fidel | A basic javascript controller | Runtime Evironment library
kandi X-RAY | fidel Summary
kandi X-RAY | fidel Summary
Fidel is a simple controller for all of your javascript widgets. It is inspired from spine.js and backbone.js, but without any of the model/route stuff. More docs coming soon...
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QUESTION
I am trying to learn to make 3D games in JavaScript using HTML 2D canvas. I was following this post about it and I made a simple scene that you can move around in.
What I need help with is figuring out how to make the effect of the player turning their head, to look side to side and behind them.
Here is what I have:
Code (also on codepen)
html:
...ANSWER
Answered 2021-Jun-14 at 03:09First of all, you should not update the coordinates of the crates from the movement of the camera. Instead, let the camera have its own position in 3D space, update that position when you want the player to move, and then subtract the camera position from the crates' positions when calculating the 2D space coordinates. This will make things much easier when you later want to add, for example, the ability for the camera to rotate or the crates themselves to move.
Now to add a rotation capability to the camera, you will need to define a rotation matrix for it in addition to a position. Then, when rendering the crates, you transform the crate coordinates (after subtracting the camera's position) using the inverse of the camera's rotation matrix. This will give you the view space coordinates of the crates, which should be projected onto the 2D space for rendering.
There are many ways to create a rotation matrix depending on what parameters you have. A common one is the Rodrigues rotation formula or "axis-angle" formula, which is used when you have an axis of rotation and an angle to rotate about that axis. Another one is from Euler angles. And if you aren't familiar with matrices and linear algebra, I would recommend you to learn it (there are a lot of free resources available online) as it is used extensively in 3D game development.
QUESTION
Hi, I'm learning programming since yesterday. How I can tell my browser to click this?
...ANSWER
Answered 2021-May-27 at 19:41try this css_selector :
QUESTION
I have the following dataset:
...ANSWER
Answered 2021-May-09 at 20:08Try with merge
QUESTION
I have to implement a tree structure in C++ (a trie to be exact). It's on the hot path and will presumably get very big (hard to give an expectation, maybe around 1mio nodes).
Therefore, I am currently thinking about how to implement the structure as efficiently as possible. I have two ideas in mind:
The first is rather straight forward: Allocate all nodes on the heap, manage the pointers and denote the children of a node via pointers to the objects on the heap. However, I'm afraid that the repeated allocations (calls of new) will be slow. Of course, fidelling around with raw pointers is always a little dangerous and cumbersome as well.
The second idea would be to store all nodes in a pool. I would use a vector which holds all nodes. The children of a node would be denoted by a set of indices into this vector. Therefore, we could reserve 1mio nodes at the start of the program and have arguably very few resizes. However, when there would occur resizes, they would obviously be immensely expensive.
How would you suggest to approach the problem? Which downsides weigh heavier?
Great thanks in advance!
...ANSWER
Answered 2021-Apr-09 at 20:39The standard efficient C++ way of doing that is to write your data structure without worrying about how data are allocated, and use a dedicated allocator template parameter (like std::vector or std::map). This method helps to keep your code maintainable (thanks to separation of concerns) and be still quite efficient (thanks to templates). With this solution, you can first write your code easily (with the approach n°1) and then optimize allocations easily too (using for example the approach n°2).
Regarding the optimization of allocation: yes, new & delete could be slow (despite some platforms do this very efficiently).
Since there are no node deleted, you can use a very fast monotonic arena/stack-based allocator
(you can take a look to std::pmr::monotonic_buffer_resource that seems to do that). The idea is to stack small allocated memory regions in memory chunks. Chunks can be pre-allocated or allocated on the fly one by one (possibly using a growing policy, but without resizing data). The chunk pointers can be stored in a very-small data structure (possibly fixed-sized array). When your data structure is deleted, you just need to delete the few chunks (you could even recycle them in loops). This strategy should be cheaper than your second approach, since resizing a vector is quite expensive. For more information, you can look the CppCon 2017 talk of John Lakos on Local ('Arena') Memory Allocators.
QUESTION
ANSWER
Answered 2021-Mar-15 at 22:56// this is incorrect export syntax
export default data = [
...
]
QUESTION
I am trying to scrape a page from Fidelity Investments using a Python script. I have a problem with Beautifulsoup which I am unable to solve after many attempts.
My code:
...ANSWER
Answered 2021-Mar-09 at 07:07soup.find_all() creates a list of span elements that matches your selection and you can not access the the contents directly.
Option#1 - Iterate over your newResult to get the texts of each span:
QUESTION
I am trying to use importXML to get an automatic sector update and industry for my stocks in google sheets. In this case, in cell A5, is the name of the ticker. Normally, I would expect the following website:
https://eresearch.fidelity.com/eresearch/evaluate/snapshot.jhtml?symbols=AAPL
Where instead of AAPL, I wish to insert "A5"
Furthermore, I wish to receive the "Information Technology" in one formula and "Technology Hardware, Storage & Peripherals" in another subheading.
The formula I have created is the following:
=ALS(ISLEEG(A5);"";importxml("https://eresearch.fidelity.com/eresearch/goto/evaluate/snapshot.jhtml?symbols="&A5;"/html/body/table/tbody/tr/td[4]/table[2]/tbody/tr/td[1]/div[3]/div[8]"))
It is however, not working, can someone please help me?
Thanks much in advance.
...ANSWER
Answered 2021-Mar-07 at 01:09I believe your goal as follows.
- You want to retrieve the values of
Information TechnologyandTechnology Hardware, Storage & Peripherals. - In the case of
https://eresearch.fidelity.com/eresearch/evaluate/snapshot.jhtml?symbols=AAPL, you want to retrieve, the values ofSector (GICS®)andIndustry (GICS®).
In this case, I thought that the values might be able to be retrieved by a xpath. The sample xpath is as follows.
Sample xpath:QUESTION
I'm trying to enable full fidelity in Change Feed by using the following code:
...ANSWER
Answered 2021-Feb-25 at 01:24Public preview will be announced shortly, you are using a preview SDK and the APIs are enabled there for users to leverage them once public preview is announced and enrollment is possible. Stay tuned :)
QUESTION
I've been programming in React for a couple days now and have come across an issue utilizing a JSON file.
I'm currently using a hard coded list of...
...ANSWER
Answered 2021-Feb-22 at 17:32From your comments it looks like the JSON is being imported using
QUESTION
I am creating a multi language project. I am using 2 models to save data. Fields that are same for all languages (like images) in model 1 and texts in model 2 with ForeignKey to model 1.
...ANSWER
Answered 2021-Feb-08 at 09:22There is an easier solution for your case, I strongly recommend you to use Django Model Translation library. the cool thing about it is that it relies request's Accept-Language header, which will return your text based on the passed language code in the header, and if it is not there it will fallback to a default language code you set.
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