因此，如果在SVG输出中显示原有的WKT坐标，那么所有几何图形就会颠倒。
Thus, if the WKT coordinates are shown unchanged in the SVG output, all geometries would be upside down.
这些类允许各种几何图形建立在双精度或浮点精度的坐标系上。
These classes allow the various geometric shapes to be constructed with coordinates of either double or float precision.
矢量数据包含由 x 和 y 坐标，经常还有 z（立面）坐标所定义的几何图形。
Vector data contains geometric shapes defined by x and y coordinates, and frequently z (elevation) coordinates.
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