keycode | Keyboard input handling for games | Keyboard library
kandi X-RAY | keycode Summary
kandi X-RAY | keycode Summary
The main problem here is that we want to specify a keyboard layout using key names, e.g., WASD, but this breaks as soon as you switch keyboard layouts. If you think WASD is reasonable on a US keyboard, you want to use ZQSD on a French keyboard. The solution is to respond to key inputs according to the location of the key, not the label (character) of the key. Various input frameworks have botched this over the years. Developers often only use US layouts personally so test coverage is naturally poor. Reacting to keys by character codes causes problems more severe than a bad set of default layouts. For example, one commonly used guide to handling keyboard input on macOS would get confused by the shift key. For example, you could press “.” then, then press shift, and then release shift. The game will record the release of the “<” key instead, which is incorrect. SDL also has some severe problems when using different keyboard layouts, these have been fixed in 1.3. The fundamental position of keys on keyboards is universal if the keys produce different characters and scan codes under different conditions. Therefore we can come up with a naming system for keys that is universally portable, at least to platforms for which we have reverse engineered the key codes.
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QUESTION
I'm trying to use Matter.Query.region
to see if the character in my game is grounded. But, when I try to run region
with a bounds object that I created (displayed with the dots shown in the game), it doesn't come up with any collisions even though it is clearly intersecting other bodies.
Code:
...ANSWER
Answered 2022-Mar-24 at 00:20The bounds object doesn't appear to be properly created. The purple p5 vertices you're rendering may be giving you a false sense of confidence, since those aren't necessarily related to what MJS sees.
It's actually a pretty simple fix, passing an array of vertices instead of individual arguments:
QUESTION
this is my javascript which works for single input fields but I want it to work for multiple input.
here if I try to insert value for input class=adv more than fixed input value of class=full it won't allow
...ANSWER
Answered 2022-Mar-16 at 08:39The effective line:
QUESTION
I'm really struggling here and I can't get it right, not even knowing why.
I'm using p5.js
in WEBGL mode, I want to compute the position of on point rotated on the 3 axes around the origin in order to follow the translation and the rotation given to object through p5.js, translation and rotatation on X axis, Y axis and Z axis.
The fact is that drawing a sphere in 3d space, withing p5.js
, is obtained by translating and rotating, since the sphere is created at the center in the origin, and there is no internal model giving the 3d-coordinates.
After hours of wandering through some math too high for my knowledge, I understood that the rotation over 3-axis is not as simple as I thought, and I ended up using Quaternion.js. But I'm still not able to match the visual position of the sphere in the 3d world with the coordinates I have computed out of the original point on the 2d-plane (150, 0, [0]).
For example, here the sphere is rotated on 3 axis. At the beginning the coordinates are good (if I ignore the fact that Z is negated) but at certain point it gets completely out of sync. The computed position of the sphere seems to be completely unrelated:
It's really hours that I'm trying to solve this issue, with no result, what did I miss?
Here it follows my code:
...ANSWER
Answered 2022-Feb-26 at 22:25I've finally sorted out. I can't really understand why works this way but I didn't need quaternion at all, and my first intuition of using matrix multiplications to apply rotation on 3-axis was correct.
What I did miss in first instance (and made my life miserable) is that matrix multiplication is not commutative. This means that applying rotation on x, y and z-axis is not equivalent to apply same rotation angle on z, y and x.
The working solution has been achieved with 3 simple steps:
- Replace quaternion with matrix multiplications using vectors (method
#resize2
) - Rotating the drawing plane with Z-Y-X order
- Doing the math of rotation in X-Y-Z order
QUESTION
Does anyone know why transparency drawing on a Canvas works perfectly fine using drawImage(), but doesn't work at all with a PixelWriter? I initially thought it may have something to do with Blend or some other mode/setting on the canvas/context, but haven't had any luck with that yet.
I need per-pixel variable transparency, not a single transparency value for the entire draw operation. I'll be rendering a number of "layers" (similar to how GIMP layers work, with optional transparency per-pixel). An additional open question is whether I'm better off first drawing the FINAL intended output to a WritableImage and then just drawing to the Canvas, for performance reasons, but that seems to defeat the point of using a Canvas in the first place...
Below is an example which shows a partially transparent Color being first drawn to an Image and then to the Canvas, and directly to the Canvas with setColor(). The transparent area is the Image draw, the opaque area is the setColor part. How do we get setColor() to respect Color alpha transparency for each pixel?
...ANSWER
Answered 2022-Feb-21 at 20:51The GraphicsContext
begins with the default BlendMode
, and all forms of drawImage()
use the current mode. In contrast, PixelWriter
methods replace values, ignoring the BlendMode
.
The example below lets you experiment with the supported BlendMode
values to see the effect. Related examples are shown here and here.
