public byte[] getTileImageData(int x, int y, int zoom) {
mStream.reset();
Matrix matrix = new Matrix(mBaseMatrix);
float scale = (float) (Math.pow(2, zoom) * mScale);
matrix.postScale(scale, scale);
matrix.postTranslate(-x * mDimension, -y * mDimension);
mBitmap.eraseColor(Color.TRANSPARENT);
Canvas c = new Canvas(mBitmap);
c.setMatrix(matrix);
// NOTE: Picture is not thread-safe.
synchronized (mSvgPicture) {
mSvgPicture.draw(c);
}
BufferedOutputStream stream = new BufferedOutputStream(mStream);
mBitmap.compress(Bitmap.CompressFormat.PNG, 0, stream);
try {
stream.close();
} catch (IOException e) {
Log.e(TAG, "Error while closing tile byte stream.");
e.printStackTrace();
}
return mStream.toByteArray();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.drawPicture(mPicture);
canvas.drawPicture(mPicture, new RectF(0, 100, getWidth(), 200));
mDrawable.setBounds(0, 200, getWidth(), 300);
mDrawable.draw(canvas);
ByteArrayOutputStream os = new ByteArrayOutputStream();
mPicture.writeToStream(os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
canvas.translate(0, 300);
canvas.drawPicture(Picture.createFromStream(is));
}