Method GradientUpdateNodeProp

svg/gradient.go:237–264

GradientUpdateNodeProp ensures that node has a gradient property of given type

(n Node, prop string, radial bool, stops string)

// GradientUpdateNodeProp ensures that node has a gradient property of given type
func (sv *SVG) GradientUpdateNodeProp(n Node, prop string, radial bool, stops string) (*Gradient, string) {
	ps := n.AsTree().Property(prop)
	if ps == nil {
		gr, url := sv.GradientNewForNode(n, radial, stops)
		n.AsTree().SetProperty(prop, url)
		return gr, url
	}
	pstr := ps.(string)
	trgst := ""
	if radial {
		trgst = "radialGradient"
	} else {
		trgst = "linearGradient"
	}
	url := "url(#" + trgst
	if strings.HasPrefix(pstr, url) {
		gr := sv.GradientByName(n, pstr)
		gr.StopsName = stops
		sv.GradientUpdateStops(gr)
		return gr, NameToURL(gr.Name)
	}
	if strings.HasPrefix(pstr, "url(#") { // wrong kind
		sv.GradientDeleteForNode(n, pstr)
	}
	gr, url := sv.GradientNewForNode(n, radial, stops)
	n.AsTree().SetProperty(prop, url)
	return gr, url
}

// GradientUpdateNodePoints updates the points for node based on current bbox
func (sv *SVG) GradientUpdateNodePoints(n Node, prop string) {