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Drawing using the mouse as brush

Continuing the discussion from Drawing using the mouse as a brush:

I posted a comment on this thread but I don’t think anyone saw it. Bumping by posting as a new topic. Apologies if someone else has covered this.

The gist is, for online experiments, if you click on the demo above (and in my code), and move the mouse somewhat slowly with the mouse held down, the ‘shape’ draws with intermittent pixels (screen shot attached). The top line was drawn quickly and smoothly. The bottom line was drawn slowly and smooth, with increasing speed toward the end. But note, even where the drawing is smooth, there are gaps when direction is changing quickly.