Both scan problems reported from testing came from the same place: the
content rectangle defaulted to the whole page, so the mechanism meant
to handle margin junk never engaged. Ketun joululaulu has a vertical
scan streak down the right margin and Engel a shadow, and because trim
is tight and per slice, either one sets that slice's width, which sets
the song's widest slice, which scales the whole song down.
Detection can propose it. Staff lines are long horizontal runs; scan
shadows, spine darkening and glass streaks are vertical, so a wide flat
opening keeps one and erases the other. Three corrections were needed
against the corpus:
- Search only rows inside detected systems. A horizontal artefact above
or below the music is itself a long horizontal run reaching the paper
edge, which put Engel's left bound at 0.
- Take a percentile of the staff-line extents, not the maximum. Where
an artefact touches a staff line the two merge into one component: on
Ketun p2 the merged line ends at 1575px against 1544px on the clean
page.
- Take the left bound from the brackets too. A bracket sits left of
every staff line, so a staff-line bound crops it off — visible
immediately when comparing exported slices.
Anchors are now a dataclass carrying their left edge rather than a
(top, bottom) tuple.
Engel now drops 12-14% of page width and its music fills 1920px instead
of leaving the shadow's dead space; Ketun drops 12%.
Existing projects keep their saved rectangle; the editor's new Auto-fit
and Auto-fit all buttons re-propose it without disturbing cuts.
QGraphicsView for the viewport, with cuts and the content rectangle
manipulated by hit-testing in the view rather than as movable items —
the geometry is normalised, so what the screen shows and what the
renderer uses are the same numbers at a different zoom.
Cuts are edited as polylines: double-click adds one, drag moves it,
Ctrl-click inserts a vertex, right-click deletes a vertex or the whole
cut. That is how a straight cut becomes the stepped cut Engel needs.
Slice boundaries are drawn, not just cut lines, so a trim anomaly is
visible before export rather than after. Discarded slices are shaded.
Pages preview at 1800px regardless of source resolution, cached per
page, because re-reading a 4959x7017 vector render on every slider move
is unusable.
Autosave is debounced at 800ms and also fires on close.
Closes#12Closes#14Closes#15Closes#16Closes#17Closes#18Closes#19Closes#20Closes#26
Esa Kataja