root/as3/gunyarapaint/trunk/colorpicker/src/org/sepy/geom/Matrix2d.as

package org.sepy.geom
{
        public class Matrix2d extends Array2d
        {
                private var _identity:Array;
                
                public function Matrix2d(w:uint, h:uint)
                {
                        super(w, h);
                        
                        _identity = null;
                }
                
                public function get IDENTITY():Array
                {
                        if(_identity == null)
                        {
                                _identity = new Array(_w * _h);
                                for(var y:uint = 0; y < _h; ++y)
                                        for(var x:uint = 0; x < _w; ++x)
                                                _identity[(y * _w) + x] = (x == y) ? 1 : 0;
                        }
                        
                        return _identity;
                }
                
                protected override function setFlatData(new_data:Array, copy:Boolean=false):void
                {
                        // Fix the matrix to the given bounds
                        if(new_data.length < length)
                                new_data = new_data.slice(0, new_data.length).concat(IDENTITY.slice(new_data.length, length));
                        else if(new_data.length > length)
                                new_data = new_data.slice(0, length);
                        
                        super.setFlatData(new_data, copy);
                }
        }
}