How to set and read pixels? AffineTransform?

I understand how the AffineTransform class works but I don't see a way to set the color of and read the color of individual pixels in my JPanel. Any help will be apppreciated.

you can't do that with AffineTransform. AffineTransform let's you translate/rotate/shear/scale before rendering, but you don't have access to pixel values.
Try instead creating an empty bufferedimage, draw into it whatever you want and then you have access to the pixel values via bufferedImage.getRGB()/setRGB().
or you get more basic and manipulate the WriteableRaster of your image directly.

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