Additional annotations for measurement / tagging

[sankhesh]

• Fiducials, text, arrow annotations
• Measurement - Angle, cobb-angle, etc.
• Area stats - rectangle, circle, ellipse, etc.

[floryst]

Fiducials + text annotations first

[1isten]

Any plan to add freehand roi measurement? Currently the Polygon can achieve some random shapes but it would be better to have freehand support like the one provided by cornerstone https://www.cornerstonejs.org/live-examples/planarfreehandroitool

[PaulHax]

@1isten Great idea! Short putt could be to extend the polygon tool: Holding down left mouse drops points as mouse moves?