Identity#
Identity 是一个 Matrix，它不执行任何操作——用于需要矩阵的语法，但不进行实际变换的情况。其形式为 pymupdf.Matrix(1, 0, 0, 1, 0, 0)。
Identity 是一个常量，一个“不可变”对象。因此，所有矩阵属性都是只读的，并且其方法被禁用。
如果你需要一个 可变 的单位矩阵作为起始点，可以使用以下语句之一:
>>> m = pymupdf.Matrix(1, 0, 0, 1, 0, 0) # 指定数值
>>> m = pymupdf.Matrix(1, 1) # 使用因子为1的缩放
>>> m = pymupdf.Matrix(0) # 使用零度的旋转
>>> m = pymupdf.Matrix(pymupdf.Identity) # 复制 Identity
Identity is a Matrix that performs no action – to be used whenever the syntax requires a matrix, but no actual transformation should take place. It has the form pymupdf.Matrix(1, 0, 0, 1, 0, 0).
Identity is a constant, an “immutable” object. So, all of its matrix properties are read-only and its methods are disabled.
If you need a mutable identity matrix as a starting point, use one of the following statements:
>>> m = pymupdf.Matrix(1, 0, 0, 1, 0, 0) # specify the values
>>> m = pymupdf.Matrix(1, 1) # use scaling by factor 1
>>> m = pymupdf.Matrix(0) # use rotation by zero degrees
>>> m = pymupdf.Matrix(pymupdf.Identity) # make a copy of Identity