To set the arrow that shows the direction in which the column is sorted, the setSortDirection(int direction) method of the Tree class is called (lines 36 to 37).

要设置显示列的排序方向的箭头，可以调用 Tree 类的 setSortDirection(int direction) 方法（第 36、37 行）。

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Results: the method could determine the anomaly boundary lines around it and show the stretch along anomaly direction.

结果：该方法可以较准确的确定异常体的上下左右边界以及异常体在垂直测线方向上的延伸情况。

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A new method is proposed according to the pixels gradient direction and the lines local property.

根据像素点的梯度方向和直线局部特性提出了一种新的亚像素直线特征检测方法。

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