Sometimes the created path is dislocated

[unfa]

Sometimes when I trace an image with centerline-trace, the resulting path is created not in the same location as my source bitmap, but somewhere else, usually close tho the origin (0,0) of the page.

It seems to be pretty random, I wasn't able to find any pattern there yet.

PS: Thank you so much for this tool, it saves me a lot of work. I design shapes the are then CNC-milled in metal and casted with plastic to produce various promotional gadgets, centerline-trace allows me to easily prepare the shapes for milling.

[jnweiger]

Please add an example bitmap where that errpr happens for you. Thanks.

[Moini]

Also, please add an example svg and tell us which Inkscape version you are using.
Is it 0.91, by any chance? Then the famous layer-transform issue could be a reason.

[jnweiger]

I had this with 0.92.3 recently during a workshop. but I was unable to save the graphics. Very strange. In my case it was as far left of the X-Axis as it should have been right of the x-axis. Maybe the path was even mirror imaged.

[jnweiger]

inkscape-centerline-trace does not parse any scale, offset, or translation matrix of the image.
This asks for code.enhancement.

[Moini]

Imported pdfs could be a possible cause, they seem to mess with the coordinate system, in my experience.

[jnweiger]

Reproduce: import a PNG file, mirror <-> the file, then try inkscape-centerline-trace. The created path will be at negative x coordinates and mirrored.