nef | 💊 steroids for Xcode Playgrounds | iOS library

by bow-swift Swift Version: 0.7.1 License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | nef Summary

nef is a Swift library typically used in Mobile, iOS, Xcode, Jekyll applications. nef has no bugs, it has no vulnerabilities and it has low support. However nef has a Non-SPDX License. You can download it from GitHub.

Xcode Playgrounds are a nice tool for prototyping and trying new concepts. However, third party libraries support is a bit cumbersome to add. One of the goals of nef is to make the creation of an Xcode Playground easier with support for one or more libraries. By default, nef can create an Xcode Playground with support for Bow, the Functional Programming companion library for Swift.

Support

Quality

Security

License

Reuse

Support

nef has a low active ecosystem.

It has 260 star(s) with 9 fork(s). There are 9 watchers for this library.

It had no major release in the last 12 months.

There are 8 open issues and 46 have been closed. On average issues are closed in 89 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of nef is 0.7.1

Quality

nef has 0 bugs and 0 code smells.

Security

nef has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

nef code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

nef has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

nef releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

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nef Key Features

No Key Features are available at this moment for nef.

nef Examples and Code Snippets

No Code Snippets are available at this moment for nef.

Community Discussions

Trending Discussions on nef

Correct way to display an img fallback

Subtracting multiple polyhedra continuously from a polyhedron

Converting Polyhedron object to Nef_polyhedron object

Problem with multi-threaded construction of Nef Polyhedrons from a same Polyhedron

How can i make byte array from NEF or another RAW Format and edit it?

Powershell loop is only running once file per filename, even if the filename exists with multiple extensions

CGAL: Why is halfplane represented by six rays?

HTML upload form not recognising RAW format as images, using 'application/octet-stream' instead. How do I validate?

Split by new line but skip if it is enclosed within quotes

access EXIF data in swift

QUESTION

Correct way to display an img fallback

Asked 2022-Apr-03 at 14:11

Premise: I have done a lot of research on how img and source tags work, but every single article only superficially deals with the attributes of these tags.

I need to make sure that if the browser does not support the image format (eg .wepb, but it can be .raw or .nef), or the path/url is wrong, there is a correct fallback to a .jpg, then to the alt. I thought of these two solutions:

...

ANSWER

Answered 2022-Apr-03 at 13:11

Every single article only superficially deals with the attributes of img and source.

For image filetype fallbacks try the type attribute on your elements:

Source https://stackoverflow.com/questions/71719254

QUESTION

Subtracting multiple polyhedra continuously from a polyhedron

Asked 2021-Aug-30 at 09:56

I want to get the result of subtracting multiple (probably hundreds) polyhedra from a polyhedron. I found that the CGAL library's "3D Boolean Operations on Nef Polyhedra" package supports Boolean Operations between Polyhedra. I wanted to use this package to solve my problem, but I ran into a lot of trouble. While I knew the CGAL library was a powerful one, I was completely new to it and had no idea how to use it most effectively to solve my problem. My goal is to use the CGAL library to implement one polyhedron minus multiple polyhedrons, and I'll go into more detail about this problem as well as my approach and the errors that the program produced. I'd appreciate it if you could tell me why the program is producing these errors and how I can efficiently use the CGAL library to implement one polyhedron minus multiple polyhedra.

The problem I want to solve with CGAL: I used MATLAB to get some polyhedra: A,B1,B2,...,Bi,..., Bn(n probably several hundred). I want to get the result of A-B1-B2-...-Bn.

My approach to solve this problem with CGAL library: In fact, only A is a 2-manifold, and Bi were both 3-dimensional surface with boundaries. In order to use CGAL library's "3D Boolean Operations on Nef Polyhedron" package, I turned these surfaces into closed polyhedrons. I saved A as a ".off" format file named "blank.off". Bi was converted to ".off" format, and all Bi were saved in one file named "sv.off". Each Bi is separated by a newline character. I use CGAL::OFF_to_nef_3() to read file "blank.off" into a Nef_polyhedron object nef1. Then I wrote a looping statement, in which I use CGAL::OFF_to_nef_3() to read file "sv.off" into a Nef_polyhedron object nef2 and do nef1-=nef2.

code is as follows:

...

