On parsing SVG Path String

wodeni / Animate-plus-plus

Animate your vector graphics using C++ :zap:

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Open wodeni opened 6 years ago

wodeni commented 6 years ago

A JS example that uses regex: https://github.com/chebfun/chebfun/issues/1617
PEGTL is confusing to use and might be an overkill
There's no good light-weight parser library, as far as I know.
<regex> might be the way to go, but it requires nontrivial engineering effort.

wodeni commented 6 years ago

I ended up using <boost/regex.hpp> because it support lookbehind matching There is a bug that I cannot fix yet:

boost does NOT support variable length patterns. Therefore, I could not split the numbers such as this one: 9E5.5 (which is 9E5 and .5) . I know this sucks, but I suspect that this pathological case will not come up a lot. If so, maybe we can preprocess the SVG again.

wodeni commented 6 years ago

Done in shapes as of 04/20. Closing for now.

wodeni commented 6 years ago

To show off some results:

The source is here. Parsing is lightning fast ⚡️

wodeni commented 6 years ago

Just for fun, some more animals. This time is a polygon-based one: