Method Stroke

path_stroke.go:658–679

Stroke converts a path into a stroke of width w and returns a new path. It uses cr to cap the start and end of the path, and jr to join all path elements. If the path closes itself, it will use a join between the start and end instead of capping them. The tolerance is the maximum deviation from the

(w float64, cr Capper, jr Joiner, tolerance float64)

// Stroke converts a path into a stroke of width w and returns a new path. It uses cr to cap the start and end of the path, and jr to join all path elements. If the path closes itself, it will use a join between the start and end instead of capping them. The tolerance is the maximum deviation from the original path when flattening Béziers and optimizing the stroke.
func (p *Path) Stroke(w float64, cr Capper, jr Joiner, tolerance float64) *Path {
	if cr == nil {
		cr = ButtCap
	}
	if jr == nil {
		jr = MiterJoin
	}

	q := &Path{}
	halfWidth := math.Abs(w) / 2.0
	for _, pi := range p.Split() {
		rhs, lhs := pi.offset(halfWidth, cr, jr, true, tolerance)
		if rhs != nil {
			q = q.Append(rhs).Append(lhs.Reverse())
		}
	}
	if !FastStroke {
		// fix overlapping and spilled parts
		q = q.Settle(Positive)
	}
	return q
}