2 Questions about using HTML canvases via canvas-keyboard-repsonse plugin

[defnebu]

I am currently working on an experiment where I am creating canvas drawings of different shapes. Currently I wrote separate functions to create the different shapes. For example function ( ) drawTriangle draws a triangle for a trial, function ( ) drawRect ( ) draws a rectangle, etc. I need to do this for a number of polygons so I was wondering if there's a clever way to compress it.

Also, is there a way in jsPsych to make an array of the canvas objects? I need to iterate over them.