/explore timeline cursor design

[dognotdog]

The current version of the grapher does not have a "static" cursor (fixed point in time) like /browse used to have, but only shows a cursor dynamically that follows mouse movement in the grapher area

The /browse cursor was used to statically highlight data values, and also was the pin for the timeline during zoom operations.

My suggestion would be an alternative implemementation that is slightly more complex, but might working directly in the graphs to highlight data more compelling:

• keep the dynamic cursor as is
• make clicks add/remove static cursors so that values at multiple points in time are highlighted, and can be used for screenshots or during presentations
• maybe pin zooming to the center of the visible cursors, though pinning in general is a tricky issue, as as pinning breaks the symmetry of zooming in / out, eg. when starting with no visible cursors, zooming in and out keeps brings me back to where I started, but if a cursor comes into view when zooming out, zooming in would shift the timeline to keep the cursor in view, and this becomes even more weird with multiple cursors