Draggable rectangles in Java 2D [duplicate]

Solution 1:

JHotDraw was designed as "a Java GUI framework for technical and structured Graphics." The linked JHotDraw Pattern Language: JHotDraw Domain Overview illustrates how to customize drawing editors. The sample org.jhotdraw.samples.draw.Main is a reasonable starting point, and JModeller is a simple UML editor built using the framework.

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