QUESTION
I'm trying to make the background (only the search bar) to be a backdrop blur background without blurring the whole background image behind it.
I've tried webkit filter: blur
& filter: blur
, but they both blur the whole body and not just make the transparent background of the search bar blurred.
Note: I'm not using a background image in the code below because I'll embed this code in an iframe
, which the background before it will be an image.
EDIT: I have removed the domain name in the ORIGINAL code so it doesn't conflict in search results for that domain name. Thanks everyone for helping me fix this issue! You're amazing!
...ANSWER
Answered 2021-Dec-04 at 16:05Use CSS filter
on any page element. This may require you to duplicate the existing background into the #search-query
Div (so that there is an image present to be blurred, it then appears like a blur of the original image behind it) but also try it with no background as a test. It's been a while since I used it but you may find that the blur applies to everything behind it regardless.
QUESTION
How to move focus from Compose Button to Compose TextField
by using the arrow key?
When I have moved focus from Compose Button to Compose TextField
by using the arrow key(KeyEvent.KEYCODE_DPAD_UP
),
the focus moves twice for that key press. (when I use page-up-key)
I hope that the focus moves once for that key press.
Please see GIF animation for details
Is there a way to fix this?
(I use up-key and down-key in moving between TextFields
using moveFocus
method of focusManager
in onKeyEvent
)
ANSWER
Answered 2022-Jan-12 at 03:55After testing I see that onKeyEvent
will fired 2 times after press a key on Button
(1 for ACTION_DOWN
and 1 for ACTION_UP
). Maybe it cause the focus move twice when press a key.
Then I think you can handle focus on your Button
like
QUESTION
I have a searchbar that autofills the words, i want to make the autofilled words links. so i have a page called page2.html and i want it so that if i type locations it will autofill the word locations en when i click on the autofilled word it will direct me to my Page2.html.
If i go to my searchbar and type Locations i get nothing, if i type "<" i get the code. it doesnt make it a link.
This is my html/javascript, there is a code that targets the arry down at the bottom:
...ANSWER
Answered 2021-Dec-17 at 22:04You can create the suggestion items using document.createElement
.
Like this:
QUESTION
I am making a fake input box so I can apply a vintage style text cursor like cmd _
.
ANSWER
Answered 2021-Oct-24 at 17:28A simple solution would be to use a monospace font, where the width of all characters is the same. An example would be Courier New
.
Then you can just use:
QUESTION
So, When I press the arrow keys on the keyboard (left, right, up, down) the green hover color goes to the corresponding button.
What I want to do, is every time I press the "return" or "enter" key (keycode 13), to write the corresponding number on the screen.
For example, if the green hover color is 2 and I prees the "Return/Enter" key, write "Two" on the screen. I want the same thing to happen with the mouse. For example, if I click on 2 , write "Two" on the screen.
How can I achieve this? And of course a better coding in all of this is always welcome.. Thanks a lot!!!
...ANSWER
Answered 2021-Oct-24 at 01:13For arrow keys:
Since you have the columns
and rowButtons
variables, you can calculate what number you are currently hovering over. Each row constitutes moving three columns over. So if we had rowButtons = 1
then are column position would be at 4 (which is the start of the second row). Therefore, if we want to know how numbers we move over, we can do rowButtons * 3
to calculate that portion. This then leaves columns: each time columns
goes up by 1, the number also moves up by one (number being the position on our keypad). So we can add columns
onto rowButtons * 3
to get the number value, but since columns
is zero-based (the column that starts with 1 means columns = 0
) we need to add one to get the precise value, so we get:
QUESTION
So, When I press the button1 "1 PLAY / STOP", the button turns green and when I press it again it removes the color. If I press the button2 "2 PLAY / STOP" the same thing happens.
If one of the two buttons plays and I press the other, it removes the color of one and goes to the other.
I want to do the same with the Z button (button 1) and X (button 2). For example, when I press the Z button (keycode 90) or the X button (keycode 88) to do what it does with the mouse.
And if there is better coding in all this it would be very useful because it is more than 20 buttons... Thanks a lot!!!
...ANSWER
Answered 2021-Oct-23 at 11:55You can use new Audio() to create and manipulate easily your audio element.
The Audio() constructor creates and returns a new HTMLAudioElement which can be either attached to a document for the user to interact with and/or listen to, or can be used offscreen to manage and play audio.
Then use data attributes tu store your audio src in each button.
HTML5 is designed with extensibility in mind for data that should be associated with a particular element but need not have any defined meaning. data-* attributes allow us to store extra information on standard, semantic HTML elements without other hacks such as non-standard attributes, or extra properties on DOM.
So when you click on button, his data-audio-src
value append to your previously created audio element.
I put button into div wich is set to active when a child button is clicked so when you press X
or Z
it "detect" wich one is playing then switch the good button.
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