raf | A ticker implementation using only one requestAnimationFrame | Frontend Framework library
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A ticker implementation using only one requestAnimationFrame
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QUESTION
I want to make my requestAnimationFrame run 60FPS regardless of monitors refresh rate so the game would run at the same speed on every monitor.
Although it seems to work, when I try using chrome DevTools performance tab I can see the FPS being like -> 48, 72, 48, 72....
Here is my throttled version of rAF
...ANSWER
Answered 2022-Apr-05 at 10:59The TL;DR is, requestAnimationFrame()
runs whenever it feels like. You can't really throttle it. If you want to try to do that, you should use setTimeout()
or setInternal()
instead. They'll be called closer to your throttled rate, usually +/- 4ms.
Or you can do what you're doing, which is throttle when you take action, if you want. You'll see in DevTools whatever requestAnimationFrame()
is being called at, but your function would only do the move()
at 60FPS, or whatever rate best lines up with it. Though, this can create some clunkiness, since you may end up with much slower effective FPSthan what you want, if the intervals between each call by requestAnimationFrame()
don't line up well with your target FPS.
Usually a better approach is instead scale all of your changes, such as movement, by the delta of your time since the last call:
QUESTION
I have a javascript code that needs a bit of tweening so it will work correct.
QUESTION 1 The spinning starts by SPACEBAR press. But i also want it to stop spinning when i press PRESSBAR. How can i do that?
QUESTION 2 Is there a way to make the "spinning wheel" bigger in size?
The original source code comes from: https://jsfiddle.net/lannymcnie/ych1qt8u/
...ANSWER
Answered 2022-Mar-21 at 10:06add another event handler , and for bigger size change the var size
which is set to 250 in ur example .
QUESTION
im downloading a pdf file in this address :
...ANSWER
Answered 2022-Mar-06 at 10:42For anyone who still wonders how i fixed the issue, i used path provider to save the file in the cache and then after saving the file then i moved the file to downloads folder with the flutter_file_dialog package
source code :
QUESTION
I want to stop this requestAnimationFrame
after 1 second:
ANSWER
Answered 2022-Feb-26 at 16:49The difference is the moment in time at which rAF
is evaluated.
Presumably, your code looks something like this:
QUESTION
State changes affect other React-Pixi Stage props, such as height or width. But, when I attempt to change the Stack options.backgroundColor, the backgroundColor does not change on state change.
Here's my code:
...ANSWER
Answered 2022-Feb-22 at 18:24I got an answer in the github issues: github.com/inlet/react-pixi/issues/325#issuecomment-1047944615
QUESTION
Let's say I have rAF scheduled inside another rAF.
Component 1:
...ANSWER
Answered 2022-Feb-18 at 01:41At the next repaint cycle.
Think of requestAnimationFrame
as setTimeout(cb, time_until_next_monitor_refresh)
.
Before your callback is called, at the next monitor refresh, this time_until_next_monitor_refresh
will be reset again to be a full frame-duration, so there is no way that an animation frame callback scheduled from another animation frame callback fires in the same painting frame*.
Note that that's how the basic requestAnimationFrame loops work anyway, they schedule a callback which will itself schedule a new callback. That this scheduling is done from an other function doesn't change a thing (as long as it's all sync in the callback).
*Well, browsers do have bugs...
QUESTION
I'm currently having difficulties at visualizing Fourier series. I tried the same thing about three times in order to find errors but in vain.
Now I even don't know what is wrong with my code or understanding of Fourier series.
What I'm trying to make is a thing like shown in the following Youtube video: https://youtu.be/r6sGWTCMz2k
I think I know what is Fourier series a bit. I can prove this by showing my previous works:
(1) square wave approximation
(2) parameter
So now I would like to draw more complicated thing in a parametric way. Please let me show the process I've walked.
① From svg path, get coordinates. For example,
...ANSWER
Answered 2022-Feb-14 at 19:09Hello myself!
First, errors in your code...
You did not consider a case where sequence of values come after drawing command. For example, your
get_points
function can't handle a case likeh 0 1 2
.Current
get_points
function can't handle secondm
drawing command. You need to manually join strings if you have multiple paths.You need to manually set m x y to m 0 0. Otherwise you can't see canvas drawing. (Maybe values are too too small to draw)
Second, in brief, you can't draw a shape with rotating vectors having fixed magnitude, if you approximate f(t) in a xy plane. It's because what you approximated is not a shape itself, but shape's coordinates.
Third, the reason you got weird shape when you tried to plot approximated data is at your approxFn()
function.
QUESTION
I have this dataframe in python df
ANSWER
Answered 2022-Jan-11 at 23:57something like this :
QUESTION
I am working on instantiating and using log4J2 RollingFileAppender programmatically but unable to create an instance of a RollingFileAppender the call to build() method returns a null leading to a NullPointerException. Any idea on what is missing?
...ANSWER
Answered 2022-Jan-11 at 04:07While debugging your configuration method, you should read the messages from the status logger. Even better, set its level to DEBUG
(you can use -Dlog4j2.debug=true
).
You forgot to provide a name for your appender, hence the null
:
QUESTION
I'm trying to convert the output of this code into a dataframe. The code takes a tab-separated txt file from AWS S3 and turns it into a csv
...ANSWER
Answered 2022-Jan-07 at 03:02After set "txt" variable with s3 bucket contents, do this to load to dataframe:
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