A-Star Weight
A-Star searches the superior route with lest cost from a beginning node to the target node. The calculation will be conduced by tree structure formed by distance and cost to determine the searching order. The heavier the weight is, the searching range will be smaller and closer to the area of straight line consisting of the two points, which makes quick calculation and result. However, reducing the searching range might miss the better routes and results in higher cost result. The default is 0.
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