How to define graphics borders on JPanel?

Question

Java

The swing library is used.
A horizontal JSplitPane is created in the frame . Added JScrollPane to
the left and right sides . Added to the left JScrollPane, for example, a 2000x1500px image (the left side is not important). The scroll for the image is perfectly calculated by itself. A JPanel element has been added to the right JScrollPane . Some kind of graphics will be added on this JPanel . Frame sizes are fixed . I need to define the outermost borders of the JPanel , which is on the right side, to set the scroll area for the JScrollPane .


How can this be done other than defining these points each time a new graphic element is added?