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AndrewYuCWA1987
AndrewYuCWA1987
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getBounds() method on DisplayObjects with filters

Apr 26, 2012 10:58 PM

Hi everyone.

    I got trouble when I was trying to call getBounds() on a MovieClip with filter on it, This asset is made in Flash CS and is a flame shaped movie clip with several filters on each frame. when I call mc.getBounds(null) on this movieClip, the result rectangle I got is smaller than it should be, excluding outer glow filter's effect, (like getRect() method does), so my quesion is, can I use getBounds() method to get the boundary including filters, how? if not, any way else I can do this? Thank you in advance!

437 Views   5 Replies   Latest reply: AndrewYuCWA1987, Apr 27, 2012 5:33 AM
 
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  • _spoboyle
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    1. _spoboyle,
    Apr 27, 2012 1:26 AM   in reply to AndrewYuCWA1987
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    not a particularly elegate solution but this give you want you need

     

     

    var sprite:Sprite = new Sprite();
sprite.graphics.beginFill(0xff0000);
sprite.graphics.drawRect(0, 0, 20, 20);
sprite.graphics.endFill();
 
 
var blurFilter:BlurFilter = new BlurFilter();
sprite.filters = [blurFilter];
addChild(sprite);
 
 
trace("sprite dim: ", sprite.getBounds(null));
 
 
var bmd:BitmapData = new BitmapData(sprite.width, sprite.height, true, 0);
trace("filter dim: " + bmd.generateFilterRect(sprite.getBounds(null), blurFilter));
 
     
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  • AndrewYuCWA1987
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    2. AndrewYuCWA1987,
    Apr 27, 2012 2:58 AM   in reply to _spoboyle
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    Thank you.

        Help answer. So can I say: getBounds() method DOES exclude filter affects?

        But what if those filters are built inside Flash CS resource, and I get no way to access the filters designers are applying.

     
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  • _spoboyle
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    3. _spoboyle,
    Apr 27, 2012 3:03 AM   in reply to AndrewYuCWA1987
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    yes getBounds does exclude the filter effects

     

    you can get the filters by looping over the displayObjects.filters property, however without playing arround I wouldn't know how to handle this if there where several filters applied

     
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  • _spoboyle
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    4. _spoboyle,
    Apr 27, 2012 3:16 AM   in reply to _spoboyle
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    i found this which might help

     

    http://www.refactored.fr/?p=163

     
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  • AndrewYuCWA1987
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    5. AndrewYuCWA1987,
    Apr 27, 2012 5:33 AM   in reply to _spoboyle
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    Thank you very much.

    For most cases, this article provides the method we need to get the correct boundary for clips with filter(s), that is great.

    But in my case, I may not choose to do like this, because it sacrifice too much performance when the clip is nested, with children clips with or without filters, and filters on its own. Yes, sure I can calculate the actural boundary recursively(loop over all children and mark the max(min) value of the boundary), I still have serveral plans, do a little trick in Flash CS. But I will still seek for more effective way to solve this.

     

    Thank you again, _spoboyle. realy helpful.

     
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