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Objective-c - What is the role of CGContextSetTextMatrix in CoreGraphics?

CGContextSetTextMatrix(context, CGAffineTransformIdentity);

What is the specific function of this sentence? I searched a lot on the Internet and most of them said "Set the glyph transformation matrix to CGAffineTransformIdentity, which means that each glyph does not undergo graphics transformation"? ? ?

The explanation is so abstract, is there any way to explain it more vividly?

过去多啦不再A梦过去多啦不再A梦2871 days ago814

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