[away3d] Scaling a large bitmap to 300x200 mesh

[JamesK]

I'm trying to scale a large bitmap to a 300*200 mesh. The problem is
the bitmap seems to end up a little larger than the intended area. Can
anybody spot why?

Here's the code:

                        var loadedBitmap:Bitmap =
a_e.currentTarget.content as Bitmap;
                        loadedBitmap.smoothing = true;

                        WIDTH = 300;
                        HEIGHT = 200;

                        var planeScale : Number = WIDTH / HEIGHT;
                        var artScale : Number = loadedBitmap.width / 
loadedBitmap.height;

                        var holderWidth : int;
                        var holderHeight : int;

                        if ( artScale > planeScale )
                        {
                                holderWidth = loadedBitmap.width;
                                holderHeight = loadedBitmap.width / planeScale;
                        }
                        else
                        {
                                holderHeight = loadedBitmap.height;
                                holderWidth = loadedBitmap.height * planeScale;
                        }

                        var planeBitmapData : BitmapData = new BitmapData( 
holderWidth,
holderHeight, true, 0xFF );

                        var targetRect : Rectangle = new Rectangle( 0, 0,
loadedBitmap.width, loadedBitmap.height );
                        var startX : int = ( planeBitmapData.width - 
loadedBitmap.width ) /
2;
                        var startY : int = ( planeBitmapData.height -
loadedBitmap.height ) / 2;

                        var startPoint : Point = new Point( startX, startY );
                        planeBitmapData.copyPixels( loadedBitmap.bitmapData, 
targetRect,
startPoint );

                        var artMaterial:BitmapMaterial =
                         new BitmapMaterial(planeBitmapData, {smooth:true, 
debug:false});

                        for ( var i : int = _shape.faces.length-1; i >= 0; i-- )
                        {
                                var currentFace : Face = _shape.faces[i];
                                currentFace.material = artMaterial;
                        }