134 lines
3.9 KiB
Markdown
134 lines
3.9 KiB
Markdown
# Decimal Day Progress Watchface - Implementation Plan
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**Note:** This watchface implements French Revolutionary/Decimal Time, not "metric time" which is a different concept.
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## Concept Overview
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Create a joke/novelty Garmin watchface that displays time as a decimal day progress meter instead of traditional 12/24 hour format.
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### Key Features
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- **10 equal divisions** on the watchface (instead of 12 hours)
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- **Single hand** showing day progress as a decimal (0-10)
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- **Analog display** with tick marks at each decimal position
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- **Optional digital readout** showing exact decimal time
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### Time Mapping
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- Midnight (00:00) → 0.0
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- 6:00 AM → 2.5
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- Noon (12:00) → 5.0
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- 6:00 PM → 7.5
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- Midnight (24:00) → 10.0 (wraps to 0)
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## Technical Implementation
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### Project Structure
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```
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MetricWatchFace/
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├── manifest.xml # App metadata and device compatibility
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├── monkey.jungle # Build configuration
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├── resources/
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│ ├── drawables/
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│ │ └── drawables.xml # Layout definitions
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│ ├── strings/
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│ │ └── strings.xml # Localization
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│ └── settings/
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│ └── settings.xml # User settings (if needed)
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└── source/
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├── DecimalWatchFaceApp.mc # Application entry point
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└── DecimalWatchFaceView.mc # Main watchface view logic
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```
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### Core Calculation
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**Decimal Time Formula:**
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```
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decimalTime = (currentHour + currentMinute/60.0 + currentSecond/3600.0) / 24.0 * 10.0
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```
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**Hand Angle Calculation:**
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```
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handAngle = (decimalTime / 10.0) * 360.0 - 90.0 // -90 to start at top (12 o'clock position)
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```
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### Drawing Components
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1. **Watchface Circle**
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- Use `drawCircle()` or `drawArc()` for outline
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- Draw 10 tick marks at 36° intervals (360°/10)
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2. **Decimal Markers**
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- Place numbers 0-9 around the perimeter
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- Position 0 at top (traditional 12 o'clock position)
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- Position 5 at bottom (traditional 6 o'clock position)
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3. **Progress Hand**
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- Use `fillPolygon()` to draw a triangle/arrow hand
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- Calculate hand coordinates using trigonometry
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- Rotate based on current decimal time
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4. **Digital Display** (optional)
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- Show exact decimal time (e.g., "3.47")
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- Position at center or bottom of face
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### Key Methods
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**DecimalWatchFaceView.mc:**
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- `initialize()` - Set up initial state
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- `onUpdate(dc)` - Main rendering method (called periodically)
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- `computeDecimalTime()` - Calculate current decimal time
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- `drawWatchFace(dc)` - Draw the analog face and markers
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- `drawHand(dc, decimalTime)` - Draw the progress hand
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- `drawDigitalTime(dc, decimalTime)` - Optional digital display
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### Device Compatibility
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Target devices:
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- Fenix series (5, 6, 7)
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- Forerunner series (245, 645, 945)
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- Vivoactive series (3, 4)
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- Other modern Garmin watches with Connect IQ support
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Considerations:
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- Handle different screen sizes/resolutions
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- Support both round and semi-round displays
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- Test with MIP and AMOLED displays
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## Implementation Steps
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1. **Project Setup**
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- Create manifest.xml with app metadata
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- Set up basic directory structure
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- Create application entry point
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2. **Core Logic**
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- Implement decimal time calculation
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- Add time update handling
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- Create view class structure
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3. **Rendering**
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- Draw watchface circle and divisions
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- Add decimal markers (0-9)
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- Implement hand rotation logic
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- Add digital display
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4. **Testing & Refinement**
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- Test in simulator
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- Verify calculations at key times
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- Optimize drawing performance
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- Test on actual device if available
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## Future Enhancements (Optional)
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- Add date display
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- Include battery indicator
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- Show step count or other metrics
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- Customizable colors via settings
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- Alternative hand styles
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- Animation effects
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## References
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- Garmin Connect IQ SDK Documentation
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- Swiss Railway Clock example (analog implementation)
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- Monkey C API reference for graphics primitives
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