ANSWER

Answered 2021-Aug-30 at 09:56

After playing a little with your inputs, I can say that the most plausible cause for all of your problems is that your insputs are not very clean. If you manage to remove degenerated faces from your OFFs in sv.off, everything should run fine. Now, there is a way to make everything much faster : corefine_and_compute_difference. If I adapt your code to use it, it looks like :

Source https://stackoverflow.com/questions/68860150

QUESTION

Converting Polyhedron object to Nef_polyhedron object

Asked 2021-Aug-12 at 07:27

I want to use the CGAL library to calculate the Boolean difference between two polyhedrons. Both polyhedrons are in the form of .off files. My idea is to first read these two files into two Polyhedron type variables p1 and p2, then initialize Nef_polyhedron type variables nef1 and nef2 with p1 and p2 respectively, and finally find the Boolean difference between nef1 and nef2. My code is as follows:

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ANSWER

Answered 2021-Aug-12 at 07:27

Your input "svreal.off" contains some degenerate faces. You can remove them using CGAL::Polygon_mesh_processing::remove_degenerate_faces() from CGAL/Polygon_mesh_processing/repair_degeneracies.h or use the function OFF_to_nef_3() directly from the istream.

Source https://stackoverflow.com/questions/68741025

QUESTION

Problem with multi-threaded construction of Nef Polyhedrons from a same Polyhedron

Asked 2021-Jun-22 at 17:55

I have a multi-thread program in which a set of 3D Nef Polyhedrons might be constructed from a same polyhedron, the simplified code can be demonstrated as:

...

ANSWER

Answered 2021-Jun-22 at 17:55

On linux, your program aborts with

free(): corrupted unsorted chunks

CGAL::Exact_predicates_exact_constructions_kernel is not thread-safe currently, reading the same number in 2 threads can lead to corruption. There is a PR to make it thread-safe: https://github.com/CGAL/cgal/pull/5402 but it hasn't been merged yet.

Without this branch, one workaround could be to use Simple_cartesian or a similar kernel, but that's going to be slower than doing your construction sequentially with Epeck.

Source https://stackoverflow.com/questions/68086180

QUESTION

How can i make byte array from NEF or another RAW Format and edit it?

Asked 2021-Apr-29 at 18:19

im trying to make simple photo editor (for adjusting brightness, contrast, saturation etc...) in WPF and im using the Magick.NET which contains ToByteArray method but the problem is i can't make ByteArray with this method because i'm getting exception because it doesn't wanna make ByteArray from NEF format for some reason...

My first idea, was to take the NEF format convert it to temporary TIFF File which can be converted with this specific method to ByteArray and that file can be converted to bytearray, but i think is very inconvenient and not much smart.

Second thing is when i have the WritableBitmap. How can i make the image from it for Magick.NET to edit it? Should i make another MagickImage Instance which is created with already created ByteArray and edit that image?

...

ANSWER

Answered 2021-Apr-29 at 18:19

There is already a library that can help you with this: https://www.nuget.org/packages/Magick.NET.SystemWindowsMedia/. Add it to your project and then do image.ToBitmapSource() instead.

Source https://stackoverflow.com/questions/67322197

QUESTION

Powershell loop is only running once file per filename, even if the filename exists with multiple extensions

Asked 2020-Sep-11 at 22:38

I'll be the first to admit that PowerShell isn't my strong suit, but I've pieced together the following after an evening of digging around on the internet. The end goal is to organize a huge drive of images by the DateTaken, as well as sidecar XMP files if they exist. It's probably not the most elegant code, but it almost works.

The last issue, which I can't figure out, is that the foreach loop only executes once per filename, regardless of extension. For example, only DSC00001.arw, DSC00001.xmp, or DSC00001.jpg would be processed.

Any points in the right direction would be appreciated.

Thanks!

...

ANSWER

Answered 2020-Sep-11 at 22:38

I'm not sure why $objFolder.items() doesn't actually return all expected files, but I would suggest using PowerShell's built-in file system provider to discover the actual files in each folder and then use $objFolder.ParseName() to obtain a reference you can pass to GetDetailsOf():

Source https://stackoverflow.com/questions/63837795

QUESTION

CGAL: Why is halfplane represented by six rays?

