RE: [Flashcoders] simple math question...
An easy way to do this is to build your movieClip so that the graphics inside align in the upper left corner at (0, 0). Then take the width of your movie and divide it in half. If you take this half-width value and subtract it from your _xmouse then it should center your movieClip over the mouse horizontally. Do the same for the half the height of your movieClip subtracted from the _ymouse and your movieClip should be centered vertically. Here is the equation, but you'll need to fiddle with the code a bit. mc._x = _xmouse - (mc._width/2); mc._y = _ymouse - (mc._height/2); Good Luck. Becky -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [p e r c e p t i c o n] Sent: Thursday, March 01, 2007 6:57 PM To: flashcoders Subject: [Flashcoders] simple math question... good people, how do i move a moviClip to center itself at (_xmouse, _ymouse)...i have the onPress part down...i just need to center it on those coordinates thanks ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
On 3/2/07, JOR <[EMAIL PROTECTED]> wrote: sweet tip, thanks. -- JOR No prob. Incidentally, I'm pretty sure this is why BlurFilter, etc. are optimized for blur amounts that are powers of 2. -- Mike Keesey ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
sweet tip, thanks. -- JOR T. Michael Keesey wrote: On 3/2/07, Karina Steffens <[EMAIL PROTECTED]> wrote: If your mc's reg point is top left: mc._x = _root.xmouse - mc._width/2 mc._y = _root.ymouse - mc._height/2 Incidentally, there's a neat trick you can do to speed up the calculation AND ensure that the result is an integer (so that the clip is aligned to the pixel). It's called "bitwise shift right": mc._x = _root.xmouse - (mc._width >> 1); mc._y = _root.ymouse - (mc._height >> 1); The benefit in speed is probably negligible in this case. In a test where I ran a calculation a million times, shift right was about 200ms faster than division. (I wonder if the difference might be greater in AS3, though) However, if you also have to constrain to an integer (e.g., using Math.floor()), then shift right is over twice as fast as using Math.floor and division. Basically, whenever multiplying or dividing by a power of 2, you can use shift left (for multiplication) or shift right (for division) and get a faster result that is automatically constrained to an integer. x >> 1 is equivalent to Math.floor(x / 2) x >> 2 is equivalent to Math.floor(x / 4) x >> 3 is equivalent to Math.floor(x / 8) x >> 4 is equivalent to Math.floor(x / 16) x << 1 is equivalent to Math.floor(x * 2) x << 2 is equivalent to Math.floor(x * 4) x << 3 is equivalent to Math.floor(x * 8) x << 4 is equivalent to Math.floor(x * 16) You get the idea ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
thanks for the info...very helpful!
cheers
[p]
On 3/2/07, Joshua Sera <[EMAIL PROTECTED]> wrote:
For an arbitrary registration point, use
var b:Object = mc.getBounds(mc._parent);
var offset:Object = {x:(mc._x - b.xMin, y:instance._y
- b.yMin)};
then
mc._x = (_root.xmouse - mc._width/2) - offset.x;
mc._y = (_root.ymouse - mc._height/2) - offset.y;
--- Karina Steffens <[EMAIL PROTECTED]> wrote:
> If your mc's reg point is top left:
> mc._x = _root.xmouse - mc._width/2
> mc._y = _root.ymouse - mc._height/2
>
> if it's centered you need not bother about the
> width/2 etc, but if it's
> somewhere else, you'll need to change it or do other
> calcualtions.
>
> Karina
>
> > -Original Message-
> > From: [p e r c e p t i c o n]
> [mailto:[EMAIL PROTECTED]
> > Sent: 01 March 2007 23:57
> > To: flashcoders
> > Subject: [Flashcoders] simple math question...
> >
> > good people,
> >
> > how do i move a moviClip to center itself at
> (_xmouse,
> > _ymouse)...i have the onPress part down...i just
> need to
> > center it on those coordinates
> >
> > thanks
> > ___
> > Flashcoders@chattyfig.figleaf.com
> > To change your subscription options or search the
> archive:
> >
>
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
> >
> > Brought to you by Fig Leaf Software
> > Premier Authorized Adobe Consulting and Training
> > http://www.figleaf.com http://training.figleaf.com
> >
>
> ___
> Flashcoders@chattyfig.figleaf.com
> To change your subscription options or search the
> archive:
>
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
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> http://training.figleaf.com
>
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Re: [Flashcoders] simple math question...
