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feat(ui): GPS trail — scale grid on map view

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Add an optional dot/intersection scale grid to the trail map view:
- renderGrid() draws labelled grid lines anchored to display edges
- Grid step auto-selected for ~3 intervals in the shorter dimension
- MIN_GRID_PX=22 prevents density on small/OLED screens; clamp ensures
  minimum 2 intervals on large trails
- Intersections inside the label bbox and north-arrow bbox are suppressed
- Toggle via Hold-Enter action menu (Grid: ON/OFF item in ActionId enum)
- Map title shows 'TRAIL MAP+' when grid is active
- README updated to mention grid toggle

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-05-27 17:33:20 +02:00
parent b9814e48c0
commit 64b924a9c7
2 changed files with 114 additions and 4 deletions
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README.md
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@@ -206,7 +206,7 @@ Three views cycle with **LEFT / RIGHT**:
| View | Content |
|------|---------|
| **Summary** | Total distance, elapsed time, avg speed or pace, point count, tracking status |
| **Map** | Auto-fit dot-and-line plot with cos(lat) aspect correction; segment breaks marked with open/filled dots; north arrow |
| **Map** | Auto-fit dot-and-line plot with cos(lat) aspect correction; segment breaks marked with open/filled dots; north arrow; scale grid (toggle with Enter) |
| **List** | Per-point rows showing local time (HH:MM) and delta distance from the previous point; segment-start rows show `start` |
**Hold Enter** opens the action menu: