有一个Area类的图型，怎样实现他能随着鼠标拖动移动？

Question

本帖最后由 xautswfc 于 2010-08-26 11:12:35 编辑

Answer 1

Point lastPoint;
addMouseListener(new MouseAdapter(){
    @Override public mousePressed(MouseEvent e){
        if(area.contains(e.getPoint()){
            lastPoint = e.getPoint();
        }else{
            lastPoint = null;
        }
    }
};
addMouseMotionListener(new MouseMotionAdapter(){
    @Override public void mouseDragged(MouseEvent e){
        if(lastPoint == null) return;
        Point current = e.getPoint();
        double dx = current.getX() - lastPoint.getX();
        double dy = current.getY() - lastPoint.getY();
        AffineTransform transform = AffineTransform.getTranslateInstance(dx,dy);
        area.transform(transform);
        lastPoint = current;
        repaint();
    }
}
仅作参考。