make simple, curved, uncontinuous graphs with [jit.gl.sketch]

Following the example from the js_jitterspline-example.maxpat, I want to make simple smoothed graphs, which would look like what can be done with [plot~] (with defineline curve).

From the script given by the js, i can only obtain graphs which connect the points together. How can I tell it to make it linear, without "looping" it ? Does the problem rely in my use of "beginstroke ..." & "endstroke" ?