public void handleConnect(Figure start, Figure end) {
PertFigure source = (PertFigure) start;
PertFigure target = (PertFigure) end;
if (source.hasCycle(target)) {
setAttribute(FigureAttributeConstant.FRAME_COLOR, Color.red);
} else {
target.addPreTask(source);
source.addPostTask(target);
source.notifyPostTasks();
}
}
