So, you want to get an idea of how to create the balloon so that it can resize...
Well, given a texture image of a balloon at its smallest size, divided into three-by-three sections-- the middle sections need to stretch, while the corners are kept their original size.
Here are a couple of useful code references...
http://www.blitzbasic.com/codearcs/codearcs.php?code=331
http://www.blitzbasic.com/codearcs/codearcs.php?code=529
Well, given a texture image of a balloon at its smallest size, divided into three-by-three sections-- the middle sections need to stretch, while the corners are kept their original size.
Here are a couple of useful code references...
http://www.blitzbasic.com/codearcs/codearcs.php?code=331
http://www.blitzbasic.com/codearcs/codearcs.php?code=529