重点研究了实现线状符号及面状符号的快速算法：画线算法是实现线状符号的理论基础。
In this paper, the author goes deep into the character and composition rule of point, line and area symbols, and the definition of Map symbol Base is brought forward.
重点研究了实现线状符号及面状符号的快速算法：画线算法是实现线状符号的理论基础。
In this paper, the author goes deep into the character and composition rule of point, line and area symbols, and the definition of Map symbol Base is brought forward.
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