tatmapper-app

PDF and print-scale validation

Software contract

• PDF page boxes use standard A4 or Letter dimensions.
• Pixels convert through the project’s stored px/mm exactly once.
• Separate trace strokes remain separate vector paths.
• The PNG uses the same center, scale, and rotation as preview.
• Every page labels the calibration source and planar limitation.
• Every export includes final horizontal and vertical 100 mm rulers.
• A selected verified Print Setup applies independent X/Y correction once in the PDF output transform.
• No-profile output remains unchanged.
• Unverified/reverification-required paths are blocked by default; explicit overrides are labelled unverified in export metadata.
• Instructions say “Print at 100% / Actual Size” and “disable Fit to Page.”
• Oversized content is never silently resized or clipped. Full-size tiled mode preserves assembled dimensions and adds an overview, labels, 5–25 mm overlap, alignment crosses, trim ticks, direction arrows, and per-page rulers.

Automated tests cover conversion constants, page selection, geometry bounds, single-sheet oversize refusal, tiled coverage, PDF header generation, project round-trips, repeated layout stability, anisotropic correction, single application, profile switching, and unverified override labelling.

Physical protocol

1. Export the known calibration fixture.
2. Print at Actual Size/100%; disable scaling and Fit to Page.
3. Measure both the horizontal and vertical 100 mm rulers.
4. Record printer model, driver/app, OS, paper, orientation, settings, and result.
5. Pass only when the owner-approved tolerance is met consistently on the intended printer set.

Follow PHYSICAL_PRINT_VALIDATION.md for multi-stage stencil workflows. Physical validation is not complete until measured hardware evidence is attached to the release ledger. A mathematically correct PDF is not proof of physical output.