Question

I am very new to Java Swing, and I am working on an assignment. I have some polygons on my component. When I entered in to a polygon it has to highlight (i.e. filled with some color).

When I go to next polygon it has to highlight and previous one should be erased (i.e normal state). I found some examples but those are using “mousepressed” events, but mine is different.

Answer 1

Have you gone through the MouseListener/MouseMotionListener sections of the Swing tutorials? If not, and if you have nothing written yet, I suggest that you review the tutorials and look at using the MouseMotionListener. You don’t want to listen for mouseEntered but more likely mouseMoved. A pseudocode example could be:

in MouseMotionListener or MouseAdapter
   mouseMoved method
      get position of mouse pointer via the MouseEvent parameter.
      For loop through list of Polygons 
         If mouse inside of polygon, highlight it.
         Else, un-highlight it.
      End for loop
   End of mouseMoved method.
end MouseMotionListener or MouseAdapter