java – 在jPanel周围拖动/移动形状

第一个问题解决了.但我在移动形状方面遇到了一些麻烦.是否有任何特定的转换来移动jPanel周围的形状？

我有这个代码：

public boolean drag(MouseEvent e) {
    if(points.isEmpty()) //if point's vector is empty
        return false;

    if(!selected)
        return false;

    int x = e.getX(),y = e.getX();

    if (!dragging)
        lastMovePoint.setLocation(x,y);

    dragging = true;

    int deslocX = 0;
    int deslocY = 0;

    int oldX = -1;
    int oldY = -1;

    int size = points.size();
    for(int i = 0; i < size; i++) {
        oldX = lastMovePoint.x;
        oldY = lastMovePoint.y;

        deslocX = x - oldX;
        deslocY = y - oldY;

        points.set(i,new Point(points.get(i).x + deslocX,points.get(i).y + deslocY));
//set the vector of points so that when there is a repaint() it repaints the shape with the new
//coordinates


    }
     lastMovePoint.setLocation(x,y); //set the location of the old point
    return true;
}

此方法由侦听器mouseDragged调用,并在成功时返回true.我想要做的是添加前一个拖拽点和实际值之间的差异.

当我运行此代码时,我遇到了一个问题：

形状只向右/向左,向上和向下不起作用……

.