The edge marker was drawn outward from the canvas edge, so every one of its
three line segments fell outside the clip and nothing rendered. Measured at a
typical 320 px width: 0 of 3 segments visible on either side. That is the one
case the marker exists for - an out-of-window tone is absent from this picture
by definition, so with the marker clipped away the operator has no signal at all
that a shift is happening. Which is what was reported.
It is now a solid bar along the edge the tone lies beyond, plus a chevron whose
arms open inward from it, so the whole marker sits inside the clip while still
reading as pointing off-picture.
Three further defects in the same code:
The frequency label was pinned to TopStart while its background rect tracked the
tone's frequency, so at 1500 Hz the rect sat at x=278 and the text at x=11. The
rect is gone and the label now sits on whichever side the marker is on.
Markers were drawn after two early returns that fire on an empty or silent
spectrum. A shift is deliberately held through key-up gaps, so the markers were
blinking out during the very silences the shift survives. They now draw
unconditionally, after the spectrum so it cannot bury them.
dashCount floored, leaving up to 8 px of the column undrawn at the bottom.
Also extracts the marker drawing into a DrawScope extension, hoists the shared
colours and the target frequency to file-level constants, and rounds the label
instead of truncating it.
mckero
5a45aab2b1