The user wanted the tile content to be NS-mirrored (X-flip
on the image) so the corridor orientation matches. The labels
are drawn separately in normal orientation, so they read
normally. Now the arrangement has:
- canvasX = -perp + ... (X-swap): east tiles on screen right
- Image X-flipped (NS-mirror): image east at left of tile
- Labels in corners drawn normally: x=1102, y=707 readable
Combining these, the user looking at the screen sees:
- screen left: west tiles (low x), with image west on the right
- screen right: east tiles (high x), with image east on the left
- All labels readable
So the X coordinates read correctly when the eye scans left
to right across the corridor, and the image content is
NS-mirrored to match the corridor's direction of travel.
Richard Zink
00e59983bf