Draw2d 学习笔记四 XYLayout
XYLayout就是采用绝对坐标来确定子figure的位置和大小。
/**
?* Calculates and returns the preferred size of the input figure. Since in XYLayout the
?* location of the child should be preserved, the preferred size would be a region which
?* would hold all the children of the input figure. If no constraint is set, that child
?* is ignored for calculation. If width and height are not positive, the preferred
?* dimensions of the child are taken.
?*/
所以用户至少要指定figure的位置，然后指定大小为负值，系统就会把用preferred size。
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