I'm trying to learn Actionscript 3. I need to shift my origin from the top left corner to the center of the stage. I found this question answered on stackoverflow :
How to change the coordinate origin in Flash's stage with Actionscript?
The suggestion is, "Create a MovieClip or Sprite and add that to the stage as your root object (instead of adding to the Stage) at stage.width/2, stage.height/2."
What does this mean? What is a root object? How do I add a MC as a root object to the stage?
When you launch a swf you are basically launching a MovieClip. (I'm probably going to get ripped a new one for this analogy). So when you write this
var myMC:MovieClip = new MovieClip();
addChild(myMC);
You are adding a MovieClip to your movies root/stage. Since it is not possible to truly alter the origin of the root/stage, that post is suggesting is that you do the next best thing. By creating another MovieClip and adding to your root/stage like this
var fauxRoot:MovieClip = new MovieClip();
fauxRoot.y = stage.stageHeight/2;
fauxRoot.x = stage.stageWidth/2;
addChild(fauxRoot);
Now that you have centered the fauxRoot MovieClip in your root/stage, you can add all your elements to the fauxRoot instead of your root/stage. Since the fauxRoot is centered in the main root/stage it's 0,0 will be in the center. An Example of adding a button might be
var uiButton:Button = new Button();
uiButton.x = uiButton.width/2;
uiButton.y = uiButton.height/2;
fauxRoot.addChild(uiButton);
The button should now be centered in the middle of your screen. Hope this helps a little.
Related
Basically I've got a bitmap which is an image that the user captures from a webcam which was previously stored as bitmapdata which I converted into a bitmap and added it onto the stage..
From here I want the bitmap to be selectable so I can do other things to it, so I realised I would need to add this into sprite in order to add event listeners onto it.
Having done so, for some reason my application ain't wanting to recognise the events added?
Here is the code I've got..
Bitmap..
//Create a new bitmap from the video capture
image = new Bitmap(bitmap,"auto",true);
//Set the width and height properties
image.width=150;
image.height=125;
//Set the stage position
image.x = 430;
image.y = 280;
stage.addChild(image);
Sprite..
var imageSprite:Sprite;
imageSprite = new Sprite();
imageSprite.x = 200;
imageSprite.y = 50;
imageSprite.addChild(image);
stage.addChild(imageSprite);
Event listener:
imageSprite.addEventListener(MouseEvent.MOUSE_DOWN, SelectWebImage1);
Function:
function SelectWebImage1(e:MouseEvent): void {
trace("Clicked");
}
I receive no errors from this but I noticed that when I have that code written in my application, all of the code underneath it doesn't seem to function?
I really don't know what i'm doing wrong, any help appreciated thanks!
When you set Sprite's dimensions, you implicitly set its scale, and also if you place some graphics by using width and height, the width and height includes any sprite's children, accounting for their position. You should place that bitmap into imageSprite and not set x,y proerties for the bitmap, this way you won't have to account for its position inside the sprite to position the bitmap.
I am really new to flash and AS3 so I do not even know how to ask this question properly.
I have a character (MovieClip) which has an animation, what I want to do is add an item to this character, for example in the "head" layer, and this item should follow the "head" layer.
Thus means the item should be slightly above head in each frame, and the head is constantly changing its position.
What I've got so far is a static item (never moves with the head layer), adding it with "addchildat" to my movieclip.
var running : anim_running = new anim_running (); // running movieclip
var cono : i_1 = new i_1 (); // cone head item
running.addChildAt (cono, 10); // adding the cone to the proper layer
cono.x = 20;
cono.y = -20; // positioning the cone on top of the head
with this piece of code this is what it looks like (I can not post images yet)
http://oi45.tinypic.com/2qx6bls.jpg - this is a frame where the cone is properly positioned
http://oi47.tinypic.com/34g6bub.jpg - but in the next frame the cone won't follow the head layer
Sorry if this is a really noob question. I searched all over google before asking.
Many thanks in advance!
Probably the simplest way to do this (with not too much tricky code), would be to create a "container" movieclip inside the head movieclip where you can add in new hat movieclips.
Then just add the hat to the container. Make sure you have your instance names set up so you can reference them in code. Here is an example:
running.head.hatContainer.addChild(cono);
Ok, so if I'm understanding this correctly you'd want to add a container movie clip that has both the head and the cone inside of it. Then you'll animate the container as opposed to the head. That way you can add items to the container relative to the other items as if it were static and the animation keeps playing.