Asked 2020-Jun-19 at 23:24

I've just started playing with Nef polyhedrons on the plane - the simple program below creates a halfplane, defined by a line y=0, and then this halfplane is explored by the CGAL Explorer.

...

ANSWER

Answered 2020-Jun-16 at 15:52

From the documentation for the explorer:

By recursively composing binary and unary operations one can end with a very complex rectilinear structure. To explore that structure there is a data type Nef_polyhedron_2::Explorer that allows read-only exploration of the rectilinear structure.

Therefore the planar subdivision is bounded symbolically by an axis-parallel square box of infimaximal size centered at the origin of our coordinate system. All structures extending to infinity are pruned by the box. Lines and rays have symbolic endpoints on the box. Faces are circularly closed. Infimaximal here means that its geometric extend is always large enough (but finite for our intuition). Assume you approach the box with an affine point, then this point is always inside the box. The same holds for straight lines; they always intersect the box.

Assuming that these vertices are on the box, my best guess is this:

It's a square, so that's why you get the diagonal rays like 0, 0 -> -1, 1 and 0, 0 -> 1, 1. I'm not an expert though.

Edit: drawing is upside-down, the halfplane is y >= 0, not y <= 0.

Source https://stackoverflow.com/questions/62400746

QUESTION

HTML upload form not recognising RAW format as images, using 'application/octet-stream' instead. How do I validate?

Asked 2020-Jun-10 at 09:05

I am creating an upload screen which allows the user to upload images in RAW format. There are multiple RAW formats and I have a pre defined list of them.

...

ANSWER

Answered 2020-Jun-10 at 09:03

Can anyone tell me why?

The content-type of an uploaded file is provided by the client. It is being reported as application/octet-stream (i.e. some bytes of data in no recognized format) because the browser/OS doesn't that is uploading it doesn't recognize the file type.

Do I have to change the upload form enctype to something other than enctype="multipart/form-data"?

No. The content-type reported for the file is specified for the part of the upload (which consists of multiple parts of form data).

Can anyone tell me how to get the raw file recognised as an image?

Short of making changes to every browser that accesses your website (which isn't practical except under very unusual circumstances), you can't. At least not at this point.

I am trying to validate the upload.

Validating that a file is an image by trusting that the content-type header sent by the client isn't safe anyway.

I have tried using finfo and finfo_file to get a file type (it also returns 'application/octet-stream').

Likely for the same reason that the client couldn't identify it. RAW files are distinctly non-standard.

Processing the image is not an issue.

Then the tools you use to process it are likely the best way to determine if it is the type of data you want.

Source https://stackoverflow.com/questions/62299517

QUESTION

Split by new line but skip if it is enclosed within quotes

Asked 2020-May-09 at 10:51

I have some strings separated by new line(\n) and i want to split by \n i am doing like this

...

ANSWER

Answered 2020-May-09 at 10:51

You can use match instead: either match match quotes eventually followed by another quote, or match any characters but newlines:

Source https://stackoverflow.com/questions/61695488

QUESTION

access EXIF data in swift

Asked 2020-Apr-10 at 09:35

I try to access Exif data with this sample code :

...

ANSWER

Answered 2020-Apr-10 at 09:35

To answer the actual question ;), it looks you are calling the wrong function to get it directly as a dictionary, instead of copying metadata using CGImageSourceCopyMetadataAtIndex use CGImageSourceCopyPropertiesAtIndex instead

Source https://stackoverflow.com/questions/61135794

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install nef

It will warn you if there is a missing dependency and will provide guidance to install it. nef can be consumed as a library in your macOS project. It is an excellent option if you want to use all nef features in your macOS app, even to build new tooling on top of nef. You can read more about how to use nef library in the nef site. Some of nef features can be used directly in Xcode as an Extension. You can install it directly from App Store or downloading the last binary from the releases section. You can create Swift Playgrounds -together with third-party libraries- directly in your iPad using the app nef Playgrounds. You can create a nef badge for your GitHub repository, and let users try your project in their iPads.