Name: 2pi Pulse Halo Analog
Rating: 4.9 (34 reviews)
Author: secretsciencelab

A minimal + fast analog watchface that draws your heartrate history as a radial chart.

Data is beautiful. Turn your pulse data into personal art on your watchface. You’re the artist.
A reminder that time is not a straight line. But a dimension with no beginning and no end.
As the chart sweeps around the clock, new data erases old data. Nothing is forever & tomorrow’s a new adventure.
The watchface is powered by your pulse. It comes to life when you put it on. When your pulse stops, it stops too.

FEATURES
- Low power & optimized (under 1ms per update & 0.1% battery per hour on fenix6pro)
- As responsive as a stock watchface when pressing buttons or switching screens. No sacrificing function for form.
- 12-hour radial heart chart that shows both average & max.
- Option to draw the heart chart's bars inward or outward.
- 3 text data fields (Default layout: date, heart rate, next Sunrise/Sunset)
- Up to 4 "progress" data triangles that rotate clockwise (E.g., daily steps %, battery %, body battery %, move bar %)

DESIGN DETAILS
- Smartwatches aren’t physical watches. If we can draw anything on a smartwatch, why copy a physical analog face only to look worse? What’s a better design if we’re free to do anything?
- Classic analog hands suck - they bisect the entire face & waste prime real estate in the center. Physical hands must meet in the middle but digital hands don’t. 
- Physical watches are 3-D, so we can peek under hands to read complications. But digital watches are 2-D - hands cover everything as they sweep around the face.
- Static elements like bezel ticks and numbers are a waste - every pixel should have a purpose
- Plus, how to draw text on a round face? This is a tricky design problem. Watch time elements are round but text likes to live in rectangles.
- Example attempts to solve the hybrid face design problem:
 * Apple watch: square face allows data fields to be moved to the corners.
 * Garmin Crossover: complex dance to move physical hands out of the way.
- This watchface tries a new analog design. It’s a compact presentation on a round face with: analog hands, data scales, text data fields and a radial chart... and has minimum overlapping elements for maximum legibility... while still being zippy and sipping as little power as possible.
- The hour/minute hands occupy a ring region instead of bisecting data elements. Hands can overlap with each other and the radial chart to give an illusion of depth.
- This frees the center for 2 types of data complications: 1) A vertical stack of 3 text data fields. 2) An orbit of 4 data triangles that race clockwise to represent 0-100%. Data triangles stack based on your assigned priority.
- The segments of the radial chart double as bezel ticks for the analog hands.  
- I made this analog face because most CIQ analog faces are pretty but lacking something to be a daily driver. They tend to make the watch laggy when switching screens & drain too much battery. It also sucks when analog hands cover data fields.

TECHNICAL DETAILS
- When there are no changes, a cached BufferedBitmap is displayed without any recompute. Updates are incrementally drawn on the BufferedBitmap.
- Sunrise/Sunset time uses the last GPS location. The last location is saved to Application.Storage as a fallback in case no live location is available.
- Anti-burn-in is auto-enabled for AMOLED devices. In Always-On-Display mode, a checkerboard overlay reduces active pixels to 10% and ensures no pixel is on for more than 3 minutes.

PERMISSIONS
- GPS permission needed to get last GPS location for Sunrise/Sunset Time (but GPS is never activated).
- Garmin Connect fitness profile permission needed to get your heart rate range for drawing the radial chart.
- Sensor History permission needed to read body battery and stress level.

NOTE: The watchface auto-refreshes when you change Settings. But if it's asleep, please wake it with the wrist gesture to pick up the latest changes.