How 9patchimage works

Question

Hi, I am working with android's 9 patch image emulator to create 9 patch image..

Can anyone tell me how it actually works? On what basis it Scale the image? What are the parameters it considers to stretch image?

Thanks

Answer 1

Here are great paragraphs about 9 patch drawables http://developer.android.com/intl/zh-TW/guide/topics/graphics/2d-graphics.html#nine-patch