I' m thinking the simplest way to convert my iphone app to run on the iphone and ipad is to create higher resolution images (good enough for the ipad) and then scale them as required to use window sizes as follows
iphone: 320x480 pixels (no landscape)
ipad portrait: 682x1024 pixels (centered)
ipad landscape: 512x768 pixels (centered)
(all 2:3 aspect ratios)
I've never used anything but the default full screen window size up until now. How do I create the above size windows, and automatically change the window size as the ipad is rotated from portrait to landscape?