It depends where the registration point of your clip is. If it's at top-left or centre, then the calculation is simple - see all the other posts in the thread. If it's unpredictable, use getBounds() - do something like this: var bounds:Object=myClipToCentre.getBounds(this); myClipToCentre._x=_xmouse+(bounds.xMin+bounds.xMax)/2; myClipToCentre._y=_ymouse+(bounds.yMin+bounds.yMax)/2; HTH, Ian On 3/1/07, [p e r c e p t i c o n] <[EMAIL PROTECTED]> wrote: good people, how do i move a moviClip to center itself at (_xmouse, _ymouse)...i have the onPress part down...i just need to center it on those coordinates ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
RE: [Flashcoders] simple math question...
For an arbitrary registration point, use
var b:Object = mc.getBounds(mc._parent);
var offset:Object = {x:(mc._x - b.xMin, y:instance._y
- b.yMin)};
then
mc._x = (_root.xmouse - mc._width/2) - offset.x;
mc._y = (_root.ymouse - mc._height/2) - offset.y;
--- Karina Steffens <[EMAIL PROTECTED]> wrote:
> If your mc's reg point is top left:
> mc._x = _root.xmouse - mc._width/2
> mc._y = _root.ymouse - mc._height/2
>
> if it's centered you need not bother about the
> width/2 etc, but if it's
> somewhere else, you'll need to change it or do other
> calcualtions.
>
> Karina
>
> > -Original Message-
> > From: [p e r c e p t i c o n]
> [mailto:[EMAIL PROTECTED]
> > Sent: 01 March 2007 23:57
> > To: flashcoders
> > Subject: [Flashcoders] simple math question...
> >
> > good people,
> >
> > how do i move a moviClip to center itself at
> (_xmouse,
> > _ymouse)...i have the onPress part down...i just
> need to
> > center it on those coordinates
> >
> > thanks
> > ___
> > Flashcoders@chattyfig.figleaf.com
> > To change your subscription options or search the
> archive:
> >
>
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
> >
> > Brought to you by Fig Leaf Software
> > Premier Authorized Adobe Consulting and Training
> > http://www.figleaf.com http://training.figleaf.com
> >
>
> ___
> Flashcoders@chattyfig.figleaf.com
> To change your subscription options or search the
> archive:
>
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
> Brought to you by Fig Leaf Software
> Premier Authorized Adobe Consulting and Training
> http://www.figleaf.com
> http://training.figleaf.com
>
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Re: [Flashcoders] simple math question...
On 3/2/07, T. Michael Keesey <[EMAIL PROTECTED]> wrote: In a test where I ran a calculation a million times, shift right was about 200ms faster than division. Sorry, that's not a helpful metric. I should have said shift right took ~90% as much time. -- Mike Keesey ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
On 3/2/07, Karina Steffens <[EMAIL PROTECTED]> wrote: If your mc's reg point is top left: mc._x = _root.xmouse - mc._width/2 mc._y = _root.ymouse - mc._height/2 Incidentally, there's a neat trick you can do to speed up the calculation AND ensure that the result is an integer (so that the clip is aligned to the pixel). It's called "bitwise shift right": mc._x = _root.xmouse - (mc._width >> 1); mc._y = _root.ymouse - (mc._height >> 1); The benefit in speed is probably negligible in this case. In a test where I ran a calculation a million times, shift right was about 200ms faster than division. (I wonder if the difference might be greater in AS3, though) However, if you also have to constrain to an integer (e.g., using Math.floor()), then shift right is over twice as fast as using Math.floor and division. Basically, whenever multiplying or dividing by a power of 2, you can use shift left (for multiplication) or shift right (for division) and get a faster result that is automatically constrained to an integer. x >> 1 is equivalent to Math.floor(x / 2) x >> 2 is equivalent to Math.floor(x / 4) x >> 3 is equivalent to Math.floor(x / 8) x >> 4 is equivalent to Math.floor(x / 16) x << 1 is equivalent to Math.floor(x * 2) x << 2 is equivalent to Math.floor(x * 4) x << 3 is equivalent to Math.floor(x * 8) x << 4 is equivalent to Math.floor(x * 16) You get the idea -- T. Michael Keesey Director of Technology Exopolis, Inc. 2894 Rowena Avenue Ste. B Los Angeles, California 90039 -- The Dinosauricon: http://dino.lm.com Parry & Carney: http://parryandcarney.com ISPN Forum: http://www.phylonames.org/forum/ ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
