r, 0, 2*math.Pi)
-	dc.ClosePath()
-}
-
-func (dc *Context) DrawRegularPolygon(n int, x, y, r, rotation float64) {
-	angle := 2 * math.Pi / float64(n)
-	rotation -= math.Pi / 2
-	if n%2 == 0 {
-		rotation += angle / 2
-	}
-	dc.NewSubPath()
-	for i := 0; i < n; i++ {
-		a := rotation + angle*float64(i)
-		dc.LineTo(x+r*math.Cos(a), y+r*math.Sin(a))
-	}
-	dc.ClosePath()
-}
-
-// DrawImage draws the specified image at the specified point.
-func (dc *Context) DrawImage(im image.Image, x, y int) {
-	dc.DrawImageAnchored(im, x, y, 0, 0)
-}
-
-// DrawImageAnchored draws the specified image at the specified anchor point.
-// The anchor point is x - w * ax, y - h * ay, where w, h is the size of the
-// image. Use ax=0.5, ay=0.5 to center the image at the specified point.
-func (dc *Context) DrawImageAnchored(im image.Image, x, y int, ax, ay float64) {
-	s := im.Bounds().Size()
-	x -= int(ax * float64(s.X))
-	y -= int(ay * float64(s.Y))
-	transformer := draw.BiLinear
-	fx, fy := float64(x), float64(y)
-	m := dc.matrix.Translate(fx, fy)
-	s2d := f64.Aff3{m.XX, m.XY, m.X0, m.YX, m.YY, m.Y0}
-	if dc.mask == nil {
-		transformer.Transform(dc.im, s2d, im, im.Bounds(), draw.Over, nil)
-	} else {
-		transformer.Transform(dc.im, s2d, im, im.Bounds(), draw.Over, &draw.Options{
-			DstMask:  dc.mask,
-			DstMaskP: image.ZP,
-		})
-	}
-}
-
-// Text Functions
-
-func (dc *Context) SetFontFace(fontFace font.Face) {
-	dc.fontFace = fontFace
-	dc.fontHeight = float64(fontFace.Metrics().Height) / 64
-}
-
-func (dc *Context) LoadFontFace(path string, points float64) error {
-	face, err := LoadFontFace(path, points)
-	if err == nil {
-		dc.fontFace = face
-		dc.fontHeight = points * 72 / 96
-	}
-	return err
-}
-
-func (dc *Context) drawString(im *image.RGBA, s string, x, y float64) {
-	d := &font.Drawer{
-		Dst:  im,
-		Src:  image.NewUniform(dc.color),
-		Face: dc.fontFace,
-		Dot:  fixp(x, y),
-	}
-	// based on Drawer.DrawString() in golang.org/x/image/font/font.go
-	prevC := rune(-1)
-	for _, c := range s {
-		if prevC >= 0 {
-			d.Dot.X += d.Face.Kern(prevC, c)
-		}
-		dr, mask, maskp, advance, ok := d.Face.Glyph(d.Dot, c)
-		if !ok {
-			// TODO: is falling back on the U+FFFD glyph the responsibility of
-			// the Drawer or the Face?
-			// TODO: set prevC = '\ufffd'?
-			continue
-		}
-		sr := dr.Sub(dr.Min)
-		transformer := draw.BiLinear
-		fx, fy := float64(dr.Min.X), float64(dr.Min.Y)
-		m := dc.matrix.Translate(fx, fy)
-		s2d := f64.Aff3{m.XX, m.XY, m.X0, m.YX, m.YY, m.Y0}
-		transformer.Transform(d.Dst, s2d, d.Src, sr, draw.Over, &draw.Options{
-			SrcMask:  mask,
-			SrcMaskP: maskp,
-		})
-		d.Dot.X += advance
-		prevC = c
-	}
-}
-
-// DrawString draws the specified text at the specified point.
-func (dc *Context) DrawString(s string, x, y float64) {
-	dc.DrawStringAnchored(s, x, y, 0, 0)
-}
-
-// DrawStringAnchored draws the specified text at the specified anchor point.
-// The anchor point is x - w * ax, y - h * ay, where w, h is the size of the
-// text. Use ax=0.5, ay=0.5 to center the text at the specified point.
-func (dc *Context) DrawStringAnchored(s string, x, y, ax, ay float64) {
-	w, h := dc.MeasureString(s)
-	x -= ax * w
-	y += ay * h
-	if dc.mask == nil {
-		dc.drawString(dc.im, s, x, y)
-	} else {
-		im := image.NewRGBA(image.Rect(0, 0, dc.width, dc.height))
-		dc.drawString(im, s, x, y)
-		draw.DrawMask(dc.im, dc.im.Bounds(), im, image.ZP, dc.mask, image.ZP, draw.Over)
-	}
-}
-
-// DrawStringWrapped word-wraps the specified string to the given max width
-// and then draws it at the specified anchor point using the given line
-// spacing and text alignment.
