I am trying to write a code where balls are dropped and as soon as they get below half of the screen they get removed, so that nodes don't keep pilling up.
As the balls are generated, they are being added to a nodes array "balls", then I am removing them as needed with a for loop.
The interesting part is that as long as I do not have any other action in the loop, nodes are being removed properly. However when I add the flyPoints, nodes just keep on pilling up and and no longer get removed, no error though. Does anyone know why? At the same time I need to keep the fly points function in the for loop and remove the nodes.
Thanks
for ball in balls {
if ball.Ball.position.y < self.frame.height/2 {
flyPoints(location: ball.position(), points: "+1", view: self)
ball.Ball.removeFromParent()
balls.removeFirst()
}
}
Related
I have a list of anything from 10-500 records appearing on screen as a graphical array using standard NG-REPEAT, visualisation is a row of photographs
What I would like to achieve, but cant quite get my head around if its even possible is this...
A 'window' on screen that will only show 10 records - Done
You can scroll left or right through the entire list - Done
HOWEVER
What i would LIKE to achieve is that when the end of the list is reached, the list starts again from the beginning but in an infinite style loop. Both directions
I have never done anything like this and not quite sure how I would achieve this of my ng-repeat (item in ListofItems)
So I assume that the best solution is
when the user gets 40 records through 100 records, i push() the first 20 records from my $scope.ListofItems to the end of the array, and remove the equivalent first 20 records from the front.. this keeps a constant list of 100 records, no massive memory usage.. i can even do this on an individual record basis.. remove one record from end or beginning and add at the beginning or end of the list.
The user experience is an infinite scroll, but I suspect the browser experience could be slow and stuttering due to the processing going on
Push(), Pull(), Tracking and indexing would play a part but any suggestions would be appreciated whether this is even technically possible
EDIT : After some research. maybe
$scope.ListofItems.push($scope.ListofItems.shift());
could be a solution to move beginning to end, but not sure how to trigger this or go the other way (pull?)
EDIT2 : Just did a manually called function for the above and it shifts front item to end of list, though i would have no clue how to read the screen position to know when to fire the function
Going the other way around could be
$scope.ListofItems.unshift($scope.ListofItems.pop());
As a side note, I think it's important to keep in mind for large arrays that shift() and unshift() naturally cause a full reindexing and have a time complexity of O(n) where n is the length of the array, as opposed to push() and pop() which have a time complexity of O(1)
Here's my dilemma
I have 4 walls around the stage of my game, when a player hits these walls I do not want to make an if statement for each and every one of the walls checking if the player is hitting it, so I have created an array to hold the walls, then check if the player is hitting that. Now, because I am doing this I will not know what the player is actually hitting if he hits something, and I cannot do a check in my array if he's hitting like [0], [1], [2] etc because then I'm back to doing the checks if he's hitting specific walls. The reason I don't want to do that is for the future, when I add more barriers, buildings, and so on.
So my question is, how can I do collision checks, without hard coding checks on specific objects, and giving some sort of value that can be used for the player to respond to, for example if your hitting the top wall and you can figure that out somehow without doing the above, then make it so you can't walk through or something,
if (main.playerPosKeeper_mc.hitTestObject(this[main.StageCollisions]))
{
trace("hit");
}
StageCollisions is an array which contains all of my barriers in it.
When the player hits anything in StageCollisions, I cannot just simply subtract from his y value, or x value, because I do not know which object he hit, but I also do not want to hard code it so that I check if I'm hitting lets say the top barrier, because then why do an array in the first place if I'm just going back to making static if else statements.
^^ Refrencing this topic
AS3 - How to Cycle States of Character Animations (moving & stopped)
This has been stumping me for a little while, so help would be greatly appreciated. It is a hard question to form so I can clarify points if necessary.
So my question is, how can I do collision checks, without hard coding
checks on specific objects, and giving some sort of value that can be
used for the player to respond to, for example if your hitting the top
wall and you can figure that out somehow without doing the above, then
make it so you can't walk through or something
Right, so you want a way to perform a generic collision response. This can be a big topic. The simplest approach is usually to check for a collision after a move, then reverse the move if there's a collision.
Something like this:
function movePlayer(movementX:Number, movementY:Number):void {
var originalX:Number = player.x;
var originalY:Number = player.y;
player.x += movementX;
if (checkCollision()) {
player.x = originalX;
}
player.y += movementY;
if (checkCollision()) {
player.y = originalY;
}
}
function checkCollision():Boolean {
for each (var wall:MovieClip in walls) {
if (player.hitTestObject(wall)) {
return true;
}
}
return false;
}
This way you could have checkCollision() check 4 walls or 50 walls, it doesn't matter. It won't let the player move into them.
This is just a starting point and there are many ways it can break down or be refined.
Some trivial pseudo code for you to study:
private function collisionCheck(h:Sprite):Sprite{ // pass the hero Sprite into this function and it will return the wall that it hit
for each (b:Sprite in blockArray){ // if your array of hit-able objects is called "blockArray"
if (h.hitTtestObject(b)){ // check the hero Sprite against all objects in the array
return b;
}
}
return null;
}
Then, elsewhere in your code (maybe in your gameTick function or gameLoop function or wherever you have your game logic repeating on each frame:
private function gameTick():void{
var objectHit:Sprite = collisionCheck(_myHero); // this will run the collision check function, and return the sprite that the hero collides with;
if (objectHit != null){
objectHit.alpha = 0.5;
// this will give you a visible representation that your code is indeed working, or not.
}
}
For those moments when your hero isn't colliding with anything, this function will return null. That's why I first check if objectHit is not null before trying to perform an operation on its alpha value. Of course, you will do something other than change its alpha value in your project, but this is something I often do (with the alpha) to quickly get a visual confirmation that things are detecting what they are supposed to.
