Annotations on User Charts

[liversedge]

It would be really useful to add annotations to a user chart, and these could be extensible, so as new functionality is avilable from planning functions they can be rendered on charts.

We could also use them to integrate into existing functionality such as intervals, season markers and reference lines.

They should be configured as a fourth tab on the user chart settings.

[liversedge]

Some ideas for the initial annotations to support:

• Horizontal and Vertical lines associated with an axis, with a color and style (value from a datafilter for max/min/avg etc)done in v3.6
• Interval markers and react to zoom/interval hovering
• Season events as vertical markers
• Reference lines from activity data (hr and power)
• Linear regression line for data series with color and style done in v3.6
• K means clustering and voronoi for scatter done in v3.6
• Shading rectangle (for zones) with text, color and datafilter for x1,y1,x2,y2 - in (axis coordinates)
• Point callout with x,y value and text (show with an arrow)

[liversedge]

When/if we add interactive annotations to the user chart they should be set as general or per season or per activity depending on context. We can store them in the chart, but remove activity or season based ones when uploading to chart db.
Initially we should just make them general.

[liversedge]

Moving to 3.7 as this is quite a significant feature and will need lots of development effort and testing.