framed | framed : a metabolic modeling package for python | 3D Animation library

After Microsoft apparently didn't find it necessary to implement the GDI+ components in a presentable way, I have solved the problem now completely differently and low-level.

Thanks to Bjørn for this excellent solution (it's a complete low-level Gif-Editor with UI): https://www.codeproject.com/Articles/1042433/Manipulating-GIF-Color-Tables?msg=5810217#xx5810217xx

You can compute overlapping windows using librosa.utils.frame, with window_length=2048 and hop_length=1024 (50% overlap). The window function can be computed using librosa.filters.get_window with window="hamming"

Each window from the frame function you multiply by the window function. Then you can use pywt.wavedec with wavelet="sym" and level=7 to get the output for each frame. It should have 128 dimensions.

It turns out that I was partially right and wrong.

1. ffmpeg has multiple levels and amounts of internal buffering, depending on input/output formats, filters and codecs: I just didn't create enough frames to see that happening;
2. interaction with the QProcess should happen in the thread in which it was created;
3. for that reason, data cannot be directly written to the write channel from a different thread, so signals must be used instead;
4. the write channel must be closed (from its same thread) when all data has been written in order to ensure completion of the encoding;

Considering the above, I only use the thread to create the images, then emit a signal with the saved QByteArray of each image; finally, after image creation is completed I wait for the actual completion (based on the showinfo filter output) so that the thread is actually considered finished at that point. Some optimization could be used to queue further image creation in case of multiple jobs, but considering that it probably won't improve performance that much, I prefer the current approach.

Here is the revised code, I tested with different formats and it seems to work as expected.

Your name choices are more naturally organized as Radiobutton widgets.

To keep track of the current Frame that's being drawn on your PictureBox, you need a Field to store the current progress and compare it with the number of Frames that the animation contains.

When the progress reaches the last Frame (or any other Frame before the last, whatever is needed), you stop the animation calling ImageAnimator.StopAnimate().

To start the animation, you first check whether ImageAnimator.CanAnimate() (it may not be able to animate the Image you specified). If it can, then you call ImageAnimator.Animate(), passing to the method the Image object and the address of the method that handles the FrameChanged event.

This handler is used to check whether the animation should continue. If all conditions are met (not all Frames have been drawn), Invalidate() the Control used to show the animation and, in its Paint event handler, call ImageAnimator.UpdateFrames() to change the current Frame, then e.Graphics.DrawImage() to draw the Image (drawing the Frame that is now the current).

► As you can see in the visual example, I'm using a Button (btnAnimate) to start the animation. You can move that code to the Form.Shown event handler, if you prefer.
► I've added a loop counter, in case the animation should loop more than once.

This is how it visually works:

This question is really broad, so I'm going to focus in on this part at a high level:

I tried very hard to look for relevant articles but all I can find are basic "one-time" api calls, what am I supposed to do for an entire batch of operations?

I'm guessing when you talk about requests and APIs you're talking about HTTP requests and REST APIs, which are fundamentally "stateless" kinds of things; HTTP requests are self-contained, and the backend doesn't have to keep track of any application state between requests in order to speak HTTP.

But backend applications usually do maintain state, often in the form of databases. For example, many REST APIs expose CRUD (create, read, update, and delete) operations for important business entities — in fact, Stack Overflow probably does exactly this for answers. When I post this answer, my browser will probably send some kind of a "create" request, and when I inevitably notice and fix a typo I will send some kind of "update" request. When you load it in your browser, you will send a "read" request which will get the text of the answer from Stack Overflow's database. Stack Overflow's backend keeps track of my answer between the requests, which makes it possible to send it to many users as part of many different requests.

Your frontend will have to do something similar if your project does things which involve multiple interdependent requests — for example, you would need to keep track of whether the user is authenticated or not in order to show them the login screen, and you would need to hold onto their authentication token to send along with subsequent requests.

Edit: Let's walk through a specific example. As a user, I want to be able to create and read notes. Each note should have a unique ID and a string for its text. On the backend, we'll have a set of CRUD endpoints:

this refers to the most inner class you currently are, so the anonymous MouseAdapter. Use EntranceScreen.this instead.

I'd simplify you logic. Instead of doing this with FormGroup of FormArrays (unless that is not requirement) the best here would be to create FilterComponent which accepts as input exemplary object type CheckboxFilter = { name: string, isChecked: boolean }. Probably you could add id if neccessary. Having that created add Output to your FilterComponent. Now you add to handlers for that BrandChanged and ColorChanged. Based on that you are able to store selected filters and apply them on your frames.

That even allows you to make it more reacive way. You could decalre BehaviourSubject for both Brand and Color and once there is event you could manipulate subject. Later just combainLatest of your frames that came from JSON file or API and apply do it like this:

The imports is slightly different on Nativescript 8