A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.
这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。
The input lines of dots and the surface, and calculate the composition of the convex polygon centroid, area, and whether the specified line cross, etc.
说明：根据输入点组成线和面，并计算组成的凸多边形的质心、面积、是否和指定线交叉等。
This produces the cross hatching effect of thick grid lines where the surface would otherwise shade darkly, and thin grid lines where the surface would shade brightly.
这产生了粗格线的交叉阴影效果，除非表面是被着成暗色的，在明亮的被着色表面上显示为细的格线。
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