For a more detailed discussion of matrices and transformations, see Coordinate Systems and Transformations.
有关矩阵和变换的更详细的讨论，请参见 坐标系统和变形。
Additional transformations can be performed, and these are applied to the current set of matrices defined by the previous operations.
我们还可以定义额外的转换，并将它们应用到由之前操作所定义的当前矩阵集中。
As these functions use stack semantics, you can layer transformations for shapes and later remove them to restore the original matrices.
由于这些函数都使用堆栈语法，所以您可以对形状应用层次转换，并在后面将它们删除，以恢复原有矩阵。
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