change Registrationpoint of drawn Bitmap

[Megaloadon]

Hello Community,

I want to tween Movieclips from off-Stage to a random coordinate on-Stage. They should not touch!

I need a way to "reserve" a space on my stage for a movieclip, that isn't on that position yet. I roll random coordinates for positions of my mc with a timer and I cant use a "normal" colission tests, because the Movieclips are slowly tweened to that position and during the tween the later position can get grabbed away by a new movieclip.

I tried to write a function where a Bitmap (later set to invisible) with the exact shape and size of a movieclip spawns at the random point as a placeholder for collisiontest. I want to check if the Bitmap has any collisions with other objects and if not, tween my movieclip on the bitmaps position. (otherways reroll for a new coordinate)

when drawing the bitmapData in a Bitmap, my registrationpoint changes form center to top-left to draw the bitmap completely. I need it in center to make the bitmap the same position like the movieclip.

how can i change the registrationpoint?

function drawBitmap(fly:Fly):void{

  var bounds:Rectangle = fly.getBounds(this); // gets Bounds of Fly in a Rectangle

  var flyBmpData = new BitmapData(bounds.width,bounds.height)

  var flyOffset:Matrix = fly.transform.matrix;

  flyOffset.tx = fly.x - bounds.x;

  flyOffset.ty = fly.y - bounds.y;

  flyBmpData.draw(fly,flyOffset);

  var flyBmp = new Bitmap(flyBmpData);

  flyBmp.x = stage.stageWidth/2;

  flyBmp.y = stage.stageHeight/2;

  addChild(flyBmp);

  }

is there a simpler way to make the Movieclips not overlappig on stage than using a bitmap as placeholder? Maybe only using the bitmapData...?

Thanks!

Megaloadon

[dmennenoh]

You might try something like using different sections of the stage - like divide it into 8 sections and then grab a random point within that area.

As for changing the reg point of a bitmap - just place it into a sprite. If your bitmap is 100x100 stick it in a sprite and set it to -50,-50 and then move the sprite.

[Megaloadon]

dmennenoh​

Ah.. that sounds helpful! So I put it in another ObjectContainer and instead of change the registrationpoint i change the position in the container..

I have not much experience with creating ObjectContainer in AS3, because I usualy do all the MovieClips etc. in Flash. Can you give me a snippet with your sprite solution pls? is it something like: mySprite.addChild(flyBmp) ?

Anyways there might be a way to actually change the registrationPoint back with the Matrix i used in my function. I just dont know how.

I save all the fly Objects in an Array with an ID, so I can identify and delete them by clicking. It would be perfect if i can link the Bitmap to the flyObject to delete them together. maybe thats also possible by putting it into a sprite and maybe than into the object fly? Any Ideas? Thanks for the quick response

Megaloadon

[dmennenoh · Accepted solution]

To make a sprite and put your Bitmap in it, yes you do just like you thought:

var mySprite:Sprite = new Sprite();

mySprite.addChild(flyBMP);

Sprites are just like MovieClips, just a bit lighter as they have no frames. Good for general containers. I routinely use Sprites as layers in my projects - I will have a main layer, a "top" layer, etc... you can then easily remove all objects in a layer etc.

Anyway, to delete them together you would just remove the Sprite and then remove any child with it.

[Megaloadon]

dmennenoh​

That will solve it... Thank You!

So to delete them at once i would have to put the fly and my bitmap in one MC or Sprite. Can I then still move them indpendend and with old registrationpoints etc? Otherways i would need a way to put them together in an Object and push that into my array.

What would be better?