User wanted NO X-swap and NO image X-flip:
- canvasX = (perp + 2.5) * 256 (no negation): east (perp=-2)
at canvasX 128 (left), west (perp=+2) at canvasX 1152 (right)
- Image drawn with positive width (no X-flip): map content
reads normally (place names, street names not mirrored)
The X coordinates read in their natural geographic order:
- left = high x (east), right = low x (west)
If the user is observing from a south-facing view (cockpit facing
back), their right is the world's left (east), so they see
high x on their right (world's left). x still reads correctly
when facing the same direction as the flight.
The arrangement is now back to the natural order with no
swapping in either direction.
Richard Zink
20ac76e0b1