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.
您可以为点和线定义您自己的类，以便您可以提供双精度值而非整数值的参数以及z -轴。
You define your own classes for point and line so that you can provide all arguments as double values instead of integers and so that you can provide a z-axis.
Blitz的Unifor m类提供返回在0,1间的双精度数的成员函数。
Blitz's Uniform class provides a member function that returns a double in 0, 1.
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