About the x skew factor of applyTransform function.
Does it equal to the angle I need? or what ? But I find the result is wrong if I input the angle value directly.

For example, if I want to let it skew 60°, what is the value of x/y skew factor?

The skewing uses an angle. But that only is what you expect for 10–20°. With bigger angles, it behaves strange. That is not a bug, just how the math for skewing works.

I found 2 questions:
1.The x skew factor value is 1.0, but it changed so big if it’s angle.I think the result is wrong.
2.The x skew and y skew factor is reversed.