-func (dc *Context) DrawStringWrapped(s string, x, y, ax, ay, width, lineSpacing float64, align Align) {
-	lines := dc.WordWrap(s, width)
-	h := float64(len(lines)) * dc.fontHeight * lineSpacing
-	h -= (lineSpacing - 1) * dc.fontHeight
-	x -= ax * width
-	y -= ay * h
-	switch align {
-	case AlignLeft:
-		ax = 0
-	case AlignCenter:
-		ax = 0.5
-		x += width / 2
-	case AlignRight:
-		ax = 1
-		x += width
-	}
-	ay = 1
-	for _, line := range lines {
-		dc.DrawStringAnchored(line, x, y, ax, ay)
-		y += dc.fontHeight * lineSpacing
-	}
-}
-
-// MeasureString returns the rendered width and height of the specified text
-// given the current font face.
-func (dc *Context) MeasureString(s string) (w, h float64) {
-	d := &font.Drawer{
-		Face: dc.fontFace,
-	}
-	a := d.MeasureString(s)
-	return float64(a >> 6), dc.fontHeight
-}
-
-// WordWrap wraps the specified string to the given max width and current
-// font face.
-func (dc *Context) WordWrap(s string, w float64) []string {
-	return wordWrap(dc, s, w)
-}
-
-// Transformation Matrix Operations
-
-// Identity resets the current transformation matrix to the identity matrix.
-// This results in no translating, scaling, rotating, or shearing.
-func (dc *Context) Identity() {
-	dc.matrix = Identity()
-}
-
-// Translate updates the current matrix with a translation.
-func (dc *Context) Translate(x, y float64) {
-	dc.matrix = dc.matrix.Translate(x, y)
-}
-
-// Scale updates the current matrix with a scaling factor.
-// Scaling occurs about the origin.
-func (dc *Context) Scale(x, y float64) {
-	dc.matrix = dc.matrix.Scale(x, y)
-}
-
-// ScaleAbout updates the current matrix with a scaling factor.
-// Scaling occurs about the specified point.
-func (dc *Context) ScaleAbout(sx, sy, x, y float64) {
-	dc.Translate(x, y)
-	dc.Scale(sx, sy)
-	dc.Translate(-x, -y)
-}
-
-// Rotate updates the current matrix with a clockwise rotation.
-// Rotation occurs about the origin. Angle is specified in radians.
-func (dc *Context) Rotate(angle float64) {
-	dc.matrix = dc.matrix.Rotate(angle)
-}
-
-// RotateAbout updates the current matrix with a clockwise rotation.
-// Rotation occurs about the specified point. Angle is specified in radians.
-func (dc *Context) RotateAbout(angle, x, y float64) {
-	dc.Translate(x, y)
-	dc.Rotate(angle)
-	dc.Translate(-x, -y)
-}
-
-// Shear updates the current matrix with a shearing angle.
-// Shearing occurs about the origin.
-func (dc *Context) Shear(x, y float64) {
-	dc.matrix = dc.matrix.Shear(x, y)
-}
-
-// ShearAbout updates the current matrix with a shearing angle.
-// Shearing occurs about the specified point.
-func (dc *Context) ShearAbout(sx, sy, x, y float64) {
-	dc.Translate(x, y)
-	dc.Shear(sx, sy)
-	dc.Translate(-x, -y)
-}
-
-// TransformPoint multiplies the specified point by the current matrix,
-// returning a transformed position.
-func (dc *Context) TransformPoint(x, y float64) (tx, ty float64) {
-	return dc.matrix.TransformPoint(x, y)
-}
-
-// InvertY flips the Y axis so that Y grows from bottom to top and Y=0 is at
-// the bottom of the image.
-func (dc *Context) InvertY() {
-	dc.Translate(0, float64(dc.height))
-	dc.Scale(1, -1)
-}
-
-// Stack
-
-// Push saves the current state of the context for later retrieval. These
-// can be nested.
-func (dc *Context) Push() {
-	x := *dc
-	dc.stack = append(dc.stack, &x)
-}
-
-// Pop restores the last saved context state from the stack.
-func (dc *Context) Pop() {
-	before := *dc
-	s := dc.stack
-	x, s := s[len(s)-1], s[:len(s)-1]
-	*dc = *x
-	dc.mask = before.mask
-	dc.strokePath = before.strokePath
-	dc.fillPath = before.fillPath
-	dc.start = before.start
-	dc.current = before.current
-	dc.hasCurrent = before.hasCurrent
-}
diff --git a/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/gradient.go b/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/gradient.go
deleted file mode 100644
index 1625520..0000000
--- a/farbfeld/ff-primitive/vendor/github.com/fogleman/gg/gradient.go
+++ /dev/null
@@ -1,202 +0,0 @@
-package gg
-
-import (
-	"image/color"
-	"math"
-	"sort"
-)
-
-type stop struct {
-	pos   float64
-	color color.Color
-}
-
-type stops []stop
-
-// Len satisfies the Sort interface.
-func (s stops) Len() int {
-	return len(s)
-}
-
-// Less satisfies the Sort interface.
-func (s stops) Less(i, j int) bool {
-	return s[i].pos < s[j].pos
-}
-
-// Swap satisfies the Sort interface.
-func (s stops) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}
-
-type Gradient interface {
-	Pattern
-	AddColorStop(offset float64, color color.Co