new brush

Have found and fixed a couple of issues since the project was first published. Nicely, right-click saving appears to save the visible 800x800 canvas now, whereas previously it was saving a canvas larger than the viewport.

New ribbon brush added. Toggle with B. It has two modes.  The first draws curves from the centre of the canvas. The second draws curves from the location saved with Z.

It feels nice to have finally set up this little playground for digital scratching. It's like fogging up the screen with breath and drawing a finger through.