Java：计算2D平面上两点之间的方位

Question

我正在使用此代码查找两个Point对象之间的角度：

private float getAngle(Point targetPoint, Point centerPoint){
    // north = 90; south = 270; west = 180; east = 0; 
    // but in my method west = 0 and east = 180
    double theta = Math.atan2(targetPoint.y - centerPoint.y, targetPoint.x - centerPoint.x);
    float angle = (float) Math.toDegrees(theta);

    if(angle < 0){
        angle += 360;
    }
    return angle;
}

其中centerPoint是：[160,160]
和targetPoints是：
1 - [x = 160，y = 80]，2- [x = 80，y = 160]，3 - [x = 240，y = 160]，4 - [x = 160，y = 240]。

我认为1应该是90°，2 - 180°，3 - 0°和4 - 270°

但是我得到了这个：

angle between robLoc java.awt.Point[x=160,y=160] and p java.awt.Point[x=160,y=80] is 90.0
angle between robLoc java.awt.Point[x=160,y=160] and p java.awt.Point[x=80,y=160] is 0.0
angle between robLoc java.awt.Point[x=160,y=160] and p java.awt.Point[x=240,y=160] is 180.0
angle between robLoc java.awt.Point[x=160,y=160] and p java.awt.Point[x=160,y=240] is 270.0

如何调整计算方法以获得： 2 - 0°和3 - 180°？

就像这张照片：