Hey folks,
While it would still be extremely useful to be able to access the BitmapData
of a GroundOverlay layer directly, but here's a (somewhat hacky) solution I
found. I access the transformation the Google Maps library calculates for a
bitmap of the proper size through the 'concatenatedMatrix' property, and
then create a clipped bitmap and position it in the component (of the size
of my original bitmap). It's not a great solution -- you need to watch for
events that change the zoom or pan and update your component -- but it
works. You could probably use a similar strategy if you were struggling
with the initial size of your bitmap, as well.
Here's a code snippit for inspiration in case anyone hits this problem in
the future:
public function cropBitmapToViewport():void {
var contentBitmapData:BitmapData =
this.getContentBitmapData(originalBitmap.bitmapData,
this.currentSliderValue);
var matrix:Matrix = this.transform.concatenatedMatrix;
var xshift:Number = matrix.tx;
var yshift:Number = matrix.ty;
var xscale:Number = matrix.a;
var yscale:Number = matrix.d;
// What width and height does our cropped bitmap need to be to cover the
viewport, plus a buffer area?
var pixelWidth:Number = (MAX_MAP_WIDTH + BUFFER*2) / xscale;
var pixelHeight:Number = (MAX_MAP_HEIGHT + BUFFER*2) / yscale;
// If we don't need to crop the bitmap, we don't.
if ( isScaledBitmapSafe() ) {
this.bitmap.x = 0;
this.bitmap.y = 0;
this.bitmap.bitmapData = contentBitmapData;
return;
}
var croppedBitmapData:BitmapData = new
BitmapData(pixelWidth,pixelHeight,true);
this.bitmap.bitmapData = croppedBitmapData;
// Set x and y of our cropped bitmap to match the original
this.bitmap.x = Math.floor((0 - xshift) / xscale) - (BUFFER / xscale) ;
this.bitmap.y = Math.floor((0 - yshift) / yscale) - (BUFFER / xscale);
// Copy the content from the origianal bitmap
bitmap.bitmapData.copyPixels(
contentBitmapData,
new Rectangle(bitmap.x, bitmap.y, pixelWidth, pixelHeight), new Point(0,0)
);
}
--j
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