java jbutton image png clickable area

I want to do a JButton with PNG icon but the clickable area have to be a pixel and not a transparency pixel, and position this JButton over oth开发者_开发知识库er JButtons like position absolute in css.

thanks in advance

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Create a JLabel with the imge and add a MouseListener. In the listener check Point of the MouseEvent. Get pixel from the image for the point and check alpha of the image's point color. If it's not transparent do your action.