User clarified: the X-swap should be in the ARRANGEMENT (east
tiles on screen right), NOT in the image (so map content is
readable). Previous attempts had it the other way around.
Combined state:
- canvasX = -perp + ... (X-swap): east (1102) on screen right,
west (1098) on screen left. x increases left to right.
- drawImage with positive width: no image X-flip. Map content
reads normally, place names not mirrored.
- Labels in normal orientation.
So the X mirror is in the corridor arrangement, not in the
satellite image content. The user can read the map normally.
Final state per user request (KEIN X-Swap, KEIN X-Flip):
- canvasX = (perp + halfPerp + 0.5) * TILE_SIZE: east (1102)
at canvasX 128 (left), west (1098) at canvasX 1152 (right).
Natural order with no swap.
- drawImage with positive width and height: map content reads
normally, no X-flip on the image.
- Labels in normal orientation (no mirrorLabel).
Map is now fully natural: no X swap, no X flip, no mirror label.
Both the arrangement and image content are in standard orientation.
The user wants:
- Natural order arrangement (canvasX = perp + ...): east (1102)
on left, west (1098) on right
- X-mirrored image (NS-mirror): within each tile, the image east
appears on the left of the tile (natural map orientation)
Combined state:
- canvasX = (perp + halfPerp + 0.5) * 256: natural order
- drawImage with negative width: X-flip (NS-mirror)
- All labels in normal orientation (no mirrorLabel)
This matches the user's description: 'die anordnung passt' (arrangement
correct) and 'der x-flip ist immer noch falsch' (image was still
mirrored, now correctly mirrored).
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.
Add explicit X-swap marker comment so the user can verify they're
seeing the new build. Bump canvas width by 2*256 padding so the
X labels (drawn at canvasX + 244) are within the canvas even for
the rightmost drawn tile (east, perp=-2 -> canvasX 1152, label
at 1396). With wider canvas (1792 vs 1280), labels are visible
and the corridor is centred.
Richard Zink