I have a page full of mc_card's and want the user to choose which ones to add to their deck.
click a card and cardChosen = true for that card;
click again and cardChosen = false;
This works fine.
Upon choosing a card the frame number is stored in an array. Each card is on a separate frame and there are no duplicates.
Main.cardArray.push(this.currentFrame);
Upon clicking it again, I want to remove that frame number from the array:
Main.cardArray.splice(this.currentFrame, 1);
After I splice the array, I trace it, and I'm getting weird results. Sometimes it works like I would expect, but then it removes the wrong numbers and sometimes doesnt remove them at all.
splice() works in another way, that you try to use.
Here is statement:
splice(startIndex:int, deleteCount:uint, ... values):Array
So, first arg - start index in array to delete, and second arg - how much elements must be deleted from the start index.
I've ran into a weird problem with flash, I have an array of 92 buttons, at first it was all contained in a single array, the buttons up to the first 20th buttons work, the rest don't.
The buttons will take the user to the next scene basically.
So I tried to breakup the array into multiple arrays, so the first array contains the first 20, the second array the 21-40th and so on, the fifth array contains the 81-92 buttons.
The problem now is I will get this error message:
TypeError #1010: A term is undefined and has no properties
and it'll break all the buttons, rendering all the buttons unusable.
Therefore, I commented out the
for (var a=0; a<buttons.length; a++)
{
firstarray[a].addEventListener(MouseEvent.CLICK,ArraySelectOne);
secondarray[a].addEventListener(MouseEvent.CLICK,ArraySelectOne);
thirdarray[a].addEventListener(MouseEvent.CLICK,ArraySelectOne);
fourtharray[a].addEventListener(MouseEvent.CLICK,ArraySelectOne);
//fiftharray[a].addEventListener(MouseEvent.CLICK,ArraySelectOne);
}
in my button spawn function and the buttons from the first to fourth array works flawlessly well except the fifth, which when clicked, nothing happens.
So I tired to create a new function whereby it was only the fiftharray in it and called the new function in the spawner, same error, breaks everything.
Then I thought was there a button naming issue whereby i mistyped something, I took the button names in the fifth array and pasted them into the start of the fourtharray, replacing what was in it plus commenting out the fiftharray from my script.
The once unworkable buttons (81 to 92) worked, but now (61 to 80) didn't.
I tried combining all the arrays using the comarray, but only the first 20 buttons worked.
So I am wondering if is there a fix or something to solve this problem, much help is appreciated!
There is no need to have multiple arrays, remove them. The last array is obviously shorter than the rest and that's messing up your code -> you are pointing to an index that doesn't exist in your last array.
There is actually no need to have an array. You have 92 buttons, that's a nice bunch. Why not to put it to a movieclip instead? What's the need of the array?
Let's assume you select all your buttons and put them inside of movieclip called buttonsClip. Now you can just use this code, without typing all the instance names out to put them to the array (like the tutorial did it... that may work for 8 buttons, but 92... come on :) ):
import flash.display.MovieClip;
import flash.events.MouseEvent;
for(var i:uint=0; i<buttonsClip.numChildren; i++) {
var b:MovieClip = buttonsClip.getChildAt(i) as MovieClip; //Assuming the buttons are movieclips
b.addEventListener(MouseEvent.CLICK, onClick);
}
function onClick(e:MouseEvent):void {
trace(e.target.name);
}
I know this Question is currently 8 years old, but maybe this will help another person that is searching for the same thing.
I had pretty much the same problem and in my case it was just that I accidently skipped a number while naming all the Symbols in the libary that I wanted to be in this array. I had 42 Symbols but because of this mistake the function to load the array had 43 and obviously the program was confused about that.
I realise the description is a bit vague, I couldn't explain the issue without showing the code!
Basically I have made a game in AS3 which incorporates a character moving around a platform style level collecting items. The items are all seperate movieclips of the same instance (vinyl1a).
References to each item in the level are stored in an array as shown:
vinylArray=[mapbg.misc.vinyl1, mapbg.misc.vinyl2, mapbg.misc.vinyl3, mapbg.misc.vinyl4,...]
The actual array goes up to 40 items. Collision detection is done through a for loop as shown here:
var i:int;
for (i=0; i < maxVinyl; i++){ //iterate from 0 to maximum amount of vinyl
if (woody.hitTestObject(vinylArray[i])) { //checks if woody collides with vinyl
if (vinylArray[i].visible == true) { //checks if the vinyl has already been taken
vinylArray[i].visible = false; //removes vinyl from map
vinylCollected++; //adds to score
updateScore();
}
}
}
In this scenario 'woody' is the character. Now, the issue is, I have had it working perfectly fine for up to 10 'vinyl' items, which covers the first 3 levels of the game. Now I have progressed into the 4th level and I have added more 'vinyl' movieclips to the map (the array has always had 40 values but the for loop only iterates up to 'maxVinyl' which is set for each individual level) and for some reason the collision detection just isn't working.
There are no error messages, and the first 10 movieclips are still detected correctly, but 11 onwards isn't.
Any help would be greatly appreciated - and if you need more information on the problem please ask!
Cheers
EDIT: Forgot to mention, I tested more than 10 vinyl on the first level and the detection works - the situation is that all of the vinyl movieclips are stored in seperate key frames for each level, within a movieclip called misc. So I can do 10+ on the first level but that seems to be it..
I would imagine what is happening is that maxVinyl is not set to the correctly length of the array.
A simple :
maxVinyl = vinylArray.length;
BEFORE the for loop should ensure that all objects in that array are hitTest as desired.
Based on some of the comments, it sounds like there are some other issues with your approach that might be the larger issue.