[cairo] can cairo give me a draw pen with gradient width

[glorious tao]

Hi, I want to use cairo to draw chinese characters,  but how can I get a
draw pen with gradient width? In a real world, I use bush pen to do some
handwriting,  when I push harder and move faster, the pen width will become
thinner, so I can get beautiful handwriting (like in the attachment). so can
I use cairo to do that, or someone give me some suggestions?
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