New to Java

Hi all,

I was hoping that somebody may be able to help me in an algorithm for shading a rectangle where there is black at the centre, gradually getting lighter as pixels nearer the edge. I appreciate that to shade a rectangle without using fillRect is simply using nested for loops but the only logic I have used thus far is simply with a fixed colour for each pixel.

Would anybody be willing to share an algorithm (unfortunately not able to use 3D)?

Thanks in advance,

Chris