Sketchtags

[KTRosenberg]

Note, Please do not merge before To-Do list completed, thoughts appreciated

Changes

• In a sketch file, add this.tag = "tagName" or this.tags = ["tagName1", ... "tagNameN"]properties to assign a tag (or a few).
• In the sketch glyph chart, hover over a tag name (in the right-side list on the screen) to highlight all sketches that have that tag. Click on a tag name to toggle on / off state. This way, multiple tags can be combined if you wish to highlight multiple categories of sketches. The number pad / stroke count mask can also be combined with tag selections.

To-Do

• Assign at least one tag to categorizable sketches, note: tags are not required.
• The "reset tags" button is too similar to the tag selection buttons. Reset functionality is useful, but the button needs to be replaced with something different. It also doesn't have to be a button. I will either temporarily disable the reset (exiting and re-entering the glyph chart auto-resets) or find an alternative UI element. I would appreciate thoughts on this.
• Should multiple tags per sketch be allowed after all?
• General code clean-up, likely put duplicated code in reusable functions if possible

Hard-to-see but visible enough GIF demo

[Kronopath]

This looks good to me overall. A few things I'd comment is:

1. This could be a good first step towards any future plans you guys at the lab are thinking about for sketch organization. I know we've talked about the possibility of having multiple "sketch libraries" that you could selectively load, and this looks like it could be a first step towards that direction.
2. When you click multiple sketch tags, e.g. physics and math, I see two possible behaviours: either highlight every sketch that has physics as well as every sketch that has math, or highlight only sketches that have both the physics and math tags. In other words, either the union of those two sets or the intersection of them.
   Which behaviour works best depends on what you intend the sketch tags to be: if you're looking for them to be closer to one tag per sketch, making them more like categories, then your current system (union of sets) is best. If, though, you intend to emphasize sketches' ability to have multiple tags, then it might be worth considering highlighting the intersection of those sets instead.

Also, leave a comment here, or update your pull request description, when the todo list is complete, if it isn't already. :)

[KTRosenberg]

@Kronopath Thanks for your thoughts. The union of sets makes most sense now, so maybe one tag per sketch should be enforced after all?

Also, any thoughts on the reset functionality? I'm still not sure how it should be represented.

[Kronopath]

I'm not really sure I have much of a better idea of how to implement reset right now. Having it as a button like the tag buttongs (maybe with some slight visual differentiation) makes some sense.