Common Lisp/External libraries/Vecto

Vecto is a library for producing graphics programmatically, in PNG format, and typically on the fly. It is a simplified interface to CL-VECTORS, a vector rasterization library. It is very portable and should work in any Common Lisp environment. This kind of program could be used to trivially create a captcha generator or mathematical function plotter like Gnuplot or even more complicated visualization.

Further Reading

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Other Graphics Libraries

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Vecto is certainly not the only library for this purpose. You might also want to check out: