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fix(capture): rotate length-axis rectangle and scale from mask span

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Length axis keeps the approved mask, replaces Flip 180 with a ± angle
slider, and sets scale from wood span along the approved direction rather
than bbox.longSidePx. Widths still sample every 6 in perpendicular to that
axis.
This commit is contained in:
grokbot_ty
2026-09-14 16:37:00 +00:00
parent b781ffeb66
commit b328871549
9 changed files with 201 additions and 45 deletions
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docs/CAPTURE.md
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@@ -33,7 +33,7 @@ Otherwise the app opens Add photo.
3. User sets sheet Auto / Green / Black and sensitivity 0–100 (slider or minus / plus). App updates the control immediately. App recomputes the overlay 2.0 seconds after the last sensitivity change. User adjusts until only the slab remains, then approves. App blocks approve if the mask has no slab pixels; user retakes. The approved mask is the footprint for every later step.
4. App draws the minimum-area bounding rectangle of the mask and the length axis on the long side of that rectangle. User rotates the axis if it does not follow the slab length, then approves the axis.
5. User enters length `L` in inches (1/8 in steps) and thickness (1/8 in steps), then presses Calculate.
6. App sets `scale = longest_axis_px / L`.
6. App sets `scale = longest_axis_px / L` (mask/wood span along the approved direction ÷ user `L`; rectangle is direction only).
7. App computes widths, sqft, and bdft from the mask. App crops the masked slab into a 3:4 portrait frame: slab centered, 80% fill at the widest and tallest points, background transparent. App writes that frame as an inventory PNG (`image/png`, 8-bit RGBA).
8. User sees the transparent PNG and the numbers. Milestone 1 stops here.
@@ -87,13 +87,13 @@ User approves the mask when only the slab remains. That mask is the footprint fo
## Length axis
On the same photo, draw the minimum-area bounding rectangle of the mask and the length axis on the long side of that rectangle. User rotates the axis if it does not follow the slab length, then approves the axis.
On the same photo, keep the approved mask in view and draw the minimum-area bounding rectangle of the mask with the length axis on the long side of that rectangle. User rotates the rectangle (slider with minus and plus) until that direction follows the slab length, then approves the axis.
## Measure
User enters length `L` in inches (1/8 in steps) and thickness (1/8 in steps), then presses Calculate.
- `scale = longest_axis_px / L`
- `scale = longest_axis_px / L` where `longest_axis_px` is the mask/wood span along the approved length direction (slab pixels end-to-end on that axis), not the rectangle edge length. The rectangle sets direction only; user-entered `L` is wood end→end along that direction.
- Widths: min, max, avg, sampled every 6 in along the approved length axis, perpendicular to it
- `sqft = (mask_pixels / scale²) / 144` (2 decimals)
- `bdft = sqft × thickness_in` (2 decimals)