7:55 p.m.
Hi,
When drawing stuff I usually have a lot of overlapping areas.
Sometimes I use a vinyl cutter to cut adhesive foil. Then I need
to select the topmost object and subtract it from every object
which is (partially) covered by the topmost object.
Next, I need to repeat the process with the second-to-topmost
object etc.
I also need to convert all strokes etc. to paths to actually get paths
plotted
with non-zero width, otherwise it's just one cut along the path which is
useless.
I also need to intersect all objects with their respective clip or mask,
if they are clipped or masked. For complex drawings this process takes a
lot of time.
I wondered if there's a plugin or something for "flattening" an image
like that,
essentially converting it to a set of non-overlapping closed paths
without stroke.
If there isn't such a functionality I'd like to program it.
In which way should this be done?
On which branch should I base this?
Are there any major changes to parts of Inkscape planned which would
interfere with this functionality / should I wait for some changes to be
finished before I start?
@Krzysztof Did you finish your API changes etc. you started in your GSoC
project?
Regards
Alexander
9:17 a.m.
New subject: "Flatten" vectors, patch
Hi,
I started reading parts of the source code and added some comments, see
the attached patch file. Somebody who actually knows what all the code
is doing should check if I got everything right before this is used, though.
What's the preferred way for developing new features?
Should I create a local branch or something like that?
Is there need for German translators? I'm a native speaker.
Alexander
9:36 a.m.
New subject: "Flatten" vectors, patch
Hi Alexander,
The normal way to submit patches is via our bug tracker [1]. Look at
the top right of the page for the link to submit a report. Since this
appears to be documentation, don't waste too much time looking to see
if this is a duplicate report.
As for developing new features, yes, it has become somewhat common
practice for people to do their work in a branch and then push that to
Launchpad for testing and eventually proposing the changes for a
merge.
Others will need to speak up about status of German translations.
[1] https://bugs.launchpad.net/inkscape
Welcome to the community!
Cheers,
Josh
On Fri, Nov 14, 2014 at 4:17 PM, Alexander Brock
<a.brock@...2965...> wrote:
Hi,
I started reading parts of the source code and added some comments, see
the attached patch file. Somebody who actually knows what all the code
is doing should check if I got everything right before this is used, though.
What's the preferred way for developing new features?
Should I create a local branch or something like that?
Is there need for German translators? I'm a native speaker.
Alexander
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5:59 a.m.
New subject: "Flatten" vectors, progress, help needed
Hi,
I implemented most of the parts, you can find the code here:
https://code.launchpad.net/~inkscape+alexander/inkscape/flatten
New features:
Path->All Objects to Path
This recursively convertes strokes to paths. If the object has a fill
and a stroke it is duplicated for one copy the stroke is converted to a
path, for the other the stroke ist set to none. Therefore the visual
appearance doesn't (shouldn't) change.
Object->Clip->Intersect
This recursively replaces clipped paths by the path intersected with the
clip path.
Path->Remove Overlap
This doesn't work and I don't understand why.
It's implemented in splivarot.cpp, line 1740
The basic idea is very simple:
1. Get all selected shapes, even indirectly selected ones in groups etc.
2. Sort them so the topmost shape is the first in the list
3. Get a copy of the topmost shape, total_union = copy(topmost_object)
4. Get the next object in the list "current_object", make a copy
"duplicate_object"
5. Make a copy of total_union, name it total_union_duplicate
6. Subtract "total_union_duplicate " from "current_object" using
"sp_selected_path_boolop", with operation "bool_op_diff"
This doesn't work for me, the method never does anything (line 1816)
7. Add "duplicate_object" to "total_union" using
"sp_selected_path_boolop" with operation "bool_op_union"
This also doesn't work, I expect to get exactly 1 object, instead I get
2 (line 1834)
8. If list not empty goto 4
I'm out of ideas why the boolean operation doesn't work for my objects,
it always works perfectly for me when I do it by hand.
Any ideas / comments?
Alexander
1:55 p.m.
New subject: "Flatten" vectors, progress, help needed
On Wed, 2014-12-03 at 21:59 +0100, Alexander Brock wrote:
Path->All Objects to Path
This recursively convertes strokes to paths. If the object has a fill
and a stroke it is duplicated for one copy the stroke is converted to
a path, for the other the stroke ist set to none. Therefore the visual
appearance doesn't (shouldn't) change.
