1.67.2 Send methods

gradient ->initialise: kind={linear,radial}, p0=point, p1=point, r0=[num]*, r1=[num]*, stops=[chain]

Create the gradient. r0 and r1 are only meaningful when kind is radial; pass @default for a linear gradient and they are stored as @nil. If stops is @default an empty chain is created and stops must be added later with gradient->add_stop or gradient->stops.

See the class introduction for a runnable example.

gradient ->add_stop: fraction=num, colour=colour

Append tuple(fraction, colour) to gradient<-stops. Convenience wrapper equivalent to

send(G?stops, append, new(_, tuple(F, C)))

for the common incremental-build pattern.

gradient ->stops: chain

Replace the colour-stops chain wholesale. The elements should be tuple(fraction, colour) objects; the renderer skips anything else silently.