Write pro-tips about point and tooltip in documentation

[light-and-salt]

Points, especially the enlarged ones, are not very easy to mouseover. You have to put mouse on the edge of a point to see the tooltip.

In this example I think it's better to use solid marks because they are easier to mouseover:

On the other hand, when marks overlap with each other, hover on edge actually works well. In the example below, hover on edge allows more marks to be picked up.

[kanitw]

I think these are valid concerns that can be fixed by modifying the
visualization.

I think we should just write a section in the tooltip tutorial suggesting
how users can write specs that works well with tooltip (or throw warnings).

But we can t really make automatically intervention without potentially
introducing more errors.

On Fri, Apr 8, 2016 at 10:51 AM Zening notifications@github.com wrote:

circles, especially the enlarged ones, are not very easy to mouseover. You
have to put mouse on the edge of a circle to see the tooltip.

[image: point]
https://cloud.githubusercontent.com/assets/822034/14392545/b6fccfbc-fd76-11e5-9057-1ffb9ab1e2a5.png

solutions:

1. use solid marks with tooltip
   [image: bin1]
   https://cloud.githubusercontent.com/assets/822034/14392664/527401a4-fd77-11e5-8913-262f4f2dce71.png
2. show tooltip when mouse is within the empty space of a hollow mark.

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#32

[light-and-salt]

Close! This is PR #37