I don't think this is the right menu item name.
Firstly, wouldn't it be Path->All Strokes to Paths, not objects.
Secondly, I'd think about making some of our functions do the right or
expected thing with multiple selections and groups. There's no reason
not to convert every object to path or stroke to path. Our code is just
hyper restrictive about it's inputs sometimes.
I'd obviously like to see fewer menu items overall :-D as it would mean
we're getting closer to optimal design instead of adding items when
features go in.
Martin,
12:21 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
On 04/12/14 05:55, Martin Owens wrote:
I don't think this is the right menu item name.
[...]
I'd obviously like to see fewer menu items overall :-D as it would mean
we're getting closer to optimal design instead of adding items when
features go in.
I agree, I just added the menu so I have something distinct I can play
with without breaking the existing feature. I'd like to make it the
default behaviour of "Stroke to Path" to recurse into groups and
duplicate objects which are filled and stroked, if there are no objections.
I'd also like to make "Clone->Unlink Clone" recurse into groups if there
are no objections.
Alexander
12:40 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
Hi Alexander.
Please have in mind this: http://tavmjong.free.fr/blog/?p=1090
Also, +1 to unlink clones recursive.
Regards, Jabier.
On Thu, 2014-12-04 at 16:21 +0100, Alexander Brock wrote:
On 04/12/14 05:55, Martin Owens wrote:
>
> I don't think this is the right menu item name.
>
> [...]
>
> I'd obviously like to see fewer menu items overall :-D as it would mean
> we're getting closer to optimal design instead of adding items when
> features go in.
I agree, I just added the menu so I have something distinct I can play
with without breaking the existing feature. I'd like to make it the
default behaviour of "Stroke to Path" to recurse into groups and
duplicate objects which are filled and stroked, if there are no objections.
I'd also like to make "Clone->Unlink Clone" recurse into groups if
there
are no objections.
Alexander
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1:14 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
On 04/12/14 16:40, Jabier Arraiza wrote:
Hi Alexander.
Please have in mind this: http://tavmjong.free.fr/blog/?p=1090
Can you tell me how to find out if the fill is painted on top of the
stroke in Inkscape? Also I'll need to figure out if I handle markers
correctly.
Alexander
2:04 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
You can find this property -paint-order- on doxygen in the SPStyle.
You need a special flag at compile time to allow paint order
CPPFLAGS='-DWITH_SVG2', and for the moment you need to put this
paint-order value in the XML editor, no GUI.
About the markers... not sure your question but none and normal - no
special case, rest in the order of appear from bottom to top, no apper
over as normal.
ej:
paint-order:marker stroke ->marker bottom, stroke middle and fill top
paint-order:marker -> marker bottom, fill middle as normal(bottom) and
stroke top as normal (over fill)
Regards, Jabier.
On Thu, 2014-12-04 at 17:14 +0100, Alexander Brock wrote:
On 04/12/14 16:40, Jabier Arraiza wrote:
> Hi Alexander.
>
> Please have in mind this: http://tavmjong.free.fr/blog/?p=1090
Can you tell me how to find out if the fill is painted on top of the
stroke in Inkscape? Also I'll need to figure out if I handle markers
correctly.
Alexander
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4:19 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
On Thu, 2014-12-04 at 18:04 +0100, Jabier Arraiza wrote:
You can find this property -paint-order- on doxygen in the SPStyle.
You need a special flag at compile time to allow paint order
CPPFLAGS='-DWITH_SVG2', and for the moment you need to put this
paint-order value in the XML editor, no GUI.
Actually, it is already enabled in 0.91. No need to set a flag.
There is no GUI yet for this property. The property, I believe, is
supported in Firefox and Chrome but probably not yet in IE and Safari so
I don't want to encourage widespread use at the moment (maybe 0.92).
About the markers... not sure your question but none and normal - no
special case, rest in the order of appear from bottom to top, no apper
over as normal.
ej:
paint-order:marker stroke ->marker bottom, stroke middle and fill top
paint-order:marker -> marker bottom, fill middle as normal(bottom) and
stroke top as normal (over fill)
Regards, Jabier.
On Thu, 2014-12-04 at 17:14 +0100, Alexander Brock wrote:
> On 04/12/14 16:40, Jabier Arraiza wrote:
> > Hi Alexander.