MovieClip._width / 2 = its _x center MovieClip._height / 2 = its _y center hope it helps [p e r c e p t i c o n] wrote: good people, how do i move a moviClip to center itself at (_xmouse, _ymouse)...i have the onPress part down...i just need to center it on those coordinates thanks ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
dont forget updateAfterEvent(); with the MouseMove use. it tells the player to refresh visuals after the calculated mouse move event you catched even if it wasn't time to render that frame. On 3/2/07, Yehia Shouman <[EMAIL PROTECTED]> wrote: 1) either double click your clip and group everthing and center it manually OR 2) make sure your graphics inside that clip is at 0,0 and then inside your MouseMove handler or onEnterFrame handler; toCenterClip._x = _xmouse - (toCenterClip._width/2); toCenterClip._y = _ymouse - (toCenterClip._height/2); Yehia On 3/2/07, [p e r c e p t i c o n] <[EMAIL PROTECTED]> wrote: > > good people, > > how do i move a moviClip to center itself at (_xmouse, _ymouse)...i have > the > onPress part down...i just need to center it on those coordinates > > thanks > ___ > Flashcoders@chattyfig.figleaf.com > To change your subscription options or search the archive: > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > Brought to you by Fig Leaf Software > Premier Authorized Adobe Consulting and Training > http://www.figleaf.com > http://training.figleaf.com > ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
1) either double click your clip and group everthing and center it manually OR 2) make sure your graphics inside that clip is at 0,0 and then inside your MouseMove handler or onEnterFrame handler; toCenterClip._x = _xmouse - (toCenterClip._width/2); toCenterClip._y = _ymouse - (toCenterClip._height/2); Yehia On 3/2/07, [p e r c e p t i c o n] <[EMAIL PROTECTED]> wrote: good people, how do i move a moviClip to center itself at (_xmouse, _ymouse)...i have the onPress part down...i just need to center it on those coordinates thanks ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] simple math question...
Try: // movie_mc is the instance name of the movieClip // you want to center on the mouse coords. movie_mc._x = _xmouse - (movie_mc._width/2); movie_mc._y = _ymouse - (movie_mc._height/2); If the movieClip size doesn't change you can optimize this by precalculating the (movie_mc._width/2) and (movie_mc._height/2) parts so you aren't constantly doing it. -- JOR [p e r c e p t i c o n] wrote: good people, how do i move a moviClip to center itself at (_xmouse, _ymouse)...i have the onPress part down...i just need to center it on those coordinates thanks ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
RE: [Flashcoders] simple math question...
If your mc's reg point is top left: mc._x = _root.xmouse - mc._width/2 mc._y = _root.ymouse - mc._height/2 if it's centered you need not bother about the width/2 etc, but if it's somewhere else, you'll need to change it or do other calcualtions. Karina > -Original Message- > From: [p e r c e p t i c o n] [mailto:[EMAIL PROTECTED] > Sent: 01 March 2007 23:57 > To: flashcoders > Subject: [Flashcoders] simple math question... > > good people, > > how do i move a moviClip to center itself at (_xmouse, > _ymouse)...i have the onPress part down...i just need to > center it on those coordinates > > thanks > ___ > Flashcoders@chattyfig.figleaf.com > To change your subscription options or search the archive: > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > Brought to you by Fig Leaf Software > Premier Authorized Adobe Consulting and Training > http://www.figleaf.com http://training.figleaf.com > ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
