triangle.go

c.processor = &triangle.Processor{
	BlurRadius:      2,
	Noise:           0,
	BlurFactor:      2,
	EdgeFactor:      4,
	PointRate:       c.pointRate,
	MaxPoints:       c.trianglePoints,
	PointsThreshold: c.pointsThreshold,
	Wireframe:       c.wireframe,
	StrokeWidth:     c.strokeWidth,
	IsStrokeSolid:   c.isSolid,
	Grayscale:       c.isGrayScaled,
	BgColor:         "#ffffff00",
}

c.triangle = &triangle.Image{*c.processor}

//...

// triangulate triangulates the detected face region
func (c *Canvas) triangulate(data []uint8, size image.Rectangle) ([]uint8, error) {
	// Converts the buffer array to an image.
	img := pixels.PixToImage(data, size)

	// Call the face triangulation algorithm.
	triangled, _, _, err := c.triangle.Draw(img, *c.processor, func() {})
	if err != nil {
		return nil, err
	}
	dst := image.NewNRGBA(triangled.Bounds())
	draw.Draw(dst, triangled.Bounds(), triangled, image.Point{}, draw.Over)

	return pixels.ImgToPix(dst), nil
}