> >
> > Please have in mind this: http://tavmjong.free.fr/blog/?p=1090
>
> Can you tell me how to find out if the fill is painted on top of the
> stroke in Inkscape? Also I'll need to figure out if I handle markers
> correctly.
>
> Alexander
>
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5:57 p.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
On Thu, 2014-12-04 at 23:31 +0100, Jabiertxo Arraiza Cenoz wrote:
> Actually, it is already enabled in 0.91. No need to set a flag.
Thanks for the info.
About this, you know wath features need flags for 0.91 and if still
there is for 0.92?
At the moment there is nothing enabled by -DWITH_SVG2.
There are new filter effects blend modes and compositing modes that need
the flags:
-DWITH_CSSBLEND -DWITH_CSSCOMPOSITE
And the GUI for meshes requires:
-DWITH_MESH
Note: there is a small syntax change to meshes that I haven't made yet.
Tav
6:01 p.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
Thanks!
On Fri, 2014-12-05 at 09:57 +0100, Tavmjong Bah wrote:
On Thu, 2014-12-04 at 23:31 +0100, Jabiertxo Arraiza Cenoz wrote:
> > Actually, it is already enabled in 0.91. No need to set a flag.
> Thanks for the info.
>
> About this, you know wath features need flags for 0.91 and if still
> there is for 0.92?
At the moment there is nothing enabled by -DWITH_SVG2.
There are new filter effects blend modes and compositing modes that need
the flags:
-DWITH_CSSBLEND -DWITH_CSSCOMPOSITE
And the GUI for meshes requires:
-DWITH_MESH
Note: there is a small syntax change to meshes that I haven't made yet.
Tav
1:10 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
On Thu, 2014-12-04 at 16:21 +0100, Alexander Brock wrote:
duplicate objects which are filled and stroked, if there are no
objections.
I'd also like to make "Clone->Unlink Clone" recurse into groups if
there are no objections.
If it's possible to add the feature to the selection code such that the
code for navigating and selecting appropriate objects isn't duplicated,
that would be great.
Maybe something like:
selection->forEachSelectedObjects(callable_method);
selection->forEachSelectedChildren(callable_method);
Make it generic and we can easily reuse it with other methods that
should operate on multiple objects.
Martin,
1:20 a.m.
New subject: Stroke to path behaviour change, Clone unlink behaviour change
On 04/12/14 17:10, Martin Owens wrote:
If it's possible to add the feature to the selection code such that the
code for navigating and selecting appropriate objects isn't duplicated,
that would be great.
ok.
Maybe something like:
selection->forEachSelectedObjects(callable_method);
selection->forEachSelectedChildren(callable_method);
We need to define which parameters the callable_method should take and
if it should be called for the entire selection at once or on individual
objects etc. I'm new to Inkscape so probably somebody else should figure
that out, I'm likely to forget corner cases or something.
Alexander
2:27 a.m.
New subject: "Flatten" vectors, progress, help needed
On 12/03/2014 03:59 PM, Alexander Brock wrote:
Hi,
I implemented most of the parts, you can find the code here:
https://code.launchpad.net/~inkscape+alexander/inkscape/flatten
New features:
Path->All Objects to Path
This recursively convertes strokes to paths. If the object has a fill
and a stroke it is duplicated for one copy the stroke is converted to a
path, for the other the stroke ist set to none. Therefore the visual
appearance doesn't (shouldn't) change.
This would be an awesome feature. Maybe a name like "Fill and Stroke to
Paths" might work? I assume that the resulting "fill" object doesn't
include the 50% of the fill that is under the stroke?
Object->Clip->Intersect
This recursively replaces clipped paths by the path intersected with the
clip path.
IMHO, This might make more sense to make Path > Intersect work on
multiple objects. i.e. the top object is duplicated and intersected with
each object individually underneath. The reason i suggest this is that
clipping also works on bitmaps, so having an option to intersect a clip
path might be a bit odd when it doesn't work. Also, this same working on
multiples behavior would work for Path > Difference too -- so you can
"punch a hole" in multiple objects, and Path > Division, where you can
cut multiple paths up with a single action.
cheers,
ryanlerch
Path->Remove Overlap
This doesn't work and I don't understand why.