Rough example:
var container:MovieClip = new MovieClip();
addChild(container);
container.addChild(head);
container.addChild(cone);
TweenLite.to(container, 3, {x:container.x + 50}); /*head and cone move relative to each other because their parent is being animated */
How to add Sprite to BorderContainer (UIComponent)?
var sprite:Sprite = new Sprite();
sprite.graphics.lineStyle(10,0);
sprite.graphics.moveTo(40,40);
sprite.graphics.lineTo(60,60);
mybordercontainer.addChild(sprite);
//mybrodercontainer is id of BorderContainer created in mxml
This code doesnt work. I cant see Sprite on my BorderContainer. How can I add Sprites on UIComponents, so I can see them? I tried this and it kinda worked:
var comp:UIComponent = new UIComponent();
comp.addChild(sprite);
myborderconteiner.addElement(comp);
But I dont think, that this is a right way to add Sprites to UIComponents. Is there another method to do that?
Second problem:
When I have few Sprites added to my UIComponent (lines/circles/images or others) how can I receive an object Sprite from that UIComponent, which is containing all Sprites added before to that UIComponent?
I need to create Bitmap from that Sprite and do some things.
I hope I make myself clear
Use the SpriteVisualElement as container. That should serve nicely as a container or Sprite substitute. You could also draw in the UIComponent itself.
i have a bunch of movieclips on the stage and some are nested into others, i would like to have 1 of them to be put on top of everything else on the stage when i start dragging it. Anyone know how to get a nested movieclip on top of parents etc?
You could have a top layer & a bottom layer , whenever you want to add a child on top of everything else, simply add the child to the top layer. This way you don't need to figure what the parent position is , just keep this layer on top for that specific purpose.
var topLayer:Sprite = new Sprite();
var bottomLayer:Sprite = new Sprite();
var childMc:MovieClip; // the mc you want to have on top
//somewhere in your code...
childMc.addEventListener(MouseEvent.MOUSE_DOWN , childMcMouseDownListener );
addChild( bottomLayer );
addChild( topLayer );
//add everything to the bottom layer
//leave the topLayer empty until you add the child mc
//add the following code in your MouseDown Listener
function childMcMouseDownListener(event:MouseEvent ):void
{
topLayer.addChild( event.currentTarget );
}
top of everything else on stage:
stage.addChild(target);
warning from AS3 doc :
The command stage.addChild() can cause problems with a published SWF
file, including security problems and conflicts with other loaded SWF
files. There is only one Stage within a Flash runtime instance, no
matter how many SWF files you load into the runtime. So, generally,
objects should not be added to the Stage, directly, at all. The only
object the Stage should contain is the root object. Create a
DisplayObjectContainer to contain all of the items on the display
list. Then, if necessary, add that DisplayObjectContainer instance to
the Stage.
Suppose, Container is your parent movieClip and it has many children then Now your target and currentTarget property depends on which object the listener is attached and how much you have nested your movieclips. in my case the Container is your parent movieClip having two or more children.
Container.addEventListener(MouseEvent.MOUSE_DOWN, pickUp);
public function pickUp(param1:MouseEvent) : void
{
var objectToDrag = param1.target;
Container.setChildIndex(param1.target,Container.numChildren-1);
objectToDrag.startDrag(true);
}
Pretty basic question here, but its still got me a little confused..
I have an object(navigation menu bar) that I want to change the colors on with code, so in an updateColor function, I get the bounds of the object (which is a drawing shape contained in a movieclip) and redraw a new shape on top of it with the new color, but I've noticed that the last shape still exists behind this redraw.
I tried using obj.graphics.clear(); before the redraw but that didn't get rid of the original shape. Is there another command that I'm overlooking?
Unless you drew the object you wish to remove within the same graphics object, clearing won't work. You need to remove the DisplayObject.
Depending on the number of children you can do:
obj.removeChildAt(0);
This also removes movieclips / buttons you placed on the stage manually.
If you have a reference to the DisplayObject you wish to remove you can simply do
obj.removeChild(backgroundClip);
Note that you can also change the color of a DisplayObject directly:
import flash.geom.ColorTransform;
...
public var test:MovieClip; //instance on stage
...
var cf:ColorTransform = test.transform.colorTransform;
cf.color = 0xff0000;
test.transform.colorTransform = cf;
while(this.numChildren)
{
this.removeChildAt(0);
}
Will clear child object on this MovieClip,
if it's clearing too much, then put the shape drawing in a subclip, and clear the subclip.