SE450: Framework Classes [40/63]

• Framework programmer implements Node/Edge interfaces
• draw draws node/edge
• getBounds returns enclosing rectangle (to compute total graph size for scrolling)
• Edge.getStart, getEnd yield start/end nodes
• Node.getConnectionPoint computes attachment point on shape boundary
• Edge.getConnectionPoints yields start/end coordinates (for grabbers)
• clone overridden to be public