It's implemented in splivarot.cpp, line 1740
The basic idea is very simple:
1. Get all selected shapes, even indirectly selected ones in groups etc.
2. Sort them so the topmost shape is the first in the list
3. Get a copy of the topmost shape, total_union = copy(topmost_object)
4. Get the next object in the list "current_object", make a copy
"duplicate_object"
5. Make a copy of total_union, name it total_union_duplicate
6. Subtract "total_union_duplicate " from "current_object" using
"sp_selected_path_boolop", with operation "bool_op_diff"
This doesn't work for me, the method never does anything (line 1816)
7. Add "duplicate_object" to "total_union" using
"sp_selected_path_boolop" with operation "bool_op_union"
This also doesn't work, I expect to get exactly 1 object, instead I get
2 (line 1834)
8. If list not empty goto 4
I'm out of ideas why the boolean operation doesn't work for my objects,
it always works perfectly for me when I do it by hand.
Any ideas / comments?
Alexander
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4:11 a.m.
New subject: "Flatten" vectors, progress, help needed
On 04/12/14 18:27, Ryan Lerch wrote:
On 12/03/2014 03:59 PM, Alexander Brock wrote:
> New features:
> Path->All Objects to Path
This would be an awesome feature.
It's already implemented, you can try it if you check out my
experimental branch and compile it.
Maybe a name like "Fill and Stroke to Paths" might work? I
assume that
the resulting "fill" object doesn't include the 50% of the fill that
is under the stroke?
Currently the resulting filled object does include these 50%. If that's
not desired I would need to duplicate the "stroke" (which was converted
to a path) and subtract it from the "fill".
I don't want to do that (at least not by default), because the
difference operation tends to create (very small) gaps between the objects.
For example, create two ellipses, duplicate the top ellipse, subtract it
from the lower ellipse, take the union of the resulting two objects and
break the path appart => I ended up with four objects, the union of two
ellipses and two very small objects.
These small objects interfer with my applications, so I want to avoid them.
If you want to get rid of the overlap just use the "remove overlap"
function as soon as it works :-)
>
> Object->Clip->Intersect
> This recursively replaces clipped paths by the path intersected with the
> clip path.
IMHO, This might make more sense to make Path > Intersect work on
multiple objects. i.e. the top object is duplicated and intersected
with each object individually underneath.
The intersection method already works with multiple objects, the result
ist the intersection of all selected paths which makes perfect sense to
me and I wouldn't change that.
The reason i suggest this is that clipping also works on bitmaps, so
having an option to intersect a clip path might be a bit odd when it
doesn't work. Also, this same working on multiples behavior would work
for Path > Difference too -- so you can "punch a hole" in multiple
objects, and Path > Division, where you can cut multiple paths up with
a single action.
I currently don't need difference / division / cut for more than two
objects and I'd like to fix the "remove overlap" function first but I
can implement more of these (more complex) boolean operations later.
Alexander
8:29 a.m.
New subject: "Flatten" vectors, progress, help needed
On 03/12/14 21:59, Alexander Brock wrote:
I'm out of ideas why the boolean operation doesn't work for
my objects,
it always works perfectly for me when I do it by hand.
I figured it out: I need to convert objects to paths before performing
boolean operations. It works now (except for a corner case I need to
figure out).
Alexander
9:16 a.m.
Hi,
I started making extensive use of clones and stumbled over the same
problem as discussed in this bug report:
https://bugs.launchpad.net/inkscape/+bug/293896
I'd like to implement recursive unlinking of clones but first I'd like
to know if I should make that a new menu item or change the current
behaviour or something else.
Does somebody have a use case where recursive unlinking of clones is not
wanted?
What about objects which are clipped / masked with clones of paths,
should these be unlinked too?
Alexander
1:41 p.m.
2014-10-26 11:55 GMT+01:00 Alexander Brock <a.brock@...2965...>:
@Krzysztof Did you finish your API changes etc. you started in your
GSoC
project?
I only noticed this e-mail now, after 3 months...
The current status is that I know what to do to have functional and
accurate boolops implemented in 2Geom, but there is still some stuff I
need to finish - mainly add a reasonable intersection API to curves.
To handle elliptical arcs, I will also need to write new code for
intersections between Beziers and arcs and between pairs of arcs.
Regards, Krzysztof
3042
days inactive
3138
days old
inkscape-devel@lists.inkscape.org
19 comments
8 participants
participants (8)
-
Alexander Brock -
Jabier Arraiza -
Jabiertxo Arraiza Cenoz -
Josh Andler -
Krzysztof Kosiński -
Martin Owens -
Ryan Lerch -
Tavmjong Bah