Re: [Flashcoders] Maintain position on rotation

2008-06-19 Thread jonathan howe 
Eric,

In your comment you mentioned localToGlobal wasn't updating. Just in case:
one misttep that I made when first working with AS3 was that localToGlobal
no longer modifies the point you pass it. You have to evaluate the return
value i.e.

changedPoint = someDisplayObject.localToGlobal(originalPoint);

changedPoint not originalPoint.

-jonathan


On Wed, Jun 18, 2008 at 8:34 PM, eric e. dolecki [EMAIL PROTECTED] wrote:

 Hey guys,

 Before I saw these response posts, I took a slightly different angle on
 things. When I create my limbs, I am actually adding another limb to a
 joint
 sprite on the end of the main limb. That way it simply moves with the upper
 limb, and can still rotate freely on its own, using some rotational rules.
 It avoids a bunch of math and allows the nesting to simply take care of
 some
 of it.

 When I tried points and localToGlobal, it still gave me weird results,
 making me take the route above.

 Thanks for the responses, it's why this list is the best in the world.

 - e.

 On Wed, Jun 18, 2008 at 2:16 PM, Jon Bradley [EMAIL PROTECTED]
 wrote:

 
  On Jun 18, 2008, at 1:27 PM, eric e. dolecki wrote:
 
   While rotating, I want to place another MC's x,y (each frame) on that
  rotating MC. However the x,y never updates. I tried localToGlobal, but
  that
  doesn't seem to change either during the rotation. Can this be easily
  done?
 
 
 
  Give something like this a shot. Note that this is completely untested
  because I wrote it right here ... this is the general idea though.
 
  var m:Matrix = mainMC.transform.matrix;
  var pt:Point = new Point( mainMC.theChild.x, mainMC.theChild.y);
 
  var position:Point = m.transformPoint(pt);
 
  // You might need to add in the tx,ty offsets
  var matchMoveClipX:Number = position.x + m.tx;
  var matchMoveClipY:Number = position.y + m.ty;
 
  That assumes, of course, that you're applying your transformations using
  matrices.
 
  If you use dot notation on the properties (rotate, scale, x y), I'm not
  100% certain that those properties are updated in the transformation
 matrix
  of the object.
 
  good luck.
 
  jon
 
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-- 
-jonathan howe :: 404.434.2321 :: 180 High St Apt 26 Portland, ME 04101
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[Flashcoders] Maintain position on rotation

2008-06-18 Thread eric e. dolecki 
AS3. I have a MC I am rotating, and inside the MC I have a Sprite (affixed
to the bottom of the MC).

While rotating, I want to place another MC's x,y (each frame) on that
rotating MC. However the x,y never updates. I tried localToGlobal, but that
doesn't seem to change either during the rotation. Can this be easily done?
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Re: [Flashcoders] Maintain position on rotation

2008-06-18 Thread Rob Romanek 

Hi Eric,

Try out this code, should do the trick and show that localToGlobal  
does work

Run it once as is, then uncomment the rotation and see the results.

hth,

Rob



var sprite1:Sprite = new Sprite();
sprite1.graphics.beginFill(0x00ff00);
sprite1.graphics.drawRect(0,0,100,100);
sprite1.graphics.endFill();

var sprite2:Sprite = new Sprite();
sprite2.graphics.beginFill(0xff);
sprite2.graphics.drawRect(0,0,10,10);
sprite2.graphics.endFill();

sprite1.addChild(sprite2);
sprite2.x = 90;
sprite2.y = 90;

addChild(sprite1);
sprite1.x=100;
sprite1.y=100;

//sprite1.rotation = 45;

trace(sprite1.localToGlobal(new Point(sprite2.x, sprite2.y)));


On 18-Jun-08, at 1:27 PM, eric e. dolecki wrote:

AS3. I have a MC I am rotating, and inside the MC I have a Sprite  
(affixed

to the bottom of the MC).

While rotating, I want to place another MC's x,y (each frame) on that
rotating MC. However the x,y never updates. I tried localToGlobal,  
but that
doesn't seem to change either during the rotation. Can this be  
easily done?

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Re: [Flashcoders] Maintain position on rotation

2008-06-18 Thread Rich Shupe 
Theoretically, I'm not sure why not. Can you describe how/where they should
overlap or post some code?


On 6/18/08 1:27 PM, eric e. dolecki  wrote:

 AS3. I have a MC I am rotating, and inside the MC I have a Sprite (affixed
 to the bottom of the MC).
 
 While rotating, I want to place another MC's x,y (each frame) on that
 rotating MC. However the x,y never updates. I tried localToGlobal, but that
 doesn't seem to change either during the rotation. Can this be easily done?

Rich
http://www.LearningActionScript3.com


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Re: [Flashcoders] Maintain position on rotation

2008-06-18 Thread Jon Bradley 


On Jun 18, 2008, at 1:27 PM, eric e. dolecki wrote:


While rotating, I want to place another MC's x,y (each frame) on that
rotating MC. However the x,y never updates. I tried localToGlobal,  
but that
doesn't seem to change either during the rotation. Can this be  
easily done?



Give something like this a shot. Note that this is completely  
untested because I wrote it right here ... this is the general idea  
though.


var m:Matrix = mainMC.transform.matrix;
var pt:Point = new Point( mainMC.theChild.x, mainMC.theChild.y);

var position:Point = m.transformPoint(pt);

// You might need to add in the tx,ty offsets
var matchMoveClipX:Number = position.x + m.tx;
var matchMoveClipY:Number = position.y + m.ty;

That assumes, of course, that you're applying your transformations  
using matrices.


If you use dot notation on the properties (rotate, scale, x y), I'm  
not 100% certain that those properties are updated in the  
transformation matrix of the object.


good luck.

jon
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Re: [Flashcoders] Maintain position on rotation

2008-06-18 Thread eric e. dolecki 
Hey guys,

Before I saw these response posts, I took a slightly different angle on
things. When I create my limbs, I am actually adding another limb to a joint
sprite on the end of the main limb. That way it simply moves with the upper
limb, and can still rotate freely on its own, using some rotational rules.
It avoids a bunch of math and allows the nesting to simply take care of some
of it.

When I tried points and localToGlobal, it still gave me weird results,
making me take the route above.

Thanks for the responses, it's why this list is the best in the world.

- e.

On Wed, Jun 18, 2008 at 2:16 PM, Jon Bradley [EMAIL PROTECTED]
wrote:


 On Jun 18, 2008, at 1:27 PM, eric e. dolecki wrote:

  While rotating, I want to place another MC's x,y (each frame) on that
 rotating MC. However the x,y never updates. I tried localToGlobal, but
 that
 doesn't seem to change either during the rotation. Can this be easily
 done?



 Give something like this a shot. Note that this is completely untested
 because I wrote it right here ... this is the general idea though.

 var m:Matrix = mainMC.transform.matrix;
 var pt:Point = new Point( mainMC.theChild.x, mainMC.theChild.y);

 var position:Point = m.transformPoint(pt);

 // You might need to add in the tx,ty offsets
 var matchMoveClipX:Number = position.x + m.tx;
 var matchMoveClipY:Number = position.y + m.ty;

 That assumes, of course, that you're applying your transformations using
 matrices.

 If you use dot notation on the properties (rotate, scale, x y), I'm not
 100% certain that those properties are updated in the transformation matrix
 of the object.

 good luck.

 jon

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