svg location error
If I generate an svg within openscad and reimport it, then it does not
appear in the original location. I think the viewbox parameters are
mis-calculated when exported. Any possibility of that being corrected?
OpenSCAD https://www.openscad.org/version 2022.11.18.ci12805 (git
1746d5a83)
On 1/27/2023 6:40 AM, Raymond West wrote:
If I generate an svg within openscad and reimport it, then it does not
appear in the original location. I think the viewbox parameters are
mis-calculated when exported. Any possibility of that being corrected?
I duplicate the problem; I filed
https://github.com/openscad/openscad/issues/4514 .
It is not clear to me whether the problem is in the export or in the
import. I expect that it is at least partially connected to the fact
that SVG likes +Y to go down the page, while OpenSCAD likes +Y to go up
the page.
Thanks. If you edit the svg file, you can fix it so that it imports to
the correct place. It seems to import other svg files OK'ish, provided
the boxview x, y is at more or less 0,0, afaik. I tested it a few
times, the error depends on the size and location of the original
square/other shape.
For your example, the viewbox is <svg width="10mm" height="10mm"
viewBox="10 -20 10 10" . If it is 'corrected to '
<svg width="10mm" height="10mm" viewBox="0 10 10 10" then it imports
correctly, but both may not be displayed in some svg viewers. (Irfan
View displays neither, but firefox and brave, for example displays the
original version.)
It may be necessary to read the <title>OpenSCAD Model</title> to apply
the corrections on importing/whatever (or maybe insist the the image is
at 0,0, and apply a correction of twice the height (not checked that,
however).
On 27/01/2023 18:02, Jordan Brown wrote:
On 1/27/2023 6:40 AM, Raymond West wrote:
If I generate an svg within openscad and reimport it, then it does
not appear in the original location. I think the viewbox parameters
are mis-calculated when exported. Any possibility of that being
corrected?
I duplicate the problem; I filed
https://github.com/openscad/openscad/issues/4514 .
It is not clear to me whether the problem is in the export or in the
import. I expect that it is at least partially connected to the fact
that SVG likes +Y to go down the page, while OpenSCAD likes +Y to go
up the page.
The best place to put theories, analysis, and possible fixes is in the
issue comments at https://github.com/openscad/openscad/issues/4514 .
Having conducted a few more tests, object in different or all regions,
and it seems for openscad exported svg's , if you change the viewbox x
parameter to 0, and the y to the height, it seems to locate correctly on
import back into openscad, but it cannot then be viewed in firefox, etc.
with those changes.
On 27/01/2023 19:20, Raymond West wrote:
Thanks. If you edit the svg file, you can fix it so that it imports to
the correct place. It seems to import other svg files OK'ish, provided
the boxview x, y is at more or less 0,0, afaik. I tested it a few
times, the error depends on the size and location of the original
square/other shape.
For your example, the viewbox is <svg width="10mm" height="10mm"
viewBox="10 -20 10 10" . If it is 'corrected to '
<svg width="10mm" height="10mm" viewBox="0 10 10 10" then it imports
correctly, but both may not be displayed in some svg viewers. (Irfan
View displays neither, but firefox and brave, for example displays the
original version.)
It may be necessary to read the <title>OpenSCAD Model</title> to
apply the corrections on importing/whatever (or maybe insist the the
image is at 0,0, and apply a correction of twice the height (not
checked that, however).
On 27/01/2023 18:02, Jordan Brown wrote:
On 1/27/2023 6:40 AM, Raymond West wrote:
If I generate an svg within openscad and reimport it, then it does
not appear in the original location. I think the viewbox parameters
are mis-calculated when exported. Any possibility of that being
corrected?I duplicate the problem; I filed
https://github.com/openscad/openscad/issues/4514 .It is not clear to me whether the problem is in the export or in the
import. I expect that it is at least partially connected to the fact
that SVG likes +Y to go down the page, while OpenSCAD likes +Y to go
up the page.
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