Node types are double angle-bracketed.
节点类型用双层尖括号括起。
The recursion formulae of the node angle displacement are derived in the text and that internal forces of the beam can be solved.
推出了求解结点转角位移的递推公式，进而求得梁的内力。
When the prior neighbor node is empty, widen the Angle of the prior region in order to widen the scope of prior region until find out a satisfied node.
当探测到前向邻居节点为空时，扩大前向区域的角度，以此来扩大前向区域的范围，直到找到一个符合要求的节点。
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